US20070041457A1 - Method and apparatus for providing antenna diversity in a wireless communication system - Google Patents

Method and apparatus for providing antenna diversity in a wireless communication system Download PDF

Info

Publication number
US20070041457A1
US20070041457A1 US11261823 US26182305A US2007041457A1 US 20070041457 A1 US20070041457 A1 US 20070041457A1 US 11261823 US11261823 US 11261823 US 26182305 A US26182305 A US 26182305A US 2007041457 A1 US2007041457 A1 US 2007041457A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
antennas
virtual
transmit
symbols
subcarrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11261823
Inventor
Tamer Kadous
Aamod Khadekar
Dhananjay Gore
Alexei Gorokhov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608Antenna selection according to transmission parameters
    • H04B7/061Antenna selection according to transmission parameters using feedback from receiving side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure

Abstract

Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g., based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

Description

  • [0001]
    The present application claims priority to provisional U.S. Application Ser. No. 60/710.408, entitled “Method and Apparatus for Antenna Diversity in Multi-input Multi-Output Communication Systems,” filed Aug. 22, 2005, and provisional U.S. Application Ser. No. 60/711,144 entitled “Method and Apparatus for Antenna Diversity in Multi-input Multi-Output Communication Systems,” filed Aug. 24, 2005, both assigned to the assignee hereof and incorporated herein by reference. The present application is further related to commonly assigned U.S. patent application Ser. No. to be determined, entitled “Adaptive Sectorization in Cellular Systems,” filed on the same day herewith, and incorporated herein by reference.
  • BACKGROUND
  • [0002]
    I. Field
  • [0003]
    The present disclosure relates generally to communication, and more specifically to transmission schemes for wireless communication.
  • [0004]
    II. Background
  • [0005]
    In a wireless communication system, a transmitter (e.g., a base station or a terminal) may utilize multiple (T) transmit antennas for data transmission to a receiver equipped with one or more (R) receive antennas. The multiple transmit antennas may be used to increase system throughput by transmitting different data from these antennas and/or to improve reliability by transmitting data redundantly. For example, the transmitter may transmit a given symbol from all T transmit antennas, and the receiver may receive multiple versions of this symbol via the R receive antennas. These multiple versions of the transmitted symbol generally improve the receiver's ability to recover the symbol.
  • [0006]
    Transmission performance may be improved by exploiting the spatial dimension obtained with the multiple transmit antennas and, if present, the multiple receive antennas. A propagation path exists between each pair of transmit and receive antennas. T·R different propagation paths are formed between the T transmit antennas and the R receive antennas. These propagation paths may experience different channel conditions (e.g., different fading, multipath, and interference effects) and may achieve different signal-to-noise-and-interference ratios (SNRs). The channel responses for the T·R propagation paths may vary from path to path and may further vary across frequency for a dispersive wireless channel and/or over time for a time-variant wireless channel.
  • [0007]
    A major drawback to using multiple transmit antennas for data transmission is that the channel response between each pair of transmit and receive antennas (or each propagation path) typically needs to be estimated in order to properly receive the data transmission. Estimation of the fall channel response for all T·R transmit and receive antenna pairs may be undesirable for several reasons. First, a large amount of link resources may be consumed in order to transmit a pilot used for channel estimation, which in turn reduces the link resources available to transmit data. Second, channel estimation for all T·R transmit and receive antenna pairs increases processing overhead at the receiver.
  • [0008]
    There is therefore a need in the art for transmission schemes that can ameliorate the need to estimate the fall channel response for all transmit and receive antenna pairs.
  • SUMMARY
  • [0009]
    Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described herein. The spatial multiplexing order determines the number of symbols to send simultaneously on one subcarrier in one symbol period, the spatial diversity order determines the amount of spatial diversity observed by the transmitted symbols, and the channel estimation overhead order determines the amount of pilot overhead.
  • [0010]
    In an embodiment, for a data transmission from a transmitter to a receiver, the subcarriers assigned to the receiver and the spatial multiplexing order (M) for the receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. The M virtual antennas for each assigned subcarrier may be selected in various manners, as described below. Output symbols for the receiver are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped output symbols and pilot symbols (or transmit symbols) are provided for transmission from T physical transmit antennas, where T≧V. Transmission symbols (e.g., OFDM symbols or SC-FDMA symbols) are generated for each transmit antenna based on the transmit symbols for that transmit antenna. Different cyclic delays may be applied to the transmission symbols for the T transmit antennas.
  • [0011]
    Various aspects and embodiments of the invention are described in further detail below.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0012]
    The features and nature of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout.
  • [0013]
    FIG. 1 shows a wireless communication system.
  • [0014]
    FIGS. 2A and 2B show MISO and MIMO channels, respectively.
  • [0015]
    FIG. 3 shows a transmission scheme with virtual antennas.
  • [0016]
    FIG. 4 shows a transmission scheme with virtual antennas and cyclic delay diversity.
  • [0017]
    FIG. 5 shows a MIMO transmission by cycling through the virtual antennas.
  • [0018]
    FIGS. 6A, 6B and 6C show three exemplary subcarrier structures.
  • [0019]
    FIG. 7 shows an exemplary frequency hopping scheme.
  • [0020]
    FIG. 8 shows an exemplary pilot scheme for symbol rate hopping.
  • [0021]
    FIG. 9A through 9D show four exemplary pilot schemes for block hopping.
  • [0022]
    FIG. 10 shows a process for transmitting data and pilot to one or more receivers.
  • [0023]
    FIG. 11 shows an apparatus for transmitting data and pilot to one or more receivers.
  • [0024]
    FIG. 12 shows a block diagram of a base station and two terminals.
  • DETAILED DESCRIPTION
  • [0025]
    The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments or designs.
  • [0026]
    FIG. 1 shows a wireless communication system 100 with multiple base stations 110 and multiple terminals 120. A base station is a station that communicates with the terminals. A base station may also be called, and may contain some or all of the functionality of, an access point, a Node B, and/or some other network entity. Each base station 110 provides communication coverage for a particular geographic area 102. The term “cell” can refer to a base station and/or its coverage area depending on the context in which the term is used. To improve system capacity, a base station coverage area may be partitioned into multiple smaller areas, e.g., three smaller areas 104 a, 104 b, and 104 c. Each smaller area is served by a respective base transceiver subsystem (BTS). The term “sector” can refer to a BTS and/or its coverage area depending on the context in which the term is used. For a sectorized cell, the BTSs for all sectors of that cell are typically co-located within the base station for the cell. The transmission techniques described herein may be used for a system with sectorized cells as well as a system with un-sectorized cells. For example, the techniques may be used for the system described in the aforementioned U.S. patent application Ser. No. [Attorney Docket No. 05091]. For simplicity, in the following description, the term “base station” is used generically for a BTS that serves a sector as well as a base station that serves a cell.
  • [0027]
    Terminals 120 are typically dispersed throughout the system, and each terminal may be fixed or mobile. A terminal may also be called, and may contain some or all of the functionality of, a mobile station, a user equipment, and/or some other device. A terminal may be a wireless device, a cellular phone, a personal digital assistant (PDA), a wireless modem card, and so on. Each terminal may communicate with zero, one, or multiple base stations on the downlink and uplink at any given moment. The downlink (or forward link) refers to the communication link from the base stations to the terminals, and the uplink (or reverse link) refers to the communication link from the terminals to the base stations.
  • [0028]
    For a centralized architecture, a system controller 130 couples to base stations 110 and provides coordination and control for these base stations. For a distributed architecture, the base stations may communicate with one another as needed.
  • [0029]
    The transmission techniques described herein may be used for various wireless communication systems such as an orthogonal frequency division multiple access (OFDMA) system, a single-carrier frequency division multiple access (SC-FDMA) system, a frequency division multiple access (FDMA) system, a code division multiple access (CDMA) system, a time division multiple access (TDMA) system, a spatial division multiple access (SDMA) system, and so on. An OFDMA system utilizes orthogonal frequency division multiplexing (OFDM), which is a multi-carrier modulation technique that partitions the overall system bandwidth into multiple (K) orthogonal subcarriers. These subcarriers may also be called tones, bins, and so on. With OFDM, each subcarrier is associated with a respective subcarrier that may be modulated with data. An SC-FDMA system may utilize interleaved FDMA (IFDMA) to transmit on subcarriers that are distributed across the system bandwidth, localized FDMA (LFDMA) to transmit on a block of adjacent subcarriers, or enhanced FDMA (EFDMA) to transmit on multiple blocks of adjacent subcarriers. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDMA.
  • [0030]
    An OFDM symbol may be generated for one transmit antenna in one symbol period as follows. N modulation symbols are mapped to N subcarriers used for transmission (or N assigned subcarriers) and zero symbols with signal value of zero are mapped to the remaining K−N subcarriers. A K-point inverse fast Fourier transform (IFFT) or inverse discrete Fourier transform (IDFT) is performed on the K modulation symbols and zero symbols to obtain a sequence of K time-domain samples. The last Q samples of the sequence are copied to the start of the sequence to form an OFDM symbol that contains K+Q samples. The Q copied samples are often called a cyclic prefix or a guard interval, and Q is the cyclic prefix length. The cyclic prefix is used to combat intersymbol interference (ISI) caused by frequency selective fading, which is a frequency response that varies across the system bandwidth.
  • [0031]
    An SC-FDMA symbol may be generated for one transmit antenna in one symbol period as follows. N modulation symbols to be sent on N assigned subcarriers are transformed to the frequency domain with an N-point fast Fourier transform (FFT) or discrete Fourier transform (DFT) to obtain N frequency-domain symbols. These N frequency-domain symbols are mapped to the N assigned subcarriers, and zero symbols are mapped to the remaining K−N subcarriers. A K-point IFFT or IDFT is then performed on the K frequency-domain symbols and zero symbols to obtain a sequence of K time-domain samples. The last Q samples of the sequence are copied to the start of the sequence to form an SC-FDMA symbol that contains K+Q samples.
  • [0032]
    A transmission symbol may be an OFDM symbol or an SC-FDMA symbol. The K+Q samples of a transmission symbol are transmitted in K+Q sample/chip periods. A symbol period is the duration of one transmission symbol and is equal to K+Q sample/chip periods.
  • [0033]
    The transmission techniques described herein may be used for the downlink as well as the uplink. For clarity, much of the following description is for downlink transmission from a base station (a transmitter) to one or more terminals (receivers). For each subcarrier, the base station may transmit to one terminal without SDMA or to multiple terminals with SDMA.
  • [0034]
    FIG. 2A shows a multiple-input single-output (MISO) channel formed by multiple (T) transmit antennas 112 a through 112 t at base station 110 and a single receive antenna 122 x at a terminal 120 x. The MISO channel may be characterized by a 1×T channel response row vector h(k) for each subcarrier k, which may be given as:
    h (k)=[h 1(k) h 2(k) . . . h T(k)],   Eq (1)
    where hi(k), for i=1, . . . , T, denotes the coupling or complex channel gain between transmit antenna i and the single receive antenna for subcarrier k.
  • [0035]
    FIG. 2B shows a multiple-input multiple-output (MIMO) channel formed by the T transmit antennas 112 a through 112 t at base station 110 and multiple (R) receive antennas 122 a through 122 r at a terminal 120 y. The MIMO channel may be characterized by an R×T channel response matrix H(k) for each subcarrier k, which may be given as: H _ ( k ) = [ h 1 , 1 ( k ) h 1 , 2 ( k ) h 1 , T ( k ) h 2 , 1 ( k ) h 2 , 2 ( k ) h 2 , T ( k ) h R , 1 ( k ) h R , 2 ( k ) h R , T ( k ) ] = [ h _ 1 ( k ) h _ 2 ( k ) h _ T ( k ) ] , Eq ( 2 )
    where hj,i (k), for j=1, . . . , R and i=1, . . . , T, denotes the complex channel gain between transmit antenna i and receive antenna j for subcarrier k; and
      • h i (k) is an R×1 channel response vector for transmit antenna i, which is the i-th column of H(k).
  • [0037]
    The transmitter may transmit one or more output symbols from the T transmit antennas on each subcarrier in each symbol period. Each output symbol may be a modulation symbol for OFDM, a frequency-domain symbol for SC-FDMA, or some other complex value. The data transmission may be quantified by the following metrics:
      • Spatial multiplexing order (M)—the number of output symbols transmitted via the T transmit antennas on one subcarrier in one symbol period;
      • Spatial diversity order (D)—the amount of spatial diversity observed by the transmitted output symbols; and
      • Channel estimation overhead order (C)—the number of virtual antennas to be estimated by a receiver for each receive antenna.
        In general, M≦min {T, R}, D≦T, and C≦T. The spatial diversity refers to transmit diversity resulting from the use of multiple transmit antennas and does not include receive diversity resulting from the use of multiple receive antennas.
  • [0041]
    If the transmitter transmits output symbols directly from the T transmit antennas, then a receiver typically needs to estimate the full channel response for all T transmit antennas in order to recover the data transmission. The channel estimation overhead order is then C=T. In certain scenarios, it may be desirable to transmit fewer than T output symbols simultaneously, e.g., if the channel conditions are poor. A subset of the T transmit antennas may be used to transmit fewer than T output symbols. However, this is undesirable since the transmit powers available for the unused transmit antennas are not judiciously employed for transmission.
  • [0042]
    The transmission schemes described herein allow for flexible selection of the three metrics M, D and C in order to achieve good performance for data transmission in different conditions. For example, a larger spatial multiplexing order M may be selected for good channel conditions with high SNRs, and a smaller spatial multiplexing order may be selected for poor channel conditions with low SNRs. A lower channel estimation overhead order C may be selected, e.g., in scenarios where low throughput due to low SNRs does not justify a large channel estimation overhead.
  • [0043]
    The transmission schemes described herein can utilize all T transmit antennas for transmission, regardless of the number of output symbols being sent and regardless of which subcarriers are used for transmission. This capability allows the transmitter to utilize all of the transmit power available for the T transmit antennas, e.g. by utilizing the power amplifiers coupled to each of the antennas, for transmission, which generally improves performance. Employing fewer than T transmit antennas for transmission typically results in less than all of the available transmit power being used for the transmission, which would impact performance.
  • [0044]
    The transmission schemes described herein can readily support MIMO, single-input multiple-output (SIMO), and single-input single-output (SISO) transmissions. A MIMO transmission is a transmission of multiple output symbols from multiple virtual antennas to multiple receive antennas on one subcarrier in one symbol period. A SIMO transmission is a transmission of a single output symbol from one virtual antenna to multiple receive antennas on one subcarrier in one symbol period. A SISO transmission is a transmission of a single output symbol from one virtual antenna to one receive antenna on one subcarrier in one symbol period. The transmitter may also send a combination of MIMO, SIMO and/or SISO transmissions to one or more receivers in one symbol period.
  • [0045]
    The transmitter may transmit M output symbols simultaneously from the T transmit antennas on one subcarrier in one symbol period using various transmission schemes. In an embodiment, the transmitter processes the output symbols for transmission, as follows:
    x(k)=U·P(ks(k) ,   Eq (3)
    where s(k) is an M×1 vector containing M output symbols to be sent on subcarrier k in one symbol period;
      • P(k) is a V×M permutation matrix for subcarrier k;
      • U=[u1 u2 . . . uv] is a T×V orthonormal matrix; and
      • x(k) is a T×1 vector containing T transmit symbols to be sent from the T transmit antennas on subcarrier k in one symbol period. V is the number of virtual antennas formed with the orthonormal matrix U. In general, 1≦M≦V≦T. V may be a fixed value or a configurable value.
  • [0049]
    The orthonormal matrix U is characterized by the property UH·U=I, where “H” He denotes a conjugate transpose and I is the identity matrix. The V columns of U are orthogonal to one another, and each column has unit power. In an embodiment, U is defined such that the sum of the squared magnitude of the V entries in each row is equal to a constant value. This property results in equal transmit power being used for all T transmit antennas. U may also be a unitary matrix that is characterized by the property UH·U=U·UH=I. Orthonormal and unitary matrices may be formed as described below. The V columns of U are used to form V virtual antennas that may be used to send up to V output symbols on one subcarrier in one symbol period. The virtual antennas may also be called effective antennas or by some other terminology.
  • [0050]
    In an embodiment, a single orthonormal matrix U is used for all K total subcarriers in all symbol periods, so that U is not a function of subcarrier index k or symbol index n. In another embodiment, different orthonormal matrices are used for different subcarrier sets that may be assigned to different receivers. In yet another embodiment, different orthonormal matrices are used for different subcarriers. In yet another embodiment, different orthonormal matrices are used for different time intervals, where each time interval may span one or multiple symbol periods. In yet another embodiment, one or more orthonormal matrices are selected for use from among multiple orthonormal matrices, as described below. In general, data and pilot may be transmitted using one or more orthonormal matrices such that a receiver is able to estimate the channel response based on the pilot and use the channel response estimate to recover the data sent to the receiver.
  • [0051]
    The permutation matrix P(k) selects which M virtual antennas to use for subcarrier k from among the V virtual antennas available for use, or which M of the V columns of U. The permutation matrix P(k) may be defined in various manners, and different permutation matrices may be used for different subcarriers, as described below.
  • [0052]
    FIG. 3 shows a model 300 for the transmission scheme given by equation (3). The transmitter receives the data vector s(k) for each subcarrier and symbol period used for transmission. A virtual antenna mapper 310 processes the data vector s(k) and generates the transmit vector x(k). Within virtual antenna mapper 310, a symbol-to-virtual antenna mapping unit 312 multiplies the data vector s(k) with the permutation matrix P(k) and generates a V×1 intermediate vector. A spatial spreading unit 314 multiplies the intermediate vector with the orthonormal matrix U and generates the transmit vector x(k). The transmit vector x(k) is transmitted from the T transmit antennas and via a MIMO channel 350 to R receive antennas at a receiver.
  • [0053]
    The received symbols at the receiver may be expressed as: r _ ( k ) = H _ ( k ) · x _ ( k ) + n _ ( k ) , = H _ ( k ) · U _ · P _ ( k ) · s _ ( k ) + n _ ( k ) , = H _ eff ( k ) · P _ ( k ) · s _ ( k ) + n _ ( k ) , = H _ used ( k ) · s _ ( k ) + n _ ( k ) , Eq ( 4 )
    where r(k) is an R×1 vector containing R received symbols from the R receive antennas on subcarrier k in one symbol period;
      • Heff (k) is an R×V effective channel response matrix for subcarrier k;
      • Hused(k) is an R×M used channel response matrix for subcarrier k; and
      • n(k) is an R×1 noise vector for subcarrier k.
  • [0057]
    The effective and used channel response matrices may be given as: H _ eff ( k ) = H _ ( k ) · U _ , = [ H _ ( k ) · u _ 1 H _ ( k ) · u _ 2 H _ ( k ) · u _ V ] , Eq ( 5 ) and H _ used ( k ) = H _ eff ( k ) · P _ ( k ) , = [ H _ ( k ) · u _ ( 1 ) H _ ( k ) · u _ ( 2 ) H _ ( k ) · u _ ( M ) ] , Eq ( 6 )
    where {u(1) u(2) . . . u(M)}⊂{u1 u2 . . . uV}.
  • [0058]
    As shown in equation (3) and illustrated in FIG. 3, an effective MIMO channel with V virtual antennas is formed by the use of the orthonormal matrix U. Data is sent on all or a subset of the V virtual antennas. A used MIMO channel is formed by the M virtual antennas used for transmission.
  • [0059]
    For the transmission scheme described above, an R×T MIMO system is effectively reduced to an R×V MIMO system. The transmitter appears as if it has V virtual antennas rather than T transmit antennas, where V≦T. This transmission scheme decreases the channel estimation overhead order to C=V. However, the spatial multiplexing order is limited to V, or M≦V, and the spatial diversity order is also limited to V, or D≦V.
  • [0060]
    The description above is for one subcarrier k. The transmitter may perform the same processing for each subcarrier used for transmission. The frequency diversity of each virtual antenna across subcarriers is the same as the frequency diversity of the physical transmit antennas. However, the spatial diversity is reduced from T to V.
  • [0061]
    In another embodiment, the transmitter processes the output symbols for transmission, as follows:
    {tilde over (x)}(k)=D(kU·P(ks(k),   Eq (7)
    where D(k) is a T×T diagonal matrix for subcarrier k. D(k) is used to achieve cyclic delay diversity, which improves the frequency selectivity of the virtual antennas and may improve spatial diversity order to somewhere between V and T. Cyclic delay diversity may be achieved in the time domain or the frequency domain.
  • [0062]
    Cyclic delay diversity may be achieved in the time domain by circularly shifting (or cyclically delaying) the sequence of K time-domain samples (obtained from the K-point IDFT or IFFT) for each transmit antenna i by a delay of Ti, for i=1, . . . , T. For example, Ti may be defined as Ti=(i−1)·J, where J may be equal to one sample period, a fraction of a sample period, or more than one sample period. J may be selected such that the channel impulse response for each virtual antenna is expected to be shorter than the cyclic prefix length. A cyclic delay of X samples may be achieved by moving the last X samples in the sequence of K time-domain samples to the front of the sequence. The time-domain samples for the T transmits antenna are cyclically delayed by different amounts. A cyclic prefix may be appended after applying the cyclic delay in order to ensure orthogonality among the K total subcarriers.
  • [0063]
    Cyclic delay diversity may also be achieved in the frequency domain by applying a phase ramp (or a progressive phase shift) across the K total subcarriers for each transmit antenna. T different phase ramps are used for the T transmit antennas to achieve K different cyclic delays for these antennas. The diagonal matrix D(k) for each subcarrier k may be defined as follows: D _ ( k ) = [ 1 0 0 0 j2π · ( k - 1 ) · J / T 0 0 0 j2π · ( k - 1 ) · ( T - 1 ) · J / T ] , for k = 1 , , K , Eq ( 8 )
    As indicated by equation (8), transmit antenna 1 has a phase slope of 0 across the K total subcarriers, transmit antenna 2 has a phase slope of 2π·J/T across the K total subcarriers, and so on, and transmit antenna T has a phase slope of 2π(T−1)·J/T across the K total subcarriers. The diagonal matrix D(k) and the orthonormal matrix U may also be combined to obtain a new orthonormal matrix U(k)=D(k)·U, where U(k) may be applied to the data vector s(k).
  • [0064]
    The received symbols with cyclic delay diversity may be expressed as: r ~ _ ( k ) = H _ ( k ) · x ~ _ ( k ) + n _ ( k ) , = H _ ( k ) · D _ ( k ) · U _ · P _ ( k ) · s _ ( k ) + n _ ( k ) , = H ~ _ eff ( k ) · P _ ( k ) · s _ ( k ) + n _ ( k ) , = H ~ _ used ( k ) · s _ ( k ) + n _ ( k ) , Eq ( 9 )
    where {tilde over (r)}(k) is an R×1 received vector with cyclic delay diversity;
      • {tilde over (H)}eff(k) is an R×V effective channel response matrix with cyclic delay diversity; and
      • {tilde over (H)}used(k) is an R×M used channel response matrix with cyclic delay diversity.
  • [0067]
    The effective and used channel response matrices may be given as: H ~ _ eff ( k ) = H _ ( k ) · D _ ( k ) · U _ , = [ H _ ( k ) · D _ ( k ) · u _ 1 H _ ( k ) · D _ ( k ) · u _ 2 H _ ( k ) · D _ ( k ) · u _ V ] , and Eq ( 10 ) H ~ _ used ( k ) = H ~ _ eff ( k ) · P _ ( k ) , = [ H _ ( k ) · D _ ( k ) · u _ ( 1 ) H _ ( k ) · D _ ( k ) · u _ ( 2 ) H _ ( k ) · D _ ( k ) · u _ ( M ) ] . Eq ( 11 )
  • [0068]
    FIG. 4 shows a model 400 for the transmission scheme given by equation (7). Within a virtual antenna mapper 410, a symbol-to-virtual antenna mapping unit 412 multiplies the data vector s(k) with the permutation matrix P(k) and generates a V×1 vector. A spatial spreading unit 414 multiplies the V×1 vector with the orthonormal matrix U and generates a T×1 vector. A cyclic delay diversity unit 416 multiplies the T×1 vector with the diagonal matrix D(k) and generates the T×1 transmit vector x(k). The transmit vector x(k) is transmitted from the T transmit antennas and via a MIMO channel 450 to R receive antennas at a receiver.
  • [0069]
    As shown in equation (7) and illustrated in FIG. 4, an effective MIMO channel {tilde over (H)}eff(k) with V virtual antennas is formed by the use of the orthonormal matrix U and cyclic delay diversity. A used MIMO channel {tilde over (H)}used(k) is formed by the M virtual antennas used for transmission.
  • [0070]
    Equations (3) and (7) assume that equal transmit power is used for the M output symbols being sent simultaneously on one subcarrier in one symbol period. In general, the transmit power available for each transmit antenna may be uniformly or non-uniformly distributed across the subcarriers used for transmission. The transmit powers available for the T transmit antennas for each subcarrier may be uniformly or non-uniformly distributed to the M output symbols being sent on that subcarrier. Different transmit powers may be used for the M output symbols by scaling the data vector s(k) with a diagonal gain matrix G as follows: x(k)=U·P(k)·G·s(k) or {tilde over (x)}(k)=D(k)·U·P(k)·G·s(k), where diag {G}={g1 g2 . . . gm} and gi is the gain for output symbol si.
  • [0071]
    Various types of matrices may be used to form the orthonormal matrix U. For example, U may be formed based on a Fourier matrix, a Walsh matrix, or some other matrix. A T×T Fourier matrix FT×T has element fn,m in the n-th row of the m-th column, which may be expressed as: f n , m = - j2π ( n - 1 ) ( m - 1 ) T , for n = 1 , , T and m = 1 , T . Eq ( 12 )
    Fourier matrices of any square dimension (e.g., 2, 3, 4, 5, 6, and so on) may be formed. A 2×2 Walsh matrix W2×2 and larger size Walsh matrix W2N×2N may be expressed as: W _ 2 × 2 = [ 1 1 1 - 1 ] and W _ 2 N × 2 N = [ W _ N × N W _ N × N W _ N × N - W _ N × N ] . Eq ( 13 )
  • [0072]
    In an embodiment, the orthonormal matrix U is equal to a matrix containing V columns of a T×T Fourier matrix or a T×T Walsh matrix. In another embodiment, U is formed as follows:
    U=Λ·F   Eq (14)
    where F is a T×V matrix containing the first V columns of the T×T Fourier matrix; and
      • Λ is a T×T diagonal matrix containing T scaling values for the T rows of F.
        For example, the diagonal matrix Λ may be defined as Λ=diag{1 e 1 . . . e T }, where θi for i=1, . . . , T may be random phases. Equation (14) multiplies the rows of F with random phases, which changes the spatial directions depicted by the columns of F. In yet another embodiment, U is an orthonormal matrix with pseudo-random elements, e.g., having unit magnitude and pseudo-random phases.
  • [0074]
    The transmitter may send a MIMO, SIMO or SISO transmission to a receiver on a set of subcarriers, which are called the assigned subcarriers. The K total subcarriers may be partitioned into multiple non-overlapping subcarrier sets. In this case, the transmitter may transmit to multiple receivers simultaneously on multiple subcarrier sets. The transmitter may send the same or different types of transmission to these multiple receivers. For example, the transmitter may send a MIMO transmission on a first subcarrier set to a first receiver, a SIMO transmission on a second subcarrier set to a second receiver, a SISO transmission on a third subcarrier set to a third receiver, and so on.
  • [0075]
    A SIMO or SISO transmission may be sent from a single virtual antenna formed with a single column of the orthonormal matrix U. In this case, M=V=1, and the effective MIMO channel becomes an R×1 SISO or SIMO channel having a channel response vector of h eff(k)=H(k)·u1 or {tilde over (h)} eff(k)=H(k)·D(k)·u1. The data vector s(k) becomes a 1×1 vector containing a single output symbol, the permutation matrix P(k) becomes a 1×1 matrix containing a single ‘1’, and the orthonormal matrix U becomes a T×1 matrix containing a single column.
  • [0076]
    A MIMO transmission may be sent from multiple virtual antennas formed with multiple columns of the orthonormal matrix U. If the number of output symbols is less than the number of virtual antennas (or M<S), then M virtual antennas may be selected for use in various manners.
  • [0077]
    FIG. 5 shows an embodiment for transmitting output symbols cyclically from the V virtual antennas. For this embodiment, the first M output symbols are sent from virtual antennas 1 through M on the first assigned subcarrier, the next M output symbols are sent from virtual antennas 2 through M+1 on the next assigned subcarrier, and so on. The assigned subcarriers may be given indices of k=1, 2, . . . . For the embodiment shown in FIG. 5, the M virtual antennas used for subcarrier k+1 are offset by one from the M virtual antennas used for subcarrier k. The selected virtual antennas wrap around to virtual antenna 1 upon reaching the last virtual antenna. Hence, virtual antennas ((k−1) mod V)+1 through ((k+M−2) mod V)+1 are used for assigned subcarrier k, where “mod S” denotes a modulo-S operation and the “−1” and “+1” are due to the index for the assigned subcarriers and the index for the virtual antennas starting with 1 instead of 0. The M columns of the permutation matrix P(k) for each assigned subcarrier k are the ((k−1, k, k+1, . . . , k+M−2).mod V)+1 columns of a V×V identify matrix. For example, if M=2 and V=3, then the permutation matrices may be defined as: P ( 1 ) = [ 1 0 0 1 0 0 ] , P ( 2 ) = [ 0 0 1 0 0 1 ] , P ( 3 ) = [ 0 1 0 0 1 0 ] , P ( 4 ) = [ 1 0 0 1 0 0 ] , and so on . Eq ( 15 )
  • [0078]
    In another embodiment, the first M output symbols are sent from virtual antennas 1 through M on the first assigned subcarrier, the next M output symbols are sent from virtual antennas M+1 through ((2M−1) mod V)+1 on the next assigned subcarrier, and so on. For this embodiment, the M virtual antennas used for subcarrier k+1 start after the last virtual antenna used for subcarrier k. In yet another embodiment, the M virtual antennas for each subcarrier are selected in a pseudo-random manner, e.g., based on a pseudo-random number (PN) generator or sequence that is also known to the receiver.
  • [0079]
    In yet another embodiment, the virtual antennas are selected based on feedback from a receiver. For example, the feedback may indicate the specific virtual antennas to use for all assigned subcarriers, the specific virtual antennas to use for each assigned subcarrier, and so on. In yet another embodiment, the transmitter may select the virtual antennas based on a pilot or some other transmission received from the receiver. For example, the transmitter may estimate the uplink channel response based on the received pilot, estimate the downlink channel response based on the uplink channel response estimate, and select the virtual antennas based on the downlink channel response estimate. The downlink and uplink channel responses may be similar, e.g., in a time division duplexed (TDD) system in which downlink and uplink transmissions are sent on the same frequency channel but in different time intervals.
  • [0080]
    In general, the virtual antennas may be selected (1) by the transmitter in a deterministic manner (e.g., cyclically) or a pseudo-random manner without feedback from the receiver, (2) by the transmitter based on feedback from receiver, or (3) by the receiver and sent to the transmitter.
  • [0081]
    The orthonormal matrix U may be fixed, and the V virtual antennas formed with U may be selected for use as described above. In another embodiment, one or more orthonormal matrices are selected for use from among a set of orthonormal matrices available for use. The set of orthonormal matrices forms a codebook, and one or more entries of the codebook may be used for transmission. The orthonormal matrices in the set are different (and may be pseudo-random) with respect to each other. For example, the orthonornal matrices may be defined to provide good performance for different channel conditions, e.g., low and high SNR conditions, low and high mobility, and so on. One orthonormal matrix may be selected for all assigned subcarriers, for each assigned subcarrier, and so on. The matrix selection may be made (1) by the transmitter with or without feedback from a receiver or (2) by the receiver and sent back to the transmitter. The matrix selection may be made based on various factors such as, e.g., the channel conditions, mobility, uplink resources, and so on. In general, the particular entry or entries in the codebook to use for transmission may be selected either autonomously by the transmitter or based on feedback from the receiver.
  • [0082]
    The transmission schemes described herein has the following desirable features:
      • Flexibility to easily select the number of virtual antennas;
      • Flexibility to send any number of output symbols up to the number of available virtual antennas; and
      • Utilization of all T transmit antennas for transmission regardless of the number of output symbols being sent and the number of available virtual antennas.
  • [0086]
    The number of virtual antennas (V) may be selected to support the desired spatial multiplexing order (M), to achieve the desired spatial diversity order (D), and to obtain the desired channel estimation overhead order (C). The number of virtual antennas may be selected autonomously by the transmitter or based on a feedback from the receiver. The desired number of virtual antennas may readily be obtained by defining the orthonormal matrix U with the proper number of columns.
  • [0087]
    The spatial multiplexing order is limited by the number of transmit antennas and the number of receive antennas, or M≦min {T, R}. A higher spatial multiplexing order may be desirable in certain scenarios (e.g., high SNR conditions) and if supported by the receiver. A lower spatial multiplexing order (e.g., M=1) may be desirable in other scenarios (e.g., low SNR conditions) or if a higher spatial multiplexing order is not supported by the receiver. The spatial multiplexing order may be dynamically selected based on the channel conditions and/or other factors. For example, the spatial multiplexing order may be set to one if the SNR is less than a first threshold, set to two if the SNR is between the first threshold and a second threshold, set to three if the SNR is between the second threshold and a third threshold, and so on. The number of virtual antennas is selected to be equal to or greater than the spatial multiplexing order, or V≧M.
  • [0088]
    In general, a higher spatial diversity order is desirable in order to improve performance, and a lower channel estimation overhead order is desirable in order to reduce the amount of link resources used to transmit a pilot for channel estimation. The channel estimation overhead order is closely related to the spatial diversity order, and both are determined by the number of virtual antennas. Hence, the number of virtual antennas may be dynamically selected based on the desired spatial diversity order, the desired channel estimation overhead order, the channel conditions, and/or other factors.
  • [0089]
    The number of virtual antennas may be selected in various manners. In an embodiment, the number of virtual antennas is set equal to the spatial multiplexing order, or V=M. In another embodiment, the number of virtual antennas is set to a largest possible value such that the link resources used for pilot transmission is maintained within a predetermined percentage of the total link resources. In yet another embodiment, the number of virtual antennas is set based on the channel conditions. For example, one virtual antenna may be defined if the SNR is less than a first value, two virtual antennas may be defined if the SNR is between the first value and a second value, and so on.
  • [0090]
    The transmission schemes described herein may be used with various subcarrier structures, some of which are described below. The following description assumes that the K total subcarriers are usable for transmission and are given indices of 1 through K.
  • [0091]
    FIG. 6A shows an interlace subcarrier structure 600. For this subcarrier structure, the K total subcarriers are arranged into S non-overlapping interlaces, each interlace contains N subcarriers that are uniformly distributed across the K total subcarriers, and consecutive subcarriers in each interlace are spaced apart by S subcarriers, where K=S·N. Interlace u contains subcarrier u as the first subcarrier, where u ∈ {1, . . . , S}.
  • [0092]
    FIG. 6B shows a block subcarrier structure 610. For this subcarrier structure, the K total subcarriers are arranged into S non-overlapping blocks, with each block containing N adjacent subcarriers, where K=S·N. Block v contains subcarriers v·N+1 through (v+1)·N, where v ∈ {1, . . . , S}.
  • [0093]
    FIG. 6C shows a group subcarrier structure 620. For this subcarrier structure, the K total subcarriers are arranged into S non-overlapping groups, each group contains G subgroups that are distributed across the system bandwidth, and each subgroup contains L adjacent subcarriers, where K=S·N and N=G·L. The K total subcarriers may be partitioned into G frequency ranges, with each frequency range containing S·L consecutive subcarriers. Each frequency range is further partitioned into S subgroups, with each subgroup containing L consecutive subcarriers. For each frequency range, the first L subcarriers are allocated to group 1, the next L subcarriers are allocated to group 2, and so on, and the last L subcarriers are allocated to group S. Each group contains G subgroups of L consecutive subcarriers, or a total of N=G·L subcarriers.
  • [0094]
    In general, the transmission techniques described herein may be used for any subcarrier structure with any number of subcarrier sets. Each subcarrier set may include any number of subcarriers that may be arranged in any manner. For example, a subcarrier set may be equal to an interlace, a subcarrier block, a subcarrier group, and so on. For each subcarrier set, (1) the subcarriers in the set may be uniformly or non-uniformly distributed across the system bandwidth, (2) the subcarriers in the set may be adjacent to one another in one group, or (3) the subcarriers in the set may be distributed in multiple groups, where each group may be located anywhere within the system bandwidth and may contain one or multiple subcarriers.
  • [0095]
    For all of the subcarrier structures described above, different receivers may be assigned different subcarrier sets, and the transmitter may transmit data to each receiver on its assigned subcarrier set. The transmitter may use the same orthonormal matrix U for all receivers, a different orthonormal matrix for each receiver, a different orthonormal matrix for each subcarrier set, a different orthonormal matrix for each subcarrier, and so on.
  • [0096]
    The transmission techniques described herein may be used with or without frequency hopping. With frequency hopping, the data transmission hops from subcarrier to subcarrier in a pseudo-random or deterministic manner over time, which allows the data transmission to better withstand deleterious channel conditions such as narrowband interference, jamming, fading, and so on. Frequency hopping can provide frequency diversity and interference randomization. A receiver may be assigned a traffic channel that is associated with a hop pattern that indicates which subcarrier set(s), if any, to use in each time slot. A hop pattern is also called a frequency hopping pattern or sequence. A time slot is the amount of time spent on a given subcarrier set and is also called a hop period. The hop pattern may select different subcarrier sets in different time slots in a pseudo-random or deterministic manner.
  • [0097]
    FIG. 7 shows an exemplary frequency hopping scheme 700. In FIG. 7, traffic channel 1 is mapped to a specific sequence of time-frequency blocks. Each time-frequency block is a specific subcarrier set in a specific time slot. In the example shown in FIG. 7, traffic channel 1 is mapped to subcarrier set 1 in time slot 1, subcarrier set 4 in time slot 2, and so on. Traffic channels 2 through S may be mapped to vertically and circularly shifted versions of the time-frequency block sequence for traffic channel 1. For example, traffic channel 2 may be mapped to subcarrier set 2 in time slot 1, subcarrier set 5 in time slot 2, and so on.
  • [0098]
    Frequency hopping may be used with any of the subcarrier structures shown in FIGS. 6A through 6C. For example, a symbol rate hopping scheme may be defined in which each time-frequency block is a specific interlace in one symbol period. For this hopping scheme, the assigned subcarriers span across the entire system bandwidth and change from symbol period to symbol period. As another example, a block hopping scheme may be defined in which each time-frequency block is a specific subcarrier block in a time slot of multiple symbol periods. For this hopping scheme, the assigned subcarriers are contiguous and fixed for an entire time slot but changes from time slot to time slot. For the block hopping scheme, the spatial multiplexing order may be set equal to the number of virtual antennas, so that constant interference may be observed on any given time-frequency block in any sector for a system with synchronous sectors. Other hopping scheme may also be defined.
  • [0099]
    Pilot may be transmitted in various manners with the subcarrier structures described above. Some exemplary pilot schemes for symbol rate hopping and block hopping are described below.
  • [0100]
    FIG. 8 shows an exemplary pilot scheme 800 for symbol rate hopping. For pilot scheme 800, the transmitter transmits a common pilot on one interlace from virtual antenna 1 in each symbol period. The transmitter may transmit the common pilot on different interlaces in different symbol periods, as shown in FIG. 8. Such a staggered pilot allows a receiver to sample the frequency spectrum on more subcarriers and to derive a longer channel impulse response estimate. The transmitter may also transmit an auxiliary pilot on one or more interlaces from the remaining virtual antennas to allow MIMO receivers to estimate the channel response for all virtual antennas used for transmission. For the embodiment shown in FIG. 8, the transmitter transmits the auxiliary pilot on one interlace in each symbol period and cycles through virtual antennas 2 through V in V−1 different symbol periods. For the case with V=4 as shown in FIG. 8, the transmitter transmits the auxiliary pilot from virtual antenna 2 in symbol period n+1, then from virtual antenna 3 in symbol period n+2, then from virtual antenna 4 in symbol period n+3, then from virtual antenna 2 in symbol period n+4, and so on.
  • [0101]
    The transmitter may transmit the common and auxiliary pilots in other manners. In another embodiment, the auxiliary pilot is staggered and sent on different sets of subcarriers. In yet another embodiment, the common pilot is sent on one or more subcarrier sets that are pseudo-random (or have random offsets) with respect to the one or more subcarrier sets used for the auxiliary pilot.
  • [0102]
    The transmitter may transmit the common pilot for MIMO, SIMO and SISO receivers and may transmit the auxiliary pilot only when MIMO receivers are present. The MIMO, SIMO and SISO receivers may use the common pilot to derive a channel estimate for the K total subcarriers of virtual antenna 1. A MIMO receiver may use the auxiliary pilot to derive channel estimates for virtual antennas 2 through V.
  • [0103]
    FIG. 9A shows an exemplary pilot scheme 910 for block hopping. For the embodiment shown in FIG. 9A, a time-frequency block is composed of 16 adjacent subcarriers k+1 through k+16 and further spans 8 symbol periods n+1 through n+8. For pilot scheme 910, the transmitter transmits a dedicated pilot on subcarriers k+3, k+9 and k+15 in each of symbol periods n+1 through n+3 and n+6 through n+8, or six strips of three pilot symbols. Each pilot symbol may be sent from any virtual antenna. For example, if V=3, then the transmitter may transmit the pilot from virtual antenna 1 in symbol periods n+1 and n+6, from virtual antenna 2 in symbol periods n+2 and n+7, and from virtual antenna 3 in symbol periods n+3 and n+8.
  • [0104]
    FIG. 9B shows an exemplary pilot scheme 920 for block hopping. For pilot scheme 920, the transmitter transmits a dedicated pilot on subcarriers k+3, k+9 and k+15 in each of symbol periods n+1 through n+8, or three strips of eight pilot symbols. Each pilot symbol may be sent from any virtual antenna. For example, if V=4, then the transmitter may transmit the pilot from virtual antenna 1 in symbol periods n+1 and n+5, from virtual antenna 2 in symbol periods n+2 and n+6, from virtual antenna 3 in symbol periods n+3 and n+7, and from virtual antenna 4 in symbol periods n+4 and n+8.
  • [0105]
    FIG. 9C shows an exemplary pilot scheme 930 for block hopping. For pilot scheme 930, the transmitter transmits a dedicated pilot on subcarriers k+1, k+4, k+7, k+10, k+13 and k+16 in each of symbol periods n+1, n+2, n+7 and n+8. Each pilot symbol may be sent from any virtual antenna. For example, the transmitter may transmit the pilot from virtual antenna 1 in symbol period n+1, from virtual antenna 2 in symbol period n+2, from virtual antenna 1 or 3 in symbol period n+7, and from virtual antenna 2 or 4 in symbol period n+8.
  • [0106]
    FIG. 9D shows an exemplary pilot scheme 940 for block hopping. For pilot scheme 940, the transmitter transmits a staggered pilot on three subcarriers in each symbol period and on different pilot subcarriers in different symbol periods. Each pilot symbol may be sent from any virtual antenna. For example, the transmitter may transmit the pilot from a different virtual antenna in each symbol period and may cycle through the V virtual antennas in V symbol periods.
  • [0107]
    In general, for the block hopping scheme, the transmitter may transmit a pilot in each time-frequency block such that a receiver is able to derive a channel estimate for each virtual antenna used for transmission. FIGS. 9A through 9D show four exemplary pilot patterns that may be used. Other pilot patterns may also be defined and used for pilot transmission.
  • [0108]
    For both symbol rate hopping and block hopping, the transmitter may transmit the pilot from any number of virtual antennas, may use any number of pilot subcarriers for each virtual antenna, and may use any amount of transmit power for each virtual antenna. If the pilot is sent from multiple virtual antennas, then the transmitter may use the same or different numbers of subcarriers for these virtual antennas and may transmit the pilot at the same or different power levels for the virtual antennas. The transmitter may or may not stagger the pilot for each virtual antenna. The transmitter may transmit the pilot on more subcarriers to allow a receiver to obtain more “look” of the wireless channel in the frequency domain and to derive a longer channel impulse response estimate. The transmitter may transmit the pilot on all pilot subcarriers from one virtual antenna in each symbol period, as described above. Alternatively, the transmitter may transmit the pilot from multiple virtual antennas on multiple subsets of subcarriers in a given symbol period.
  • [0109]
    In an embodiment, the transmitter transmits the pilot from the virtual antennas, as described above for FIGS. 8 through 9D. In another embodiment, the transmitter transmits the pilot from the physical antennas, without applying the orthonormal matrix U or the permutation matrix P(k). For this embodiment, a receiver may estimate the actual channel response based on the pilot and may then derive an effective channel response estimate based on the actual channel response estimate and the orthonormal and permutation matrices.
  • [0110]
    FIG. 10 shows a process 1000 for transmitting data and pilot to one or more receivers. The processing for each receiver may be performed as follows. The set of subcarriers assigned to the receiver and the spatial multiplexing order (M) for the receiver are determined, where M≧1 (block 1012). For each assigned subcarrier, M virtual antennas are selected for use from among V virtual antennas formed with V columns of the orthonormal matrix U, where V≧M (block 1014). The M virtual antennas for each assigned subcarrier may be selected in various manners, as described above. The output symbols for the receiver are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix (block 1016). The mapped output symbols (or transmit symbols) are provided for transmission from T transmit antennas, where T≧V (block 1018).
  • [0111]
    Pilot symbols are also mapped to the virtual antennas used for transmission (block 1020). For example, pilot symbols for a common pilot may be mapped to the first virtual antenna on a first set of pilot subcarriers, and pilot symbols for an auxiliary pilot may be mapped to the remaining virtual antennas on a second set of pilot subcarriers.
  • [0112]
    If there are multiple receivers, then the same or different spatial multiplexing orders may be used for these receivers. Furthermore, data may be sent simultaneously on different subcarrier sets to multiple receivers. For example, data may be sent from one virtual antenna on a first subcarrier set to a SIMO or SISO receiver, from multiple virtual antennas on a second subcarrier set to a MIMO receiver, and so on. In any case, the transmit symbols for all receivers are demultiplexed to the T transmit antennas (block 1022). For each transmit antenna, the transmit symbols for each receiver are mapped to the subcarriers assigned to that receiver (also block 1022). Transmission symbols are then generated for each transmit antenna based on the transmit symbols for that transmit antenna and using, e.g., OFDM or SC-FDMA (block 1024). Different cyclic delays may be applied for the T transmit antennas, e.g., by circularly delaying the transmission symbols for each transmit antenna by a different amount (block 1026).
  • [0113]
    For block 1016 in FIG. 10, the output symbol(s) for each subcarrier assigned to each receiver are mapped to the T transmit antennas based on M mapping patterns selected from among V mapping patterns available for use. Each mapping pattern indicates a specific mapping of an output symbol to the T transmit antennas. The V mapping patterns may be formed by V columns of an orthonormal matrix or in other manners. Different mapping patterns may be selected for different subcarriers in a given symbol period and/or different symbol periods, e.g., based on a predetermined pattern. The predetermined pattern may be defined by a permutation matrix or in some other manner. The predetermined pattern may cycle through the V available mapping patterns in different subcarriers and/or symbol periods.
  • [0114]
    FIG. 11 shows an embodiment of an apparatus 1100 for transmitting data and pilot to one or more receivers. Apparatus 1100 includes means for determining the set of subcarriers assigned to each receiver and the spatial multiplexing order (M) for each receiver (block 1112), means for selecting M virtual antennas for use from among V virtual antennas for each subcarrier assigned to each receiver (block 1114), means for mapping the output symbols for each receiver to the virtual antennas selected for each subcarrier assigned to the receiver (e.g., by applying selected columns of an orthonormal matrix or selected mapping patterns) (block 1116), means for providing the mapped output symbols (or transmit symbols) for transmission from T transmit antennas (block 1118), means for mapping pilot symbols to the virtual antennas used for transmission (block 1120), means for demultiplexing the transmit symbols for each receiver to the assigned subcarriers of the T transmit antennas (block 1122), means for generating transmission symbols for each transmit antenna, e.g., using OFDM or SC-FDMA (block 1124), and means for applying different cyclic delays for the T transmit antennas (block 1126).
  • [0115]
    FIG. 12 shows a block diagram of an embodiment of base station 110, single-antenna terminal 120 x, and multi-antenna terminal 120 y. At base station 110, a transmit (TX) data processor 1210 receives data for one or more terminals, processes (e.g., encodes, interleaves, and symbol maps) the data based on one or more coding and modulation schemes, and provides modulation symbols. TX data processor 1210 typically processes the data for each terminal separately based on a coding and modulation scheme selected for that terminal. If system 100 utilizes SC-FDMA, then TX data processor 1210 may perform FFT/DFT on the modulation symbols for each terminal to obtain frequency-domain symbols for that terminal. TX data processor 1210 obtains output symbols for each terminal (which may be modulation symbols for OFDM or frequency-domain symbols for SC-FDMA) and multiplexes the output symbols for the terminal onto the subcarriers and virtual antennas used for that terminal. TX data processor 1210 further multiplexes pilot symbols onto the subcarriers and virtual antennas used for pilot transmission.
  • [0116]
    A TX spatial processor 1220 receives the multiplexed output symbols and pilot symbols, performs spatial processing for each subcarrier, e.g., as shown in equation (3) or (7), and provides transmit symbols for the T transmit antennas. A modulator (Mod) 1222 processes the transmit symbols for each transmit antenna, e.g., for OFDM, SC-FDMA, or some other modulation technique, and generates an output sample stream for that transmit antenna. Since TX spatial processor 1220 performs spatial processing for each subcarrier, the SC-FDMA modulation is divided into two parts that are performed by TX data processor 1210 and modulator 1222. Modulator 1222 provides T output sample streams to T transmitter units (TMTR) 1224 a through 1224 t. Each transmitter unit 1224 processes (e.g., converts to analog, amplifies, filters, and frequency upconverts) its output sample stream and generates a modulated signal. T modulated signals from transmitter units 1224 a through 1224 t are transmitted from T antennas 112 a through 112 t, respectively.
  • [0117]
    At each terminal 120, one or multiple antennas 122 receive the modulated signals transmitted by base station 110, and each antenna provides a received signal to a respective receiver unit (RCVR) 1254. Each receiver unit 1254 processes (e.g., amplifies, filters, frequency downconverts, and digitalizes) its receive signal and provides received samples to a demodulator (Demod) 1256. Demodulator 1256 processes the received samples for each receive antenna 122 (e.g., based on OFDM, SC-FDMA, or some other modulation technique), obtains frequency-domain received symbols for the K total subcarriers, provides received symbols for the assigned subcarriers, and provides received pilot symbols for the subcarriers used for pilot transmission.
  • [0118]
    For single-antenna terminal 120 x, a data detector 1260 x obtains received symbols from demodulator 1256 x, derives channel estimates for the assigned subcarriers based on the received pilot symbols, and performs data detection (e.g., equalization) on the received symbols based on the channel estimates to obtain detected symbols, which are estimates of the output symbols transmitted to terminal 120 x. For multi-antenna terminal 120 y, a receive (RX) spatial processor 1260 y obtains received symbols from demodulator 1256 y, derives channel estimates for the assigned subcarriers based on the received pilot symbols, and performs receiver spatial processing on the received symbols based on the channel estimates to obtain detected symbols. RX spatial processor 1260 y may implement a minimum mean square error (MMSE) technique, a zero-forcing (ZF) technique, a maximal ratio combining (MRC) technique, a successive interference cancellation technique, or some other receiver processing technique. For each terminal, an RX data processor 1262 processes (e.g., symbol demaps, deinterleaves, and decodes) the detected symbols and provides decoded data for the terminal. In general, the processing by each terminal 120 is complementary to the processing by base station 110.
  • [0119]
    Each terminal 120 may generate feedback information for the data transmission to that terminal. For example, each terminal 120 may estimate the SNRs for the virtual antennas, e.g., based on the received pilot symbols. Each terminal 120 may select one or more coding and modulation schemes, one or more packet formats, one or more virtual antennas to use for data transmission, one or more orthonormal matrices, and so on based on the SNR estimates and/or other information. Each terminal 120 may also generate acknowledgments (ACKs) for correctly received data packets. The feedback information may include the SNR estimates, the selected coding and modulation schemes, the selected virtual antenna(s), the selected orthonormal matrix(ces), the selected subcarrier(s), ACKs, information used for power control, some other information, or any combination thereof. The feedback information is processed by a TX data processor 1280, further processed by a TX spatial processor 1282 if multiple antennas are present, modulated by a modulator 1284, conditioned by transmitter unit(s) 1254, and transmitted via antenna(s) 122 to base station 110. At base station 110, the modulated signals transmitted by terminals 120 x and 120 y are received by antennas 112, conditioned by receiver units 1224, and processed by a demodulator 1240, an RX spatial processor 1242, and an RX data processor 1244 to recover the feedback information sent by the terminals. A controller/processor 1230 uses the feedback information to determine the data rates and coding and modulation schemes to use for the data transmission to each terminal as well as to generate various controls for TX data processor 1210 and TX spatial processor 1220.
  • [0120]
    Controllers/processors 1230, 1270 x and 1270 y control the operation of various processing units at base station 110 and terminals 120 x and 120 y, respectively. Memory units 1232, 1272 x and 1272 y store data and program codes used by base station 110 and terminals 120 x and 120 y, respectively. Controller/processor 1230 may implement parts of FIGS. 10 and 11 and may (1) assign subcarriers and select the spatial multiplexing order for each terminal (block 1012 in FIG. 10) and (2) select the virtual antennas for each subcarrier assigned to each terminal (block 1214 in FIG. 10). TX data processor 1220 may implement parts of FIGS. 10 and 11 and perform the processing shown in blocks 1116 through 1126 in FIG. 10.
  • [0121]
    For clarity, much of the description above is for a system with K total subcarriers. The transmission techniques described herein may also be used for a system with a single subcarrier. For such a system, k in the description above may be an index for symbol period instead of subcarrier.
  • [0122]
    The transmission techniques described herein may be implemented by various means. For example, these techniques may be implemented in hardware, firmware, software, or a combination thereof. For a hardware implementation, the processing units at a transmitter may be implemented within one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein, or a combination thereof. The processing units at a receiver may also be implemented within one or more ASICs, DSPs, processors, and so on.
  • [0123]
    For a software implementation, the transmission techniques may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory (e.g., memory 1230, 1272 x or 1272 y in FIG. 12) and executed by a processor (e.g., processor 1232, 1270 x or 1270 y). The memory may be implemented within the processor or external to the processor.
  • [0124]
    The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (40)

  1. 1. An apparatus comprising:
    at least one processor configured to select M virtual antennas to use for transmission from among V virtual antennas, to map output symbols to the M virtual antennas, and to provide the mapped output symbols for transmission from T transmit antennas, wherein M is equal to one or greater, V is equal to or greater than M, and T is equal to or greater than V; and
    a memory coupled to the at least one processor.
  2. 2. The apparatus of claim 1, wherein the at least one processor is configured to select different sets of M virtual antennas for different frequency subcarriers from among the V virtual antennas.
  3. 3. The apparatus of claim 1, wherein the at least one processor is configured to select a set of M virtual antennas for each of a plurality of frequency subcarriers by cycling through the V virtual antennas.
  4. 4. The apparatus of claim 1, wherein the at least one processor is configured to form a permutation matrix indicative of the M virtual antennas selected from among the V virtual antennas, to apply the permutation matrix to the output symbols, and to applying an orthonormal matrix used to form the V virtual antennas.
  5. 5. The apparatus of claim 1, wherein the at least one processor is configured to select one virtual antenna from among the V virtual antennas for a first receiver assigned with a first set of frequency subcarriers, to select more than one virtual antenna from among the V virtual antennas for a second receiver assigned with a second set of frequency subcarriers, to map output symbols for the first receiver to the first set of frequency subcarriers of the one virtual antenna, and to map output symbols for the second receiver to the second set of frequency subcarriers of the more than one virtual antenna.
  6. 6. The apparatus of claim 1, wherein the at least one processor is configured to apply T different cyclic delays for the T transmit antennas.
  7. 7. The apparatus of claim 1, wherein the at least one processor is configured to scale output symbols for the M virtual antennas with M gains.
  8. 8. The apparatus of claim 1, wherein the at least one processor is configured to transmit a first pilot on a first virtual antenna among the V virtual antennas, and to transmit a second pilot on remaining ones of the V virtual antennas.
  9. 9. The apparatus of claim 8, wherein the at least one processor is configured to transmit the first pilot on a first set of frequency subcarriers of the first virtual antenna, and to transmit the second pilot on a second set of frequency subcarriers by cycling through the remaining ones of the V virtual antennas.
  10. 10. The apparatus of claim 1, wherein the at least one processor is configured to transmit pilot symbols on at least one frequency subcarrier in at least one symbol period selected based on a pilot pattern.
  11. 11. The apparatus of claim 1, wherein the at least one processor is configured to select an orthonormal matrix from among a plurality of orthonormal matrices available to form the V virtual antennas.
  12. 12. The apparatus of claim 1, wherein the at least one processor is configured to receive feedback selecting an orthonormal matrix from among a plurality of orthonormal matrices available to form the V virtual antennas.
  13. 13. The apparatus of claim 1, wherein the at least one processor is configured to generate orthogonal frequency division multiplexing (OFDM) symbols for the T transmit antennas based on the mapped output symbols.
  14. 14. The apparatus of claim 1, wherein the at least one processor is configured to generate single-carrier frequency division multiple access (SC-FDMA) symbols for the T transmit antennas based on the mapped output symbols.
  15. 15. The apparatus of claim 1, wherein the at least one processor is configured to dynamically select M based on channel conditions.
  16. 16. The apparatus of claim 1, wherein the at least one processor is configured to dynamically select V based on channel conditions.
  17. 17. The apparatus of claim 1, wherein an orthonormal matrix, used to form the V virtual antennas, is defined such that equal transmit power is used for the T transmit antennas.
  18. 18. The apparatus of claim 1, wherein an orthonormal matrix, used to form the V virtual antennas, is based on a Fourier matrix or a Walsh matrix.
  19. 19. The apparatus of claim 1, wherein an orthonormal matrix, used to form the V virtual antennas is based upon scaling a Fourier matrix or a Walsh matrix with different random phases.
  20. 20. A method comprising:
    selecting M virtual antennas to use for transmission from among V virtual antennas, wherein M is one or greater and V is equal to or greater than M;
    mapping output symbols to the M virtual antennas; and
    providing the mapped output symbols for transmission from T transmit antennas, wherein T is equal to or greater than V.
  21. 21. The method of claim 20, further comprising:
    selecting different sets of M virtual antennas for different frequency subcarriers from among the V virtual antennas.
  22. 22. The method of claim 20, further comprising:
    applying T different cyclic delays for the T transmit antennas.
  23. 23. The method of claim 20, further comprising:
    transmitting a pilot on the M virtual antennas.
  24. 24. An apparatus comprising:
    means for selecting M virtual antennas to use for transmission from among V virtual antennas, wherein M is one or greater and V is equal to or greater than M;
    means for mapping output symbols to the M virtual antennas; and
    means for providing the mapped output symbols for transmission from T transmit antennas, wherein T is equal to or greater than V.
  25. 25. The apparatus of claim 24, further comprising:
    means for selecting different sets of M virtual antennas for different frequency subcarriers from among the V virtual antennas.
  26. 26. The apparatus of claim 24, further comprising:
    means for applying T different cyclic delays for the T transmit antennas.
  27. 27. The apparatus of claim 24, further comprising:
    means for transmitting a pilot on the M virtual antennas.
  28. 28. An apparatus comprising:
    at least one processor configured to select M1 virtual antennas to use for transmission to a first receiver from among V virtual antennas, to select M2 virtual antennas to use for transmission to a second receiver from among the V virtual antennas, to map output symbols for the first receiver to the M1 virtual antennas, to map output symbols for the second receiver to the M2 virtual antennas, to provide the mapped output symbols for the first receiver for transmission on a first frequency subcarrier of T transmit antennas, and to provide the mapped output symbols for the second receiver for transmission on a second frequency subcarrier of the T transmit antennas, wherein M1 and M2 are each equal to one or greater, V is equal to or greater than the larger of M1 and M2, and T is equal to or greater than V; and
    a memory coupled to the at least one processor.
  29. 29. The apparatus of claim 28, wherein the at least one processor is configured to apply T different cyclic delays for the T transmit antennas.
  30. 30. The apparatus of claim 28, wherein M1 is not equal to M2.
  31. 31. The apparatus of claim 28, wherein the first and second frequency subcarriers are one frequency subcarrier, and wherein transmissions are sent to the first and second receivers using spatial division multiple access (SDMA).
  32. 32. The apparatus of claim 28, wherein the at least one processor is configured to transmit a pilot on each virtual antenna used for transmission.
  33. 33. The apparatus of claim 28, wherein the at least one processor is configured to generate transmission symbols for the T transmit antennas based on the mapped output symbols and using orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiple access (SC-FDMA) modulation technique.
  34. 34. An apparatus comprising:
    means for selecting M1 virtual antennas to use for transmission to a first receiver from among V virtual antennas, wherein M1 is equal to one or greater and V is equal to or greater than M1;
    means for selecting M2 virtual antennas to use for transmission to a second receiver from among the V virtual antennas, wherein M2 is equal to one or greater and is also less than or equal to V;
    means for mapping output symbols for the first receiver to the M1 virtual antennas;
    means for mapping output symbols for the second receiver to the M2 virtual antennas;
    means for providing the mapped output symbols for the first receiver for transmission on a first frequency subcarrier of T transmit antennas, wherein T is equal to or greater than V; and
    means for providing the mapped output symbols for the second receiver for transmission on a second frequency subcarrier of the T transmit antennas.
  35. 35. The apparatus of claim 34, further comprising:
    means for applying T different cyclic delays for the T transmit antennas.
  36. 36. An apparatus comprising:
    at least one processor configured to map output symbols to a plurality of antennas based upon at least one mapping pattern selected from among a plurality of mapping patterns, wherein each mapping pattern indicates a specific mapping of an output symbol to the plurality of antennas; and
    a memory coupled to the at least one processor.
  37. 37. The apparatus of claim 36, wherein the at least one processor is configured to select different mapping patterns for different frequency subcarriers in a symbol period.
  38. 38. The apparatus of claim 36, wherein the at least one processor is configured to select different mapping patterns for symbol periods.
  39. 39. The apparatus of claim 36, wherein the at least one processor is configured to select different mapping patterns from among the plurality of mapping patterns for different frequency subcarriers or different symbol periods based on a predetermined pattern.
  40. 40. The apparatus of claim 36, wherein the at least one processor is configured to apply a different column of an orthonormal matrix for each of a plurality of frequency subcarriers in accordance with a predetermined pattern, wherein the orthonormal matrix includes a plurality of columns for the plurality of mapping patterns.
US11261823 2005-08-22 2005-10-27 Method and apparatus for providing antenna diversity in a wireless communication system Abandoned US20070041457A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US71040805 true 2005-08-22 2005-08-22
US71114405 true 2005-08-24 2005-08-24
US11261823 US20070041457A1 (en) 2005-08-22 2005-10-27 Method and apparatus for providing antenna diversity in a wireless communication system

Applications Claiming Priority (27)

Application Number Priority Date Filing Date Title
US11261823 US20070041457A1 (en) 2005-08-22 2005-10-27 Method and apparatus for providing antenna diversity in a wireless communication system
CN 201510024569 CN104618004A (en) 2005-08-22 2006-08-22 Method and apparatus for providing antenna diversity in a wireless communication system
CN 201510024343 CN104660316A (en) 2005-08-22 2006-08-22 Method and apparatus for providing antenna diversity in MIMO system
JP2008528102A JP5405108B2 (en) 2005-08-22 2006-08-22 Method and apparatus for providing antenna diversity in a wireless communication system
CN 200680038384 CN101288245B (en) 2005-08-22 2006-08-22 Method and apparatus for antenna selection in a mimo system
CA 2620067 CA2620067C (en) 2005-08-22 2006-08-22 Method and apparatus for selection of virtual antennas
CN 200680039275 CN101292442B (en) 2005-08-22 2006-08-22 The communication method and communication apparatus
CN 201510024446 CN104601212B (en) 2005-08-22 2006-08-22 A method for multi-input multi-output system and antenna selection equipment
ES06789944T ES2525474T3 (en) 2005-08-22 2006-08-22 Method and apparatus antenna selection in MIMO system
JP2008528093A JP4819897B2 (en) 2005-08-22 2006-08-22 How to select the virtual antennas and equipment
CN 201510024440 CN104660317B (en) 2005-08-22 2006-08-22 A method for multi-input multi-output system and antenna selection equipment
EP20060802139 EP1917737A1 (en) 2005-08-22 2006-08-22 Method and apparatus for selection of virtual antennas
CN 201610030660 CN105450278A (en) 2005-08-22 2006-08-22 Method and apparatus for selection of virtual antennas
KR20087007017A KR100962453B1 (en) 2005-08-22 2006-08-22 Method and apparatus for selection of virtual antennas
PCT/US2006/032900 WO2007024935A3 (en) 2005-08-22 2006-08-22 Method and apparatus for antenna selection in a mimo system
EP20060789944 EP1917736B1 (en) 2005-08-22 2006-08-22 Method and apparatus for antenna selection in a mimo system
KR20087006878A KR100954485B1 (en) 2005-08-22 2006-08-22 Method and apparatus for providing antenna diversity in a wireless communication system
PCT/US2006/032860 WO2007024913A1 (en) 2005-08-22 2006-08-22 Method and apparatus for selection of virtual antennas
JP2011153517A JP5479411B2 (en) 2005-08-22 2011-07-12 How to select the virtual antennas and equipment
US13271121 US9660776B2 (en) 2005-08-22 2011-10-11 Method and apparatus for providing antenna diversity in a wireless communication system
US13271113 US9860033B2 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems
US13271108 US20120140798A1 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems
JP2011268078A JP5389894B2 (en) 2005-08-22 2011-12-07 Method and apparatus for providing antenna diversity in a wireless communication system
JP2013150743A JP2014003625A (en) 2005-08-22 2013-07-19 Method and apparatus for providing antenna diversity in radio communication system
JP2014212940A JP2015053704A (en) 2005-08-22 2014-10-17 Method and apparatus for providing antenna diversity in wireless communication system
JP2015105732A JP6022641B2 (en) 2005-08-22 2015-05-25 Method and apparatus for providing antenna diversity in a wireless communication system
JP2016006115A JP6195944B2 (en) 2005-08-22 2016-01-15 Method and apparatus for providing antenna diversity in a wireless communication system

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US13271108 Continuation US20120140798A1 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems
US13271121 Continuation US9660776B2 (en) 2005-08-22 2011-10-11 Method and apparatus for providing antenna diversity in a wireless communication system
US13271113 Continuation US9860033B2 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems

Publications (1)

Publication Number Publication Date
US20070041457A1 true true US20070041457A1 (en) 2007-02-22

Family

ID=37395918

Family Applications (4)

Application Number Title Priority Date Filing Date
US11261823 Abandoned US20070041457A1 (en) 2005-08-22 2005-10-27 Method and apparatus for providing antenna diversity in a wireless communication system
US13271121 Active US9660776B2 (en) 2005-08-22 2011-10-11 Method and apparatus for providing antenna diversity in a wireless communication system
US13271108 Abandoned US20120140798A1 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems
US13271113 Active US9860033B2 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems

Family Applications After (3)

Application Number Title Priority Date Filing Date
US13271121 Active US9660776B2 (en) 2005-08-22 2011-10-11 Method and apparatus for providing antenna diversity in a wireless communication system
US13271108 Abandoned US20120140798A1 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems
US13271113 Active US9860033B2 (en) 2005-08-22 2011-10-11 Method and apparatus for antenna diversity in multi-input multi-output communication systems

Country Status (7)

Country Link
US (4) US20070041457A1 (en)
EP (1) EP1917736B1 (en)
JP (6) JP5405108B2 (en)
KR (1) KR100954485B1 (en)
CN (5) CN101288245B (en)
ES (1) ES2525474T3 (en)
WO (1) WO2007024935A3 (en)

Cited By (103)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050078764A1 (en) * 2003-08-29 2005-04-14 Mitsubishi Denki Kabushiki Kaisha Method for transmitting optimally interleaved data in a MIMO telecommunication system
US20060018336A1 (en) * 2004-07-21 2006-01-26 Arak Sutivong Efficient signaling over access channel
US20060188036A1 (en) * 2004-12-13 2006-08-24 Mitsubishi Denki Kabushiki Kaisha Method for transmitting uniformly distributed data in a MIMO telecommunication system
US20060203708A1 (en) * 2005-03-11 2006-09-14 Hemanth Sampath Systems and methods for beamforming feedback in multi antenna communication systems
US20060205357A1 (en) * 2005-03-11 2006-09-14 Byoung-Hoon Kim Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US20060203891A1 (en) * 2005-03-10 2006-09-14 Hemanth Sampath Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US20060209754A1 (en) * 2005-03-16 2006-09-21 Ji Tingfang Channel structures for a quasi-orthogonal multiple-access communication system
US20060209670A1 (en) * 2005-03-17 2006-09-21 Alexei Gorokhov Pilot signal transmission for an orthogonal frequency division wireless communication system
US20060209732A1 (en) * 2005-03-17 2006-09-21 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US20060223449A1 (en) * 2005-04-01 2006-10-05 Qualcomm Incorporated Systems and methods for control channel signaling
US20060233124A1 (en) * 2005-04-19 2006-10-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US20060233131A1 (en) * 2005-04-19 2006-10-19 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US20060274836A1 (en) * 2005-06-01 2006-12-07 Hemanth Sampath Sphere decoding apparatus
US20070041464A1 (en) * 2005-08-22 2007-02-22 Byoung-Hoon Kim Selective virtual antenna transmission
US20070041404A1 (en) * 2005-08-08 2007-02-22 Ravi Palanki Code division multiplexing in a single-carrier frequency division multiple access system
US20070049218A1 (en) * 2005-08-30 2007-03-01 Qualcomm Incorporated Precoding and SDMA support
US20070047485A1 (en) * 2005-08-24 2007-03-01 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US20070071127A1 (en) * 2005-09-23 2007-03-29 Qualcomm Incorporated Method and apparatus for pilot communication in a multi-antenna wireless communication system
US20070097942A1 (en) * 2005-10-27 2007-05-03 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US20070097853A1 (en) * 2005-10-27 2007-05-03 Qualcomm Incorporated Shared signaling channel
US20070097909A1 (en) * 2005-10-27 2007-05-03 Aamod Khandekar Scalable frequency band operation in wireless communication systems
US20070097927A1 (en) * 2005-10-27 2007-05-03 Alexei Gorokhov Puncturing signaling channel for a wireless communication system
US20070105503A1 (en) * 2005-03-11 2007-05-10 Byoung-Hoon Kim Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US20070206698A1 (en) * 2006-01-25 2007-09-06 Samsung Electronics Co., Ltd. Transmission/reception apparatus and method for supporting MIMO technology in a forward link of a high rate packet data system
US20070211616A1 (en) * 2005-10-27 2007-09-13 Aamod Khandekar Resource allocation for shared signaling channels
US20070211668A1 (en) * 2005-05-31 2007-09-13 Avneesh Agrawal Use of supplemental assignments to decrement resources
US20070211619A1 (en) * 2006-03-07 2007-09-13 Motorola, Inc. Method and apparatus for hybrid cdm ofdma wireless transmission
US20070249298A1 (en) * 2006-04-25 2007-10-25 Fujitsu Limited Communication apparatus based on multi-carrier modulation system
US20070274411A1 (en) * 2006-05-26 2007-11-29 Lg Electronics Inc. Signal generation using phase-shift based pre-coding
US20070280373A1 (en) * 2006-05-26 2007-12-06 Lg Electronics Inc. Phase shift based precoding method and transceiver for supporting the same
US20080025200A1 (en) * 2006-06-22 2008-01-31 Nokia Corporation Interference cancellation unit and interference cancellation method
US20080075190A1 (en) * 2006-09-26 2008-03-27 Realtek Semiconductor Corp. Apparatus and method for selecting antennas in MIMO multi-carrier system
US20080080637A1 (en) * 2006-10-02 2008-04-03 Samsung Electronics Co., Ltd. System and method for performing precoding in a wireless communication system
US20080080641A1 (en) * 2006-09-06 2008-04-03 Qualcomm Incorporated Codeword permutation and reduced feedback for grouped antennas
US20080089442A1 (en) * 2006-09-19 2008-04-17 Lg Electronics Inc. method of performing phase shift-based precoding and an apparatus for supporting the same in a wireless communication system
US20080089396A1 (en) * 2006-09-18 2008-04-17 Hongyuan Zhang Calibration Correction for Implicit Beamforming in a Wireless MIMO Communication System
US20080195917A1 (en) * 2007-02-09 2008-08-14 Interdigital Technology Corporation Method and apparatus for low complexity soft output decoding for quasi-static mimo channels
US20080198946A1 (en) * 2007-02-14 2008-08-21 Lg Electronics Inc. Data transmitting and receiving method using phase shift based precoding and transceiver supporting the same
US20080205533A1 (en) * 2006-09-19 2008-08-28 Lg Electronics Inc. Method of transmitting using phase shift-based precoding and apparatus for implementing the same in a wireless communication system
US20080219375A1 (en) * 2007-03-05 2008-09-11 Samsung Electronics Co. Ltd. Apparatus and method for spatial multiplexing with backward compatibility in a multiple input multiple output wireless communication system
US20080247364A1 (en) * 2007-02-06 2008-10-09 Qualcomm Incorporated Cyclic delay diversity and precoding for wireless communication
US20080303701A1 (en) * 2007-06-08 2008-12-11 Jianzhong Zhang CDD precoding for open loop su mimo
US20090135939A1 (en) * 2006-09-15 2009-05-28 Samsung Electronics Co., Ltd. Apparatus and method for space-time coding in multiple-antenna system
US20090180459A1 (en) * 2008-01-16 2009-07-16 Orlik Philip V OFDMA Frame Structures for Uplinks in MIMO Networks
WO2009098532A1 (en) * 2008-02-07 2009-08-13 Nokia Corporation Apparatus, methods, and computer program products providing improved spatial multiplexing for mimo communication
US20090276672A1 (en) * 2006-04-10 2009-11-05 Moon-Il Lee Repetitive transmissions in multi-carrier based wireless access techniques
WO2009149561A1 (en) * 2008-06-12 2009-12-17 Nortel Networks Limited Systems and methods for sc-fdma transmission diversity
US20100062705A1 (en) * 2008-09-10 2010-03-11 Qualcomm Incorporated Apparatus and method for interference-adaptive communications
US20100074362A1 (en) * 2008-09-25 2010-03-25 Jong Bu Lim Apparatus and method for transmitting and receiving signal in multiple input multiple output system
US20100085955A1 (en) * 2008-09-23 2010-04-08 Qualcomm Incorporated Transmit diversity for sc-fdma
US20100091641A1 (en) * 2008-09-23 2010-04-15 Qualcomm Incorporated Transmit diversity scheme for uplink data transmissions
US20100113078A1 (en) * 2008-10-22 2010-05-06 Qualcomm Incorporated Scope of channel quality reporting region in a multi-carrier system
US20100202500A1 (en) * 2007-09-19 2010-08-12 Bin Chul Ihm Data transmitting and receiving method using phase shift based precoding and transceiver supporting the same
US20100202560A1 (en) * 2009-02-02 2010-08-12 Qualcomm Incorporated Antenna virtualization in a wireless communication environment
US7787554B1 (en) * 2006-05-02 2010-08-31 Marvell International Ltd. Beamforming to a subset of receive antennas in a wireless MIMO communication system
US20100220797A1 (en) * 2007-08-28 2010-09-02 Hideo Namba Communication apparatus
US20100232384A1 (en) * 2009-03-13 2010-09-16 Qualcomm Incorporated Channel estimation based upon user specific and common reference signals
EP2234286A1 (en) * 2008-01-17 2010-09-29 Alcatel Lucent Method and apparatus for performing cyclic delay mapping to signals in multiple antenna transmitters
US20100246496A1 (en) * 2007-12-04 2010-09-30 Hiroyuki Yurugi Wireless communication system having mimo communication capability and having multiple receiving antennas to be selected
US20100246377A1 (en) * 2005-09-29 2010-09-30 Interdigital Technology Corporation Mimo beamforming-based single carrier frequency division multiple access system
US20100273438A1 (en) * 2006-06-05 2010-10-28 Panasonic Corporation Radio communication apparatus and radio communication method in multi-carrier communication
US20100284477A1 (en) * 2007-11-14 2010-11-11 Lg Electronics Inc. Method for transmitting signal in multiple antenna system
US20100329370A1 (en) * 2009-04-28 2010-12-30 Beceem Communications Inc. Selection of a Subset of Antennas for Transmission
US20110009079A1 (en) * 2004-09-27 2011-01-13 Naoki Okamoto Radio transmission device
US20110064156A1 (en) * 2006-09-05 2011-03-17 Lg Electronics Inc. Method of transmitting feedback information for precoding and precoding method
US20110110403A1 (en) * 2008-07-01 2011-05-12 Telefonaktiebolaget L M Ericsson (Publ) Methods and apparatus using precoding matrices in a mimo telecommunications system
US20110261841A1 (en) * 2008-12-31 2011-10-27 Seah Networks Co., Ltd. Transmission device and method using space-frequency transmission diversity
EP2385635A2 (en) * 2009-01-30 2011-11-09 LG Electronics Inc. Apparatus and method for transmitting a reference signal in a radio communication system
US20120004014A1 (en) * 2009-03-12 2012-01-05 Ming Ding Channel reconstruction method, base station and user equipment
CN102394676A (en) * 2011-06-30 2012-03-28 中兴通讯股份有限公司 Feedback method and terminal for precorrection information
US20120113840A1 (en) * 2010-10-04 2012-05-10 Vodafone Ip Licensing Limited Method and system for enhanced transmission in mobile communication networks
US20120122407A1 (en) * 2009-07-20 2012-05-17 Icera Inc. Adaptive transmission feedback
US20120155571A1 (en) * 2009-08-28 2012-06-21 Huawei Technologies Co., Ltd Method, apparatus, and system for data signal transmission in multi-antenna system
US20120201281A1 (en) * 2008-12-18 2012-08-09 Broadcom Corporation Method and System For Communication In A Wireless Orthogonal Frequency Division Multiplexing (OFDM) Communication System
US20130148634A1 (en) * 2011-12-13 2013-06-13 Telefonaktiebolaget L M Ericsson (Publ) Asymmetric Resource Sharing Using Stale Feedback
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
CN103607364A (en) * 2013-12-04 2014-02-26 北京邮电大学 Physical layer encryption method based on channel estimation of circulation delay diversity system
US8681764B2 (en) 2005-11-18 2014-03-25 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US8737506B1 (en) * 2010-12-29 2014-05-27 Sprint Communications Company L.P. Determination of transmit diversity transmission delays
US8831607B2 (en) 2006-01-05 2014-09-09 Qualcomm Incorporated Reverse link other sector communication
US8838051B1 (en) 2009-02-19 2014-09-16 Qualcomm Incorporated Transmitter beamforming power control
US8842619B2 (en) 2005-10-27 2014-09-23 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US9007263B2 (en) 2010-09-09 2015-04-14 Qualcomm Incorporated Phase rotation techniques in a multi-user wireless communication environment
EP2465208A4 (en) * 2009-08-14 2015-05-13 Ericsson Telefon Ab L M Antenna device
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US9143219B1 (en) * 2006-09-06 2015-09-22 Marvell International Ltd. Equal power output spatial spreading matrix for use in a wireless MIMO communication system
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9154969B1 (en) 2011-09-29 2015-10-06 Marvell International Ltd. Wireless device calibration for implicit transmit
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
CN105071842A (en) * 2015-07-07 2015-11-18 江苏中兴微通信息科技有限公司 One-spatial stream three-antenna or three-spatial stream four-antenna space diversity transmit-receive method and apparatus in SC-MIMO system
US9210651B2 (en) 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US9426012B2 (en) 2000-09-13 2016-08-23 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9661579B1 (en) 2013-05-03 2017-05-23 Marvell International Ltd. Per-tone power control in OFDM
US9660776B2 (en) 2005-08-22 2017-05-23 Qualcomm Incorporated Method and apparatus for providing antenna diversity in a wireless communication system
US9680555B2 (en) 2014-12-16 2017-06-13 Nokia Technologies Oy Apparatus and method for multiple antenna systems
US9843097B1 (en) 2013-07-08 2017-12-12 Marvell International Ltd. MIMO implicit beamforming techniques

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7940640B2 (en) * 2006-01-20 2011-05-10 Nortel Networks Limited Adaptive orthogonal scheduling for virtual MIMO system
JP5111524B2 (en) * 2007-02-14 2013-01-09 エルジー エレクトロニクス インコーポレイティド Data receiving method and the transceiver to support this use precoding phase shift based
KR101106372B1 (en) * 2006-11-06 2012-01-18 콸콤 인코포레이티드 Method and apparatus for a mimo transmission with layer permutation in a wireless communication system
US8374271B2 (en) * 2007-01-08 2013-02-12 Cisco Technology, Inc. Method and system for resizing a MIMO channel
CN101262265B (en) 2007-03-09 2011-09-21 中兴通讯股份有限公司 A delay diversity transmission and receiving method for time division duplex wireless communication system
WO2008126516A1 (en) * 2007-04-10 2008-10-23 Naoki Suehiro Transmitting method, transmitting device, receiving method, and receiving device
US8131218B2 (en) 2007-04-13 2012-03-06 General Dynamics C4 Systems, Inc. Methods and apparatus for wirelessly communicating signals that include embedded synchronization/pilot sequences
US8379752B2 (en) * 2008-03-19 2013-02-19 General Dynamics C4 Systems, Inc. Methods and apparatus for multiple-antenna communication of wireless signals with embedded synchronization/pilot sequences
US8331420B2 (en) * 2008-04-14 2012-12-11 General Dynamics C4 Systems, Inc. Methods and apparatus for multiple-antenna communication of wireless signals with embedded pilot signals
US8160177B2 (en) * 2007-06-25 2012-04-17 Samsung Electronics Co., Ltd. Transmit methods with delay diversity and space-frequency diversity
KR20090042140A (en) 2007-10-25 2009-04-29 한국전자통신연구원 Multi-antenna communication method and system thereof
CN104135312A (en) 2008-02-28 2014-11-05 苹果公司 Communicating a feedback data structure containing information identifying coding to be applied on wirelessly communicated signaling
CN101350801B (en) * 2008-03-20 2012-10-10 中兴通讯股份有限公司 Method for mapping down special pilot frequency and physical resource block of long loop prefix frame structure
KR101410603B1 (en) * 2008-06-24 2014-06-20 애플 인크. System and method for supporting multi-user antenna beamforming in a cellular network
US8451927B2 (en) * 2008-07-04 2013-05-28 Keio University Multicarrier communication system
KR101603338B1 (en) * 2008-08-11 2016-03-15 엘지전자 주식회사 Method and apparatus of transmitting information in wireless communication system
KR20100019947A (en) 2008-08-11 2010-02-19 엘지전자 주식회사 Method of transmitting information in wireless communication system
WO2010019019A3 (en) * 2008-08-14 2010-06-24 Samsung Electronics Co., Ltd. Method and apparatus for supporting multiple reference signals in ofdma communication systems
CN101729119B (en) * 2008-10-15 2014-06-11 中兴通讯股份有限公司 Adaptive switching method and system for downlink multi-input multi-output mode
ES2614605T3 (en) 2008-11-14 2017-06-01 Lg Electronics Inc. Method and apparatus for transmitting information in wireless communication system
WO2010056068A3 (en) 2008-11-14 2010-09-16 엘지전자주식회사 Method and apparatus for signal transmission in wireless communication system
EP2209220A1 (en) * 2009-01-19 2010-07-21 ST-Ericsson (France) SAS Process for beamforming data to be transmitted by a base station in a MU-MIMO system and apparatus for performing the same
KR20100091876A (en) 2009-02-11 2010-08-19 엘지전자 주식회사 Ue behavior for multi-antenna transmission
JP5410812B2 (en) * 2009-03-31 2014-02-05 三星電子株式会社Samsung Electronics Co.,Ltd. Wireless communication device, a wireless communication system, and direct wave of the reception timing detection method
US8908615B2 (en) * 2009-07-01 2014-12-09 Institute For Information Industry Base station, relay station, computing apparatus, and reference signal transmission, allocation, and receiving methods thereof
US8744009B2 (en) * 2009-09-25 2014-06-03 General Dynamics C4 Systems, Inc. Reducing transmitter-to-receiver non-linear distortion at a transmitter prior to estimating and cancelling known non-linear distortion at a receiver
US8355466B2 (en) * 2009-09-25 2013-01-15 General Dynamics C4 Systems, Inc. Cancelling non-linear power amplifier induced distortion from a received signal by moving incorrectly estimated constellation points
CN102035579B (en) 2009-09-28 2014-09-03 夏普株式会社 Information feedback method and user equipment
WO2011073252A1 (en) * 2009-12-18 2011-06-23 Nokia Siemens Networks Oy Reference signal resource randomization with su-mimo
CN101778072B (en) * 2010-01-25 2012-10-17 华为技术有限公司 Multicarrier and multi-antenna signal sending method and transmitter
US9806789B2 (en) * 2010-04-06 2017-10-31 Samsung Electronics Co., Ltd. Apparatus and method for spatial division duplex (SDD) for millimeter wave communication system
EP2385664A1 (en) * 2010-05-03 2011-11-09 Mitsubishi Electric R&D Centre Europe B.V. Method for transferring data and information enabling an estimate of a wireless link between a source and at least one receiver.
CN101854712A (en) * 2010-06-18 2010-10-06 华为技术有限公司 Method, device and base station for balancing powers betweenantennas
CN102299731B (en) * 2010-06-28 2016-06-29 中兴通讯股份有限公司 Transmitting means Ofdm System and method for cyclic delay diversity to improve performance
US8625689B2 (en) * 2010-07-09 2014-01-07 Texas Instruments Incorporated Time-domain link adaptation
JP6212121B2 (en) 2012-08-31 2017-10-11 エルジー エレクトロニクス インコーポレイティド Antenna virtualization method and apparatus in a wireless communication system
CN104753573B (en) * 2013-12-31 2018-05-01 中兴通讯股份有限公司 A method to realize space division multiplexing, system, base station and a terminal
US9867187B2 (en) * 2014-08-04 2018-01-09 Qualcomm Incorporated Techniques for configuring uplink channel transmissions using shared radio frequency spectrum band

Citations (100)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5594738A (en) * 1993-10-18 1997-01-14 Motorola, Inc. Time slot allocation method
US5604744A (en) * 1992-10-05 1997-02-18 Telefonaktiebolaget Lm Ericsson Digital control channels having logical channels for multiple access radiocommunication
US5726978A (en) * 1995-06-22 1998-03-10 Telefonaktiebolaget L M Ericsson Publ. Adaptive channel allocation in a frequency division multiplexed system
US5870393A (en) * 1995-01-20 1999-02-09 Hitachi, Ltd. Spread spectrum communication system and transmission power control method therefor
US6016123A (en) * 1994-02-16 2000-01-18 Northern Telecom Limited Base station antenna arrangement
US6038450A (en) * 1997-09-12 2000-03-14 Lucent Technologies, Inc. Soft handover system for a multiple sub-carrier communication system and method thereof
US6169910B1 (en) * 1994-12-30 2001-01-02 Focused Energy Holding Inc. Focused narrow beam communication system
US6175650B1 (en) * 1998-01-26 2001-01-16 Xerox Corporation Adaptive quantization compatible with the JPEG baseline sequential mode
US6176550B1 (en) * 1997-12-03 2001-01-23 Steelcase Development Inc. Adjustable armrest for chairs
US6198775B1 (en) * 1998-04-28 2001-03-06 Ericsson Inc. Transmit diversity method, systems, and terminals using scramble coding
US20020000948A1 (en) * 2000-03-08 2002-01-03 Samsung Electronics Co., Ltd. Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system
US6337657B1 (en) * 1999-03-12 2002-01-08 Topcon Positioning Systems, Inc. Methods and apparatuses for reducing errors in the measurement of the coordinates and time offset in satellite positioning system receivers
US20020015405A1 (en) * 2000-06-26 2002-02-07 Risto Sepponen Error correction of important fields in data packet communications in a digital mobile radio network
US20020018157A1 (en) * 1996-04-12 2002-02-14 Semiconductor Energy Laboratory Co., Ltd., A Japanese Corporation Liquid crystal display device and method for fabricating thereof
US6363060B1 (en) * 1999-06-30 2002-03-26 Qualcomm Incorporated Method and apparatus for fast WCDMA acquisition
US20030002464A1 (en) * 1997-09-16 2003-01-02 Ramin Rezaiifar Channel structure for communication systems
US6507601B2 (en) * 2000-02-09 2003-01-14 Golden Bridge Technology Collision avoidance
US20030020651A1 (en) * 2001-04-27 2003-01-30 Crilly William J. Wireless packet switched communication systems and networks using adaptively steered antenna arrays
US20030036359A1 (en) * 2001-07-26 2003-02-20 Dent Paul W. Mobile station loop-back signal processing
US20030040283A1 (en) * 2001-08-21 2003-02-27 Ntt Docomo, Inc. Radio communication system, communication terminal, and method for transmitting burst signals
US6529525B1 (en) * 2000-05-19 2003-03-04 Motorola, Inc. Method for supporting acknowledged transport layer protocols in GPRS/edge host application
US20030043764A1 (en) * 2001-08-23 2003-03-06 Samsung Electronics Co., Ltd. Method for allocating HARQ channel number for indicating state information in an HSDPA communication system
US20030043732A1 (en) * 2001-05-17 2003-03-06 Walton Jay R. Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission
US6535666B1 (en) * 1995-06-02 2003-03-18 Trw Inc. Method and apparatus for separating signals transmitted over a waveguide
US6539213B1 (en) * 1999-06-14 2003-03-25 Time Domain Corporation System and method for impulse radio power control
US6539008B1 (en) * 1997-11-03 2003-03-25 Samsung Electronics, Co., Ltd. Method for inserting power control bits in the CDMA mobile system
US20030073464A1 (en) * 2001-05-25 2003-04-17 Giannakis Georgios B. Space-time coded transmissions within a wireless communication network
US20040001429A1 (en) * 2002-06-27 2004-01-01 Jianglei Ma Dual-mode shared OFDM methods/transmitters, receivers and systems
US20040002364A1 (en) * 2002-05-27 2004-01-01 Olav Trikkonen Transmitting and receiving methods
US20040001460A1 (en) * 2002-06-26 2004-01-01 Bevan David Damian Nicholas Soft handoff method for uplink wireless communications
US6674787B1 (en) * 1999-05-19 2004-01-06 Interdigital Technology Corporation Raising random access channel packet payload
US6675012B2 (en) * 2001-03-08 2004-01-06 Nokia Mobile Phones, Ltd. Apparatus, and associated method, for reporting a measurement summary in a radio communication system
US6690951B1 (en) * 1999-12-20 2004-02-10 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic size allocation system and method
US6701165B1 (en) * 2000-06-21 2004-03-02 Agere Systems Inc. Method and apparatus for reducing interference in non-stationary subscriber radio units using flexible beam selection
US6704571B1 (en) * 2000-10-17 2004-03-09 Cisco Technology, Inc. Reducing data loss during cell handoffs
US20040048609A1 (en) * 2000-12-11 2004-03-11 Minoru Kosaka Radio communication system
US6711400B1 (en) * 1997-04-16 2004-03-23 Nokia Corporation Authentication method
US20040058687A1 (en) * 2002-09-06 2004-03-25 Samsung Electronics Co., Ltd. Apparatus and method for transmitting CQI information in a CDMA communication system employing an HSDPA scheme
US20050002440A1 (en) * 1997-02-24 2005-01-06 Siavash Alamouti Vertical adaptive antenna array for a discrete multitone spread spectrum communications system
US20050003782A1 (en) * 2003-06-06 2005-01-06 Ola Wintzell Methods and apparatus for channel quality indicator determination
US20050002412A1 (en) * 2001-11-15 2005-01-06 Mats Sagfors Method and system of retransmission
US20050002468A1 (en) * 2001-05-11 2005-01-06 Walton Jay R. Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
US6842487B1 (en) * 2000-09-22 2005-01-11 Telefonaktiebolaget Lm Ericsson (Publ) Cyclic delay diversity for mitigating intersymbol interference in OFDM systems
US20050009486A1 (en) * 1999-10-08 2005-01-13 Naofal Al-Dhahir Finite-length equalization overmulti-input multi-output channels
US20050008091A1 (en) * 2003-06-26 2005-01-13 Mitsubishi Denki Kabushiki Kaisha Sphere decoding of symbols transmitted in a telecommunication system
US20050013263A1 (en) * 2003-01-04 2005-01-20 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving uplink data retransmission request in a CDMA communication system
US6850509B2 (en) * 2000-02-01 2005-02-01 Samsung Electronics Co., Ltd. Scheduling apparatus and method for packet data service in a wireless communication system
US6850481B2 (en) * 2000-09-01 2005-02-01 Nortel Networks Limited Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system
US20050034079A1 (en) * 2003-08-05 2005-02-10 Duraisamy Gunasekar Method and system for providing conferencing services
US20050030886A1 (en) * 2003-08-07 2005-02-10 Shiquan Wu OFDM system and method employing OFDM symbols with known or information-containing prefixes
US20050041775A1 (en) * 2003-08-22 2005-02-24 Batzinger Thomas J. High speed digital radiographic inspection of piping
US20050044206A1 (en) * 2001-09-07 2005-02-24 Staffan Johansson Method and arrangements to achieve a dynamic resource distribution policy in packet based communication networks
US20050041618A1 (en) * 2003-08-05 2005-02-24 Yongbin Wei Extended acknowledgement and rate control channel
US20050047517A1 (en) * 2003-09-03 2005-03-03 Georgios Giannakis B. Adaptive modulation for multi-antenna transmissions with partial channel knowledge
US20050053151A1 (en) * 2003-09-07 2005-03-10 Microsoft Corporation Escape mode code resizing for fields and slices
US20050053081A1 (en) * 1999-11-17 2005-03-10 Telefonaktiebolaget Lm Ericsson (Publ) Acceleration dependent channel switching in mobile telecommunications
US20050052991A1 (en) * 2003-09-09 2005-03-10 Tamer Kadous Incremental redundancy transmission in a MIMO communication system
US6985434B2 (en) * 2000-09-01 2006-01-10 Nortel Networks Limited Adaptive time diversity and spatial diversity for OFDM
US6985466B1 (en) * 1999-11-09 2006-01-10 Arraycomm, Inc. Downlink signal processing in CDMA systems utilizing arrays of antennae
US6985498B2 (en) * 2002-08-26 2006-01-10 Flarion Technologies, Inc. Beacon signaling in a wireless system
US6985453B2 (en) * 2001-02-15 2006-01-10 Qualcomm Incorporated Method and apparatus for link quality feedback in a wireless communication system
US6987746B1 (en) * 1999-03-15 2006-01-17 Lg Information & Communications, Ltd. Pilot signals for synchronization and/or channel estimation
US20060013285A1 (en) * 2004-07-16 2006-01-19 Takahiro Kobayashi Radio communication apparatus, base station and system
US20060018336A1 (en) * 2004-07-21 2006-01-26 Arak Sutivong Efficient signaling over access channel
US20060018347A1 (en) * 2004-07-21 2006-01-26 Avneesh Agrawal Shared signaling channel for a communication system
US20060018397A1 (en) * 2004-07-21 2006-01-26 Qualcomm Incorporated Capacity based rank prediction for MIMO design
US20060029289A1 (en) * 2004-08-05 2006-02-09 Kabushiki Kaisha Toshiba Information processing apparatus and method for detecting scene change
US20060034173A1 (en) * 2004-07-21 2006-02-16 Qualcomm Incorporated Method of providing a gap indication during a sticky assignment
US7002900B2 (en) * 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US20060039500A1 (en) * 2004-08-17 2006-02-23 Samsung Electronics Co., Ltd. Apparatus and method for space-time-frequency block coding for increasing performance
US20060039344A1 (en) * 2004-08-20 2006-02-23 Lucent Technologies, Inc. Multiplexing scheme for unicast and broadcast/multicast traffic
US20060039332A1 (en) * 2004-08-17 2006-02-23 Kotzin Michael D Mechanism for hand off using subscriber detection of synchronized access point beacon transmissions
US7006848B2 (en) * 2001-03-23 2006-02-28 Qualcomm Incorporated Method and apparatus for utilizing channel state information in a wireless communication system
US20060045003A1 (en) * 2004-08-26 2006-03-02 Samsung Electronics Co., Ltd. Method for detecting initial operation mode in wireless communication system employing OFDMA scheme
US20060050770A1 (en) * 2004-09-03 2006-03-09 Qualcomm Incorporated Receiver structures for spatial spreading with space-time or space-frequency transmit diversity
US7157351B2 (en) * 2004-05-20 2007-01-02 Taiwan Semiconductor Manufacturing Co., Ltd. Ozone vapor clean method
US20070005749A1 (en) * 2005-06-16 2007-01-04 Qualcomm Incorporated Robust rank perdiction for a MIMO system
US20070004430A1 (en) * 2005-07-04 2007-01-04 Samsung Electronics Co., Ltd. Position measuring system and method using wireless broadband (WIBRO) signal
US7164649B2 (en) * 2001-11-02 2007-01-16 Qualcomm, Incorporated Adaptive rate control for OFDM communication system
US7164696B2 (en) * 2000-07-26 2007-01-16 Mitsubishi Denki Kabushiki Kaisha Multi-carrier CDMA communication device, multi-carrier CDMA transmitting device, and multi-carrier CDMA receiving device
US20070019596A1 (en) * 2005-06-16 2007-01-25 Barriac Gwendolyn D Link assignment messages in lieu of assignment acknowledgement messages
US7170937B2 (en) * 2002-05-01 2007-01-30 Texas Instruments Incorporated Complexity-scalable intra-frame prediction technique
US20070025345A1 (en) * 2005-07-27 2007-02-01 Bachl Rainer W Method of increasing the capacity of enhanced data channel on uplink in a wireless communications systems
US7177297B2 (en) * 2003-05-12 2007-02-13 Qualcomm Incorporated Fast frequency hopping with a code division multiplexed pilot in an OFDMA system
US7177351B2 (en) * 2002-03-01 2007-02-13 Qualcomm, Incorporated Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system
US7181170B2 (en) * 2003-12-22 2007-02-20 Motorola Inc. Apparatus and method for adaptive broadcast transmission
US20070041311A1 (en) * 2005-08-18 2007-02-22 Baum Kevin L Method and apparatus for pilot signal transmission
US7184713B2 (en) * 2002-06-20 2007-02-27 Qualcomm, Incorporated Rate control for multi-channel communication systems
US20070110172A1 (en) * 2003-12-03 2007-05-17 Australian Telecommunications Cooperative Research Channel estimation for ofdm systems
US20090022098A1 (en) * 2005-10-21 2009-01-22 Robert Novak Multiplexing schemes for ofdma
US7483779B2 (en) * 2004-02-03 2009-01-27 Jungheinrich Aktiengesellschaft Method for the adjustment of the control current of current-controlled hydraulic valves
US7483719B2 (en) * 2003-11-13 2009-01-27 Samsung Electronics Co., Ltd. Method for grouping transmission antennas in mobile communication system including multiple transmission/reception antennas
US20090041150A1 (en) * 2007-08-09 2009-02-12 Jiann-An Tsai Method and apparatus of codebook-based single-user closed-loop transmit beamforming (SU-CLTB) for OFDM wireless systems
US7492788B2 (en) * 2001-06-27 2009-02-17 Nortel Networks Limited Communication of control information in wireless communication systems
US20100002570A9 (en) * 2004-02-18 2010-01-07 Walton J R Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US7664061B2 (en) * 2001-09-05 2010-02-16 Nokia Corporation Closed-loop signaling method for controlling multiple transmit beams and correspondingly adapted transceiver device
US7676007B1 (en) * 2004-07-21 2010-03-09 Jihoon Choi System and method for interpolation based transmit beamforming for MIMO-OFDM with partial feedback
US20120002623A1 (en) * 2005-10-27 2012-01-05 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8095141B2 (en) * 2005-03-09 2012-01-10 Qualcomm Incorporated Use of supplemental assignments
US8098568B2 (en) * 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system

Family Cites Families (843)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393276A (en) 1981-03-19 1983-07-12 Bell Telephone Laboratories, Incorporated Fourier masking analog signal secure communication system
FR2527871B1 (en) 1982-05-27 1986-04-11 Thomson Csf Radio system, a frequency hopping
FR2584884B1 (en) 1985-07-09 1987-10-09 Trt Telecom Radio Electr Method and free channel search device for a mobile radio system
JPH0439927B2 (en) 1985-07-16 1992-07-01 Kokusai Denshin Denwa Co Ltd
GB2180127B (en) 1985-09-04 1989-08-23 Philips Electronic Associated Method of data communication
JPS6290045A (en) 1985-10-16 1987-04-24 Kokusai Denshin Denwa Co Ltd <Kdd> Frequency assignment system in fdma communication system
JPH028725A (en) 1988-06-27 1990-01-12 Toshiba Corp Leak detector
JPH0331342A (en) 1989-06-28 1991-02-12 Mitsubishi Petrochem Co Ltd Polyolefin resin composition
US5008900A (en) 1989-08-14 1991-04-16 International Mobile Machines Corporation Subscriber unit for wireless digital subscriber communication system
JPH0382148A (en) 1989-08-25 1991-04-08 Hitachi Ltd Semiconductor device
FR2652452B1 (en) 1989-09-26 1992-03-20 Europ Agence Spatiale A feeding device of a multi-beam antenna.
JPH0484200A (en) 1990-07-27 1992-03-17 Nec Corp Multipulse voice coding method
JPH04111544A (en) 1990-08-31 1992-04-13 Nippon Telegr & Teleph Corp <Ntt> Radio channel assigning method
US5257399A (en) 1990-11-28 1993-10-26 Telefonaktiebolaget L M Ericsson Multiple access handling in a cellular communications system
JP2807771B2 (en) 1991-03-28 1998-10-08 キヤノン株式会社 Wireless telephone systems and wireless communication device
US5253270A (en) 1991-07-08 1993-10-12 Hal Communications Apparatus useful in radio communication of digital data using minimal bandwidth
US5592490A (en) 1991-12-12 1997-01-07 Arraycomm, Inc. Spectrally efficient high capacity wireless communication systems
US5455839A (en) 1991-12-27 1995-10-03 Motorola, Inc. Device and method for precoding
JP2904986B2 (en) 1992-01-31 1999-06-14 日本放送協会 Orthogonal frequency division multiplexing digital signal transmitting apparatus and receiving apparatus
US5384810A (en) 1992-02-05 1995-01-24 At&T Bell Laboratories Modulo decoder
US5363408A (en) 1992-03-24 1994-11-08 General Instrument Corporation Mode selective quadrature amplitude modulation communication system
US5282222A (en) 1992-03-31 1994-01-25 Michel Fattouche Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum
GB9209027D0 (en) 1992-04-25 1992-06-17 British Aerospace Multi purpose digital signal regenerative processing apparatus
US5268694A (en) 1992-07-06 1993-12-07 Motorola, Inc. Communication system employing spectrum reuse on a spherical surface
FR2693861A1 (en) 1992-07-16 1994-01-21 Philips Electronique Lab division multiplexed signal receiver orthogonal frequency with a frequency synchronizing device.
US5768276A (en) 1992-10-05 1998-06-16 Telefonaktiebolaget Lm Ericsson Digital control channels having logical channels supporting broadcast SMS
US5404355A (en) 1992-10-05 1995-04-04 Ericsson Ge Mobile Communications, Inc. Method for transmitting broadcast information in a digital control channel
JP2942913B2 (en) 1993-06-10 1999-08-30 ケイディディ株式会社 Partner authentication / encryption key distribution scheme
KR100191295B1 (en) 1993-06-18 1999-06-15 러셀 비. 밀러 Method and apparatus for determining data rate of transmitted variable rate data in a communication receiver
JPH0746248A (en) 1993-07-30 1995-02-14 Toshiba Corp Radio communication system
GB9320556D0 (en) 1993-10-06 1993-11-24 Unilever Plc Hair conditioning composition
CA2150542C (en) 1993-10-28 2004-01-20 Klein S. Gilhousen Method and apparatus for performing handoff between sectors of a common base station
US5603081A (en) 1993-11-01 1997-02-11 Telefonaktiebolaget Lm Ericsson Method for communicating in a wireless communication system
US5410538A (en) 1993-11-09 1995-04-25 At&T Corp. Method and apparatus for transmitting signals in a multi-tone code division multiple access communication system
EP0660559B1 (en) 1993-12-22 2005-04-27 Philips Electronics N.V. Multicarrier frequency-hopping communication system
US5465253A (en) 1994-01-04 1995-11-07 Motorola, Inc. Method and apparatus for demand-assigned reduced-rate out-of-band signaling channel
US5469471A (en) 1994-02-01 1995-11-21 Qualcomm Incorporated Method and apparatus for providing a communication link quality indication
US5513379A (en) 1994-05-04 1996-04-30 At&T Corp. Apparatus and method for dynamic resource allocation in wireless communication networks utilizing ordered borrowing
JPH07336323A (en) 1994-06-10 1995-12-22 Oki Electric Ind Co Ltd Code division multiple access equipment
US5603096A (en) 1994-07-11 1997-02-11 Qualcomm Incorporated Reverse link, closed loop power control in a code division multiple access system
US5490139A (en) 1994-09-28 1996-02-06 International Business Machines Corporation Mobility enabling access point architecture for wireless attachment to source routing networks
US5583869A (en) 1994-09-30 1996-12-10 Motorola, Inc. Method for dynamically allocating wireless communication resources
EP0788688B1 (en) 1994-10-27 2004-01-21 International Business Machines Corporation Method and apparatus for secure identification of a mobile user in a communication network
JP3437291B2 (en) 1994-11-14 2003-08-18 キヤノン株式会社 Playback apparatus and method
US5684491A (en) 1995-01-27 1997-11-04 Hazeltine Corporation High gain antenna systems for cellular use
JPH08288927A (en) 1995-04-17 1996-11-01 Oki Electric Ind Co Ltd Spread spectrum communication system and spread spectrum communication equipment
DE69534445D1 (en) 1995-04-28 2005-10-20 Alcatel Sa A method for TDMA administration, central station, subscriber station and network for implementing the method
US5612978A (en) 1995-05-30 1997-03-18 Motorola, Inc. Method and apparatus for real-time adaptive interference cancellation in dynamic environments
US6018317A (en) 1995-06-02 2000-01-25 Trw Inc. Cochannel signal processing system
US6215983B1 (en) 1995-06-02 2001-04-10 Trw Inc. Method and apparatus for complex phase equalization for use in a communication system
JP3073666B2 (en) 1995-06-21 2000-08-07 モトローラ株式会社 Preamble synchronous communication system utilizing for additional information transmitting preamble
FI99252C (en) 1995-07-03 1997-12-29 Nokia Mobile Phones Ltd Connected to the radio signal modulation and multiple access method
US6154484A (en) 1995-09-06 2000-11-28 Solana Technology Development Corporation Method and apparatus for embedding auxiliary data in a primary data signal using frequency and time domain processing
US5815488A (en) 1995-09-28 1998-09-29 Cable Television Laboratories, Inc. Multiple user access method using OFDM
JP3639364B2 (en) 1995-11-08 2005-04-20 オリンパス株式会社 The ultrasonic diagnostic apparatus
JPH09139725A (en) 1995-11-16 1997-05-27 Matsushita Electric Ind Co Ltd Multiplex communication equipment
EP0774850B1 (en) 1995-11-16 2004-10-27 Ntt Mobile Communications Network Inc. Digital signal detecting method and detector
US5887023A (en) 1995-11-29 1999-03-23 Nec Corporation Method and apparatus for a frequency hopping-spread spectrum communication system
US5815116A (en) 1995-11-29 1998-09-29 Trw Inc. Personal beam cellular communication system
JP2812318B2 (en) 1995-11-29 1998-10-22 日本電気株式会社 Spread spectrum communication method and apparatus
KR0150275B1 (en) 1995-12-22 1998-11-02 양승택 Congestion control method for multicast communication
EP0786889B1 (en) 1996-02-02 2002-04-17 Deutsche Thomson-Brandt Gmbh Method for the reception of multicarrier signals and related apparatus
US6088592A (en) 1996-03-25 2000-07-11 Airnet Communications Corporation Wireless system plan using in band-translators with diversity backhaul to enable efficient depolyment of high capacity base transceiver systems
US6134215A (en) 1996-04-02 2000-10-17 Qualcomm Incorpoated Using orthogonal waveforms to enable multiple transmitters to share a single CDM channel
US5822368A (en) 1996-04-04 1998-10-13 Lucent Technologies Inc. Developing a channel impulse response by using distortion
JPH09284200A (en) 1996-04-10 1997-10-31 Mitsubishi Electric Corp Radio communication equipment and radio communication method
GB9609148D0 (en) 1996-05-01 1996-07-03 Plessey Telecomm Multi-party communication
US5790537A (en) 1996-05-15 1998-08-04 Mcgill University Interference suppression in DS-CDMA systems
EP0807989B1 (en) 1996-05-17 2001-06-27 Motorola Ltd Devices for transmitter path weights and methods therefor
US5926470A (en) 1996-05-22 1999-07-20 Qualcomm Incorporated Method and apparatus for providing diversity in hard handoff for a CDMA system
GB9611146D0 (en) 1996-05-29 1996-07-31 Philips Electronics Nv Method of, and system for, transmitting messages
US5732113A (en) 1996-06-20 1998-03-24 Stanford University Timing and frequency synchronization of OFDM signals
CN1089507C (en) 1996-06-28 2002-08-21 三星电子株式会社 Mothod for controlling transmitting power of mobile station
US6058309A (en) 1996-08-09 2000-05-02 Nortel Networks Corporation Network directed system selection for cellular and PCS enhanced roaming
US6141317A (en) 1996-08-22 2000-10-31 Tellabs Operations, Inc. Apparatus and method for bandwidth management in a multi-point OFDM/DMT digital communications system
US6233456B1 (en) 1996-09-27 2001-05-15 Qualcomm Inc. Method and apparatus for adjacent coverage area handoff in communication systems
JP3444114B2 (en) 1996-11-22 2003-09-08 ソニー株式会社 Communication method, a base station and a terminal device
US5956642A (en) 1996-11-25 1999-09-21 Telefonaktiebolaget L M Ericsson Adaptive channel allocation method and apparatus for multi-slot, multi-carrier communication system
US6061337A (en) 1996-12-02 2000-05-09 Lucent Technologies Inc. System and method for CDMA handoff using telemetry to determine the need for handoff and to select the destination cell site
EP0848563A3 (en) 1996-12-11 2000-01-05 Texas Instruments Incorporated Improvements in or relating to telecommunication systems
KR100221336B1 (en) 1996-12-28 1999-09-15 전주범 Frame harmonic apparatus and method of multi-receiver system
US5953325A (en) 1997-01-02 1999-09-14 Telefonaktiebolaget L M Ericsson (Publ) Forward link transmission mode for CDMA cellular communications system using steerable and distributed antennas
US6232918B1 (en) 1997-01-08 2001-05-15 Us Wireless Corporation Antenna array calibration in wireless communication systems
US6173007B1 (en) 1997-01-15 2001-01-09 Qualcomm Inc. High-data-rate supplemental channel for CDMA telecommunications system
US5933421A (en) 1997-02-06 1999-08-03 At&T Wireless Services Inc. Method for frequency division duplex communications
US5920571A (en) 1997-02-07 1999-07-06 Lucent Technologies Inc. Frequency channel and time slot assignments in broadband access networks
US6335922B1 (en) 1997-02-11 2002-01-01 Qualcomm Incorporated Method and apparatus for forward link rate scheduling
EP0925693A4 (en) 1997-02-21 2002-01-02 Motorola Inc Method and apparatus for allocating spectral resources in a wireless communication system
US5838268A (en) 1997-03-14 1998-11-17 Orckit Communications Ltd. Apparatus and methods for modulation and demodulation of data
US5974310A (en) 1997-03-20 1999-10-26 Omnipoint Corporation Communication control for a user of a central communication center
FI104610B (en) 1997-03-27 2000-02-29 Nokia Networks Oy The control channel allocation in a packet radio network
US6175550B1 (en) 1997-04-01 2001-01-16 Lucent Technologies, Inc. Orthogonal frequency division multiplexing system with dynamically scalable operating parameters and method thereof
KR100242421B1 (en) 1997-04-14 2000-02-01 윤종용 Method for assigning pilot pn offset of digital mobile communication system
US6076114A (en) 1997-04-18 2000-06-13 International Business Machines Corporation Methods, systems and computer program products for reliable data transmission over communications networks
FI105136B (en) 1997-04-21 2000-06-15 Nokia Mobile Phones Ltd General packet radio service
FI104939B (en) 1997-04-23 2000-04-28 Nokia Networks Oy Signaling implementation of a communications network
CA2286300C (en) 1997-04-24 2006-06-13 Ntt Mobile Communications Network Inc. Mobile diversity handover and branch control
KR100241894B1 (en) 1997-05-07 2000-02-01 윤종용 Software managing method in cdma base station system of personal communication system
US6075814A (en) 1997-05-09 2000-06-13 Broadcom Homenetworking, Inc. Method and apparatus for reducing signal processing requirements for transmitting packet-based data with a modem
JP2879030B2 (en) 1997-05-16 1999-04-05 株式会社東芝 Ofdm transmitter and a receiver and ofdm transmission method and receiving method
FI105063B (en) 1997-05-16 2000-05-31 Nokia Networks Oy Method for determining the transmitting direction of the radio system, and
US6374115B1 (en) 1997-05-28 2002-04-16 Transcrypt International/E.F. Johnson Method and apparatus for trunked radio repeater communications with backwards compatibility
US6111865A (en) 1997-05-30 2000-08-29 Qualcomm Incorporated Dual channel slotted paging
WO1998054919A3 (en) 1997-05-30 1999-03-04 Qualcomm Inc Paging a wireless terminal in a wireless telecommunications system
US6052364A (en) 1997-06-13 2000-04-18 Comsat Corporation CDMA system architecture for satcom terminals
CN1132474C (en) 1997-06-13 2003-12-24 艾利森电话股份有限公司 Distributed cellular radio communication system, a physical control channel multiplexing
US6151296A (en) 1997-06-19 2000-11-21 Qualcomm Incorporated Bit interleaving for orthogonal frequency division multiplexing in the transmission of digital signals
US5867478A (en) 1997-06-20 1999-02-02 Motorola, Inc. Synchronous coherent orthogonal frequency division multiplexing system, method, software and device
US6240129B1 (en) 1997-07-10 2001-05-29 Alcatel Method and windowing unit to reduce leakage, fourier transformer and DMT modem wherein the unit is used
US5852630A (en) 1997-07-17 1998-12-22 Globespan Semiconductor, Inc. Method and apparatus for a RADSL transceiver warm start activation procedure with precoding
US6038263A (en) 1997-07-31 2000-03-14 Motorola, Inc. Method and apparatus for transmitting signals in a communication system
US6307849B1 (en) 1997-09-08 2001-10-23 Qualcomm Incorporated Method and system for changing forward traffic channel power allocation during soft handoff
KR100365346B1 (en) 1997-09-09 2002-12-06 삼성전자 주식회사 Apparatus and method for generating quasi-orthogonal code of mobile communication system and diffusing band by using quasi-orthogonal code
US6577739B1 (en) 1997-09-19 2003-06-10 University Of Iowa Research Foundation Apparatus and methods for proportional audio compression and frequency shifting
US6058105A (en) * 1997-09-26 2000-05-02 Lucent Technologies Inc. Multiple antenna communication system and method thereof
US6075797A (en) 1997-10-17 2000-06-13 3Com Corporation Method and system for detecting mobility of a wireless-capable modem to minimize data transfer rate renegotiations
US7184426B2 (en) 2002-12-12 2007-02-27 Qualcomm, Incorporated Method and apparatus for burst pilot for a time division multiplex system
US6000054A (en) 1997-11-03 1999-12-07 Motorola, Inc. Method and apparatus for encoding and decoding binary information using restricted coded modulation and parallel concatenated convolution codes
US5995992A (en) 1997-11-17 1999-11-30 Bull Hn Information Systems Inc. Conditional truncation indicator control for a decimal numeric processor employing result truncation
US6108323A (en) 1997-11-26 2000-08-22 Nokia Mobile Phones Limited Method and system for operating a CDMA cellular system having beamforming antennas
US6067315A (en) 1997-12-04 2000-05-23 Telefonaktiebolaget Lm Ericsson Method and apparatus for coherently-averaged power estimation
US6563806B1 (en) 1997-12-12 2003-05-13 Hitachi, Ltd. Base station for multi-carrier TDMA mobile communication system and method for assigning communication channels
US6359923B1 (en) 1997-12-18 2002-03-19 At&T Wireless Services, Inc. Highly bandwidth efficient communications
US6393008B1 (en) 1997-12-23 2002-05-21 Nokia Movile Phones Ltd. Control structures for contention-based packet data services in wideband CDMA
JPH11191756A (en) 1997-12-25 1999-07-13 Nec Corp Equipment and method for data communication with phs (r)
JPH11196109A (en) 1997-12-26 1999-07-21 Canon Inc Radio information communication system
DE19800953C1 (en) 1998-01-13 1999-07-29 Siemens Ag Resource allocation in radio interface of radio communications system
US6084919A (en) 1998-01-30 2000-07-04 Motorola, Inc. Communication unit having spectral adaptability
US7418043B2 (en) 2000-07-19 2008-08-26 Lot 41 Acquisition Foundation, Llc Software adaptable high performance multicarrier transmission protocol
US5955992A (en) 1998-02-12 1999-09-21 Shattil; Steve J. Frequency-shifted feedback cavity used as a phased array antenna controller and carrier interference multiple access spread-spectrum transmitter
KR100290679B1 (en) 1998-02-14 2001-03-05 윤종용 Apparatus and method for communicating system having dedicated control channel
JP3589851B2 (en) 1998-02-20 2004-11-17 株式会社日立製作所 Packet communication system and a packet communication device
DE59907450D1 (en) 1998-02-27 2003-11-27 Siemens Ag Telecommunication systems with wireless, based on code- and time-multiplex telecommunication
JP3199020B2 (en) 1998-02-27 2001-08-13 日本電気株式会社 Encoding apparatus and decoding apparatus of an audio music signal
EP1059012A1 (en) 1998-02-27 2000-12-13 Siemens Aktiengesellschaft Telecommunications system with wireless code and time-division multiplex based telecommuncation between mobile and/or stationary transmitting/receiving devices
DE29924422U1 (en) 1998-03-14 2003-03-13 Samsung Electronics Co Ltd Multiple length frame message exchange in CDMA communication system
RU2210864C2 (en) 1998-03-23 2003-08-20 Самсунг Электроникс Ко., Лтд. Device and method for power regulation to control return-line common-user channel in cdma communication system
EP2285054A1 (en) 1998-04-03 2011-02-16 Tellabs Operations, Inc. Filter for impulse response shortening, with additional spectral constraints, for multicarrier transmission
US6112094A (en) 1998-04-06 2000-08-29 Ericsson Inc. Orthogonal frequency hopping pattern re-use scheme
JPH11298954A (en) 1998-04-08 1999-10-29 Hitachi Ltd Method and system for radio communication
US6353620B1 (en) 1998-04-09 2002-03-05 Ericsson Inc. System and method for facilitating inter-nodal protocol agreement in a telecommunications
DE69905242T2 (en) 1998-04-21 2003-09-11 Thomson Multimedia Sa A method for transmission in a home communication network with a wireless communication channel
US6567425B1 (en) 1998-04-23 2003-05-20 Telefonaktiebolaget Lm Ericsson (Publ) Bearer independent signaling protocol
US6075350A (en) 1998-04-24 2000-06-13 Lockheed Martin Energy Research Corporation Power line conditioner using cascade multilevel inverters for voltage regulation, reactive power correction, and harmonic filtering
JP3955680B2 (en) 1998-05-12 2007-08-08 株式会社エヌ・ティ・ティ・ドコモ Time division radio channel access method in a mobile communication system of the communication system, a base station and mobile station that use the method
KR100383575B1 (en) 1998-05-12 2003-04-29 삼성전자주식회사 Spreading modulation method for reducing peak to average power ratio in transmission power of terminal, and apparatus therefor
WO1999059265A1 (en) 1998-05-12 1999-11-18 Samsung Electronics Co., Ltd. Device and method for reducing the peak-to-average power ratio of a mobile station's transmit power
GB9810424D0 (en) 1998-05-14 1998-07-15 Fujitsu Ltd Soft hand-off in cellular mobile communications networks
US6643275B1 (en) 1998-05-15 2003-11-04 Telefonaktiebolaget Lm Ericsson (Publ) Random access in a mobile telecommunications system
KR100291476B1 (en) 1998-05-25 2001-03-13 윤종용 A method and a system for controlling a pilot measurement request order in cellular system
US6222832B1 (en) 1998-06-01 2001-04-24 Tantivy Communications, Inc. Fast Acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system
JP2000004215A (en) 1998-06-16 2000-01-07 Matsushita Electric Ind Co Ltd Transmission/reception system
JP3092798B2 (en) 1998-06-30 2000-09-25 日本電気株式会社 Adaptive transmitter-receiver
DE19829709A1 (en) 1998-07-03 2000-01-05 Beiersdorf Ag Preparations for protecting the skin from dermatitis infants ammoniacalis
JP2000022618A (en) 1998-07-03 2000-01-21 Hitachi Ltd Base station and control method for antenna beam
RU2141706C1 (en) 1998-07-06 1999-11-20 Военная академия связи Method and device for adaptive spatial filtering of signals
DE69929029T2 (en) 1998-07-07 2006-06-22 Samsung Electronics Co., Ltd., Suwon Method and apparatus for correction of a CDMA communication system in kodeinterferenz
US6563881B1 (en) 1998-07-13 2003-05-13 Sony Corporation Communication method and transmitter with transmission symbols arranged at intervals on a frequency axis
JP3449985B2 (en) 1998-07-16 2003-09-22 サムスン エレクトロニクス カンパニー リミテッド Packet data processing system and method of a mobile communication system
US6636525B1 (en) 1998-08-19 2003-10-21 International Business Machines Corporation Destination dependent coding for discrete multi-tone modulation
KR100429540B1 (en) 1998-08-26 2004-08-09 삼성전자주식회사 Packet data in a mobile communication system, communication apparatus and method
US6798736B1 (en) 1998-09-22 2004-09-28 Qualcomm Incorporated Method and apparatus for transmitting and receiving variable rate data
JP2000102065A (en) 1998-09-24 2000-04-07 Toshiba Corp Radio communication base station unit
US6501810B1 (en) 1998-10-13 2002-12-31 Agere Systems Inc. Fast frame synchronization
CA2282942A1 (en) 1998-11-09 2000-05-09 Adam L. Berenzweig Efficient authentication with key update
US6542485B1 (en) 1998-11-25 2003-04-01 Lucent Technologies Inc. Methods and apparatus for wireless communication using time division duplex time-slotted CDMA
US6473399B1 (en) 1998-11-30 2002-10-29 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for determining an optimum timeout under varying data rates in an RLC wireless system which uses a PDU counter
US6590881B1 (en) 1998-12-04 2003-07-08 Qualcomm, Incorporated Method and apparatus for providing wireless communication system synchronization
DE69815113T2 (en) 1998-12-04 2004-04-08 Lucent Technologies Inc. Error concealment and correction for voice, image and video signals
EP1053605B1 (en) 1998-12-07 2007-02-14 Samsung Electronics Co., Ltd. Device and method for gating transmission in a cdma mobile communication system
JP2000184425A (en) 1998-12-15 2000-06-30 Toshiba Corp Radio communication base station equipment
WO2000036776A1 (en) 1998-12-17 2000-06-22 Mitsubishi Denki Kabushiki Kaisha Transmitting method and transmitting device
US6654429B1 (en) 1998-12-31 2003-11-25 At&T Corp. Pilot-aided channel estimation for OFDM in wireless systems
GB2345612B (en) 1998-12-31 2003-09-03 Nokia Mobile Phones Ltd Measurement report transmission in a telecommunications system
US6452916B1 (en) 1999-01-04 2002-09-17 Lucent Technologies Inc. Space-time spreading method of CDMA wireless communication
EP1018827B1 (en) 1999-01-08 2004-05-06 Sony International (Europe) GmbH Synchronisation structure for OFDM system
US7453801B2 (en) 2001-11-08 2008-11-18 Qualcomm Incorporated Admission control and resource allocation in a communication system supporting application flows having quality of service requirements
US6393012B1 (en) 1999-01-13 2002-05-21 Qualcomm Inc. System for allocating resources in a communication system
US6229795B1 (en) 1999-01-13 2001-05-08 Qualcomm Incorporated System for allocating resources in a communication system
EP1021019A1 (en) 1999-01-15 2000-07-19 Sony International (Europe) GmbH Quasi-differential modulation/demodulation method for multi-amplitude digital modulated signals and OFDM system
US6584140B1 (en) 1999-01-22 2003-06-24 Systems Information And Electronic Systems Integration Inc. Spectrum efficient fast frequency-hopped modem with coherent demodulation
US6160651A (en) 1999-01-25 2000-12-12 Telcordia Technologies, Inc. Optical layer survivability and security system using optical label switching and high-speed optical header reinsertion
US6388998B1 (en) 1999-02-04 2002-05-14 Lucent Technologies Inc. Reuse of codes and spectrum in a CDMA system with multiple-sector cells
US6256478B1 (en) 1999-02-18 2001-07-03 Eastman Kodak Company Dynamic packet sizing in an RF communications system
US6597746B1 (en) 1999-02-18 2003-07-22 Globespanvirata, Inc. System and method for peak to average power ratio reduction
CA2262315A1 (en) 1999-02-19 2000-08-19 Wen Tong Joint optimal power balance for coded/tdm constituent data channels
US6259918B1 (en) 1999-02-26 2001-07-10 Telefonaktiebolaget Lm (Publ) Preservation of cell borders at hand-off within a smart antenna cellular system
US6317435B1 (en) 1999-03-08 2001-11-13 Qualcomm Incorporated Method and apparatus for maximizing the use of available capacity in a communication system
US6487243B1 (en) 1999-03-08 2002-11-26 International Business Machines Corporation Modems, methods, and computer program products for recovering from errors in a tone reversal sequence between two modems
US6693952B1 (en) 1999-03-16 2004-02-17 Lucent Technologies Inc. Dynamic code allocation for downlink shared channels
KR20000060428A (en) 1999-03-16 2000-10-16 윤종용 Method for enhancing soft/softer handoff using direct connection between BTSs in a CDMA system
US7151761B1 (en) 1999-03-19 2006-12-19 Telefonaktiebolaget L M Ericsson (Publ) Code reservation for interference measurement in a CDMA radiocommunication system
US6483820B1 (en) 1999-03-22 2002-11-19 Ericsson Inc. System and method for dynamic radio resource allocation for non-transparent high-speed circuit-switched data services
US6430401B1 (en) 1999-03-29 2002-08-06 Lucent Technologies Inc. Technique for effectively communicating multiple digital representations of a signal
GB2348776B (en) 1999-04-06 2003-07-09 Motorola Ltd A communications network and method of allocating resource thefor
US6249683B1 (en) 1999-04-08 2001-06-19 Qualcomm Incorporated Forward link power control of multiple data streams transmitted to a mobile station using a common power control channel
US6937665B1 (en) 1999-04-19 2005-08-30 Interuniversitaire Micron Elektronica Centrum Method and apparatus for multi-user transmission
EP1047209A1 (en) 1999-04-19 2000-10-25 Interuniversitair Micro-Elektronica Centrum Vzw A method and apparatus for multiuser transmission
US6614857B1 (en) 1999-04-23 2003-09-02 Lucent Technologies Inc. Iterative channel estimation and compensation based thereon
JP4224168B2 (en) 1999-04-23 2009-02-12 パナソニック株式会社 The base station apparatus and peak power suppressing method
EP1088408B1 (en) 1999-05-12 2008-07-16 Samsung Electronics Co., Ltd. Method for supporting a discontinuous transmission mode in a base station in a mobile communication system
JP3236273B2 (en) 1999-05-17 2001-12-10 三菱電機株式会社 Multicarrier transmission system and the multicarrier modulation scheme
US6445917B1 (en) 1999-05-19 2002-09-03 Telefonaktiebolaget Lm Ericsson (Publ) Mobile station measurements with event-based reporting
US6674810B1 (en) 1999-05-27 2004-01-06 3Com Corporation Method and apparatus for reducing peak-to-average power ratio in a discrete multi-tone signal
EP1063780A3 (en) 1999-06-02 2003-11-26 Texas Instruments Incorporated Spread spectrum channel estimation sequences
US6631126B1 (en) 1999-06-11 2003-10-07 Lucent Technologies Inc. Wireless communications using circuit-oriented and packet-oriented frame selection/distribution functions
FR2794915A1 (en) 1999-06-14 2000-12-15 Canon Kk Method and emitting device, METHOD and reception device, and systems implementing them
US7095708B1 (en) 1999-06-23 2006-08-22 Cingular Wireless Ii, Llc Methods and apparatus for use in communicating voice and high speed data in a wireless communication system
JP3518426B2 (en) 1999-06-30 2004-04-12 Kddi株式会社 Code allocation method in Cdma mobile communication system
US6657949B1 (en) 1999-07-06 2003-12-02 Cisco Technology, Inc. Efficient request access for OFDM systems
WO2001009276A1 (en) 1999-07-28 2001-02-08 Ciba Specialty Chemicals Holding Inc. Water-soluble granules of salen-type manganese complexes
US6831943B1 (en) 1999-08-13 2004-12-14 Texas Instruments Incorporated Code division multiple access wireless system with closed loop mode using ninety degree phase rotation and beamformer verification
KR100361223B1 (en) 1999-08-14 2002-11-23 주식회사 모리아테크놀로지 System providing paging indicators on the pilot channels in a wireless telecommunication
JP2001069046A (en) 1999-08-30 2001-03-16 Fujitsu Ltd Transmission reception system and receiver
US6542743B1 (en) 1999-08-31 2003-04-01 Qualcomm, Incorporated Method and apparatus for reducing pilot search times utilizing mobile station location information
US6765969B1 (en) 1999-09-01 2004-07-20 Motorola, Inc. Method and device for multi-user channel estimation
US6928047B1 (en) 1999-09-11 2005-08-09 The University Of Delaware Precoded OFDM systems robust to spectral null channels and vector OFDM systems with reduced cyclic prefix length
US6633614B1 (en) 1999-09-15 2003-10-14 Telcordia Technologies, Inc. Multicarrier personal access communication system
RU2242091C2 (en) 1999-10-02 2004-12-10 Самсунг Электроникс Ко., Лтд. Device and method for gating data transferred over control channel in cdma communication system
US7006482B1 (en) 1999-10-02 2006-02-28 Samsung Electronics Co., Ltd. Apparatus and method for gating data on a control channel in a CDMA communication system
CN100442393C (en) 1999-10-21 2008-12-10 松下电器产业株式会社 A semiconductor memory card access apparatus, a computer-readable recording medium, an initialization method, and a semiconductor memory card
US6337659B1 (en) 1999-10-25 2002-01-08 Gamma Nu, Inc. Phased array base station antenna system having distributed low power amplifiers
US6721568B1 (en) 1999-11-10 2004-04-13 Telefonaktiebolaget Lm Ericsson (Publ) Admission control in a mobile radio communications system
US6466800B1 (en) 1999-11-19 2002-10-15 Siemens Information And Communication Mobile, Llc Method and system for a wireless communication system incorporating channel selection algorithm for 2.4 GHz direct sequence spread spectrum cordless telephone system
JP3289718B2 (en) 1999-11-24 2002-06-10 日本電気株式会社 Time division multiple access method and the reference station apparatus, mobile station apparatus
DE19957288C1 (en) 1999-11-29 2001-05-10 Siemens Ag Channel structure signalling in radio communications system
EP1232575B1 (en) 1999-11-29 2009-06-03 Samsung Electronics Co., Ltd. method for assigning a common packet channel in a cdma communication system
US6763009B1 (en) 1999-12-03 2004-07-13 Lucent Technologies Inc. Down-link transmission scheduling in CDMA data networks
KR100602022B1 (en) 1999-12-15 2006-07-20 유티스타콤코리아 유한회사 Method for transmitting parameter use handoff to synchronous cell site from asynchronous cell site in a mobile communication system
US6351499B1 (en) 1999-12-15 2002-02-26 Iospan Wireless, Inc. Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter
US6628673B1 (en) 1999-12-29 2003-09-30 Atheros Communications, Inc. Scalable communication system using overlaid signals and multi-carrier frequency communication
US6678318B1 (en) 2000-01-11 2004-01-13 Agere Systems Inc. Method and apparatus for time-domain equalization in discrete multitone transceivers
US6888809B1 (en) 2000-01-13 2005-05-03 Lucent Technologies Inc. Space-time processing for multiple-input, multiple-output, wireless systems
US6907020B2 (en) 2000-01-20 2005-06-14 Nortel Networks Limited Frame structures supporting voice or streaming communications with high speed data communications in wireless access networks
US7463600B2 (en) 2000-01-20 2008-12-09 Nortel Networks Limited Frame structure for variable rate wireless channels transmitting high speed data
US6804307B1 (en) 2000-01-27 2004-10-12 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for efficient transmit diversity using complex space-time block codes
FI117465B (en) 2000-02-03 2006-10-31 Danisco Sweeteners Oy The method of chewable cores kovapinnoittamiseksi
US6754511B1 (en) 2000-02-04 2004-06-22 Harris Corporation Linear signal separation using polarization diversity
US6546248B1 (en) 2000-02-10 2003-04-08 Qualcomm, Incorporated Method and apparatus for generating pilot strength measurement messages
CN1107358C (en) 2000-02-24 2003-04-30 信息产业部电信科学技术研究院 Distributed intellignet antenna system
JP3826653B2 (en) 2000-02-25 2006-09-27 Kddi株式会社 Subcarrier allocation method of a wireless communication system
EP1260035A2 (en) * 2000-02-29 2002-11-27 HRL Laboratories, LLC Cooperative mobile antenna system
JP2001245355A (en) 2000-03-01 2001-09-07 Mitsubishi Electric Corp Packet transmission system in mobile communications
JP2001249802A (en) 2000-03-07 2001-09-14 Sony Corp Transmitting method, transmission system, transmission controller and input device
EP1266463B1 (en) 2000-03-15 2006-06-21 Nokia Corporation Transmit diversity method and system
US6473467B1 (en) 2000-03-22 2002-10-29 Qualcomm Incorporated Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system
US6940845B2 (en) 2000-03-23 2005-09-06 At & T, Corp. Asymmetric measurement-based dynamic packet assignment system and method for wireless data services
JP2001285927A (en) 2000-03-29 2001-10-12 Matsushita Electric Ind Co Ltd Communication terminal and wireless communication method
US6493331B1 (en) 2000-03-30 2002-12-10 Qualcomm Incorporated Method and apparatus for controlling transmissions of a communications systems
DE60021772T2 (en) 2000-04-07 2006-04-20 Nokia Corp. Method and apparatus for transmitting a plurality of antennas
US7289570B2 (en) 2000-04-10 2007-10-30 Texas Instruments Incorporated Wireless communications
US6934275B1 (en) 2000-04-17 2005-08-23 Motorola, Inc. Apparatus and method for providing separate forward dedicated and shared control channels in a communications system
US6961364B1 (en) 2000-04-18 2005-11-01 Flarion Technologies, Inc. Base station identification in orthogonal frequency division multiplexing based spread spectrum multiple access systems
US6954481B1 (en) 2000-04-18 2005-10-11 Flarion Technologies, Inc. Pilot use in orthogonal frequency division multiplexing based spread spectrum multiple access systems
US6807146B1 (en) 2000-04-21 2004-10-19 Atheros Communications, Inc. Protocols for scalable communication system using overland signals and multi-carrier frequency communication
US7397859B2 (en) 2000-04-22 2008-07-08 Atheros Communications, Inc. Multi-carrier communication systems employing variable symbol rates and number of carriers
US6748220B1 (en) 2000-05-05 2004-06-08 Nortel Networks Limited Resource allocation in wireless networks
US6519462B1 (en) 2000-05-11 2003-02-11 Lucent Technologies Inc. Method and apparatus for multi-user resource management in wireless communication systems
FI20001133A (en) 2000-05-12 2001-11-13 Nokia Corp A method of arranging data transmission between the terminal and the access point in a communication system
FI20001160A (en) 2000-05-15 2001-11-16 Nokia Networks Oy The way to implement a pilot signal
DE60038198T2 (en) 2000-05-17 2009-03-26 Matsushita Electric Industrial Co., Ltd., Kadoma-shi Hybrid ARQ system with data and control channel for data packet transfer
KR100370746B1 (en) 2000-05-30 2003-02-05 한국전자통신연구원 Multi-Dimensional Orthogonal Resource Hopping Multiplexing Communications Method and Apparatus thereof
CA2310188A1 (en) 2000-05-30 2001-11-30 Mark J. Frazer Communication structure with channels configured responsive to reception quality
GB2363256B (en) 2000-06-07 2004-05-12 Motorola Inc Adaptive antenna array and method of controlling operation thereof
US8223867B2 (en) 2000-06-09 2012-07-17 Texas Instruments Incorporated Wireless communications with efficient channel coding
US7248841B2 (en) 2000-06-13 2007-07-24 Agee Brian G Method and apparatus for optimization of wireless multipoint electromagnetic communication networks
US6337983B1 (en) 2000-06-21 2002-01-08 Motorola, Inc. Method for autonomous handoff in a wireless communication system
JP2002016531A (en) 2000-06-27 2002-01-18 Nec Corp Cdma communication system and its method
JP2002026790A (en) 2000-07-03 2002-01-25 Matsushita Electric Ind Co Ltd Wireless communication unit and wireless communication method
DE10032426B4 (en) 2000-07-04 2006-01-12 Siemens Ag Beamforming method
JP4212353B2 (en) 2000-07-11 2009-01-21 財団法人神奈川科学技術アカデミー Mass spectrometry probe liquid sample
EP1172983A3 (en) 2000-07-14 2005-06-29 Alcatel Carrier recovery in multicarrier systems
FR2814301B1 (en) 2000-07-17 2004-11-12 Telediffusion De France Tdf Synchronizing an FDMA signal
KR100493152B1 (en) * 2000-07-21 2005-06-02 삼성전자주식회사 Transmission antenna diversity method, base station apparatus and mobile station apparatus therefor in mobile communication system
GB2366938B (en) 2000-08-03 2004-09-01 Orange Personal Comm Serv Ltd Authentication in a mobile communications network
DE10039429A1 (en) 2000-08-11 2002-03-07 Siemens Ag A method of signal transmission in a radio communication system
GB0020088D0 (en) 2000-08-15 2000-10-04 Fujitsu Ltd Adaptive beam forming
US6980540B1 (en) 2000-08-16 2005-12-27 Lucent Technologies Inc. Apparatus and method for acquiring an uplink traffic channel, in wireless communications systems
CN1126382C (en) * 2000-08-24 2003-10-29 深圳市中兴通讯股份有限公司 Channel interleaving method in digital communication system
US6487184B1 (en) 2000-08-25 2002-11-26 Motorola, Inc. Method and apparatus for supporting radio acknowledgement information for a uni-directional user data channel
US6937592B1 (en) 2000-09-01 2005-08-30 Intel Corporation Wireless communications system that supports multiple modes of operation
US6898441B1 (en) 2000-09-12 2005-05-24 Lucent Technologies Inc. Communication system having a flexible transmit configuration
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US6694147B1 (en) 2000-09-15 2004-02-17 Flarion Technologies, Inc. Methods and apparatus for transmitting information between a basestation and multiple mobile stations
US6760882B1 (en) 2000-09-19 2004-07-06 Intel Corporation Mode selection for data transmission in wireless communication channels based on statistical parameters
US6802035B2 (en) 2000-09-19 2004-10-05 Intel Corporation System and method of dynamically optimizing a transmission mode of wirelessly transmitted information
CN1126307C (en) * 2000-09-22 2003-10-29 信息产业部电信传输研究所 Multiphase orthogonal spectrum spreading code design and its spread eliminating method
US6496790B1 (en) 2000-09-29 2002-12-17 Intel Corporation Management of sensors in computer systems
US6658258B1 (en) 2000-09-29 2003-12-02 Lucent Technologies Inc. Method and apparatus for estimating the location of a mobile terminal
US7349371B2 (en) 2000-09-29 2008-03-25 Arraycomm, Llc Selecting random access channels
US6778513B2 (en) 2000-09-29 2004-08-17 Arraycomm, Inc. Method and apparatus for separting multiple users in a shared-channel communication system
KR100452536B1 (en) 2000-10-02 2004-10-12 가부시키가이샤 엔.티.티.도코모 Mobile communication base station equipment
JP2002111556A (en) 2000-10-02 2002-04-12 Ntt Docomo Inc Base station device
US7072315B1 (en) 2000-10-10 2006-07-04 Adaptix, Inc. Medium access control for orthogonal frequency-division multiple-access (OFDMA) cellular networks
FR2815507B1 (en) 2000-10-16 2003-01-31 Cit Alcatel Radio Resource Management Method in an interactive telecommunication network
US6870808B1 (en) 2000-10-18 2005-03-22 Adaptix, Inc. Channel allocation in broadband orthogonal frequency-division multiple-access/space-division multiple-access networks
WO2002033856A1 (en) 2000-10-20 2002-04-25 Samsung Electronics Co., Ltd Apparatus and method for determining a data rate of packet data in a mobile communication system
US6907270B1 (en) 2000-10-23 2005-06-14 Qualcomm Inc. Method and apparatus for reduced rank channel estimation in a communications system
US6788959B2 (en) 2000-10-30 2004-09-07 Nokia Corporation Method and apparatus for transmitting and receiving dynamic configuration parameters in a third generation cellular telephone network
DE60044436D1 (en) 2000-11-03 2010-07-01 Sony Deutschland Gmbh Transmission power control for OFDM communications links
US6567387B1 (en) 2000-11-07 2003-05-20 Intel Corporation System and method for data transmission from multiple wireless base transceiver stations to a subscriber unit
EP1332640B1 (en) 2000-11-07 2007-02-21 Nokia Corporation Method and system for uplink scheduling of packet data traffic in wireless system
US20020090024A1 (en) 2000-11-15 2002-07-11 Tan Keng Tiong Method and apparatus for non-linear code-division multiple access technology
US7447270B1 (en) 2000-11-17 2008-11-04 Nokia Corporation Method for controlling the data signal weighting in multi-element transceivers and corresponding devices and telecommunications network
WO2002045456A1 (en) 2000-11-28 2002-06-06 Telefonaktiebolaget Lm Ericsson (Publ) Release of user equipment using a page procedure in a cellular communication system
GB0029424D0 (en) * 2000-12-02 2001-01-17 Koninkl Philips Electronics Nv Radio communication system
US6947748B2 (en) 2000-12-15 2005-09-20 Adaptix, Inc. OFDMA with adaptive subcarrier-cluster configuration and selective loading
CA2431502C (en) 2000-12-15 2012-07-17 Broadstrom Telecommunications, Inc. Multi-carrier communications with adaptive cluster configuration and switching
US20020077152A1 (en) 2000-12-15 2002-06-20 Johnson Thomas J. Wireless communication methods and systems using multiple overlapping sectored cells
CN100456758C (en) 2000-12-15 2009-01-28 昂达博思公司 Multi-carrier communications with group-based subcarrier allocation
US6862268B2 (en) 2000-12-29 2005-03-01 Nortel Networks, Ltd Method and apparatus for managing a CDMA supplemental channel
US6920119B2 (en) 2001-01-09 2005-07-19 Motorola, Inc. Method for scheduling and allocating data transmissions in a broad-band communications system
US6829293B2 (en) 2001-01-16 2004-12-07 Mindspeed Technologies, Inc. Method and apparatus for line probe signal processing
US6813284B2 (en) 2001-01-17 2004-11-02 Qualcomm Incorporated Method and apparatus for allocating data streams given transmission time interval (TTI) constraints
US6801790B2 (en) 2001-01-17 2004-10-05 Lucent Technologies Inc. Structure for multiple antenna configurations
EP1227601A1 (en) 2001-01-25 2002-07-31 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Downlink scheduling using parallel code trees
US6954448B2 (en) 2001-02-01 2005-10-11 Ipr Licensing, Inc. Alternate channel for carrying selected message types
RU2192094C1 (en) 2001-02-05 2002-10-27 Гармонов Александр Васильевич Method for coherent staggered signal transmission
FR2820574B1 (en) 2001-02-08 2005-08-05 Wavecom Sa A method of extracting a pattern of reference symbols used to estimate the transfer function of a transmission channel signal, corresponding device and processes
US7120134B2 (en) 2001-02-15 2006-10-10 Qualcomm, Incorporated Reverse link channel architecture for a wireless communication system
US6975868B2 (en) 2001-02-21 2005-12-13 Qualcomm Incorporated Method and apparatus for IS-95B reverse link supplemental code channel frame validation and fundamental code channel rate decision improvement
US20020160781A1 (en) 2001-02-23 2002-10-31 Gunnar Bark System, method and apparatus for facilitating resource allocation in a communication system
US6937641B2 (en) 2001-02-28 2005-08-30 Golden Bridge Technology, Inc. Power-controlled random access
US6930470B2 (en) 2001-03-01 2005-08-16 Nortel Networks Limited System and method for code division multiple access communication in a wireless communication environment
US6940827B2 (en) 2001-03-09 2005-09-06 Adaptix, Inc. Communication system using OFDM for one direction and DSSS for another direction
US6934340B1 (en) 2001-03-19 2005-08-23 Cisco Technology, Inc. Adaptive control system for interference rejections in a wireless communications system
US6478422B1 (en) 2001-03-19 2002-11-12 Richard A. Hansen Single bifocal custom shooters glasses
US6748024B2 (en) 2001-03-28 2004-06-08 Nokia Corporation Non-zero complex weighted space-time code for multiple antenna transmission
US7042897B1 (en) 2001-04-05 2006-05-09 Arcwave, Inc Medium access control layer protocol in a distributed environment
US6859503B2 (en) 2001-04-07 2005-02-22 Motorola, Inc. Method and system in a transceiver for controlling a multiple-input, multiple-output communications channel
US7145959B2 (en) 2001-04-25 2006-12-05 Magnolia Broadband Inc. Smart antenna based spectrum multiplexing using existing pilot signals for orthogonal frequency division multiplexing (OFDM) modulations
US7230941B2 (en) 2001-04-26 2007-06-12 Qualcomm Incorporated Preamble channel decoding
US6625172B2 (en) 2001-04-26 2003-09-23 Joseph P. Odenwalder Rescheduling scheduled transmissions
US7188300B2 (en) 2001-05-01 2007-03-06 Telefonaktiebolaget Lm Ericsson (Publ) Flexible layer one for radio interface to PLMN
US7106319B2 (en) 2001-09-14 2006-09-12 Seiko Epson Corporation Power supply circuit, voltage conversion circuit, semiconductor device, display device, display panel, and electronic equipment
US7042856B2 (en) 2001-05-03 2006-05-09 Qualcomm, Incorporation Method and apparatus for controlling uplink transmissions of a wireless communication system
EP1255369A1 (en) 2001-05-04 2002-11-06 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Link adaptation for wireless MIMO transmission schemes
RU2208911C2 (en) 2001-05-14 2003-07-20 Гармонов Александр Васильевич Method of diversified signal transmission and device for its realization
US7047016B2 (en) 2001-05-16 2006-05-16 Qualcomm, Incorporated Method and apparatus for allocating uplink resources in a multiple-input multiple-output (MIMO) communication system
US6662024B2 (en) 2001-05-16 2003-12-09 Qualcomm Incorporated Method and apparatus for allocating downlink resources in a multiple-input multiple-output (MIMO) communication system
DE60215073D1 (en) 2001-05-17 2006-11-16 Samsung Electronics Co Ltd A mobile communications device with array antenna and mobile communication method for
FR2825208B1 (en) 2001-05-22 2004-07-09 Cit Alcatel Method for communication resource allocation in a telecommunication system of the kind mf-tdma
US6904097B2 (en) 2001-06-01 2005-06-07 Motorola, Inc. Method and apparatus for adaptive signaling in a QAM communication system
US20020193146A1 (en) 2001-06-06 2002-12-19 Mark Wallace Method and apparatus for antenna diversity in a wireless communication system
US7206350B2 (en) 2001-06-11 2007-04-17 Unique Broadband Systems, Inc. OFDM multiple sub-channel communication system
WO2003001696A3 (en) 2001-06-21 2007-11-29 Flarion Technologies Inc Method of tone allocation for tone hopping sequences
US7027523B2 (en) 2001-06-22 2006-04-11 Qualcomm Incorporated Method and apparatus for transmitting data in a time division duplexed (TDD) communication system
GB0116015D0 (en) 2001-06-29 2001-08-22 Simoco Digital Systems Ltd Communications systems
US6963543B2 (en) 2001-06-29 2005-11-08 Qualcomm Incorporated Method and system for group call service
US6751444B1 (en) 2001-07-02 2004-06-15 Broadstorm Telecommunications, Inc. Method and apparatus for adaptive carrier allocation and power control in multi-carrier communication systems
JP2003018054A (en) 2001-07-02 2003-01-17 Ntt Docomo Inc Radio communication method and system, and communication device
DE10132492A1 (en) 2001-07-03 2003-01-23 Hertz Inst Heinrich Adaptive signal processing method for bidirectional wireless transmission in a MIMO channel and MIMO system for implementation of the method
JP3607643B2 (en) 2001-07-13 2005-01-05 松下電器産業株式会社 Multicarrier transmission apparatus, multicarrier receiving apparatus, and a multicarrier radio communication method
US7236536B2 (en) 2001-07-26 2007-06-26 Lucent Technologies Inc. Method and apparatus for detection and decoding of signals received from a linear propagation channel
US20030027579A1 (en) 2001-08-03 2003-02-06 Uwe Sydon System for and method of providing an air interface with variable data rate by switching the bit time
JP4318412B2 (en) 2001-08-08 2009-08-26 富士通株式会社 Transceiver and transmission and reception method in a communication system
KR100703295B1 (en) 2001-08-18 2007-04-03 삼성전자주식회사 Method and apparatus for transporting and receiving data using antenna array in mobile system
US6776765B2 (en) 2001-08-21 2004-08-17 Synovis Life Technologies, Inc. Steerable stylet
JP2003069472A (en) 2001-08-24 2003-03-07 Matsushita Electric Ind Co Ltd Reception terminal device and communication system
KR100474689B1 (en) 2001-08-30 2005-03-08 삼성전자주식회사 Method for power control during soft handoff in mobile communication system
FR2829642B1 (en) 2001-09-12 2004-01-16 Eads Defence & Security Ntwk Multicarrier signal, method of tracking a transmission channel from such a signal and device for its implementation
WO2003028302A3 (en) 2001-09-24 2003-09-04 Atheros Comm Inc Method and system for variable rate acknowledgement for wireless communication protocols
JP2003101515A (en) 2001-09-25 2003-04-04 Sony Corp Radio communication system, base station, mobile station, transmission control method and program storage medium
KR100440182B1 (en) 2001-09-29 2004-07-14 삼성전자주식회사 Quick paging method in shadowing area
RU2207723C1 (en) 2001-10-01 2003-06-27 Военный университет связи Method of distribution of resources in electric communication system with multiple access
US7218906B2 (en) 2001-10-04 2007-05-15 Wisconsin Alumni Research Foundation Layered space time processing in a multiple antenna system
US7548506B2 (en) 2001-10-17 2009-06-16 Nortel Networks Limited System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design
US7248559B2 (en) 2001-10-17 2007-07-24 Nortel Networks Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
CA2408423C (en) 2001-10-17 2013-12-24 Nec Corporation Mobile communication system, communication control method, base station and mobile station to be used in the same
US7773699B2 (en) 2001-10-17 2010-08-10 Nortel Networks Limited Method and apparatus for channel quality measurements
JP3675433B2 (en) 2001-10-17 2005-07-27 日本電気株式会社 Mobile communication system and a communication control method and a base station used for the same, the mobile station
US7116652B2 (en) 2001-10-18 2006-10-03 Lucent Technologies Inc. Rate control technique for layered architectures with multiple transmit and receive antennas
US7349667B2 (en) 2001-10-19 2008-03-25 Texas Instruments Incorporated Simplified noise estimation and/or beamforming for wireless communications
KR100452639B1 (en) 2001-10-20 2004-10-14 한국전자통신연구원 Common Packet Channel Access Method for Mobile Satellite Communication System
KR100547847B1 (en) 2001-10-26 2006-01-31 삼성전자주식회사 Control apparatus and method for a reverse link in a mobile communication system.
US20030086393A1 (en) 2001-11-02 2003-05-08 Subramanian Vasudevan Method for allocating wireless communication resources
US20030125040A1 (en) 2001-11-06 2003-07-03 Walton Jay R. Multiple-access multiple-input multiple-output (MIMO) communication system
US6909707B2 (en) 2001-11-06 2005-06-21 Motorola, Inc. Method and apparatus for pseudo-random noise offset reuse in a multi-sector CDMA system
KR20040058268A (en) 2001-11-07 2004-07-03 코닌클리케 필립스 일렉트로닉스 엔.브이. Method of selecting a subset of antennas among a plurality of antennas in a diversity system
EP1444804B1 (en) 2001-11-13 2013-02-27 Telcordia Technologies, Inc. Method and system for spectrally compatible remote terminal adsl deployment
GB2382265B (en) 2001-11-14 2004-06-09 Toshiba Res Europ Ltd Emergency rescue aid
JP3637965B2 (en) 2001-11-22 2005-04-13 日本電気株式会社 Wireless communication system
KR20050095657A (en) 2001-11-29 2005-09-29 인터디지탈 테크날러지 코포레이션 System and method utilizing dynamic beam forming for wireless communication signals
JP3756110B2 (en) 2001-11-29 2006-03-15 シャープ株式会社 Wireless communication device
DE60233255D1 (en) 2001-12-03 2009-09-17 Nokia Corp routers access to guidelines based mechanisms for the selection of and mobile context
US7154936B2 (en) 2001-12-03 2006-12-26 Qualcomm, Incorporated Iterative detection and decoding for a MIMO-OFDM system
JP3895165B2 (en) 2001-12-03 2007-03-22 株式会社エヌ・ティ・ティ・ドコモ A communication control system, communication control method, communication base station and the mobile terminal
US6799043B2 (en) 2001-12-04 2004-09-28 Qualcomm, Incorporated Method and apparatus for a reverse link supplemental channel scheduling
JP3955463B2 (en) 2001-12-05 2007-08-08 ソフトバンクテレコム株式会社 Orthogonal frequency division multiplexing communication system
US20030112745A1 (en) 2001-12-17 2003-06-19 Xiangyang Zhuang Method and system of operating a coded OFDM communication system
US7054301B1 (en) 2001-12-31 2006-05-30 Arraycomm, Llc. Coordinated hopping in wireless networks using adaptive antenna arrays
US7020110B2 (en) 2002-01-08 2006-03-28 Qualcomm Incorporated Resource allocation for MIMO-OFDM communication systems
JP3914203B2 (en) 2002-01-10 2007-05-16 富士通株式会社 Pilot multiplexing method and ofdm receiving method in Ofdm system
KR100547848B1 (en) 2002-01-16 2006-02-01 삼성전자주식회사 Method and apparatus for transmitting and receiving status information of forward channel in multiple carrier mobile telecommunication system
DE10240138A1 (en) 2002-01-18 2003-08-14 Siemens Ag Dynamic resource allocation in radio communications system, exchanges resources and makes changes to unoccupied sub-bands, selecting allocation of highest radio capacity
US6954622B2 (en) 2002-01-29 2005-10-11 L-3 Communications Corporation Cooperative transmission power control method and system for CDMA communication systems
US20030142648A1 (en) 2002-01-31 2003-07-31 Samsung Electronics Co., Ltd. System and method for providing a continuous high speed packet data handoff
US7006557B2 (en) 2002-01-31 2006-02-28 Qualcomm Incorporated Time tracking loop for diversity pilots
JP2003235072A (en) 2002-02-06 2003-08-22 Ntt Docomo Inc Wireless resource assignment method, wireless resource assignment apparatus, and mobile communication system
GB2386513B (en) 2002-02-07 2004-08-25 Samsung Electronics Co Ltd Apparatus and method for transmitting/receiving serving hs-scch set information in an hsdpa communication system
US7031742B2 (en) 2002-02-07 2006-04-18 Qualcomm Incorporation Forward and reverse link power control of serving and non-serving base stations in a wireless communication system
RU2237379C2 (en) 2002-02-08 2004-09-27 Самсунг Электроникс Method and device for shaping directivity pattern of base-station adaptive antenna array
EP1483856A2 (en) 2002-02-13 2004-12-08 Witcom ltd. Near-field spatial multiplexing
US7009500B2 (en) 2002-02-13 2006-03-07 Ford Global Technologies, Llc Method for operating a pre-crash sensing system in a vehicle having a countermeasure system using stereo cameras
WO2003069832A1 (en) 2002-02-13 2003-08-21 Siemens Aktiengesellschaft Method for beamforming a multi-use receiver with channel estimation
US7050759B2 (en) 2002-02-19 2006-05-23 Qualcomm Incorporated Channel quality feedback mechanism and method
JP2003249907A (en) 2002-02-22 2003-09-05 Hitachi Kokusai Electric Inc Transmitting device of ofdm system
US6862271B2 (en) 2002-02-26 2005-03-01 Qualcomm Incorporated Multiple-input, multiple-output (MIMO) systems with multiple transmission modes
US7099299B2 (en) 2002-03-04 2006-08-29 Agency For Science, Technology And Research CDMA system with frequency domain equalization
US7039356B2 (en) * 2002-03-12 2006-05-02 Blue7 Communications Selecting a set of antennas for use in a wireless communication system
KR100464014B1 (en) 2002-03-21 2004-12-30 엘지전자 주식회사 Closed -Loop Signal Processing Method of Multi Input, Multi Output Mobile Communication System
US7197084B2 (en) 2002-03-27 2007-03-27 Qualcomm Incorporated Precoding for a multipath channel in a MIMO system
JP2003292667A (en) 2002-03-29 2003-10-15 Jsr Corp Thermoplastic elastomer composition for crosslinking foaming, method for manufacturing molded article, and molded article
US6741587B2 (en) 2002-04-02 2004-05-25 Nokia Corporation Inter-frequency measurements with MIMO terminals
US6850741B2 (en) 2002-04-04 2005-02-01 Agency For Science, Technology And Research Method for selecting switched orthogonal beams for downlink diversity transmission
US7508804B2 (en) 2002-04-05 2009-03-24 Alcatel-Lucent Usa Inc. Shared signaling for multiple user equipment
KR100896682B1 (en) 2002-04-09 2009-05-14 삼성전자주식회사 Mobile communication apparatus and method having transmitting/receiving multiantenna
JP2003348598A (en) * 2002-04-12 2003-12-05 Seiko Epson Corp Method and apparatus for memory efficient compressed domain video processing and for fast inverse motion compensation using factorization and integer approximation
JP4299148B2 (en) 2002-04-15 2009-07-22 パナソニック株式会社 Receiving apparatus and a receiving method
US7522673B2 (en) 2002-04-22 2009-04-21 Regents Of The University Of Minnesota Space-time coding using estimated channel information
JP2003318857A (en) 2002-04-25 2003-11-07 Mitsubishi Electric Corp Digital broadcast receiver
US6839336B2 (en) 2002-04-29 2005-01-04 Qualcomm, Incorporated Acknowledging broadcast transmissions
US7161971B2 (en) 2002-04-29 2007-01-09 Qualcomm, Incorporated Sending transmission format information on dedicated channels
US7170876B2 (en) 2002-04-30 2007-01-30 Qualcomm, Inc. Outer-loop scheduling design for communication systems with channel quality feedback mechanisms
US20030212616A1 (en) 2002-05-09 2003-11-13 Casabyte, Inc. Method, apparatus and article to remotely associate wireless communications devices with subscriber identities and/or proxy wireless communications devices
JP4334274B2 (en) 2002-05-16 2009-09-30 株式会社エヌ・ティ・ティ・ドコモ Multi-carrier transmission for transmitter and multicarrier transmission method
KR100689399B1 (en) 2002-05-17 2007-03-08 삼성전자주식회사 Apparatus and method for control of forward-link beamforming in mobile communication system
JP2003347985A (en) 2002-05-22 2003-12-05 Fujitsu Ltd Radio base station apparatus and power saving method thereof
JP4067873B2 (en) 2002-05-24 2008-03-26 三菱電機株式会社 Wireless transmission device
US6917602B2 (en) 2002-05-29 2005-07-12 Nokia Corporation System and method for random access channel capture with automatic retransmission request
US8699505B2 (en) 2002-05-31 2014-04-15 Qualcomm Incorporated Dynamic channelization code allocation
US7899067B2 (en) 2002-05-31 2011-03-01 Cisco Technology, Inc. Method and apparatus for generating and using enhanced tree bitmap data structures in determining a longest prefix match
US7366223B1 (en) 2002-06-06 2008-04-29 Arraycomm, Llc Modifying hopping sequences in wireless networks
WO2003105370A8 (en) 2002-06-07 2004-05-13 R Thomas Derryberry Apparatus and an associated method, by which to facilitate scheduling of data communications ina radio communications system
KR100548311B1 (en) 2002-06-07 2006-02-02 엘지전자 주식회사 Transmission diversity apparatus and method for mobile communication system
JP3751265B2 (en) 2002-06-20 2006-03-01 松下電器産業株式会社 Wireless communication system and scheduling method
US7095709B2 (en) 2002-06-24 2006-08-22 Qualcomm, Incorporated Diversity transmission modes for MIMO OFDM communication systems
US7613248B2 (en) 2002-06-24 2009-11-03 Qualcomm Incorporated Signal processing with channel eigenmode decomposition and channel inversion for MIMO systems
DE60311464T2 (en) 2002-06-27 2007-08-30 Koninklijke Philips Electronics N.V. Measurement of channel properties in a communication system
US20040077379A1 (en) 2002-06-27 2004-04-22 Martin Smith Wireless transmitter, transceiver and method
DE50204684D1 (en) * 2002-06-27 2005-12-01 Siemens Ag Arrangement and method for transmitting data in a multi-input multi-output radio communication system
US7372911B1 (en) 2002-06-28 2008-05-13 Arraycomm, Llc Beam forming and transmit diversity in a multiple array radio communications system
US7043274B2 (en) 2002-06-28 2006-05-09 Interdigital Technology Corporation System for efficiently providing coverage of a sectorized cell for common and dedicated channels utilizing beam forming and sweeping
KR100640470B1 (en) 2002-06-29 2006-10-30 삼성전자주식회사 Apparatus for transferring data using transmit antenna diversity scheme in packet service communication system and method thereof
CN1219372C (en) 2002-07-08 2005-09-14 华为技术有限公司 Transmission method for implementing multimedia broadcast and multicast service
KR100630112B1 (en) 2002-07-09 2006-09-27 삼성전자주식회사 Apparatus and method for adaptive channel estimation in a mobile communication system
US7243150B2 (en) 2002-07-10 2007-07-10 Radwin Ltd. Reducing the access delay for transmitting processed data over transmission data
US20040017785A1 (en) 2002-07-16 2004-01-29 Zelst Allert Van System for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to/from a central processing base station
WO2004008671A1 (en) 2002-07-16 2004-01-22 Matsushita Electric Industrial Co., Ltd. Communicating method, transmitting device using the same, and receiving device using the same
EP1563656A1 (en) 2002-07-17 2005-08-17 Soma Networks, Inc. Frequency domain equalization in communications systems with scrambling
WO2004008681A1 (en) 2002-07-17 2004-01-22 Koninklijke Philips Electronics N.V. Time-frequency interleaved mc-cdma for quasi-synchronous systems
JP4310272B2 (en) 2002-07-18 2009-08-05 インターデイジタル テクノロジー コーポレーション Ovsf code assignment
US7020446B2 (en) 2002-07-31 2006-03-28 Mitsubishi Electric Research Laboratories, Inc. Multiple antennas at transmitters and receivers to achieving higher diversity and data rates in MIMO systems
JP4022744B2 (en) 2002-08-01 2007-12-19 日本電気株式会社 Mobile communication system and the best cell change method and the base station controller for use therein
EP1525690B1 (en) 2002-08-02 2012-07-18 NMS Communications Methods and apparatus for network signal aggregation and bandwidth reduction
JP4047655B2 (en) 2002-08-07 2008-02-13 京セラ株式会社 Wireless communication system
EP1597883B1 (en) 2003-02-19 2012-11-21 QUALCOMM Incorporated Controlled superposition coding in multi-user communication systems
US6788963B2 (en) 2002-08-08 2004-09-07 Flarion Technologies, Inc. Methods and apparatus for operating mobile nodes in multiple a states
US7418241B2 (en) 2002-08-09 2008-08-26 Qualcomm Incorporated System and techniques for enhancing the reliability of feedback in a wireless communications system
US7558193B2 (en) 2002-08-12 2009-07-07 Starent Networks Corporation Redundancy in voice and data communications systems
US7180627B2 (en) 2002-08-16 2007-02-20 Paxar Corporation Hand-held portable printer with RFID read/write capability
US7280622B2 (en) 2002-08-21 2007-10-09 Texas Instruments Incorporated Low-complexity hierarchical decoding for communications systems using multidimensional QAM signaling
DE60313336T2 (en) 2002-08-21 2008-04-10 Zyray Wireless, Inc., San Diego Antenna array with virtual antenna elements and associated method
JP3999605B2 (en) 2002-08-23 2007-10-31 株式会社エヌ・ティ・ティ・ドコモ Base station, the mobile communication system and communication method
US8179833B2 (en) 2002-12-06 2012-05-15 Qualcomm Incorporated Hybrid TDM/OFDM/CDM reverse link transmission
DE10238796B4 (en) 2002-08-23 2006-09-14 Siemens Ag A method for determining the direction of the position of a mobile station relative to a base station, mobile radio system and means for determining the direction
US7050405B2 (en) 2002-08-23 2006-05-23 Qualcomm Incorporated Method and system for a data transmission in a communication system
US6940917B2 (en) * 2002-08-27 2005-09-06 Qualcomm, Incorporated Beam-steering and beam-forming for wideband MIMO/MISO systems
JP2004096142A (en) 2002-08-29 2004-03-25 Hitachi Kokusai Electric Inc Area polling system
KR100831987B1 (en) 2002-08-30 2008-05-23 삼성전자주식회사 Transmitter and receiver using multiple antenna system for multiuser
US7167916B2 (en) 2002-08-30 2007-01-23 Unisys Corporation Computer OS dispatcher operation with virtual switching queue and IP queues
US7519032B2 (en) 2002-09-04 2009-04-14 Koninklijke Philips Electronics N.V. Apparatus and method for providing QoS service schedule and bandwidth allocation to a wireless station
US7313407B2 (en) 2002-09-05 2007-12-25 Aharon Shapira Allocation of radio resources in a CDMA2000 cellular system
US7260153B2 (en) 2002-09-09 2007-08-21 Mimopro Ltd. Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels
US6776165B2 (en) 2002-09-12 2004-08-17 The Regents Of The University Of California Magnetic navigation system for diagnosis, biopsy and drug delivery vehicles
WO2004028037A1 (en) * 2002-09-20 2004-04-01 Mitsubishi Denki Kabushiki Kaisha Radio communication system
US7209712B2 (en) 2002-09-23 2007-04-24 Qualcomm, Incorporated Mean square estimation of channel quality measure
GB0222555D0 (en) * 2002-09-28 2002-11-06 Koninkl Philips Electronics Nv Packet data transmission system
KR100933155B1 (en) 2002-09-30 2009-12-21 삼성전자주식회사 Resource allocation apparatus and method of the virtual cell in a frequency division multiple access mobile communication system,
US7317680B2 (en) 2002-10-01 2008-01-08 Nortel Networks Limited Channel mapping for OFDM
US7412212B2 (en) 2002-10-07 2008-08-12 Nokia Corporation Communication system
JP4602641B2 (en) 2002-10-18 2010-12-22 株式会社エヌ・ティ・ティ・ドコモ Signal transmission system, the signal transmission method and a transmitter
KR100461547B1 (en) 2002-10-22 2004-12-16 한국전자통신연구원 Transceiver for ds/cdma mimo antenna systems utilizing full receiver diversity
US7477618B2 (en) 2002-10-25 2009-01-13 Qualcomm Incorporated Method and apparatus for stealing power or code for data channel operations
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
US8169944B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US8208364B2 (en) 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8218609B2 (en) 2002-10-25 2012-07-10 Qualcomm Incorporated Closed-loop rate control for a multi-channel communication system
WO2004038972A1 (en) 2002-10-26 2004-05-06 Electronics And Telecommunications Research Institute Frequency hopping ofdma method using symbols of comb pattern
US7023880B2 (en) 2002-10-28 2006-04-04 Qualcomm Incorporated Re-formatting variable-rate vocoder frames for inter-system transmissions
US7330701B2 (en) 2002-10-29 2008-02-12 Nokia Corporation Low complexity beamformers for multiple transmit and receive antennas
US7042857B2 (en) 2002-10-29 2006-05-09 Qualcom, Incorporated Uplink pilot and signaling transmission in wireless communication systems
US6928062B2 (en) 2002-10-29 2005-08-09 Qualcomm, Incorporated Uplink pilot and signaling transmission in wireless communication systems
EP2169834A3 (en) 2002-10-30 2010-10-20 Nxp B.V. Trellis-based receiver
US6963959B2 (en) 2002-10-31 2005-11-08 International Business Machines Corporation Storage system and method for reorganizing data to improve prefetch effectiveness and reduce seek distance
JP2004153676A (en) 2002-10-31 2004-05-27 Mitsubishi Electric Corp Communication equipment, transmitter, and receiver
JP2004158901A (en) 2002-11-01 2004-06-03 Kddi Corp Transmission apparatus, system, and method using ofdm and mc-cdma
US7680507B2 (en) 2002-11-04 2010-03-16 Alcatel-Lucent Usa Inc. Shared control and signaling channel for users subscribing to data services in a communication system
JP4095881B2 (en) 2002-11-13 2008-06-04 佐藤 ▼壽▲芳 Evaluation method of road surface plan
DE10254384B4 (en) 2002-11-17 2005-11-17 Siemens Ag Bidirectional signal processing method for a MIMO system with a rank-adaptive adjustment of the data transfer rate
JP4084639B2 (en) 2002-11-19 2008-04-30 株式会社エヌ・ティ・ティ・ドコモ Admission control method in a mobile communication, a mobile communication system, mobile station, admission controller and admission control program
US20040098505A1 (en) 2002-11-20 2004-05-20 Clemmensen Daniel G. Forwarding system with multiple logical sub-system functionality
JP3796212B2 (en) 2002-11-20 2006-07-12 松下電器産業株式会社 The base station apparatus and the transmission allocation control method
KR100479864B1 (en) 2002-11-26 2005-03-31 학교법인 중앙대학교 Method and apparatus embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same
DK1568185T3 (en) 2002-12-04 2011-07-11 Interdigital Tech Corp Pålidelighedsdetektering of channel quality indicator (CQI) and the use of power control in the outer loop
JP4350491B2 (en) 2002-12-05 2009-10-21 パナソニック株式会社 Wireless communication system, wireless communication method, and wireless communication device
US7164732B2 (en) 2002-12-09 2007-01-16 Broadcom Corporation Edge incremental redundancy support in a cellular wireless terminal
CN1266846C (en) * 2002-12-11 2006-07-26 华为技术有限公司 Space-time emitting diversity method
KR100507519B1 (en) 2002-12-13 2005-08-17 한국전자통신연구원 Method and Apparatus for Signal Constitution for Downlink of OFDMA Based Cellular Systems
US7508798B2 (en) 2002-12-16 2009-03-24 Nortel Networks Limited Virtual mimo communication system
KR100552669B1 (en) 2002-12-26 2006-02-20 한국전자통신연구원 Adaptive Modulation Method for MIMO System using Layered Time-Space detector
US6904550B2 (en) 2002-12-30 2005-06-07 Motorola, Inc. Velocity enhancement for OFDM systems
JP4098096B2 (en) 2003-01-06 2008-06-11 三菱電機株式会社 Spread spectrum receiver apparatus
US7280467B2 (en) 2003-01-07 2007-10-09 Qualcomm Incorporated Pilot transmission schemes for wireless multi-carrier communication systems
US8400979B2 (en) 2003-01-07 2013-03-19 Qualcomm Incorporated Forward link handoff for wireless communication systems with OFDM forward link and CDMA reverse link
CN1302671C (en) 2003-01-07 2007-02-28 华为技术有限公司 Payment method for receiving multimedia short message by utilizing third side as receiving side
KR100950652B1 (en) 2003-01-08 2010-04-01 삼성전자주식회사 Method for estimating forward link channel condition in orthogonal frequency division multiplexing access
JP4139230B2 (en) 2003-01-15 2008-08-27 松下電器産業株式会社 Transmission apparatus and transmission method
US7346018B2 (en) 2003-01-16 2008-03-18 Qualcomm, Incorporated Margin control in a data communication system
CN100417269C (en) 2003-01-20 2008-09-03 中兴通讯股份有限公司 Method for switching wave packet of intelligent antenna
KR100580244B1 (en) 2003-01-23 2006-05-16 삼성전자주식회사 A handoff method in wirelessLAN
WO2004068721A3 (en) 2003-01-28 2005-12-08 Celletra Ltd System and method for load distribution between base station sectors
JP4276009B2 (en) 2003-02-06 2009-06-10 株式会社エヌ・ティ・ティ・ドコモ Mobile station, a base station, a wireless transmission program, and a radio transmission method
JP4514463B2 (en) 2003-02-12 2010-07-28 パナソニック株式会社 Transmitting apparatus and radio communication method
JP3740471B2 (en) 2003-02-13 2006-02-01 株式会社東芝 Ofdm receiving apparatus, a semiconductor integrated circuit and ofdm receiving method
EP1593246A1 (en) 2003-02-14 2005-11-09 DoCoMo Communications Laboratories Europe GmbH Two-dimensional channel estimation for multicarrier multiple input multiple outpout communication systems
US8391249B2 (en) 2003-02-18 2013-03-05 Qualcomm Incorporated Code division multiplexing commands on a code division multiplexed channel
RU2368106C2 (en) 2003-02-18 2009-09-20 Квэлкомм Инкорпорейтед Planned and autonomous transmission and receipt confirmation
US7155236B2 (en) 2003-02-18 2006-12-26 Qualcomm Incorporated Scheduled and autonomous transmission and acknowledgement
US7660282B2 (en) 2003-02-18 2010-02-09 Qualcomm Incorporated Congestion control in a wireless data network
US7813322B2 (en) 2003-02-19 2010-10-12 Qualcomm Incorporated Efficient automatic repeat request methods and apparatus
US9544860B2 (en) 2003-02-24 2017-01-10 Qualcomm Incorporated Pilot signals for use in multi-sector cells
WO2004077724A3 (en) 2003-02-24 2005-09-22 Autocell Lab Inc System and method for channel selection in a wireless network
KR100539230B1 (en) 2003-02-26 2005-12-27 삼성전자주식회사 Physical layer unit providing for transmitting and receiving signals of several protocols, wireless Local Area Network system by the unit and wireless Local Area Network method
KR20050110716A (en) 2003-02-27 2005-11-23 인터디지탈 테크날러지 코포레이션 Method for implementing fast-dynamic channel allocation radio resource management procedures
JP2004260658A (en) 2003-02-27 2004-09-16 Matsushita Electric Ind Co Ltd Wireless lan device
KR100547758B1 (en) 2003-02-28 2006-01-31 삼성전자주식회사 Preamble transmission and reception apparatus and method for a UWB communication system
US7486735B2 (en) 2003-02-28 2009-02-03 Nortel Networks Limited Sub-carrier allocation for OFDM
US7746816B2 (en) 2003-03-13 2010-06-29 Qualcomm Incorporated Method and system for a power control in a communication system
US20040181569A1 (en) 2003-03-13 2004-09-16 Attar Rashid Ahmed Method and system for a data transmission in a communication system
US20040179480A1 (en) 2003-03-13 2004-09-16 Attar Rashid Ahmed Method and system for estimating parameters of a link for data transmission in a communication system
US6927728B2 (en) 2003-03-13 2005-08-09 Motorola, Inc. Method and apparatus for multi-antenna transmission
US7885228B2 (en) 2003-03-20 2011-02-08 Qualcomm Incorporated Transmission mode selection for data transmission in a multi-channel communication system
US7130580B2 (en) 2003-03-20 2006-10-31 Lucent Technologies Inc. Method of compensating for correlation between multiple antennas
US7016319B2 (en) 2003-03-24 2006-03-21 Motorola, Inc. Method and apparatus for reducing co-channel interference in a communication system
EP1611723B1 (en) 2003-03-25 2016-05-18 Tamiras Per Pte. Ltd., LLC Position adjusted guard time interval for ofdm-communications system
JP4181906B2 (en) 2003-03-26 2008-11-19 富士通株式会社 The transmitter and receiver
JP4162522B2 (en) 2003-03-26 2008-10-08 三洋電機株式会社 The radio base apparatus, transmission directivity control method, and a transmission directivity control program
US20040192386A1 (en) 2003-03-26 2004-09-30 Naveen Aerrabotu Method and apparatus for multiple subscriber identities in a mobile communication device
JP4218387B2 (en) 2003-03-26 2009-02-04 日本電気株式会社 Wireless communication system, a base station and radio link quality information correction method and a program for use therewith
DE60301270T2 (en) 2003-03-27 2006-07-20 Nnt Docomo, Inc. Apparatus and method for estimating a plurality of channels
US7233634B1 (en) 2003-03-27 2007-06-19 Nortel Networks Limited Maximum likelihood decoding
GB2400271B (en) 2003-04-02 2005-03-02 Matsushita Electric Ind Co Ltd Dynamic resource allocation in packet data transfer
US7085574B2 (en) 2003-04-15 2006-08-01 Qualcomm, Incorporated Grant channel assignment
JP4077355B2 (en) 2003-04-16 2008-04-16 三菱電機株式会社 Communication apparatus and communication method
US7406055B2 (en) 2003-04-21 2008-07-29 Mitsubishi Denki Kabushiki Kaisha Radio communication apparatus, transmitter apparatus, receiver apparatus and radio communication system
CN101771445B (en) 2003-04-23 2013-05-01 高通股份有限公司 Methods and apparatus of enhancing performance in wireless communication systems
US7640373B2 (en) 2003-04-25 2009-12-29 Motorola, Inc. Method and apparatus for channel quality feedback within a communication system
KR100942645B1 (en) 2003-04-29 2010-02-17 엘지전자 주식회사 Method for transmitting signal in mobile communication system
US6824416B2 (en) 2003-04-30 2004-11-30 Agilent Technologies, Inc. Mounting arrangement for plug-in modules
US20040219919A1 (en) 2003-04-30 2004-11-04 Nicholas Whinnett Management of uplink scheduling modes in a wireless communication system
US7013143B2 (en) 2003-04-30 2006-03-14 Motorola, Inc. HARQ ACK/NAK coding for a communication device during soft handoff
US6993342B2 (en) 2003-05-07 2006-01-31 Motorola, Inc. Buffer occupancy used in uplink scheduling for a communication device
US6882855B2 (en) 2003-05-09 2005-04-19 Motorola, Inc. Method and apparatus for CDMA soft handoff for dispatch group members
US7254158B2 (en) 2003-05-12 2007-08-07 Qualcomm Incorporated Soft handoff with interference cancellation in a wireless frequency hopping communication system
US6950319B2 (en) 2003-05-13 2005-09-27 Delta Electronics, Inc. AC/DC flyback converter
US7545867B1 (en) 2003-05-14 2009-06-09 Marvell International, Ltd. Adaptive channel bandwidth selection for MIMO wireless systems
KR100526542B1 (en) 2003-05-15 2005-11-08 삼성전자주식회사 Apparatus for transmitting/receiving data using transmit diversity scheme with multiple antenna in mobile communication system and method thereof
US7181196B2 (en) 2003-05-15 2007-02-20 Lucent Technologies Inc. Performing authentication in a communications system
EP1623512A1 (en) 2003-05-15 2006-02-08 Lg Electronics Inc. Method and apparatus for allocating channelization codes for wireless communications
US20040228313A1 (en) 2003-05-16 2004-11-18 Fang-Chen Cheng Method of mapping data for uplink transmission in communication systems
JP4235181B2 (en) 2003-05-20 2009-03-11 富士通株式会社 Mobile management node and a mobile node used in the application data transfer method and the mobile communication system in a mobile communication system
WO2004107693A1 (en) 2003-05-28 2004-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for wireless communication networks using relaying
US7454510B2 (en) 2003-05-29 2008-11-18 Microsoft Corporation Controlled relay of media streams across network perimeters
US7366137B2 (en) 2003-05-31 2008-04-29 Qualcomm Incorporated Signal-to-noise estimation in wireless communication devices with receive diversity
US7079870B2 (en) 2003-06-09 2006-07-18 Ipr Licensing, Inc. Compensation techniques for group delay effects in transmit beamforming radio communication
KR100547734B1 (en) 2003-06-13 2006-01-31 삼성전자주식회사 An orthogonal frequency division medium access control layer in a mobile communication system using a multi-way operating state controlling method
WO2004114549A1 (en) 2003-06-13 2004-12-29 Nokia Corporation Enhanced data only code division multiple access (cdma) system
KR100539947B1 (en) 2003-06-18 2005-12-28 삼성전자주식회사 Apparatus and method for transmitting/receiving pilot pattern for distinguish base station in communication using orthogonal frequency division multiplexing scheme
US7236747B1 (en) 2003-06-18 2007-06-26 Samsung Electronics Co., Ltd. (SAIT) Increasing OFDM transmit power via reduction in pilot tone
WO2004114615A1 (en) 2003-06-22 2004-12-29 Ntt Docomo, Inc. Apparatus and method for estimating a channel in a multiple input transmission system
KR20050000709A (en) 2003-06-24 2005-01-06 삼성전자주식회사 Apparatus and method for transmitting/receiving data according to channel states in communication systems using multiple access scheme
US7433661B2 (en) 2003-06-25 2008-10-07 Lucent Technologies Inc. Method for improved performance and reduced bandwidth channel state information feedback in communication systems
US7856063B2 (en) 2003-06-25 2010-12-21 Industrial Research Limited Narrowband interference suppression for OFDM systems
US7394865B2 (en) 2003-06-25 2008-07-01 Nokia Corporation Signal constellations for multi-carrier systems
US20040267778A1 (en) 2003-06-27 2004-12-30 Microsoft Corporation Media foundation topology application programming interface
JP3746280B2 (en) 2003-06-27 2006-02-15 株式会社東芝 COMMUNICATION METHOD, COMMUNICATION SYSTEM AND COMMUNICATION device
JPWO2005002253A1 (en) 2003-06-30 2006-08-10 日本電気株式会社 Wireless communication system and transmission mode selection method
US20050009476A1 (en) 2003-07-07 2005-01-13 Shiquan Wu Virtual MIMO transmitters, receivers, systems and methods
US7522919B2 (en) 2003-07-14 2009-04-21 Telefonaktiebolaget Lm Ericsson (Publ) Enhancements to periodic silences in wireless communication systems
US7313126B2 (en) 2003-07-31 2007-12-25 Samsung Electronics Co., Ltd. Control system and multiple access method in wireless communication system
EP1652325B1 (en) 2003-08-05 2010-05-05 Telecom Italia S.p.A. Method for providing extra-traffic paths with connection protection in a communication network, related network and computer program product therefor
US7126928B2 (en) 2003-08-05 2006-10-24 Qualcomm Incorporated Grant, acknowledgement, and rate control active sets
KR20050015731A (en) 2003-08-07 2005-02-21 삼성전자주식회사 Method and apparatus for deciding shuffling pattern in double space-time transmit diversity system using minimum signal to noise ratio
US7460494B2 (en) 2003-08-08 2008-12-02 Intel Corporation Adaptive signaling in multiple antenna systems
KR101160135B1 (en) 2003-08-12 2012-06-26 파나소닉 주식회사 Radio communication apparatus and pilot symbol transmission method
EP1654820A4 (en) 2003-08-13 2011-01-19 Qualcomm Inc Methods and apparatus of power control in wireless communication systems
DE60306519T2 (en) 2003-08-14 2006-11-09 Matsushita Electric Industrial Co., Ltd., Kadoma Synchronization of base stations during soft handover
RU2235429C1 (en) 2003-08-15 2004-08-27 Федеральное государственное унитарное предприятие "Воронежский научно-исследовательский институт связи" Method and device for time-and-frequency synchronization of communication system
US7257167B2 (en) 2003-08-19 2007-08-14 The University Of Hong Kong System and method for multi-access MIMO channels with feedback capacity constraint
KR101109936B1 (en) 2003-08-20 2012-02-27 파나소닉 주식회사 Radio communication apparatus and subcarrier assignment method
US20050063298A1 (en) 2003-09-02 2005-03-24 Qualcomm Incorporated Synchronization in a broadcast OFDM system using time division multiplexed pilots
JP4194091B2 (en) 2003-09-02 2008-12-10 ソニー・エリクソン・モバイルコミュニケーションズ株式会社 Radio communication system and a wireless communication device
US7221680B2 (en) 2003-09-02 2007-05-22 Qualcomm Incorporated Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
US7400856B2 (en) 2003-09-03 2008-07-15 Motorola, Inc. Method and apparatus for relay facilitated communications
US7356073B2 (en) 2003-09-10 2008-04-08 Nokia Corporation Method and apparatus providing an advanced MIMO receiver that includes a signal-plus-residual-interference (SPRI) detector
US6917821B2 (en) 2003-09-23 2005-07-12 Qualcomm, Incorporated Successive interference cancellation receiver processing with selection diversity
US20050068921A1 (en) 2003-09-29 2005-03-31 Jung-Tao Liu Multiplexing of physical channels on the uplink
KR100950668B1 (en) 2003-09-30 2010-04-02 삼성전자주식회사 Apparatus and method for transmitting/receiving uplink pilot signal in a communication system using an orthogonal frequency division multiple access scheme
EP1573936B1 (en) 2003-09-30 2006-07-26 NTT DoCoMo, Inc. Apparatus and method for cyclic delay diversity
KR20060097720A (en) 2003-09-30 2006-09-14 텔레폰악티에볼라겟엘엠에릭슨(펍) Method and apparatus for congestion control in high speed wireless packet data networks
JP2005110130A (en) 2003-10-01 2005-04-21 Samsung Electronics Co Ltd Common channel transmission system, common channel transmission method and communication program
EP1521414B1 (en) 2003-10-03 2008-10-29 Kabushiki Kaisha Toshiba Method and apparatus for sphere decoding
US7230942B2 (en) 2003-10-03 2007-06-12 Qualcomm, Incorporated Method of downlink resource allocation in a sectorized environment
US7039370B2 (en) 2003-10-16 2006-05-02 Flarion Technologies, Inc. Methods and apparatus of providing transmit and/or receive diversity with multiple antennas in wireless communication systems
US7242722B2 (en) 2003-10-17 2007-07-10 Motorola, Inc. Method and apparatus for transmission and reception within an OFDM communication system
US7120395B2 (en) 2003-10-20 2006-10-10 Nortel Networks Limited MIMO communications
DE60315301T2 (en) 2003-10-21 2009-04-09 Alcatel Lucent A method for allocation of subcarriers and selecting the modulation scheme in a wireless multi-carrier transmission system
US7508748B2 (en) 2003-10-24 2009-03-24 Qualcomm Incorporated Rate selection for a multi-carrier MIMO system
KR20050040988A (en) 2003-10-29 2005-05-04 삼성전자주식회사 Communication method for frequency hopping ofdm based cellular system
KR100957415B1 (en) 2003-10-31 2010-05-11 삼성전자주식회사 Apparatus for transmitting/receiving a pilot signal for distinguish a base station in a communication using orthogonal frequency division multiplexing scheme and method thereof
KR101023330B1 (en) 2003-11-05 2011-03-18 삼성전자주식회사 Hybrid automatic repeat request method for supporting quality of service in wireless communication systems
US7664533B2 (en) 2003-11-10 2010-02-16 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for a multi-beam antenna system
EP1533950A1 (en) 2003-11-21 2005-05-25 Sony International (Europe) GmbH Method for connecting a mobile terminal to a wireless communication system, wireless communication system and mobile terminal for a wireless communication system
US7298805B2 (en) 2003-11-21 2007-11-20 Qualcomm Incorporated Multi-antenna transmission for spatial division multiple access
US7356000B2 (en) 2003-11-21 2008-04-08 Motorola, Inc. Method and apparatus for reducing call setup delay
JP2005167502A (en) 2003-12-01 2005-06-23 Ntt Docomo Inc Wireless communication system, control apparatus for transmission wireless station, control apparatus for reception wireless station, and subcarrier selecting method
US9473269B2 (en) 2003-12-01 2016-10-18 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
KR20050053907A (en) 2003-12-03 2005-06-10 삼성전자주식회사 Method for assigning sub-carrier in a mobile communication system using orthogonal frequency division multiple access scheme
US7145940B2 (en) 2003-12-05 2006-12-05 Qualcomm Incorporated Pilot transmission schemes for a multi-antenna system
RU2321949C1 (en) 2003-12-05 2008-04-10 Самсунг Электроникс Ко., Лтд. Device and method for transmitting data using selected own vector in mimo-system of closed contour mobile communications
JP4188372B2 (en) 2003-12-05 2008-11-26 日本電信電話株式会社 Radio communication device, radio communication method and a radio communication system,
EP1542488A1 (en) 2003-12-12 2005-06-15 Telefonaktiebolaget LM Ericsson (publ) Method and apparatus for allocating a pilot signal adapted to the channel characteristics
KR100856227B1 (en) 2003-12-15 2008-09-03 삼성전자주식회사 Apparatus and method for transmitting/receiving in a mobile communication system
US8204149B2 (en) 2003-12-17 2012-06-19 Qualcomm Incorporated Spatial spreading in a multi-antenna communication system
EP1545082A3 (en) 2003-12-17 2005-08-03 Kabushiki Kaisha Toshiba Signal decoding methods and apparatus
US7302009B2 (en) 2003-12-17 2007-11-27 Qualcomm Incorporated Broadcast transmission with spatial spreading in a multi-antenna communication system
KR100560386B1 (en) 2003-12-17 2006-03-13 한국전자통신연구원 An apparatus for OFDMA transmission and reception for the coherent detection in the uplink, and a method thereof
KR20050063826A (en) 2003-12-19 2005-06-28 엘지전자 주식회사 Method for allocating radio resource in radio communication system
KR100507541B1 (en) 2003-12-19 2005-08-09 삼성전자주식회사 Data and pilot carrier allocation method and receiving method, receiving apparatus and, sending method, sending apparatus in ofdm system
WO2005062496A1 (en) 2003-12-22 2005-07-07 Telefonaktiebolaget Lm Ericsson (Publ) A method for determining transmit weights
JP4301931B2 (en) 2003-12-22 2009-07-22 株式会社三共 Game machine
KR100943572B1 (en) 2003-12-23 2010-02-24 삼성전자주식회사 Apparatus for allocating subchannel adaptively considering frequency reuse in orthogonal frequency division multiple access system and method thereof
KR100981580B1 (en) 2003-12-23 2010-09-10 삼성전자주식회사 Differential Space-Time Block Codes Transceiver Apparatus For Up To 8 Transmit Antennas
US7352819B2 (en) 2003-12-24 2008-04-01 Intel Corporation Multiantenna communications apparatus, methods, and system
JP2005197772A (en) 2003-12-26 2005-07-21 Toshiba Corp Adaptive array antenna device
US7872963B2 (en) 2003-12-27 2011-01-18 Electronics And Telecommunications Research Institute MIMO-OFDM system using eigenbeamforming method
US7489621B2 (en) 2003-12-30 2009-02-10 Alexander A Maltsev Adaptive puncturing technique for multicarrier systems
WO2005069538A1 (en) 2004-01-07 2005-07-28 Deltel, Inc./Pbnext Method and apparatus for telecommunication system
CN1642051A (en) 2004-01-08 2005-07-20 电子科技大学 Method for obtaining optimum guide symbolic power
WO2005065062A3 (en) 2004-01-09 2005-10-20 Joon Kui Ahn Packet transmission method
US7289585B2 (en) 2004-01-12 2007-10-30 Intel Corporation Multicarrier receivers and methods for separating transmitted signals in a multiple antenna system
JP4167183B2 (en) 2004-01-14 2008-10-15 株式会社国際電気通信基礎技術研究所 The control device of the array antenna
CA2525239C (en) 2004-01-20 2013-01-08 Qualcomm Incorporated Synchronized broadcast/multicast communication
US20050159162A1 (en) 2004-01-20 2005-07-21 Samsung Electronics Co., Ltd. Method for transmitting data in mobile communication network
JP2007518346A (en) 2004-01-20 2007-07-05 エルジー エレクトロニクス インコーポレイティド Signal transmission and reception method in a Mimo system
US8611283B2 (en) 2004-01-28 2013-12-17 Qualcomm Incorporated Method and apparatus of using a single channel to provide acknowledgement and assignment messages
JP4230933B2 (en) 2004-02-03 2009-02-25 株式会社エヌ・ティ・ティ・ドコモ Receivers, transmitters and radio communication system and power allocation method
US8144735B2 (en) 2004-02-10 2012-03-27 Qualcomm Incorporated Transmission of signaling information for broadcast and multicast services
GB2412541B (en) 2004-02-11 2006-08-16 Samsung Electronics Co Ltd Method of operating TDD/virtual FDD hierarchical cellular telecommunication system
KR100827105B1 (en) 2004-02-13 2008-05-02 삼성전자주식회사 Method and apparatus for ranging to support fast handover in broadband wireless communication system
CN1943152B (en) 2004-02-13 2011-07-27 桥扬科技有限公司 Methods and apparatus for multi-carrier communication systems with adaptive transmission and feedback
EP1763932A4 (en) 2004-02-17 2010-01-06 Huawei Tech Co Ltd Multiplexing scheme in a communication system
US7564906B2 (en) 2004-02-17 2009-07-21 Nokia Siemens Networks Oy OFDM transceiver structure with time-domain scrambling
JP2005236678A (en) 2004-02-19 2005-09-02 Toyota Motor Corp Receiver for mobile object
WO2005086500A1 (en) 2004-02-27 2005-09-15 Nokia Corporation Constrained optimization based mimo lmmse-sic receiver for cdma downlink
US7421041B2 (en) 2004-03-01 2008-09-02 Qualcomm, Incorporated Iterative channel and interference estimation and decoding
US20050195886A1 (en) 2004-03-02 2005-09-08 Nokia Corporation CPICH processing for SINR estimation in W-CDMA system
KR101084113B1 (en) 2004-03-05 2011-11-17 엘지전자 주식회사 Method for Transmitting Service Information Applying to Handover in Mobile Broadband Wireless Access System
US7290195B2 (en) 2004-03-05 2007-10-30 Microsoft Corporation Adaptive acknowledgment delay
US20050201296A1 (en) 2004-03-15 2005-09-15 Telefonaktiebolaget Lm Ericsson (Pu Reduced channel quality feedback
EP1726111A4 (en) 2004-03-15 2012-07-04 Nortel Networks Ltd Pilot design for ofdm systems with four transmit antennas
US7706350B2 (en) 2004-03-19 2010-04-27 Qualcomm Incorporated Methods and apparatus for flexible spectrum allocation in communication systems
US20050207367A1 (en) 2004-03-22 2005-09-22 Onggosanusi Eko N Method for channel quality indicator computation and feedback in a multi-carrier communications system
US7907898B2 (en) 2004-03-26 2011-03-15 Qualcomm Incorporated Asynchronous inter-piconet routing
JP2005284751A (en) 2004-03-30 2005-10-13 Fujitsu Ltd Logic verification system, logic verification method, and logic verification program
US7848442B2 (en) 2004-04-02 2010-12-07 Lg Electronics Inc. Signal processing apparatus and method in multi-input/multi-output communications systems
JP4288368B2 (en) 2004-04-09 2009-07-01 Okiセミコンダクタ株式会社 Reception control method and wireless lan device
US7684507B2 (en) 2004-04-13 2010-03-23 Intel Corporation Method and apparatus to select coding mode
US7047006B2 (en) 2004-04-28 2006-05-16 Motorola, Inc. Method and apparatus for transmission and reception of narrowband signals within a wideband communication system
KR100594084B1 (en) 2004-04-30 2006-06-30 삼성전자주식회사 Channel estimation method and channel estimator in ofdm/ofdma receiver
GB0409704D0 (en) 2004-04-30 2004-06-02 Nokia Corp A method for verifying a first identity and a second identity of an entity
CN1691539A (en) 2004-04-30 2005-11-02 皇家飞利浦电子股份有限公司 Universal MIMO combined detecting method and apparatus for MIMO wireless communication system
CA2506267A1 (en) 2004-05-04 2005-11-04 Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Industry Through The Communications Research Centre Multi-subband frequency hopping communication system and method
US20050250544A1 (en) 2004-05-07 2005-11-10 Stephen Grant Base station, mobile terminal device and method for implementing a selective-per-antenna-rate-control (S-PARC) technique in a wireless communications network
US7411898B2 (en) 2004-05-10 2008-08-12 Infineon Technologies Ag Preamble generator for a multiband OFDM transceiver
JP4447372B2 (en) 2004-05-13 2010-04-07 株式会社エヌ・ティ・ティ・ドコモ Wireless communication system, wireless communication apparatus, wireless receiving apparatus, wireless communication method and a channel estimation method
KR20050109789A (en) 2004-05-17 2005-11-22 삼성전자주식회사 Beamforming method for sdm/mimo system
US20050259005A1 (en) 2004-05-20 2005-11-24 Interdigital Technology Corporation Beam forming matrix-fed circular array system
US8000377B2 (en) 2004-05-24 2011-08-16 General Dynamics C4 Systems, Inc. System and method for variable rate multiple access short message communications
JP4398791B2 (en) 2004-05-25 2010-01-13 株式会社エヌ・ティ・ティ・ドコモ Transmitter and transmission control method
US7551564B2 (en) 2004-05-28 2009-06-23 Intel Corporation Flow control method and apparatus for single packet arrival on a bidirectional ring interconnect
KR100754794B1 (en) 2004-05-29 2007-09-03 삼성전자주식회사 Apparatus and method for transmitting /receiving cell identification code in mobile communication system
US7437164B2 (en) 2004-06-08 2008-10-14 Qualcomm Incorporated Soft handoff for reverse link in a wireless communication system with frequency reuse
US8619907B2 (en) 2004-06-10 2013-12-31 Agere Systems, LLC Method and apparatus for preamble training in a multiple antenna communication system
US7769107B2 (en) 2004-06-10 2010-08-03 Intel Corporation Semi-blind analog beamforming for multiple-antenna systems
US7773950B2 (en) 2004-06-16 2010-08-10 Telefonaktiebolaget Lm Ericsson (Publ) Benign interference suppression for received signal quality estimation
US8027372B2 (en) 2004-06-18 2011-09-27 Qualcomm Incorporated Signal acquisition in a wireless communication system
US7724777B2 (en) 2004-06-18 2010-05-25 Qualcomm Incorporated Quasi-orthogonal multiplexing for a multi-carrier communication system
US7599327B2 (en) 2004-06-24 2009-10-06 Motorola, Inc. Method and apparatus for accessing a wireless communication system
US7299048B2 (en) 2004-06-25 2007-11-20 Samsung Electronics Co., Ltd. System and method for performing soft handover in broadband wireless access communication system
KR101053610B1 (en) 2004-06-25 2011-08-03 엘지전자 주식회사 Radio resource allocation method of Ofdm / ofdma system
US8031686B2 (en) 2004-06-30 2011-10-04 Neocific, Inc. Methods and apparatus for power control in multi-carrier wireless systems
US8000268B2 (en) 2004-06-30 2011-08-16 Motorola Mobility, Inc. Frequency-hopped IFDMA communication system
CN100526828C (en) 2004-07-02 2009-08-12 振动技术公司 System and method for simultaneously controlling spectrum and kurtosis of a random vibration
US8588326B2 (en) 2004-07-07 2013-11-19 Apple Inc. System and method for mapping symbols for MIMO transmission
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US7257406B2 (en) 2004-07-23 2007-08-14 Qualcomm, Incorporated Restrictive reuse set management
US7864659B2 (en) 2004-08-02 2011-01-04 Interdigital Technology Corporation Quality control scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems
CN101019340B (en) 2004-08-03 2010-10-27 新加坡科技研究局 Method for transmitting a digital data stream, transmitter, method for receiving a digital data stream and receiver
US7428426B2 (en) 2004-08-06 2008-09-23 Qualcomm, Inc. Method and apparatus for controlling transmit power in a wireless communications device
US7499393B2 (en) 2004-08-11 2009-03-03 Interdigital Technology Corporation Per stream rate control (PSRC) for improving system efficiency in OFDM-MIMO communication systems
US7535882B2 (en) 2004-08-12 2009-05-19 Lg Electronics, Inc. Reception in dedicated service of wireless communication system
US20060218459A1 (en) 2004-08-13 2006-09-28 David Hedberg Coding systems and methods
US7899497B2 (en) 2004-08-18 2011-03-01 Ruckus Wireless, Inc. System and method for transmission parameter control for an antenna apparatus with selectable elements
US7336727B2 (en) 2004-08-19 2008-02-26 Nokia Corporation Generalized m-rank beamformers for MIMO systems using successive quantization
US7852746B2 (en) 2004-08-25 2010-12-14 Qualcomm Incorporated Transmission of signaling in an OFDM-based system
US7894548B2 (en) 2004-09-03 2011-02-22 Qualcomm Incorporated Spatial spreading with space-time and space-frequency transmit diversity schemes for a wireless communication system
US7362822B2 (en) 2004-09-08 2008-04-22 Intel Corporation Recursive reduction of channel state feedback
US7613423B2 (en) 2004-09-10 2009-11-03 Samsung Electronics Co., Ltd. Method of creating active multipaths for mimo wireless systems
WO2006028204A1 (en) 2004-09-10 2006-03-16 Matsushita Electric Industrial Co., Ltd. Wireless communication apparatus and wireless communication method
GB0420164D0 (en) 2004-09-10 2004-10-13 Nokia Corp A scheduler
EP1786130A1 (en) 2004-09-17 2007-05-16 Matsushita Electric Industrial Co., Ltd. Transmission control frame generation device and transmission control device
KR100715910B1 (en) 2004-09-20 2007-05-08 삼성전자주식회사 Apparatus and method for cell search in mobile communication system using multiple access scheme
US7924935B2 (en) 2004-09-30 2011-04-12 Nortel Networks Limited Channel sounding in OFDMA system
US8325863B2 (en) 2004-10-12 2012-12-04 Qualcomm Incorporated Data detection and decoding with considerations for channel estimation errors due to guard subbands
US7969858B2 (en) 2004-10-14 2011-06-28 Qualcomm Incorporated Wireless terminal methods and apparatus for use in wireless communications systems supporting different size frequency bands
KR100648472B1 (en) 2004-10-19 2006-11-28 삼성전자주식회사 Apparatus and method of transmitting and receiving for optimizing of performance of amc in multi-input multi-output system
US7636328B2 (en) 2004-10-20 2009-12-22 Qualcomm Incorporated Efficient transmission of signaling using channel constraints
KR101023366B1 (en) 2004-10-27 2011-03-18 삼성전자주식회사 Method and apparatus for transmitting/receiving a signal in a multiple input multiple output wireless communication system using beam forming scheme
US20060089104A1 (en) 2004-10-27 2006-04-27 Nokia Corporation Method for improving an HS-DSCH transport format allocation
GB2419788B (en) * 2004-11-01 2007-10-31 Toshiba Res Europ Ltd Interleaver and de-interleaver systems
US20060093061A1 (en) 2004-11-04 2006-05-04 Samsung Electronics Co., Ltd. Apparatus and method for transmitting and receiving data using space-time block coding
US7139328B2 (en) 2004-11-04 2006-11-21 Motorola, Inc. Method and apparatus for closed loop data transmission
US7627051B2 (en) 2004-11-08 2009-12-01 Samsung Electronics Co., Ltd. Method of maximizing MIMO system performance by joint optimization of diversity and spatial multiplexing
US7616955B2 (en) 2004-11-12 2009-11-10 Broadcom Corporation Method and system for bits and coding assignment utilizing Eigen beamforming with fixed rates for closed loop WLAN
CA2588144C (en) 2004-11-16 2013-03-12 Qualcomm Incorporated Closed-loop rate control for a mimo communication system
US20060104333A1 (en) 2004-11-18 2006-05-18 Motorola, Inc. Acknowledgment for a time division channel
US20060111054A1 (en) 2004-11-22 2006-05-25 Interdigital Technology Corporation Method and system for selecting transmit antennas to reduce antenna correlation
US7512096B2 (en) 2004-11-24 2009-03-31 Alcatel-Lucent Usa Inc. Communicating data between an access point and multiple wireless devices over a link
WO2006059566A1 (en) 2004-11-30 2006-06-08 Matsushita Electric Industrial Co., Ltd. Transmission control frame generation device, transmission control frame processing device, transmission control frame generation method, and transmission control frame processing method
US7593473B2 (en) 2004-12-01 2009-09-22 Bae Systems Information And Electronic Systems Integration Inc. Tree structured multicarrier multiple access systems
US7822128B2 (en) 2004-12-03 2010-10-26 Intel Corporation Multiple antenna multicarrier transmitter and method for adaptive beamforming with transmit-power normalization
WO2006062356A1 (en) * 2004-12-08 2006-06-15 Electronics And Telecommunications Research Institute Transmitter, receiver and method for controlling multiple input multiple output system
US8238923B2 (en) 2004-12-22 2012-08-07 Qualcomm Incorporated Method of using shared resources in a communication system
RU2378771C2 (en) 2004-12-22 2010-01-10 Квэлкомм Инкорпорейтед Methods and devices for flexible channel switching in multiple access communication network
US7940710B2 (en) 2004-12-22 2011-05-10 Qualcomm Incorporated Methods and apparatus for efficient paging in a wireless communication system
US8179876B2 (en) 2004-12-22 2012-05-15 Qualcomm Incorporated Multiple modulation technique for use in a communication system
US7543197B2 (en) 2004-12-22 2009-06-02 Qualcomm Incorporated Pruned bit-reversal interleaver
US20060140289A1 (en) 2004-12-27 2006-06-29 Mandyam Giridhar D Method and apparatus for providing an efficient pilot scheme for channel estimation
CN1642335A (en) 2005-01-06 2005-07-20 东南大学 Mixed wireless resource management method for mobile communication system
US7778826B2 (en) 2005-01-13 2010-08-17 Intel Corporation Beamforming codebook generation system and associated methods
EP1843497A4 (en) 2005-01-18 2012-08-22 Sharp Kk Wireless communication apparatus, mobile terminal and wireless communication method
JP2006211537A (en) 2005-01-31 2006-08-10 Nec Commun Syst Ltd Code state change apparatus, code state change method, and code state change program
KR100966044B1 (en) 2005-02-24 2010-06-28 삼성전자주식회사 System and method for allocating frequency resource in a multicell communication system
KR20060096365A (en) 2005-03-04 2006-09-11 삼성전자주식회사 User scheduling method for multiuser mimo communication system
KR100950644B1 (en) 2005-03-04 2010-04-01 삼성전자주식회사 Feedback method for mimo communication system
US8135088B2 (en) 2005-03-07 2012-03-13 Q1UALCOMM Incorporated Pilot transmission and channel estimation for a communication system utilizing frequency division multiplexing
US20060203794A1 (en) 2005-03-10 2006-09-14 Qualcomm Incorporated Systems and methods for beamforming in multi-input multi-output communication systems
US7720162B2 (en) 2005-03-10 2010-05-18 Qualcomm Incorporated Partial FFT processing and demodulation for a system with multiple subcarriers
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US7512412B2 (en) 2005-03-15 2009-03-31 Qualcomm, Incorporated Power control and overlapping control for a quasi-orthogonal communication system
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US20090213950A1 (en) 2005-03-17 2009-08-27 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US8031583B2 (en) 2005-03-30 2011-10-04 Motorola Mobility, Inc. Method and apparatus for reducing round trip latency and overhead within a communication system
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US7797018B2 (en) 2005-04-01 2010-09-14 Interdigital Technology Corporation Method and apparatus for selecting a multi-band access point to associate with a multi-band mobile station
US7711033B2 (en) 2005-04-14 2010-05-04 Telefonaktiebolaget Lm Ericsson (Publ) SIR prediction method and apparatus
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US7768979B2 (en) 2005-05-18 2010-08-03 Qualcomm Incorporated Separating pilot signatures in a frequency hopping OFDM system by selecting pilot symbols at least hop away from an edge of a hop region
US8077692B2 (en) 2005-05-20 2011-12-13 Qualcomm Incorporated Enhanced frequency division multiple access for wireless communication
US7916681B2 (en) 2005-05-20 2011-03-29 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for communication channel error rate estimation
US20070183303A1 (en) 2005-05-26 2007-08-09 Zhouyue Pi Method and apparatus for specifying channel state information for multiple carriers
JP4599228B2 (en) 2005-05-30 2010-12-15 株式会社日立製作所 Wireless transceiver
US8842693B2 (en) 2005-05-31 2014-09-23 Qualcomm Incorporated Rank step-down for MIMO SCW design employing HARQ
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US8126066B2 (en) 2005-06-09 2012-02-28 Telefonaktiebolaget Lm Ericsson (Publ) Time and frequency channel estimation
US7403470B2 (en) 2005-06-13 2008-07-22 Qualcomm Incorporated Communications system, methods and apparatus
JP4869724B2 (en) 2005-06-14 2012-02-08 株式会社エヌ・ティ・ティ・ドコモ Transmitting device, transmitting method, receiving apparatus and receiving method
EP1734773A1 (en) 2005-06-14 2006-12-20 Alcatel A method for uplink interference coordination in single frequency networks, a base station a mobile terminal and a mobile network therefor
US8254924B2 (en) 2005-06-16 2012-08-28 Qualcomm Incorporated Method and apparatus for adaptive registration and paging area determination
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US8098667B2 (en) 2005-06-16 2012-01-17 Qualcomm Incorporated Methods and apparatus for efficient providing of scheduling information
US20070071147A1 (en) 2005-06-16 2007-03-29 Hemanth Sampath Pseudo eigen-beamforming with dynamic beam selection
US8750908B2 (en) 2005-06-16 2014-06-10 Qualcomm Incorporated Quick paging channel with reduced probability of missed page
DE102005028179A1 (en) 2005-06-17 2006-12-28 Siemens Ag A method for establishing a connection with mobile terminals in communications networks with variable bandwidths
WO2007002032A3 (en) 2005-06-20 2007-02-22 Texas Instruments Inc Slow uplink power control
KR100606099B1 (en) 2005-06-22 2006-07-20 삼성전자주식회사 Method and apparatus for configuration of ack/nack channel in a frequency division multiplexing system
US7403745B2 (en) 2005-08-02 2008-07-22 Lucent Technologies Inc. Channel quality predictor and method of estimating a channel condition in a wireless communications network
US20070183386A1 (en) 2005-08-03 2007-08-09 Texas Instruments Incorporated Reference Signal Sequences and Multi-User Reference Signal Sequence Allocation
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
JP2009505586A (en) * 2005-08-18 2009-02-05 ビシーム・コミュニケーションズ・インコーポレーテッド Antenna virtualization method in a communication system
JP2009505560A (en) * 2005-08-19 2009-02-05 ミツビシ・エレクトリック・リサーチ・ラボラトリーズ・インコーポレイテッド Optimal signaling and selection and validation for transmit antenna selection by feedback with error
US8073068B2 (en) 2005-08-22 2011-12-06 Qualcomm Incorporated Selective virtual antenna transmission
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
WO2007024913A1 (en) 2005-08-22 2007-03-01 Qualcomm Incorporated Method and apparatus for selection of virtual antennas
US8331463B2 (en) 2005-08-22 2012-12-11 Qualcomm Incorporated Channel estimation in communications
US20070041457A1 (en) 2005-08-22 2007-02-22 Tamer Kadous Method and apparatus for providing antenna diversity in a wireless communication system
EP1938493B1 (en) 2005-08-24 2014-10-08 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US8644292B2 (en) 2005-08-24 2014-02-04 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US20070047495A1 (en) 2005-08-29 2007-03-01 Qualcomm Incorporated Reverse link soft handoff in a wireless multiple-access communication system
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
DE102005041273B4 (en) 2005-08-31 2014-05-08 Intel Mobile Communications GmbH A method for computer-assisted forming system information medium access control protocol messages, medium access control unit and computer program element
WO2007035048A3 (en) 2005-09-21 2007-06-21 Seok Woo Lee A method of enabling a combined data rate control lock channel in a wireless communication system
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US8134977B2 (en) 2005-10-27 2012-03-13 Qualcomm Incorporated Tune-away protocols for wireless systems
US9210651B2 (en) 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US7835460B2 (en) 2005-10-27 2010-11-16 Qualcomm Incorporated Apparatus and methods for reducing channel estimation noise in a wireless transceiver
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US20070165738A1 (en) 2005-10-27 2007-07-19 Barriac Gwendolyn D Method and apparatus for pre-coding for a mimo system
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US8649362B2 (en) 2005-11-02 2014-02-11 Texas Instruments Incorporated Methods for determining the location of control channels in the uplink of communication systems
US8582548B2 (en) 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8891457B2 (en) 2005-12-08 2014-11-18 Apple Inc. Resource assignment systems and methods
US8437251B2 (en) 2005-12-22 2013-05-07 Qualcomm Incorporated Methods and apparatus for communicating transmission backlog information
US9148795B2 (en) 2005-12-22 2015-09-29 Qualcomm Incorporated Methods and apparatus for flexible reporting of control information
US9451491B2 (en) 2005-12-22 2016-09-20 Qualcomm Incorporated Methods and apparatus relating to generating and transmitting initial and additional control information report sets in a wireless system
KR100793315B1 (en) 2005-12-31 2008-01-11 포스데이타 주식회사 Method and apparatus for measuring carrier to interference and noise ratio using downlink preamble
US8831607B2 (en) 2006-01-05 2014-09-09 Qualcomm Incorporated Reverse link other sector communication
US20070242653A1 (en) 2006-04-13 2007-10-18 Futurewei Technologies, Inc. Method and apparatus for sharing radio resources in an ofdma-based communication system
EP1855424B1 (en) 2006-05-12 2013-07-10 Panasonic Corporation Reservation of radio resources for users in a mobile communications system
EP2547003B1 (en) 2006-09-06 2014-10-15 Qualcomm Incorporated Codeword permutation and reduced feedback for grouped antennas
KR20080036493A (en) 2006-10-23 2008-04-28 엘지전자 주식회사 Network access method in mobile communication system and terminal supporting the same
KR101106372B1 (en) 2006-11-06 2012-01-18 콸콤 인코포레이티드 Method and apparatus for a mimo transmission with layer permutation in a wireless communication system
US8259695B2 (en) 2007-04-30 2012-09-04 Alcatel Lucent Method and apparatus for packet wireless telecommunications
US20090180459A1 (en) 2008-01-16 2009-07-16 Orlik Philip V OFDMA Frame Structures for Uplinks in MIMO Networks
KR101563032B1 (en) 2008-08-12 2015-10-23 노오텔 네트웍스 리미티드 Enabling downlink transparent relay in a wireless communications network
US8228862B2 (en) 2008-12-03 2012-07-24 Samsung Electronics Co., Ltd. Method and system for reference signal pattern design
US8238483B2 (en) 2009-02-27 2012-08-07 Marvell World Trade Ltd. Signaling of dedicated reference signal (DRS) precoding granularity
US20100232384A1 (en) 2009-03-13 2010-09-16 Qualcomm Incorporated Channel estimation based upon user specific and common reference signals
KR200471652Y1 (en) 2013-08-07 2014-03-12 남경탁 Furniture having chair

Patent Citations (102)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5604744A (en) * 1992-10-05 1997-02-18 Telefonaktiebolaget Lm Ericsson Digital control channels having logical channels for multiple access radiocommunication
US5594738A (en) * 1993-10-18 1997-01-14 Motorola, Inc. Time slot allocation method
US6016123A (en) * 1994-02-16 2000-01-18 Northern Telecom Limited Base station antenna arrangement
US6169910B1 (en) * 1994-12-30 2001-01-02 Focused Energy Holding Inc. Focused narrow beam communication system
US5870393A (en) * 1995-01-20 1999-02-09 Hitachi, Ltd. Spread spectrum communication system and transmission power control method therefor
US6535666B1 (en) * 1995-06-02 2003-03-18 Trw Inc. Method and apparatus for separating signals transmitted over a waveguide
US5726978A (en) * 1995-06-22 1998-03-10 Telefonaktiebolaget L M Ericsson Publ. Adaptive channel allocation in a frequency division multiplexed system
US20020018157A1 (en) * 1996-04-12 2002-02-14 Semiconductor Energy Laboratory Co., Ltd., A Japanese Corporation Liquid crystal display device and method for fabricating thereof
US20050002440A1 (en) * 1997-02-24 2005-01-06 Siavash Alamouti Vertical adaptive antenna array for a discrete multitone spread spectrum communications system
US6711400B1 (en) * 1997-04-16 2004-03-23 Nokia Corporation Authentication method
US6038450A (en) * 1997-09-12 2000-03-14 Lucent Technologies, Inc. Soft handover system for a multiple sub-carrier communication system and method thereof
US20030002464A1 (en) * 1997-09-16 2003-01-02 Ramin Rezaiifar Channel structure for communication systems
US6539008B1 (en) * 1997-11-03 2003-03-25 Samsung Electronics, Co., Ltd. Method for inserting power control bits in the CDMA mobile system
US6176550B1 (en) * 1997-12-03 2001-01-23 Steelcase Development Inc. Adjustable armrest for chairs
US6175650B1 (en) * 1998-01-26 2001-01-16 Xerox Corporation Adaptive quantization compatible with the JPEG baseline sequential mode
US6198775B1 (en) * 1998-04-28 2001-03-06 Ericsson Inc. Transmit diversity method, systems, and terminals using scramble coding
US6337657B1 (en) * 1999-03-12 2002-01-08 Topcon Positioning Systems, Inc. Methods and apparatuses for reducing errors in the measurement of the coordinates and time offset in satellite positioning system receivers
US6987746B1 (en) * 1999-03-15 2006-01-17 Lg Information & Communications, Ltd. Pilot signals for synchronization and/or channel estimation
US6674787B1 (en) * 1999-05-19 2004-01-06 Interdigital Technology Corporation Raising random access channel packet payload
US6539213B1 (en) * 1999-06-14 2003-03-25 Time Domain Corporation System and method for impulse radio power control
US6363060B1 (en) * 1999-06-30 2002-03-26 Qualcomm Incorporated Method and apparatus for fast WCDMA acquisition
US20050009486A1 (en) * 1999-10-08 2005-01-13 Naofal Al-Dhahir Finite-length equalization overmulti-input multi-output channels
US6985466B1 (en) * 1999-11-09 2006-01-10 Arraycomm, Inc. Downlink signal processing in CDMA systems utilizing arrays of antennae
US20050053081A1 (en) * 1999-11-17 2005-03-10 Telefonaktiebolaget Lm Ericsson (Publ) Acceleration dependent channel switching in mobile telecommunications
US6690951B1 (en) * 1999-12-20 2004-02-10 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic size allocation system and method
US6850509B2 (en) * 2000-02-01 2005-02-01 Samsung Electronics Co., Ltd. Scheduling apparatus and method for packet data service in a wireless communication system
US6507601B2 (en) * 2000-02-09 2003-01-14 Golden Bridge Technology Collision avoidance
US20020000948A1 (en) * 2000-03-08 2002-01-03 Samsung Electronics Co., Ltd. Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system
US6529525B1 (en) * 2000-05-19 2003-03-04 Motorola, Inc. Method for supporting acknowledged transport layer protocols in GPRS/edge host application
US6701165B1 (en) * 2000-06-21 2004-03-02 Agere Systems Inc. Method and apparatus for reducing interference in non-stationary subscriber radio units using flexible beam selection
US20020015405A1 (en) * 2000-06-26 2002-02-07 Risto Sepponen Error correction of important fields in data packet communications in a digital mobile radio network
US7164696B2 (en) * 2000-07-26 2007-01-16 Mitsubishi Denki Kabushiki Kaisha Multi-carrier CDMA communication device, multi-carrier CDMA transmitting device, and multi-carrier CDMA receiving device
US6985434B2 (en) * 2000-09-01 2006-01-10 Nortel Networks Limited Adaptive time diversity and spatial diversity for OFDM
US6850481B2 (en) * 2000-09-01 2005-02-01 Nortel Networks Limited Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system
US8098569B2 (en) * 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US8098568B2 (en) * 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US6842487B1 (en) * 2000-09-22 2005-01-11 Telefonaktiebolaget Lm Ericsson (Publ) Cyclic delay diversity for mitigating intersymbol interference in OFDM systems
US6704571B1 (en) * 2000-10-17 2004-03-09 Cisco Technology, Inc. Reducing data loss during cell handoffs
US20040048609A1 (en) * 2000-12-11 2004-03-11 Minoru Kosaka Radio communication system
US6985453B2 (en) * 2001-02-15 2006-01-10 Qualcomm Incorporated Method and apparatus for link quality feedback in a wireless communication system
US6675012B2 (en) * 2001-03-08 2004-01-06 Nokia Mobile Phones, Ltd. Apparatus, and associated method, for reporting a measurement summary in a radio communication system
US7006848B2 (en) * 2001-03-23 2006-02-28 Qualcomm Incorporated Method and apparatus for utilizing channel state information in a wireless communication system
US20030020651A1 (en) * 2001-04-27 2003-01-30 Crilly William J. Wireless packet switched communication systems and networks using adaptively steered antenna arrays
US20050002468A1 (en) * 2001-05-11 2005-01-06 Walton Jay R. Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
US20030043732A1 (en) * 2001-05-17 2003-03-06 Walton Jay R. Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission
US20030073464A1 (en) * 2001-05-25 2003-04-17 Giannakis Georgios B. Space-time coded transmissions within a wireless communication network
US7492788B2 (en) * 2001-06-27 2009-02-17 Nortel Networks Limited Communication of control information in wireless communication systems
US20030036359A1 (en) * 2001-07-26 2003-02-20 Dent Paul W. Mobile station loop-back signal processing
US20030040283A1 (en) * 2001-08-21 2003-02-27 Ntt Docomo, Inc. Radio communication system, communication terminal, and method for transmitting burst signals
US20030043764A1 (en) * 2001-08-23 2003-03-06 Samsung Electronics Co., Ltd. Method for allocating HARQ channel number for indicating state information in an HSDPA communication system
US7664061B2 (en) * 2001-09-05 2010-02-16 Nokia Corporation Closed-loop signaling method for controlling multiple transmit beams and correspondingly adapted transceiver device
US20050044206A1 (en) * 2001-09-07 2005-02-24 Staffan Johansson Method and arrangements to achieve a dynamic resource distribution policy in packet based communication networks
US7164649B2 (en) * 2001-11-02 2007-01-16 Qualcomm, Incorporated Adaptive rate control for OFDM communication system
US20050002412A1 (en) * 2001-11-15 2005-01-06 Mats Sagfors Method and system of retransmission
US7177351B2 (en) * 2002-03-01 2007-02-13 Qualcomm, Incorporated Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system
US7170937B2 (en) * 2002-05-01 2007-01-30 Texas Instruments Incorporated Complexity-scalable intra-frame prediction technique
US20040002364A1 (en) * 2002-05-27 2004-01-01 Olav Trikkonen Transmitting and receiving methods
US7184713B2 (en) * 2002-06-20 2007-02-27 Qualcomm, Incorporated Rate control for multi-channel communication systems
US7483408B2 (en) * 2002-06-26 2009-01-27 Nortel Networks Limited Soft handoff method for uplink wireless communications
US20040001460A1 (en) * 2002-06-26 2004-01-01 Bevan David Damian Nicholas Soft handoff method for uplink wireless communications
US20040001429A1 (en) * 2002-06-27 2004-01-01 Jianglei Ma Dual-mode shared OFDM methods/transmitters, receivers and systems
US6985498B2 (en) * 2002-08-26 2006-01-10 Flarion Technologies, Inc. Beacon signaling in a wireless system
US20040058687A1 (en) * 2002-09-06 2004-03-25 Samsung Electronics Co., Ltd. Apparatus and method for transmitting CQI information in a CDMA communication system employing an HSDPA scheme
US7002900B2 (en) * 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US20050013263A1 (en) * 2003-01-04 2005-01-20 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving uplink data retransmission request in a CDMA communication system
US7177297B2 (en) * 2003-05-12 2007-02-13 Qualcomm Incorporated Fast frequency hopping with a code division multiplexed pilot in an OFDMA system
US20050003782A1 (en) * 2003-06-06 2005-01-06 Ola Wintzell Methods and apparatus for channel quality indicator determination
US20050008091A1 (en) * 2003-06-26 2005-01-13 Mitsubishi Denki Kabushiki Kaisha Sphere decoding of symbols transmitted in a telecommunication system
US20050041618A1 (en) * 2003-08-05 2005-02-24 Yongbin Wei Extended acknowledgement and rate control channel
US20050034079A1 (en) * 2003-08-05 2005-02-10 Duraisamy Gunasekar Method and system for providing conferencing services
US20050030886A1 (en) * 2003-08-07 2005-02-10 Shiquan Wu OFDM system and method employing OFDM symbols with known or information-containing prefixes
US20050041775A1 (en) * 2003-08-22 2005-02-24 Batzinger Thomas J. High speed digital radiographic inspection of piping
US20050047517A1 (en) * 2003-09-03 2005-03-03 Georgios Giannakis B. Adaptive modulation for multi-antenna transmissions with partial channel knowledge
US20050053151A1 (en) * 2003-09-07 2005-03-10 Microsoft Corporation Escape mode code resizing for fields and slices
US20050052991A1 (en) * 2003-09-09 2005-03-10 Tamer Kadous Incremental redundancy transmission in a MIMO communication system
US7483719B2 (en) * 2003-11-13 2009-01-27 Samsung Electronics Co., Ltd. Method for grouping transmission antennas in mobile communication system including multiple transmission/reception antennas
US20070110172A1 (en) * 2003-12-03 2007-05-17 Australian Telecommunications Cooperative Research Channel estimation for ofdm systems
US7181170B2 (en) * 2003-12-22 2007-02-20 Motorola Inc. Apparatus and method for adaptive broadcast transmission
US7483779B2 (en) * 2004-02-03 2009-01-27 Jungheinrich Aktiengesellschaft Method for the adjustment of the control current of current-controlled hydraulic valves
US20100002570A9 (en) * 2004-02-18 2010-01-07 Walton J R Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US7157351B2 (en) * 2004-05-20 2007-01-02 Taiwan Semiconductor Manufacturing Co., Ltd. Ozone vapor clean method
US20060013285A1 (en) * 2004-07-16 2006-01-19 Takahiro Kobayashi Radio communication apparatus, base station and system
US20060018347A1 (en) * 2004-07-21 2006-01-26 Avneesh Agrawal Shared signaling channel for a communication system
US20060018397A1 (en) * 2004-07-21 2006-01-26 Qualcomm Incorporated Capacity based rank prediction for MIMO design
US7676007B1 (en) * 2004-07-21 2010-03-09 Jihoon Choi System and method for interpolation based transmit beamforming for MIMO-OFDM with partial feedback
US20060018336A1 (en) * 2004-07-21 2006-01-26 Arak Sutivong Efficient signaling over access channel
US20060034173A1 (en) * 2004-07-21 2006-02-16 Qualcomm Incorporated Method of providing a gap indication during a sticky assignment
US20060029289A1 (en) * 2004-08-05 2006-02-09 Kabushiki Kaisha Toshiba Information processing apparatus and method for detecting scene change
US20060039500A1 (en) * 2004-08-17 2006-02-23 Samsung Electronics Co., Ltd. Apparatus and method for space-time-frequency block coding for increasing performance
US20060039332A1 (en) * 2004-08-17 2006-02-23 Kotzin Michael D Mechanism for hand off using subscriber detection of synchronized access point beacon transmissions
US20060039344A1 (en) * 2004-08-20 2006-02-23 Lucent Technologies, Inc. Multiplexing scheme for unicast and broadcast/multicast traffic
US20060045003A1 (en) * 2004-08-26 2006-03-02 Samsung Electronics Co., Ltd. Method for detecting initial operation mode in wireless communication system employing OFDMA scheme
US20060050770A1 (en) * 2004-09-03 2006-03-09 Qualcomm Incorporated Receiver structures for spatial spreading with space-time or space-frequency transmit diversity
US8095141B2 (en) * 2005-03-09 2012-01-10 Qualcomm Incorporated Use of supplemental assignments
US20070005749A1 (en) * 2005-06-16 2007-01-04 Qualcomm Incorporated Robust rank perdiction for a MIMO system
US20070019596A1 (en) * 2005-06-16 2007-01-25 Barriac Gwendolyn D Link assignment messages in lieu of assignment acknowledgement messages
US20070004430A1 (en) * 2005-07-04 2007-01-04 Samsung Electronics Co., Ltd. Position measuring system and method using wireless broadband (WIBRO) signal
US20070025345A1 (en) * 2005-07-27 2007-02-01 Bachl Rainer W Method of increasing the capacity of enhanced data channel on uplink in a wireless communications systems
US20070041311A1 (en) * 2005-08-18 2007-02-22 Baum Kevin L Method and apparatus for pilot signal transmission
US20090022098A1 (en) * 2005-10-21 2009-01-22 Robert Novak Multiplexing schemes for ofdma
US20120002623A1 (en) * 2005-10-27 2012-01-05 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US20090041150A1 (en) * 2007-08-09 2009-02-12 Jiann-An Tsai Method and apparatus of codebook-based single-user closed-loop transmit beamforming (SU-CLTB) for OFDM wireless systems

Cited By (233)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US9426012B2 (en) 2000-09-13 2016-08-23 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US20050078764A1 (en) * 2003-08-29 2005-04-14 Mitsubishi Denki Kabushiki Kaisha Method for transmitting optimally interleaved data in a MIMO telecommunication system
US7366249B2 (en) * 2003-08-29 2008-04-29 Mitsubishi Denki Kabushiki Kaisha Method for transmitting optimally interleaved data in a MIMO telecommunication system
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US20060018336A1 (en) * 2004-07-21 2006-01-26 Arak Sutivong Efficient signaling over access channel
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US20110009079A1 (en) * 2004-09-27 2011-01-13 Naoki Okamoto Radio transmission device
US8422478B2 (en) * 2004-09-27 2013-04-16 Sharp Kabushiki Kaisha Radio transmission device
US20110255503A1 (en) * 2004-09-27 2011-10-20 Naoki Okamoto Radio transmission device
US8416757B2 (en) * 2004-09-27 2013-04-09 Sharp Kabushiki Kaisha Radio transmission device
US7376203B2 (en) * 2004-12-13 2008-05-20 Mitsubishi Denki Kabushiki Kaisha Method for transmitting uniformly distributed data in a MIMO telecommunication system
US20060188036A1 (en) * 2004-12-13 2006-08-24 Mitsubishi Denki Kabushiki Kaisha Method for transmitting uniformly distributed data in a MIMO telecommunication system
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US20060203891A1 (en) * 2005-03-10 2006-09-14 Hemanth Sampath Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US8724740B2 (en) 2005-03-11 2014-05-13 Qualcomm Incorporated Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US20060205357A1 (en) * 2005-03-11 2006-09-14 Byoung-Hoon Kim Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US8995547B2 (en) 2005-03-11 2015-03-31 Qualcomm Incorporated Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US20060203708A1 (en) * 2005-03-11 2006-09-14 Hemanth Sampath Systems and methods for beamforming feedback in multi antenna communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US20070105503A1 (en) * 2005-03-11 2007-05-10 Byoung-Hoon Kim Systems and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US9178584B2 (en) 2005-03-11 2015-11-03 Qualcomm Incorporated System and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink MIMO channel data rates
US20100238902A1 (en) * 2005-03-16 2010-09-23 Qualcomm Incorporated Channel Structures for a Quasi-Orthogonal Multiple-Access Communication System
US20060209754A1 (en) * 2005-03-16 2006-09-21 Ji Tingfang Channel structures for a quasi-orthogonal multiple-access communication system
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US8547951B2 (en) 2005-03-16 2013-10-01 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US20060209732A1 (en) * 2005-03-17 2006-09-21 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US20060209670A1 (en) * 2005-03-17 2006-09-21 Alexei Gorokhov Pilot signal transmission for an orthogonal frequency division wireless communication system
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US20060223449A1 (en) * 2005-04-01 2006-10-05 Qualcomm Incorporated Systems and methods for control channel signaling
US9307544B2 (en) 2005-04-19 2016-04-05 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US20060233131A1 (en) * 2005-04-19 2006-10-19 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US8917654B2 (en) 2005-04-19 2014-12-23 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US20060233124A1 (en) * 2005-04-19 2006-10-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US20070211668A1 (en) * 2005-05-31 2007-09-13 Avneesh Agrawal Use of supplemental assignments to decrement resources
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US20060274836A1 (en) * 2005-06-01 2006-12-07 Hemanth Sampath Sphere decoding apparatus
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US9693339B2 (en) 2005-08-08 2017-06-27 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US20070041404A1 (en) * 2005-08-08 2007-02-22 Ravi Palanki Code division multiplexing in a single-carrier frequency division multiple access system
US9246659B2 (en) 2005-08-22 2016-01-26 Qualcomm Incorporated Segment sensitive scheduling
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US9240877B2 (en) 2005-08-22 2016-01-19 Qualcomm Incorporated Segment sensitive scheduling
US20070041464A1 (en) * 2005-08-22 2007-02-22 Byoung-Hoon Kim Selective virtual antenna transmission
US9860033B2 (en) 2005-08-22 2018-01-02 Qualcomm Incorporated Method and apparatus for antenna diversity in multi-input multi-output communication systems
US9660776B2 (en) 2005-08-22 2017-05-23 Qualcomm Incorporated Method and apparatus for providing antenna diversity in a wireless communication system
US8073068B2 (en) * 2005-08-22 2011-12-06 Qualcomm Incorporated Selective virtual antenna transmission
US8644292B2 (en) 2005-08-24 2014-02-04 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US20070047485A1 (en) * 2005-08-24 2007-03-01 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US8787347B2 (en) 2005-08-24 2014-07-22 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US20070049218A1 (en) * 2005-08-30 2007-03-01 Qualcomm Incorporated Precoding and SDMA support
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US20070071127A1 (en) * 2005-09-23 2007-03-29 Qualcomm Incorporated Method and apparatus for pilot communication in a multi-antenna wireless communication system
US8139672B2 (en) 2005-09-23 2012-03-20 Qualcomm Incorporated Method and apparatus for pilot communication in a multi-antenna wireless communication system
US9184808B2 (en) * 2005-09-29 2015-11-10 Interdigital Technology Corporation Mimo beamforming-based single carrier frequency division multiple access system
US20140036655A1 (en) * 2005-09-29 2014-02-06 Interdigital Technology Corporation Mimo beamforming-based single carrier frequency division multiple access system
US8553521B2 (en) * 2005-09-29 2013-10-08 Interdigital Technology Corporation MIMO beamforming-based single carrier frequency division multiple access system
US20100246377A1 (en) * 2005-09-29 2010-09-30 Interdigital Technology Corporation Mimo beamforming-based single carrier frequency division multiple access system
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US20070097909A1 (en) * 2005-10-27 2007-05-03 Aamod Khandekar Scalable frequency band operation in wireless communication systems
US20070097853A1 (en) * 2005-10-27 2007-05-03 Qualcomm Incorporated Shared signaling channel
US20070097927A1 (en) * 2005-10-27 2007-05-03 Alexei Gorokhov Puncturing signaling channel for a wireless communication system
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8842619B2 (en) 2005-10-27 2014-09-23 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US20070097942A1 (en) * 2005-10-27 2007-05-03 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US20070211616A1 (en) * 2005-10-27 2007-09-13 Aamod Khandekar Resource allocation for shared signaling channels
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9210651B2 (en) 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated