KR100944821B1 - Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system - Google Patents

Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system Download PDF

Info

Publication number
KR100944821B1
KR100944821B1 KR1020067009990A KR20067009990A KR100944821B1 KR 100944821 B1 KR100944821 B1 KR 100944821B1 KR 1020067009990 A KR1020067009990 A KR 1020067009990A KR 20067009990 A KR20067009990 A KR 20067009990A KR 100944821 B1 KR100944821 B1 KR 100944821B1
Authority
KR
South Korea
Prior art keywords
data
plurality
stream
slots
symbol
Prior art date
Application number
KR1020067009990A
Other languages
Korean (ko)
Other versions
KR20060086439A (en
Inventor
라마스와미 무라리
라지브 비자얀
켄트 지. 워커
라후라맨 크리쉬나무어씨
Original Assignee
콸콤 인코포레이티드
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
Priority to US51431503P priority Critical
Priority to US60/514,315 priority
Priority to US55974004P priority
Priority to US60/559,740 priority
Priority to US10/932,586 priority patent/US7221680B2/en
Priority to US10/932,586 priority
Application filed by 콸콤 인코포레이티드 filed Critical 콸콤 인코포레이티드
Publication of KR20060086439A publication Critical patent/KR20060086439A/en
Application granted granted Critical
Publication of KR100944821B1 publication Critical patent/KR100944821B1/en

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0064Rate requirement of the data, e.g. scalable bandwidth, data priority
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • H04L25/0226Channel estimation using sounding signals sounding signals per se
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037Inter-user or inter-terminal allocation
    • H04L5/0039Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046Determination of how many bits are transmitted on different sub-channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L27/2647Arrangements specific to the receiver
    • H04L27/2655Synchronisation arrangements
    • 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
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

Techniques for multiplexing multiple data streams using frequency division multiplexing (FDM) in an OFDM system are presented. M disjoint “interlaces” are formed through U usable subbands. Each interlace is a different set of S subbands. Subbands for each interlace are interlaced with subbands for each other interlace. M slots are defined for each symbol period and may be assigned slot indices from 1 to M. Slot indices are mapped to interlaces, so that (1) frequency diversity is achieved for each slot index and (2) the interlaces used for pilot transmission are variable for the interlaces used for each slot index. Distances, which improves channel estimation performance. Each data stream may be treated as fixed sized data packets and different numbers of slots may be used for each data packet depending on the coding and modulation scheme used for that data packet.

Description

Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system {FREQUENCY DIVISION MULTIPLEXING OF MULTIPLE DATA STREAMS IN A WIRELESS MULTI-CARRIER COMMUNICATION SYSTEM}

This application is filed on September 1, 2004, with the title of the invention "A Method for Multiplexing and Transmitting Multiple Multimedia Streams to Mobile Terminals over Terrestrial Radio," and US Patent Application No. 10 / 932,586, filed April 2004. US patent provisional application dated May 5, entitled "Multiplexing and Transmission of Multiple data Streams in a Wireless Multi-Carrier Communication System", and application number 60 / 559,740, and application date October 24, 2003, titled invention This is "A Method for Frequency-Division Multiplex Various Multimedia Streams for Multicast Wireless Transmission to Mobile Devices" and claims priority to US patent provisional application with application number 60 / 514,315.

TECHNICAL FIELD The present invention relates generally to communications and, more particularly, to techniques for multiplexing multiple data streams in a wireless multi-carrier communication system.

Multi-carrier communication systems use multiple carriers for data transmission. Such multiple carriers may be provided by orthogonal frequency division multiplexing (OFDM), some other multi-carrier modulation techniques, or some other configuration. OFDM effectively partitions the overall system bandwidth into multiple (N) orthogonal frequency subbands. These subbands are also referred to as tones, carriers, subcarriers, bins and frequency channels. With OFDM, each subband is associated with each subcarrier that can be modulated with data.

A base station of a multi-carrier communication system can transmit multiple data streams simultaneously. Each data stream may be processed separately (eg, coded and modulated) at the base station, and thus may be independently reconstructed (eg, demodulated and decoded) by the wireless device. Multiple data streams may have fixed or varying data rates and may use the same or different coding and modulation schemes.

Multiplexing multiple data streams for simultaneous transmission can be attempted if these streams vary (eg, have data rates and / or coding and modulation schemes that change over time). In one simple multiplexing scheme, multiple data streams are assigned to different time slots or symbol periods using time division multiplexing (TDM). In this TDM scheme, only one data stream is transmitted at any given moment, so this data stream uses all the subbands available for data transmission. This TDM scheme has undesirable characteristics. First, the amount of data that can be transmitted in the minimum time unit allocable for a given data stream, which can be seen as the "granularity" for the data stream, depends on the coding and modulation scheme used for the data stream. Different coding and modulation schemes can be associated with different sophistication, which can complicate the allocation of resources to data streams and cause inefficient resource usage. Second, if the precision for a given coding and modulation schemes is relatively too high for the decoding function of the wireless device, a large input buffer may be required at the wireless device to store the received symbols.

Therefore, there is a technical need for techniques for multiplexing multiple data streams efficiently in a multi-carrier communication system.

Techniques for multiplexing multiple data streams using frequency division multiplexing (FDM) in wireless multi-carrier (eg, OFDM) are presented herein. In one embodiment, M disjoint or non-overlapping “interlaces” are formed over U subbands usable for transmission (where M> 1 and U> 1). . Interlaces are not overlapped because each usable subband is contained within only one interlace. Each interlace is a different set of S subbands, where U = M.S. The S subbands in each interlace may be selected from the S 'subbands evenly distributed across the N total subbands and spaced at equal intervals by the M subbands (where N = M S 'and S'> = S). This interlaced subband structure can provide frequency diversity and simplify processing at the receiver. For example, a receiver may perform a "partial" S'-point fast Fourier transform (FFT) on each interlace of interest, instead of a full N-point Fourier transform (FFT). M interlaces may be used to transmit multiple data streams in an FDM manner. In one embodiment, each interlace is used by only one data stream in each symbol period, and up to M data streams may be transmitted over M interlaces in each symbol period.

In one embodiment, multiple data streams are assigned to "slots," each slot being a transmission unit equivalent to one interlace in one symbol period. M slots are available in each symbol period and may be assigned slot indices from 1 to M. Each slot index may be mapped to one interlace in each symbol period based on a slot-to-interlace mapping scheme. One or more slot indices may be used for the FDM pilot, and the remaining slot indices may be used for data transmission. Slot-to-interlace mapping can be made such that the interlaces used for pilot transmission have varying distances for the interlaces used for each slot index in different OFDM symbol periods. This allows all slot indices used for data transmission to achieve similar channel estimation performance.

Each data stream can be treated as data packets of fixed size. In this case, different numbers of slots may be used for each data packet depending on the coding and modulation scheme used for that data packet. Alternatively, each data stream can be treated as data packets with varying sizes. For example, packet sizes may be selected such that an integer number of data packets are sent in each slot. In any case, if multiple data packets are transmitted in a given slot, the data symbols for each data packet can be distributed over all subbands used for the slot, resulting in each data packet transmitted in the slot. Frequency diversity is achieved with respect.

Various aspects and embodiments of the invention are described in more detail below.

The features and characteristics of the present invention will become more apparent from the following detailed description and drawings.

1 shows a block diagram for a base station and a wireless device.

2 shows an exemplary super-frame structure.

3 shows an interlaced subband structure.

4A and 4B show “staggered” and “cycled” FDM pilots, respectively.

5 illustrates an example mapping of slot indices and interlaces.

6 shows coding of a data block using an outer code.

7A and 7B illustrate the transmission of packets in different modes.

8A and 8B illustrate dividing a different number of packets into slots.

9A shows a block diagram of a transmit (TX) data processor.

9B shows a block diagram of a modulator.

10A shows a block diagram of a demodulator.

10B shows a block diagram of a receive (RX) data processor.

The word "examplary" is used herein to mean "presenting as an example, illustration or explanation." Any embodiment or design described herein as "exemplary" is not to be construed as preferred or advantageous over other embodiments or designs.

The multiplexing techniques presented herein may be used for various wireless multi-carrier communication systems. These techniques can also be used for the uplink as well as the downlink. The downlink (or forward link) refers to the communication link from base stations to wireless devices, and the uplink (or reverse link) refers to the communication link from wireless devices to base stations. For clarity, these techniques will be described below for the downlink in an OFDM-based system.

1 shows a block diagram of a base station 110 and a wireless device 150 in a wireless system 100 using OFDM. Base station 110 is generally a fixed station and may also be referred to as a base transceiver system (BTS), an access point, a transmitter, or some other terminology. Wireless device 150 may be fixed or mobile and may be referred to as a user terminal, mobile station, receiver, or some other terminology. Wireless device 150 may also be a portable unit such as a cellular phone, a handheld device, a wireless module, a personal digital assistant (PDA), or the like.

At base station 110, TX data processor 120 receives multiple (T) data streams (or “traffic” data) and processes each data stream (eg, encoding, to generate data symbols). Interleaving and symbol mapping). As used herein, "data symbol" is a modulation symbol for traffic data, "pilot symbol" is a modulation symbol for pilot (a priori known data for both the base station and the wireless device), and the modulation symbol is a modulation scheme. It is the complex value for one point in the signal array for (e.g., M-PSK, M-QAM, etc.). TX data processor 120 also multiplexes the data symbols and pilot symbols for the T data streams into the appropriate subbands to provide a composite symbol stream. Modulator 130 performs OFDM modulation on the multiplexed symbols in the composite symbol stream to produce OFDM symbols. Transmitter unit (TMTR) 132 further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to convert OFDM symbols to analog signals and produce a modulated signal. Base station 110 then transmits the modulated signal from antenna 134 to wireless devices in the system.

In wireless device 150, a signal transmitted from base station 110 is received by antenna 152 and provided to a receiver unit (RCVR) 154. Receiver unit 154 digitizes the adjusted signal to adjust (eg, filter, amplify and frequency downconvert) the received signals and generate a stream of input samples. Demodulator 160 performs OFDM demodulation on input samples to obtain received symbols for one or more data streams of interest, and further detects (e.g., receives the received symbols to obtain detected data symbols). Equalization or matching filtering), wherein the detected data symbols are estimates for the data symbols transmitted by the base station 110. The RX data processor 170 then processes (eg, symbol demaps, deinterleaves, and decodes) the detected symbol streams for each selected data stream and provides decoded data for that stream. Processing by demodulator 160 and RX data processor 170 is complementary to processing by modulator 130 and TX data processor 120 at base station 110.

Controllers 140 and 180 supervise operation at base station 110 and wireless device 150, respectively. Memory units 142 and 182 provide storage for program codes and data used by controllers 140 and 180, respectively. Controller 140 or scheduler 144 may allocate system resources for the T data streams.

Base station 110 may transmit T data streams for various services, such as broadcast, multicast, and / or unicast services. Broadcast transmissions are sent to all wireless devices within a specified coverage area, multicast transmissions are sent to a group of wireless devices, and unicast transmissions are sent to a specific wireless device. For example, base station 110 may broadcast multiple data streams for multimedia (eg, television) programs and multimedia content such as video, audio, teletext, data, video / audio clips, and the like. . One multimedia program can be broadcast as three separate data streams for video, audio and data. This allows the video, audio and data portions of the multimedia program to be received independently at the wireless device.

2 illustrates an example super-frame structure 200 that may be used in the system 100. T data streams can be transmitted within a super-frame, with each super-frame having a predetermined time period. Super-frames may also be referred to as frames, time slots, or some other terminology. In the embodiment shown in FIG. 2, each super-frame includes a field 212 for one or more TDM pilots, a field 214 for overhead / control data, and a field 216 for traffic data. The TDM pilot (s) may be used by the wireless device for synchronization (eg, frame detection, frequency error estimation, timing acquisition, etc.). The overhead / control data indicates various parameters for the T data streams (eg, the coding and modulation scheme used for each data stream, the specific location of each data stream within the super-frame, etc.). can do. T data streams are sent in field 216. Although not shown in FIG. 2, each super-frame may be divided into multiple (eg, four) same-sized frames to facilitate data transfer. Other frame structures may also be used for the system 100.

3 illustrates an interlaced subband structure 300 that may be used in system 100. System 100 uses an OFDM structure with N total subbands. U subbands may be used for data and pilot transmission and are referred to as “usable” subbands (where U <= N). The remaining G subbands are not used and are referred to as "guard" subbands (where N = U + G). By way of example, system 100 may use an OFDM structure having all subbands of N = 4096, usable subbands of U = 4000, and guard subbands of G = 96.

U usable subbands may be arranged in M interlaces or disjoint subband sets. The M interlaces are not disjointed or overlapped because each of the U usable subbands belongs to only one interlaces. Each interlace contains S usable subbands (where U = M.S). Each interlace may be associated with a different group of S '= N / M subbands that are uniformly distributed across the N total subbands, such that consecutive subbands within the group are located by M subbands apart. Done. For example, group 1 may include subband 1, M + 1, 2M + 1, etc., group 2 may include subbands 2, M + 2, 2M + 2, etc., and group M may include Subbands M, 2M, 3M, and the like. In each group, S of the S 'subbands are usable subbands and the remaining S'-S subbands are guard subbands. Each interlace may then include the S available subbands in the group associated with it. In the example OFDM structure described above, M = 8 interlaces may be formed, with each interlace selected from S ′ = 512 subbands spaced at equal intervals by M = 8 subbands. Two usable subbands. Thus, the S usable subbands in each interlace are interlaced with the S usable subbands in each of the other M-1 interlaces.

In general, a system can use any OFDM structure with any number of total subbands, usable subbands, and guard subbands. In addition, any number of interlaces may be formed. Each interlace may include any number of usable subbands and any of the U usable subbands. Interlaces can also include the same or different numbers of usable subbands. For simplicity, the following description is made for the interlacing subband structure shown in FIG. 3, which has S interleaved subbands with M interlaces and each interlace uniformly distributed. This interlaced subband structure provides several advantages. First, frequency diversity is achieved because each interlace includes usable subbands taken over the entire system bandwidth. Second, the wireless device can recover the data / pilot symbols transmitted over a given interlace by performing a partial S'-point FFT instead of the full N-point FFT, which can simplify the processing of the wireless device.

Base station 110 may transmit an FDM pilot over one or more interlaces to allow wireless devices to perform various functions, such as, for example, channel estimation, frequency tracking, time tracking, and the like. The base station 110 may transmit FDM pilot and traffic data in various ways.

4A shows a data and pilot transmission scheme 400 with a “stagger” FDM pilot. In the case of M = 8, one interlace is used for the FDM pilot in each symbol period, and the remaining seven interlaces are used for traffic data. The FDM pilot is transmitted on two designated interlaces in an alternative manner, with the result that the pilot symbols are over one interlace (e.g. interlace 3) in odd symbol periods and another interlace (e.g. in even symbol periods). For example, it is transmitted through interlace 7). The two interlaces used for the FDM pilot are staggered or offset by M / 2 = 4 interlaces. This staggering allows wireless devices to observe the channel response for more subbands, which can improve performance.

4B shows a data and pilot transmission scheme 410 with an "cycled" FDM pilot. In the case of M = 8, one interlace is used for the FDM pilot in each symbol period and the remaining seven interlaces are used for traffic data. The FDM pilot is sent on all eight interlaces in a circular fashion, with the result that pilot symbols are sent on different interlaces during each M-symbol period. For example, an FDM pilot is transmitted over interlace 1 in symbol period 1, interlace 5 in symbol period 2, interlace 2 in symbol period 3, and also in the following symbol periods in the same manner and transmitted over interlace 8 in symbol period 8 Thereafter, it is transmitted on interlace 1 again in symbol period 9 and also in subsequent symbol periods in the same manner. This cycling allows the wireless devices to observe the channel response for all available subbands.

In general, an FDM pilot may be sent on any number of interlaces and on any of the M interlaces in each symbol period. The FDM pilot can also be sent using any pattern, two of which are shown in FIGS. 4A and 4B.

Base station 110 may transmit T data streams over M interlaces in various ways. In the first embodiment, each data stream is transmitted on the same one or more interlaces in each symbol period in which the data stream is transmitted. In this embodiment, interlaces are fixedly assigned to each data stream. In a second embodiment, each data stream may be sent on different interlaces in different symbol periods in which the data stream is sent. In such an embodiment, interlaces are dynamically assigned to each data stream, thereby improving frequency diversity and ensuring that the quality of the channel is independent of the slot index or indices assigned to the data stream. The second embodiment can be seen in the form of frequency hopping, which is described in more detail below.

In order to average the channel estimation and detection performance for all T data streams, the transmission scheme 410 can be used for the first embodiment with fixedly assigned interlaces, and the transmission scheme 400 or 410 It can be used for the second embodiment with dynamically allocated interlaces. If an FDM pilot is sent over the same one interlace (referred to as pilot interlace) in each symbol period and used to obtain channel estimates for all M interlaces, the channel for the interlace closer to the pilot interlace Estimation is typically better than channel estimation for interlaces far from the pilot interlace. If the data stream continues to be assigned interlaces far from the pilot interlace, the detection performance for the data stream may be degraded. Allocation of interlaces with varying distances (or spacing or offset) to the pilot interlace can avoid this performance degradation due to channel estimation bias.

In the second embodiment, M slots may be defined for each symbol period, and each slot may be mapped to one interlace in one symbol period. Slots usable for traffic data are also referred to as data slots, and slots usable for FDM pilot are also referred to as pilot slots. M slots in each symbol period may be assigned an index from 1 to M. Slot index 1 may be used for the FDM pilot, and slot indexes 2 through M may be used for data transmission. T data streams may be allocated to slots having indices of 2 to M in each symbol period. The use of slots with fixed indices can simplify the assignment of slots to data streams. The M slot indices may be mapped to M interlaces in each symbol period based on any mapping scheme that may achieve the desired frequency diversity and channel estimation performance.

In the first slot-to-interlace mapping scheme, slot indices are mapped to interlaces in a permutated manner. In the transmission scheme 400 in which M = 8 and one pilot slot and seven data slots in each symbol period, the mapping may be performed as follows. The eight interlaces may be represented by an initial sequence {I 1 , I 2 , I 3 , I 4 , I 5 , I 6 , I 7 , I 8 }. The substituted sequence may be formed by {I 1 , I 5 , I 3 , I 7 , I 2 , I 6 , I 4 , I 8 }. The i th interlace in the initial sequence is placed in the i br th position in the substituted sequence (where i ∈ {1... 8}, i br ∈ {1... 8}), and (i br -1) Is the bit index of (i-1). Since these indices start at 1 instead of 0, an offset of -1 is used for i and i br . For example, when i = 7 and (i-1) = 6, the bit representation is '110', the bit-inversion index is '011', (i br -1) = 3 and i br = 4 to be. The seventh interlace of the initial sequence is thus placed in the fourth position in the substituted sequence. The two interlaces used for the FDM pilot are then combined in the substituted sequence to form a shortened interlace sequence {I 1 , I 5 , I 3/7 , I 2 , I 6 , I 4 , I 8 }. . The kth slot index (or kth data slot index) (where k ({2... 8}) for data transmission is then mapped to the (k-1) th interlace in the shortened interlace sequence. Then, for each symbol period, the shortened interlace sequence is cyclically shifted to the right by two positions and enclosed to the left. The k th data slot index is mapped back to the (k-1) th interlace in the shortened interlaced sequence that is cyclically shifted.

5 shows mapping of slot indices and interlaces for the first mapping scheme described above. Slot index 1, used for the FDM pilot, is mapped to interlaces 3 and 7 via alternating symbol periods for the transmission scheme 400. Slot indices 2 through 8 for data include seven interlaces in the shortened interlace sequence {I 1 , I 5 , I 3/7 , I 2 , I 6 , I 4 , I 8 } during the first symbol period. Mapped to seven interlaces for the shortened interlaced sequence {I 4 , I 8 , I 1 , I 5 , I 3/7 , I 2 , I 6 } cyclically shifted during the second symbol period. . As shown in FIG. 5, each data slot index is mapped to seven different interlaces in seven consecutive symbol periods, one of the seven interlaces being interlace 3 or 7. After that all seven data slot indexes will achieve similar performance.

In the second slot-to-interlace mapping scheme, slot indices are matched with the interlaces in a pseudo-random manner. A pseudo-random number (PN) generator can be used to generate PN numbers used to map slot indices with interlaces. The PN generator may be implemented via a linear feedback shift register (LFSR) that implements a particular generation polynomial such as, for example, g (x) = x 15 + x 14 +1. For each symbol period j, the LFSR is updated and the V least significant bits (LSBs) in the LFSR may be denoted as PN (j) (where j = 1,2,... And V = log 2). M). The k th data slot index (k∈ {2... M}) is interlaced [(PN (j) + k) unless interlace [(PN (j) + k) mod M] +1 is used for the FDM pilot. ) may be mapped to mod M] +1, otherwise it may be mapped to interlace [(PN (j) + k + 1) mod M] +1.

In a third slot-to-interlaced mapping scheme, slot indices are mapped with interlaces in a circular fashion. For each symbol period j, the k th data slot index (k∈ {2... M}) is interlaced [(j + k) may be mapped to mod M] +1, otherwise it may be mapped to interlace [(j + k + 1) mod M] +1.

M slot indices may thus be mapped to M interlaces in various ways. Some example slot-to-interlace mapping schemes have been described above. Other mapping schemes may also be used, which is within the scope of the present invention.

Slots may be allocated to T data streams in various ways. In the first slot allocation scheme, each data stream is allocated with a sufficient number of slots in each super-frame to transmit non-negative integer data packets (ie zero or more data packets). In this manner, data packets can be defined to have a fixed size (ie, a predetermined number of information bits), thereby simplifying the coding and decoding for the data packets. Each fixed size data packet may be coded and modulated to produce a coded packet having a varying size that depends on the coding and modulation scheme used for the packet. The number of slots needed to transmit a coded packet depends on the coding and modulation scheme used for the packet.

In the second slot allocation scheme, each data stream may be allocated to non-negative integer slots in each super-frame, and integer data packets may be sent in each assigned slot. The same coding and modulation scheme can be used for all data packets transmitted in any given slot. Each data packet may have a size that depends on (1) the number of data packets transmitted in the slot and (2) the coding and modulation scheme used for the slot. In this way, data packets can have varying sizes.

Slots may also be allocated for data streams in other ways. For clarity, the following description assumes that the first slot allocation scheme is used by the system.

Each data stream can be coded in a variety of ways. In one embodiment, each data stream may be coded using concatenated code consisting of an outer code and an inner code. The outer code may be a block code, such as a Reed-Solomon (RS) code or some other code. The inner code may be a turbo code, a convolution code or some other code.

6 illustrates an example outer coding scheme using Reed-Solomon outer code. The data stream is divided into data packets. In one embodiment, each data packet has a fixed size and includes a predetermined number of information bits or L information bytes (eg, 1000 bits or 125 bytes). Data packets for a data stream are written to rows of memory, one packet per row. After K rs data packets are written to K rs rows, block coding is performed column-wise one column at a time. In one embodiment, each column is coded using the (N rs , K rs ) Reed-Solomon code to generate a corresponding codeword containing K rs bytes (one byte per row) and N rs bytes. do. First K rs of Codewords The byte is a data byte (also referred to as a systematic byte) and the remaining N rs -K rs bytes are parity bytes (which can be used by the wireless device for error correction). Reed-Solomon coding generates N rs -K rs parity bytes for each codeword, where the parity bytes are K rs of data. After the rows are written to the rows N rs -K rs to N rs of the memory. RS block is the K rs of data It contains rows and N rs -K rs rows of parity. In one embodiment, N rs = 16 and K rs is a configurable parameter, for example, K rs ∈ {12,14,16}. The Reed-Solomon code is disabled if K rs = N rs . Each data / parity packet (or each row) of the RS block is then coded by a turbo inner code to produce a corresponding coded packet. The code block comprises N rs of coded packets for the N rows of the RS block rs.

N rs coded packets for each code block may be transmitted in various ways. For example, each code block may be sent in one super-frame. Each super-frame can be divided into multiple (eg four) frames. Each code block may then be divided into multiple (eg, four) sub-blocks, and each sub-block of the code block may be transmitted in one frame of the super-frame. Transmitting each code block in multiple portions of a super-frame can provide time diversity.

Each data stream may be sent through hierarchical coding or without hierarchical coding, where the term “coding” refers to channel coding rather than data coding at the transmitter. The data stream may consist of two substreams, which are referred to as a base stream and an enhancement stream. The base stream may carry basic information and may be sent to all wireless devices within the coverage area of the base station. The enhancement stream may carry additional information and may be sent to wireless devices that maintain better channel conditions. Through hierarchical coding, the elementary stream is coded and modulated to produce a first modulation symbol stream, and the enhancement stream is coded and modulated to produce a second modulation symbol stream. The same or different coding and modulation schemes may be applied for the base stream and enhancement stream. The two modulation symbol streams are then scaled and combined to obtain one data symbol stream.

Table 1 shows an exemplary set of eight “modes” that can be supported by the system 100. These eight modes are provided at indexes 1-8. Each mode is associated with a particular modulation scheme (eg QPSK or 16-QAM) and a particular internal code rate (eg 1/3, 1/2 or 2/3). The first five modes are for "regular" coding using only elementary streams, and the next three modes are for hierarchical coding using elementary and enhancement streams. For simplicity, the same modulation scheme and inner code rate are used for both the basic and enhancement streams for each hierarchical coding mode.

Table 1

Figure 112006035878562-pct00001

The fourth column of Table 1 shows the number of slots required to transmit one fixed size data packet in each mode. Table 1 assumes a data packet size of 2 · S information bits and S usable subbands per slot (eg S = 500). Since the slot is mapped to one interlace with S usable subbands and each subband can carry one data symbol, the capacity of each slot has S data symbols. In mode 1, a data packet having 2 S information bits is coded using an internal code whose rate is 1/3 to generate 6 S code bits, and the coding bits are 3 S data using QPSK. Mapped to symbols. Three S data symbols for a data packet can be transmitted in three slots, with each slot carrying S data symbols. Similar processing can be performed for each of the other modes in Table 1.

Table 1 shows an exemplary design. In addition, data packets of other sizes (eg, 500 information bits, 2000 information bits, etc.) may also be used. Also, for example, multiple packet sizes may be used, such that each packet may be sent in an integer number of slots. For example, a packet size with 1000 information bits may be used for modes 1, 2 and 4, and a packet size with 1333 information bits may be used for modes 3 and 5. In general, the system may also support any number of modes, any number of data packet sizes, and any packet sizes for any number of coding and modulation schemes.

FIG. 7A shows transmitting, for each of the first five modes shown in Table 1, the minimum integer number of data packets using one slot in each of the integer number of symbol periods. One data packet may be transmitted using (1) three symbol periods in mode 1, (2) two symbol periods in mode 2, and (3) one slot in one symbol period in mode 4 . In mode 3, since each data packet takes 1.5 slots for transmission, two data packets can be sent using one slot in three symbol periods. In mode 5, since each data packet takes 0.7 slots for transmission, four data packets can be transmitted using one slot in three symbol periods.

7B shows transmitting, for each of the first five modes shown in Table 1, the minimum integer number of data packets using integer slots in one symbol period. One data packet may be transmitted in one symbol period using (1) three slots in mode 1, (2) two slots in mode 2, and (3) one slot in mode 4. In mode 3, two data packets may be transmitted in one symbol period using three slots. In mode 5, four data packets may be transmitted in one symbol period using three slots.

As shown in Figures 7A and 7B, the minimum number of data packets may be sent in various ways for each mode (except mode 4). Sending the smallest number of data packets in a short time period reduces the amount of ON time required to receive the data packets but provides less time diversity. The opposite is true when transmitting the minimum number of data packets over a long period of time.

8A shows splitting one coded packet into three slots in mode 1. FIG. Three slots may exist for three different interlaces in one symbol period or for one interlace in three different symbol periods. Three slots can maintain different channel conditions. The bits of the coded packet may be interleaved (ie relocated) before being divided into three slots. Interleaving for each coded packet can randomize the signal-to-noise ratios (SNRs) of the bits over the coded packet, thereby improving decoding performance. Interleaving can be performed in a variety of ways as is known in the art. Interleaving may also ensure that adjacent bits of a coded packet are not transmitted in the same data symbol.

8B shows splitting four coded packets into three slots in mode 5. FIG. Three slots may be filled by four coded packets sequentially as shown in FIG. 8B. If multiple coded packets share a slot (as is the case for modes 3 and 5), all the bits to be sent in the slot can be interleaved, so that the bits for each coded packet sent in the slot are slots. It can be distributed to the subbands used for. Interleaving through each slot can provide frequency diversity for each coded packet transmitted in the slot and can improve decoding performance.

Interleaving through slots can be performed in a variety of ways. In one embodiment, the bits for all coded packets to be transmitted in a given slot are initially mapped with data symbols, and the data symbols are mapped to subbands used for the slot in a substitution manner. In symbol-to-subband mapping, a first sequence having S 'sequential values 0 through S'-1 is initially formed. A second sequence of S 'values is then generated such that the i th value in the second sequence is equal to the bit reverse of the i th value of the first sequence. All values equal to or greater than S 'in the second sequence are removed to obtain a third sequence having S values in the range of 0 to S-1. Each value in the third sequence is incremented by 1 to obtain a sequence of S displaced index values in the range of 1 to S, denoted F (j). The j th data symbol of the slot may be mapped to the F (j) th subband of the interlace used for the slot. For example, if S = 500 and S '= 512, the first sequence is {0,1,2,3 ,. . . , 510,511}, the second sequence is {0, 256, 128, 384,. . . , 255,511}, the third sequence is {0, 256, 128, 384,. . . , 255}. The sequence F (j) is only needed once for the calculation and can be used for all slots. Other mapping schemes may also be used for symbol-to-subband mapping to achieve interleaving through each slot.

In general, each data stream can carry any number of data packets in each super-frame, depending on the data rate of the stream. Each data stream is allocated to a sufficient number of slots in each super-frame based on its data rate, and the data rate depends on the availability of slots and other possible factors. For example, each data stream may be limited to the maximum number of slots specified in each symbol period, with the maximum number of slots dependent on the mode used for the data stream. Each data stream may be limited to a particular maximum data rate, where the maximum data rate is the maximum number of bits of information that can be transmitted in each symbol period for the data stream. The maximum data rate is typically set by the decoding and buffering functions of wireless devices. Limiting each data stream to within the maximum data rate ensures that the data stream can be recovered by wireless devices having defined decoding and buffering functions. The maximum data rate limits the number of data packets that can be sent in each symbol period for the data stream. The maximum number of slots may be determined by the maximum number of data packets and the mode used for the data stream.

In one embodiment, each data stream may be assigned to an integer number of slots in any given symbol period, with multiple data streams not sharing an interlace. In this embodiment, it is assumed that up to M-1 data streams may be transmitted through M-1 data slots in each symbol period, with one slot being used for the FDM pilot. In another embodiment, multiple data streams may share an interlace.

9A shows a block diagram of one embodiment of TX data processor 120 at base station 110. TX data processor 120 is configured for T TX data stream processors 910a through 910t for T data streams, TX overhead data processor 930 for orderhead / control data, for TDM and FDM pilots. Pilot processor 932 and multiplexer (Mux) 940. Each TX data stream processor 910 processes each data stream {d i } to produce a corresponding data symbol stream {Y i } (where i ∈ {1... T}).

Within each TX data stream processor 910, encoder 912 receives and encodes data packets for its data stream {d i } and provides coded packets. The encoder 912 performs encoding in accordance with, for example, a concatenated code consisting of a Reed-Solomon outer code and a turbo or convolutional inner code. In this case, encoder 912 encodes each block of K rs data packets to produce N rs coded packets as shown in FIG. Encoding increases the reliability of the transmission for the data stream. The encoder 912 also generates a cyclic redundancy check (CRC) value and adds it to each coded packet, which CRC value is for error correction (i.e., to determine whether the packet was decoded correctly or if there was an error). ) Can be used by a wireless device. Encoder 912 may also shuffle coded packets.

Interleaver 914 receives the coded packets from encoder 912 and interleaves the bits of each coded packet to generate an interleaved packet. Interleaving provides time and / or frequency diversity for packets. Slot buffer 916 is filled with interleaved packets for all slots allocated to the data stream, as shown, for example, in FIGS. 8A and 8B.

The scrambler 918 receives the bits for each slot and scrambles with the PN sequence to randomize the bits. M different PN sequences may be used for the M slot indices. M PN sequences may be generated via a linear feedback shift register (LFSR) that implements a particular generation polynomial such as, for example, g (x) = x 15 + x 14 +1. The LFSR can be loaded with a different 15-bit initial value for each slot index. In addition, the LFSR may be reloaded at the start of each symbol period. The scrambler 918 may perform an exclusive-OR on one bit in the PN sequence and each bit in the slot to generate scrambled bits.

The bit-to-symbol mapping unit 920 receives the scrambled bits for each slot from the scrambler 918 and converts the bits and modulation symbols according to a modulation scheme (eg, QPSK or 16-QAM). It provides mapping and provides data symbols for the slots. Symbol mapping involves (1) grouping a set of B bits to form B-bit binary values (where B> = 1), and (2) assigning each B-bit binary value to a signal arrangement for the modulation scheme. This can be accomplished by mapping complex values for one point that is present. The external and internal codes for encoder 912 and the modulation scheme for mapping unit 920 are determined by the mode used for the data stream.

If the data stream is transmitted using hierarchical coding, the elementary stream may be processed by one set of processing units 912-920 to produce a first stream of modulation symbols, and the enhancement stream may be 9 may be processed by another set of processing units 912-920 to produce a second stream of modulation symbols (not shown in FIG. 9). As shown in Table 1, the same coding and modulation scheme may be used for both the base stream and enhancement stream, or different coding and modulation schemes may be used for the two streams. The combiner can then receive and combine the first and second modulation symbol streams to generate data symbols for the data stream. Hierarchical coding can also be performed in other ways. For example, scrambled bits for both the elementary and enhancement streams may be provided in one bit-to-symbol mapping unit that provides data symbols for the data stream.

The slot-to-interlace mapping unit 922 is adapted to interlace with each slot assigned to the data stream based on the slot-to-interlace mapping scheme used by the system (eg, as shown in FIG. 5). Map. The symbol-to-subband mapping unit 924 then maps the S data symbols in each slot with the appropriate subbands in the slot mapped interlace. Symbol-to-subband mapping may be performed in a manner that distributes S data symbols across the S subbands used for the slot, as described above. Mapping unit 924 provides data symbols for data stream {d i }, which are mapped with the appropriate subbands used for the data stream.

TX overhead data processor 930 processes the overhead / control data and provides overhead symbols according to the coding and modulation scheme used for the overhead / control data. Pilot processor 932 performs processing on the TDM and FDM pilots and provides pilot symbols. Multiplexer 940 includes mapped data symbols for T data streams from TX data stream processors 910a through 910t, overhead symbols from TX overhead data processor 930, pilot processor 932. Receive pilot symbols and guard symbols from the. The multiplexer 940 provides data symbols, overhead symbols, pilot symbols, and guard symbols in the appropriate subbands and symbol periods based on the MUX_TX control from the controller 140 and synthesized symbol stream {Y C }. Outputs

9B is a block diagram of one embodiment of a modulator 130 of base station 110. Modulator 130 includes a fast Fourier inverse transform (IFFT) unit 950 and a cyclic prefix generator 952. During each symbol period, the IFFT unit 950 time-domains the N symbols for the N total subbands via the N-point IFFT to obtain a "converted" symbol containing N time-domain samples. Convert to To prevent inter-symbol interference (ISI) caused by frequency selective fading, cyclic prefix generator 952 repeats the portion (or C samples) of each transformed symbol to include N + C samples. Form a corresponding OFDM symbol. Repeated portions are often referred to as cyclic prefixes or guard intervals. For example, the length of the cyclic prefix may be C = 512 for N = 4096. Each OFDM symbol is transmitted in one OFDM symbol period (or simply symbol period), which is an N + C sample period. Cyclic prefix generator 952 provides an output sample stream {y} for composite symbol stream {Y C }.

10A shows a block diagram of one embodiment of a demodulator 160 of wireless device 150. Demodulator 160 includes a cyclic prefix controller unit 1012, a Fourier transform unit 1014, a channel estimator 1016 and a detector 1018. The cyclic prefix controller unit 1012 removes the cyclic prefix from each received OFDM symbol and provides a sequence of N input samples {x (n)} for the received OFDM symbol. The Fourier transform unit 1014 performs a partial Fourier transform on the input sample sequence {x (n)} for each selected interlace m and performs a set of S received symbols {X m (k)} for the interlace. (Where m = 1.. M). Channel estimator 1016 estimates the channel gain for each selected interlace m based on the input sample sequence {x (n)}.

Figure 112009000080742-pct00002
Acquire it. Detector 1018 estimates channel gain for each selected interlace
Figure 112009000080742-pct00003
Perform detection (eg, equalization or matching filtering) on the set of S received symbols {X m (k)} for each selected interlace using S detected data symbols with the interlace
Figure 112009000080742-pct00004
To provide.

10B shows a block diagram of one embodiment of an RX data processor 170 of wireless device 150. Multiplexer 1030 receives detected data symbols for all interlaces from detector 1018, performs multiplexing of detected data and overhead symbols during each symbol period based on MUX_RX control, and each of interest Provide the detected data symbol streams to each RX data stream processor 1040, and provide the detected overhead symbol streams to the RX overhead data processor 1060.

Within each RX data stream processor 1040, subband-to-symbol demapping unit 1042 maps the received symbol on each subband of the selected interlace to the appropriate location in the slot. Interlace-to-slot demapping unit 1044 maps to each selected interlace and the appropriate slot. The symbol-to-bit demapping unit 1046 maps the received symbols for each slot with code bits. Descrambler 1048 descrambles the code bits for each slot and provides descrambled data. Slot buffer 1050 buffers one or more slots of descrambled data, performs reassembly of packets as needed, and provides descrambled packets. Deinterleaver 1052 deinterleaves each descrambled packet and provides a deinterleaved packet. The decoder 1054 decodes the deinterleaved packets and provides the decoded data packets to the data stream {d i }. In general, the processing performed by units within RX data stream processor 1040 is complementary to the processing performed by corresponding units within TX data stream processor 910 of FIG. 9A. Symbol-to-bit demapping and decoding are performed depending on the mode used for the data stream. RX overhead data processor 1060 processes the received overhead symbols and provides decoded overhead data.

Due to the periodic structure of the M interlaces, the Fourier transform unit 1014 determines the partial S 'for the interlace to obtain a set of S received symbols {X m (k)} for each selected interlace m. Point Fourier transform can be performed. The Fourier transform for S 'subbands containing all S subbands of interlace m (where m = 1.. M) can be expressed as follows:

Figure 112006035878562-pct00005

Where x (n) is the input sample for sample period n,

Figure 112006035878562-pct00006
And N = M · S '. The following terms may be defined as follows:

Figure 112006035878562-pct00007

Figure 112006035878562-pct00008

here,

Figure 112008015244558-pct00009
silver
Figure 112008015244558-pct00010
Is a rotated sample obtained by rotating the input sample x (n) by
Figure 112008015244558-pct00011
Is a phasor that varies from sample to sample (-1 in the exponent for m-1 and n-1 is by index numbering, starting at 1 instead of 0); And g m (n) is a time-domain value obtained by accumulating M rotated samples that are separated by S ′ samples.

Equation (1) can be expressed as follows:

Figure 112006035878562-pct00012

The partial S'-point Fourier transform for interlace m may be performed as follows. Each of the N input samples in the sequence {x (n)} for one symbol period is initially shown in equation (2).

Figure 112008015244558-pct00013
Sequence of N rotated samples rotated by
Figure 112008015244558-pct00014
Acquire. The rotated samples are then accumulated in the S 'sets of M rotated samples to obtain S' time-domain values {g m (n)} as shown in equation (3). Each set is a sequence
Figure 112008015244558-pct00015
Contains samples rotated every S'ths, and S 'sets are sequence
Figure 112008015244558-pct00016
It relates to different starting rotating samples in. A normal S'-point Fourier transform is then performed through S 'time domain values {g m (n)} to obtain S' received symbols for interlace m. Received symbols for S usable subbands are retained and received symbols for S'-S unused subbands are discarded.

For channel estimation, the partial S'-point Fourier transform is an interlace p used for the FDM pilot to obtain a set of S received pilot symbols, {X p (k)} or X (M · k + p). Can be performed over N input samples for. The modulation on the received pilot symbols is then channel gain estimates for the subbands of interlace p as follows.

Figure 112006035878562-pct00017
Is removed to obtain:

Figure 112006035878562-pct00018

Where P (M.k + p) is a known pilot symbol for the kth subband of interlace p, and " * " represents a conjugate complex number. Equation (5) assumes that all S 'subbands are used for pilot transmission. The S'-point IFFT then performs channel gain estimates to obtain a sequence of S 'modulated time-domain channel gain values {h p (n)}.

Figure 112006035878562-pct00019
{H p (n)} can be expressed as:
Figure 112006035878562-pct00020
Where n = 1.. S '. The channel gain values in the sequence {h p (n)} are then followed by a sequence of S 'derotated time-domain channel gain values.
Figure 112006035878562-pct00021
(Where n = 1... S ') to obtain
Figure 112006035878562-pct00022
Derotate by multiplication with

The channel gain estimates for the subbands of interlace m can be expressed as follows:

Figure 112006035878562-pct00023

As shown in Equation 6, the channel gain estimates for the subbands of interlace m are a sequence of S 'rotated channel gain values.

Figure 112006035878562-pct00024
Each derotated time-domain channel gain value in the sequence {h (n)} is initially derived to obtain
Figure 112006035878562-pct00025
Can be obtained by multiplying by The normal S'-point FFT is then sequenced to obtain S 'channel gain estimates for the subbands of interlace m.
Figure 112006035878562-pct00026
Is performed against.
Figure 112006035878562-pct00027
Derotation of h p (n) by
Figure 112006035878562-pct00028
The rotation of h (n) by can be combined so that the rotated channel gain values for interlace m
Figure 112006035878562-pct00029
(Where n = 1... S ').

An exemplary channel estimation scheme has been described above. Channel estimation may also be performed in other ways. For example, channel estimates obtained for the different interlaces used for pilot transmission may be filtered (eg, over time) and / or to make a more accurate channel estimate for each interlace of interest. Or post-processed (eg, based on the least squares estimate of the impulse response {h (n)}).

The multiplexing techniques described herein may be implemented by various means. For example, these techniques may be implemented by hardware, software, or a combination thereof. In a hardware implementation, the processing units used to perform multiplexing at the base station may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and programmable logic (PLDs). devices), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof. Can be. Processing units used to perform complementary processing in the wireless device may also be implemented by one or more ASICs, DSPs, and the like.

In a software implementation, multiplexing techniques may be implemented within modules (eg, procedures, functions, etc.) that perform the functions described herein. The software codes may be stored in a memory unit (eg, memory unit 142 or 182 of FIG. 1) and executed by a processor (eg, controller 140 or 180). The memory unit may be implemented within the processor or external to the processor. When the memory unit is implemented outside the processor, the memory unit may be communicatively connected to the processor through various means known in the art.

The previous description of the presented 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 apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention should not be limited to the embodiments set forth herein but should be construed in the broadest scope consistent with the principles and novel features set forth herein.

Claims (47)

  1. A method of transmitting data in a wireless multi-carrier communication system,
    Allocating slots into a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period;
    Multiplexing the data symbols in each data symbol stream into the slots assigned to the data symbol stream;
    Forming a plurality of non-overlapping interlaces using U frequency subbands usable for transmission, wherein U> 1, wherein each interlace is a frequency selected from among the U frequency subbands Is a different set of subbands;
    Mapping the plurality of slots to the plurality of interlaces in each symbol period; And
    Forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver; How to transfer.
  2. A method of transmitting data in a wireless multi-carrier communication system,
    Allocating slots into a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period;
    Multiplexing the data symbols in each data symbol stream into the slots assigned to the data symbol stream;
    Forming 2 N non-overlapping interlaces using a plurality of frequency subbands usable for transmission, where N &gt; 1, each interlace having a different set of frequency subbands selected from the plurality of frequency subbands Im-;
    Mapping the plurality of slots to the 2 N interlaces in each symbol period; And
    Forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver; How to transfer.
  3. The method of claim 2,
    N is 1, 2, 3 or 4, wherein the wireless multi-carrier communication system.
  4. The method of claim 1,
    Forming the plurality of non-overlapping interlaces,
    Forming a plurality of interlaces using an equal number of frequency subbands.
  5. The method of claim 1,
    Forming the plurality of non-overlapping interlaces,
    Forming a plurality of interlaces using frequency subbands in each interlace interlaced with frequency subbands in each of the remaining interlaces. .
  6. The method of claim 1,
    Forming the plurality of non-overlapping interlaces,
    Forming a plurality of frequency subband groups, each group comprising frequency subbands uniformly distributed across the T total frequency subbands in the system, wherein T &gt; And
    And forming respective interlaces using frequency subbands selected from each group of frequency subbands.
  7. The method of claim 1,
    Allocating the slots to the plurality of data symbol streams comprises:
    Allocating each of the plurality of interlaces as one data symbol stream in each symbol period.
  8. The method of claim 1,
    In the respective symbol period the plurality of slots are identified by slot indices, the method further comprising:
    During each symbol period, further comprising mapping the slot indices into the plurality of interlaces based on a slot-to-interlace mapping scheme. Method of transmitting data in a communication system.
  9. The method of claim 8,
    The step of mapping the slot indexes to the plurality of interlaces,
    Mapping each slot index used for data transmission to different ones of the plurality of interlaces in different symbol periods.
  10. The method of claim 1,
    And distributing data symbols multiplexed in each assigned slot to frequency subbands within the interlace to which the slot is mapped.
  11. The method of claim 10,
    Distributing the multiplexed data symbols to each allocated slot,
    Distributing data symbols for each data packet transmitted in the slot to frequency subbands in the interlace to which the slot is mapped.
  12. The method of claim 1,
    Selecting slots for pilot transmission among the plurality of slots in each symbol period; And
    And multiplexing pilot symbols into the slots used for pilot transmission.
  13. The method of claim 12,
    And mapping the slots used for pilot transmission to different interlaces in different symbol periods.
  14. The method of claim 12,
    Mapping the plurality of slots to the plurality of interlaces in each symbol period such that the interlaces used for pilot transmission have varying distances with respect to the interlaces used for data transmission. A method for transmitting data in a wireless multi-carrier communication system.
  15. The method of claim 8,
    Assigning at least one slot index for pilot transmission; And
    Allocating remaining slot indices for data transmission.
  16. The method of claim 15,
    Mapping the at least one slot index used for pilot transmission to at least one predetermined interlace; And
    Mapping each slot index used for data transmission to different interlaces in different symbol periods.
  17. The method of claim 1,
    Processing a plurality of data streams to obtain a plurality of data symbol streams, wherein one data symbol stream is for each data stream. How to transfer data.
  18. A method of transmitting data in a wireless multi-carrier communication system,
    Allocating slots into a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period;
    Multiplexing the data symbols in each data symbol stream into the slots assigned to the data symbol stream; And
    Forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver;
    Allocating the slots into a plurality of data symbol streams assigns a specific number of slots to each data symbol stream based on at least one coding and modulation scheme and at least one packet size used for the data symbol stream. And transmitting data in a wireless multi-carrier communication system.
  19. A method of transmitting data in a wireless multi-carrier communication system,
    Allocating slots into a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period;
    Multiplexing the data symbols in each data symbol stream into the slots assigned to the data symbol stream;
    Forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver; And
    Processing a plurality of data streams to obtain a plurality of data symbol streams, wherein processing the plurality of data streams, wherein one data symbol stream is for each data stream;
    Encoding data packets for each data stream according to one coding scheme to produce coded packets for the data stream; And
    Modulating the coded packets for each data stream in accordance with a modulation scheme to generate data symbols for a corresponding data symbol stream.
  20. The method of claim 19,
    Encoding data packets for each data stream includes encoding integer number of data packets for each data stream in each frame of a predetermined time period, and
    Allocating the slots to the plurality of data symbol streams includes allocating an integer number of slots to each data symbol stream in each frame based on the number of data packets transmitted in the frame for the corresponding data stream. A method for transmitting data in a wireless multi-carrier communication system comprising.
  21. A method of transmitting data in a wireless multi-carrier communication system,
    Allocating slots into a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period;
    Multiplexing the data symbols in each data symbol stream into the slots assigned to the data symbol stream; And
    Forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver;
    Allocating the slots to the plurality of data symbol streams includes assigning each data symbol stream a specific number of slots determined by the coding and modulation scheme and decoding constraints used for the data symbol stream. Transmitting data in a wireless multi-carrier communication system.
  22. An apparatus for transmitting data in a wireless multi-carrier communication system, the apparatus comprising:
    A controller operative to assign slots to a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period; And
    A data processor operative to multiplex the data symbols in each data symbol stream into the slots assigned to the data symbol stream and to form a composite symbol stream using the multiplexed data symbols for the plurality of data symbol streams; The plurality of data symbol streams is independently recoverable by a receiver;
    The controller is further operative to form a plurality of non-overlapping interlaces using the U frequency subbands available for transmission and to map the plurality of slots to the plurality of interlaces in each symbol period, U> 1, and wherein each interlace is a different set of frequency subbands selected from among the U frequency subbands.
  23. The method of claim 22,
    The plurality of slots in each symbol period are identified by slot indices, and the data processor maps the slot indices to the plurality of interlaces based on a slot-to-interlace mapping scheme during the respective symbol period. And operative to further transmit data in a wireless multi-carrier communication system.
  24. An apparatus for transmitting data in a wireless multi-carrier communication system, the apparatus comprising:
    A controller operative to assign slots to a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period; And
    A data processor operative to multiplex the data symbols in each data symbol stream into the slots assigned to the data symbol stream and to form a composite symbol stream using the multiplexed data symbols for the plurality of data symbol streams; The plurality of data symbol streams is independently recoverable by a receiver;
    The controller is further operative to select slots for pilot transmission among the plurality of slots in each symbol period,
    And the data processor is further operative to multiplex pilot symbols into the slots used for pilot transmission.
  25. An apparatus for transmitting data in a wireless multi-carrier communication system, the apparatus comprising:
    A controller operative to assign slots to a plurality of data symbol streams, each slot being a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period; And
    A data processor operative to multiplex the data symbols in each data symbol stream into the slots assigned to the data symbol stream and to form a composite symbol stream using the multiplexed data symbols for the plurality of data symbol streams; The plurality of data symbol streams is independently recoverable by a receiver;
    The controller is further operative to assign a specific number of slots to each data symbol stream based on at least one coding and modulation scheme and at least one packet size used for the data symbol stream. Device for transferring data in the.
  26. The method of claim 22,
    The data processor is further operative to process the plurality of data streams to obtain a plurality of data symbol streams, wherein one data symbol stream is for each data stream. Apparatus for transmitting data in a communication system.
  27. The method of claim 22,
    And said wireless multi-carrier communication system utilizes orthogonal frequency division multiplexing (OFDM).
  28. The method of claim 22,
    And the wireless multi-carrier communication system is a broadcast system.
  29. An apparatus for transmitting data in a wireless multi-carrier communication system, the apparatus comprising:
    Means for assigning slots to a plurality of data symbol streams, wherein each slot is a unit of transmission and the plurality of slots are frequency division multiplexed in each symbol period;
    Means for multiplexing data symbols in each data symbol stream into the slots assigned to the data symbol stream;
    Means for forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver;
    Means for forming a plurality of non-overlapping interlaces using U frequency subbands usable for transmission, wherein U> 1, wherein each interlace is different from a selected frequency subband of the U frequency subbands. Set-; And
    Means for mapping the plurality of slots to the plurality of interlaces in each symbol period.
  30. The method of claim 29,
    The plurality of slots in each symbol period are identified by slot indices, and the apparatus maps the slot indices to the plurality of interlaces based on a slot-to-interlace mapping scheme during the respective symbol period. And means for transmitting data in a wireless multi-carrier communication system.
  31. An apparatus for transmitting data in a wireless multi-carrier communication system, the apparatus comprising:
    Means for assigning slots to a plurality of data symbol streams, wherein each slot is a unit of transmission and the plurality of slots are frequency division multiplexed in each symbol period;
    Means for multiplexing data symbols in each data symbol stream into the slots assigned to the data symbol stream;
    Means for forming a composite symbol stream using multiplexed data symbols for the plurality of data symbol streams, the plurality of data symbol streams being independently recoverable by a receiver;
    Means for selecting slots for pilot transmission among the plurality of slots in each symbol period; And
    Means for multiplexing pilot symbols into the slots used for pilot transmission.
  32. The method of claim 29,
    Means for processing the plurality of data streams to obtain a plurality of data symbol streams, wherein one data symbol stream is for each data stream. Device for transferring data in the.
  33. A method of receiving data in a wireless multi-carrier communication system,
    Selecting at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system;
    Determining slots used for each selected data stream, wherein each slot is a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period, and a data symbol for each of the plurality of data streams Are multiplexed into slots assigned to the data stream, and the plurality of data streams are independently recoverable by a receiver;
    Mapping the plurality of slots into a plurality of non-overlapping interlaces formed using U frequency subbands available for transmission in each symbol period, wherein U> 1, wherein each interlace is the U frequencies A different set of frequency subbands selected from among subbands;
    Multiplexing the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream, wherein each detected data symbol is an estimate of the data symbol and at least one detected data symbol A stream is obtained for the at least one data stream selected for recovery; And
    Processing each detected data symbol stream to obtain a corresponding decoded data stream.
  34. The method of claim 33, wherein
    The plurality of slots in each symbol period are identified by slot indices, and the mapping of the plurality of slots in each symbol period is based on a slot-to-interlace mapping scheme. And mapping to the plurality of interlaces of a period.
  35. A method of receiving data in a wireless multi-carrier communication system,
    Selecting at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system;
    Determining slots used for each selected data stream, wherein each slot is a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period, and a data symbol for each of the plurality of data streams Are multiplexed into slots assigned to the data stream, and the plurality of data streams are independently recoverable by a receiver;
    Multiplexing the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream, wherein each detected data symbol is an estimate of the data symbol and at least one detected data symbol A stream is obtained for the at least one data stream selected for recovery;
    Processing each detected data symbol stream to obtain a corresponding decoded data stream;
    Performing a partial Fourier transform on each slot used for each selected data streams to obtain received data symbols for the slot, the partial Fourier transform being less than all frequency subbands in the system. Fourier transform for subbands-; And
    Performing detection on the received data symbols for each slot used for respective selected data streams to obtain detected symbols for the slot. How to receive.
  36. A method of receiving data in a wireless multi-carrier communication system,
    Selecting at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system;
    Determining slots used for each selected data stream, wherein each slot is a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period, and a data symbol for each of the plurality of data streams Are multiplexed into slots assigned to the data stream, and the plurality of data streams are independently recoverable by a receiver;
    Multiplexing the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream, wherein each detected data symbol is an estimate of the data symbol and at least one detected data symbol A stream is obtained for the at least one data stream selected for recovery;
    Processing each detected data symbol stream to obtain a corresponding decoded data stream; And
    Performing a partial Fourier transform for each slot used for pilot transmission to obtain a channel estimate for the slot.
  37. The method of claim 36,
    And further obtaining a channel estimate for each slot used for each selected data stream based on channel estimates obtained from the slots used for pilot transmission. A method of receiving data in a communication system.
  38. An apparatus for receiving data in a wireless multi-carrier communication system, the apparatus comprising:
    A controller operative to select at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system and to determine slots used for each selected data stream, wherein each slot is configured to Unit, a plurality of slots are frequency division multiplexed in each symbol period, data symbols for each of the plurality of data streams are multiplexed into slots assigned to the data stream, and the plurality of data streams are received by a receiver. Independently recoverable; And
    Multiplex the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream and process the respective detected data symbol stream to obtain a corresponding decoded data stream. A data processor, wherein each detected data symbol is an estimate of a data symbol and at least one detected data symbol stream is obtained for the at least one data stream selected for reconstruction;
    The controller is further operative to map the plurality of slots to a plurality of non-overlapping interlaces formed using U frequency subbands available for transmission in each symbol period,
    Wherein U> 1 and each interlace is a different set of frequency subbands selected from among the U frequency subbands.
  39. An apparatus for receiving data in a wireless multi-carrier communication system, the apparatus comprising:
    A controller operative to select at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system and to determine slots used for each selected data stream, wherein each slot is configured to Unit, a plurality of slots are frequency division multiplexed in each symbol period, data symbols for each of the plurality of data streams are multiplexed into slots assigned to the data stream, and the plurality of data streams are received by a receiver. Independently recoverable;
    Multiplex the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream and process the respective detected data symbol stream to obtain a corresponding decoded data stream. A data processor, wherein each detected data symbol is an estimate of a data symbol and at least one detected data symbol stream is obtained for the at least one data stream selected for reconstruction; And
    Perform a partial Fourier transform on each slot used for each selected data stream to obtain received data symbols for the slot, and each selected data stream to obtain detected symbols for the slot Apparatus for receiving data in a wireless multi-carrier communication system comprising a demodulator operative to perform detection on the received data symbols for each slot used for wireless communication.
  40. An apparatus for receiving data in a wireless multi-carrier communication system, the apparatus comprising:
    Means for selecting at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system;
    Means for determining slots used for each selected data stream, wherein each slot is a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period, and the data for each of the plurality of data streams Symbols are multiplexed into slots assigned to the data stream, and the plurality of data streams are independently recoverable by a receiver;
    Means for mapping the plurality of slots in a plurality of non-overlapping interlaces formed using U frequency subbands usable for transmission in each symbol period, wherein U> 1, wherein each interlace is A different set of frequency subbands selected from among frequency subbands;
    Means for multiplexing the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream, wherein each detected data symbol is an estimate of the data symbol and at least one detected data. A symbol stream is obtained for the at least one data stream selected for reconstruction; And
    Means for processing the respective detected data symbol streams to obtain a corresponding decoded data stream.
  41. An apparatus for receiving data in a wireless multi-carrier communication system, the apparatus comprising:
    Means for selecting at least one data stream for reconstruction from among a plurality of data streams transmitted by a transmitter in the system;
    Means for determining slots used for each selected data stream, wherein each slot is a unit of transmission, the plurality of slots being frequency division multiplexed in each symbol period, and the data for each of the plurality of data streams Symbols are multiplexed into slots assigned to the data stream, and the plurality of data streams are independently recoverable by a receiver;
    Means for performing partial Fourier transform on each slot used for each selected data streams to obtain received data symbols for the slot;
    Means for performing detection on the received data symbols for each slot used for respective selected data streams to obtain detected symbols for the slot;
    Means for multiplexing the detected data symbols obtained for the slots used for each selected data stream into the detected data symbol stream, wherein each detected data symbol is an estimate of the data symbol and at least one detected data. A symbol stream is obtained for the at least one data stream selected for reconstruction; And
    Means for processing the respective detected data symbol streams to obtain a corresponding decoded data stream.
  42. delete
  43. delete
  44. delete
  45. delete
  46. delete
  47. delete
KR1020067009990A 2003-09-02 2004-10-21 Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system KR100944821B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US51431503P true 2003-10-24 2003-10-24
US60/514,315 2003-10-24
US55974004P true 2004-04-05 2004-04-05
US60/559,740 2004-04-05
US10/932,586 US7221680B2 (en) 2003-09-02 2004-09-01 Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
US10/932,586 2004-09-01

Publications (2)

Publication Number Publication Date
KR20060086439A KR20060086439A (en) 2006-07-31
KR100944821B1 true KR100944821B1 (en) 2010-03-03

Family

ID=34527959

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020067009990A KR100944821B1 (en) 2003-09-02 2004-10-21 Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system

Country Status (7)

Country Link
EP (1) EP1678906A1 (en)
JP (1) JP2007509586A (en)
KR (1) KR100944821B1 (en)
AU (1) AU2004307449C1 (en)
BR (1) BRPI0415840A (en)
CA (1) CA2543771C (en)
WO (1) WO2005041515A1 (en)

Families Citing this family (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8194770B2 (en) 2002-08-27 2012-06-05 Qualcomm Incorporated Coded MIMO systems with selective channel inversion applied per eigenmode
US8208364B2 (en) 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US7002900B2 (en) 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
US8570988B2 (en) 2002-10-25 2013-10-29 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8320301B2 (en) 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US20040081131A1 (en) 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
US8169944B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US8170513B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
US8218609B2 (en) 2002-10-25 2012-07-10 Qualcomm Incorporated Closed-loop rate control for a multi-channel communication system
US7324429B2 (en) 2002-10-25 2008-01-29 Qualcomm, Incorporated Multi-mode terminal in a wireless MIMO system
US8509051B2 (en) 2003-09-02 2013-08-13 Qualcomm Incorporated Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
US7221680B2 (en) 2003-09-02 2007-05-22 Qualcomm Incorporated Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
US8599764B2 (en) 2003-09-02 2013-12-03 Qualcomm Incorporated Transmission of overhead information for reception of multiple data streams
US8477809B2 (en) 2003-09-02 2013-07-02 Qualcomm Incorporated Systems and methods for generalized slot-to-interlace mapping
US8526412B2 (en) 2003-10-24 2013-09-03 Qualcomm Incorporated Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system
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
TW200623754A (en) * 2004-05-18 2006-07-01 Qualcomm Inc Slot-to-interlace and interlace-to-slot converters for an ofdm system
US7292856B2 (en) 2004-12-22 2007-11-06 Qualcomm Incorporated Methods and apparatus for flexible forward-link and reverse-link handoffs
US7555074B2 (en) * 2005-02-01 2009-06-30 Telefonaktiebolaget L M Ericsson (Publ) Interference estimation in the presence of frequency errors
US8135088B2 (en) * 2005-03-07 2012-03-13 Q1UALCOMM Incorporated Pilot transmission and channel estimation for a communication system utilizing frequency division multiplexing
US8693540B2 (en) 2005-03-10 2014-04-08 Qualcomm Incorporated Method and apparatus of temporal error concealment for P-frame
US7653860B2 (en) * 2005-03-10 2010-01-26 Qualcomm Incorporated Transmit driver data communication
US7742444B2 (en) 2005-03-15 2010-06-22 Qualcomm Incorporated Multiple other sector information combining for power control in a wireless communication system
US8170047B2 (en) * 2005-05-09 2012-05-01 Qualcomm Incorporated Data transmission with efficient slot and block formats in a wireless communication system
US7466749B2 (en) 2005-05-12 2008-12-16 Qualcomm Incorporated Rate selection with margin sharing
JP4612467B2 (en) * 2005-05-18 2011-01-12 パナソニック株式会社 Base station apparatus, mobile station apparatus, and cell search method
US8254360B2 (en) * 2005-06-16 2012-08-28 Qualcomm Incorporated OFDMA control channel interlacing
US8358714B2 (en) 2005-06-16 2013-01-22 Qualcomm Incorporated Coding and modulation for multiple data streams in a communication system
US8750908B2 (en) 2005-06-16 2014-06-10 Qualcomm Incorporated Quick paging channel with reduced probability of missed page
US8730877B2 (en) * 2005-06-16 2014-05-20 Qualcomm Incorporated Pilot and data transmission in a quasi-orthogonal single-carrier frequency division multiple access system
US9055552B2 (en) 2005-06-16 2015-06-09 Qualcomm Incorporated Quick paging channel with reduced probability of missed page
US7983674B2 (en) 2005-06-16 2011-07-19 Qualcomm Incorporated Serving base station selection in a wireless communication system
JP4885957B2 (en) * 2005-07-27 2012-02-29 クゥアルコム・インコーポレイテッドQualcomm Incorporated System and method for FORWARDLINKONLY message
US7903628B2 (en) * 2005-08-22 2011-03-08 Qualcomm Incorporated Configurable pilots in a wireless communication system
WO2007024091A2 (en) * 2005-08-23 2007-03-01 Electronics And Telecommunications Research Institute Transmitter in fdma communication system and method for configuring pilot channel
US20070147226A1 (en) * 2005-10-27 2007-06-28 Aamod Khandekar Method and apparatus for achieving flexible bandwidth using variable guard bands
WO2007050904A2 (en) 2005-10-27 2007-05-03 Qualcomm Incorporated A method and apparatus for single input single output (siso) transmission in wireless communication system
US20090207790A1 (en) 2005-10-27 2009-08-20 Qualcomm Incorporated Method and apparatus for settingtuneawaystatus in an open state in wireless communication system
WO2007050952A1 (en) 2005-10-27 2007-05-03 Qualcomm Incorporated A method and apparatus for determining probe sequence backoff time value in wireless communication systems
JP4451400B2 (en) 2006-01-18 2010-04-14 株式会社エヌ・ティ・ティ・ドコモ Transmitting apparatus and transmitting method
WO2007091874A1 (en) * 2006-02-11 2007-08-16 Samsung Electronics Co., Ltd. Procede et systeme d'attribution de ressources de transmission et d'indication des ressources de transmission attribuees pour une diversite de frequence
EP2033393B1 (en) 2006-06-14 2014-01-22 Agere Systems Inc. Orthogonal frequency division multiplexing using subsymbol processing
KR100959333B1 (en) 2006-09-29 2010-05-20 삼성전자주식회사 Apparatus for bidirectional communication using auxiliary band in wireless communication system
MX2009004605A (en) 2006-11-01 2009-05-15 Qualcomm Inc Multiplexing of control and data with varying power offsets in a sc-fdma system.
US20080225792A1 (en) * 2007-03-12 2008-09-18 Qualcomm Incorporated Multiplexing of feedback channels in a wireless communication system
US8345610B2 (en) 2007-06-18 2013-01-01 Alcatel Lucent Method and apparatus for mapping pilot signals in multiplexing mode of unicast and broadcast/multicast services
BRPI0813728A2 (en) 2007-06-22 2015-09-29 Panasonic Corp transmitting device, receiving device and ofdm transmission method
US20090175210A1 (en) * 2007-07-26 2009-07-09 Qualcomm Incorporated Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
CA2694629C (en) 2007-08-02 2014-08-26 Fujitsu Limited Pilot arrangement method in mobile radio communication system and transmitter/receiver adopting same
CN103338099B (en) * 2007-08-02 2016-06-29 富士通株式会社 Communication means in mobile communication system and mobile communication system
US9078269B2 (en) 2007-09-21 2015-07-07 Qualcomm Incorporated Interference management utilizing HARQ interlaces
US9137806B2 (en) 2007-09-21 2015-09-15 Qualcomm Incorporated Interference management employing fractional time reuse
US9066306B2 (en) 2007-09-21 2015-06-23 Qualcomm Incorporated Interference management utilizing power control
US8824979B2 (en) 2007-09-21 2014-09-02 Qualcomm Incorporated Interference management employing fractional frequency reuse
US9374791B2 (en) 2007-09-21 2016-06-21 Qualcomm Incorporated Interference management utilizing power and attenuation profiles
US8867456B2 (en) 2007-11-27 2014-10-21 Qualcomm Incorporated Interface management in wireless communication system using hybrid time reuse
US8948095B2 (en) 2007-11-27 2015-02-03 Qualcomm Incorporated Interference management in a wireless communication system using frequency selective transmission
GB0810962D0 (en) 2008-06-04 2008-07-23 Sony Uk Ltd Digital signal reception
ES2431337T3 (en) 2008-06-04 2013-11-26 Sony Corporation New frame structure for multiple carrier systems
US8375261B2 (en) 2008-07-07 2013-02-12 Qualcomm Incorporated System and method of puncturing pulses in a receiver or transmitter
US20100214938A1 (en) * 2009-02-24 2010-08-26 Qualcomm Incorporated Flexible data and control multiplexing
US9002315B2 (en) 2009-05-01 2015-04-07 Qualcomm Incorporated Systems, apparatus and methods for facilitating emergency call service in wireless communication systems
JP5198367B2 (en) * 2009-06-18 2013-05-15 株式会社エヌ・ティ・ティ・ドコモ Transmission device, transmission method, user device, and communication method
US9077444B2 (en) 2013-09-12 2015-07-07 Motorola Solutions, Inc. Method and apparatus for late entry in asynchronous frequency hopping systems using random permutation sequences
CN103647737B (en) * 2013-12-20 2016-09-21 东南大学 The time hopping modulation implementation method of MPPSK modulation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002049306A2 (en) * 2000-12-15 2002-06-20 Broadstorm Telecommunications, Inc. Multi-carrier communications with group-based subcarrier allocation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721461B1 (en) * 1994-06-16 1996-09-06 France Telecom Signal formed of a plurality of orthogonal carrier frequencies organized to simplify receiving a source signal component, transmission method and corresponding receiver.
JPH1066039A (en) * 1996-08-23 1998-03-06 Sony Corp Communication method, transmitter, transmission method, receiver and reception method
US20020154705A1 (en) * 2000-03-22 2002-10-24 Walton Jay R. High efficiency high performance communications system employing multi-carrier modulation
US7224741B1 (en) * 2000-07-24 2007-05-29 Zion Hadad System and method for cellular communications
US6424678B1 (en) * 2000-08-01 2002-07-23 Motorola, Inc. Scalable pattern methodology for multi-carrier communication systems
JP2002111631A (en) * 2000-10-04 2002-04-12 Yrp Mobile Telecommunications Key Tech Res Lab Co Ltd System and apparatus for radio communication
ES2186531B1 (en) * 2001-04-19 2005-03-16 Diseño De Sistemas En Silicio, S.A. Procedure for multiple and multiple data transmission for a multi-user digital data transmission system point to multipoint on electrical network.
US6801580B2 (en) * 2002-04-09 2004-10-05 Qualcomm, Incorporated Ordered successive interference cancellation receiver processing for multipath channels

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002049306A2 (en) * 2000-12-15 2002-06-20 Broadstorm Telecommunications, Inc. Multi-carrier communications with group-based subcarrier allocation

Also Published As

Publication number Publication date
CA2543771A1 (en) 2005-05-06
EP1678906A1 (en) 2006-07-12
CA2543771C (en) 2010-04-20
WO2005041515A1 (en) 2005-05-06
AU2004307449B2 (en) 2008-11-20
KR20060086439A (en) 2006-07-31
AU2004307449A1 (en) 2005-05-06
BRPI0415840A (en) 2007-01-02
AU2004307449C1 (en) 2009-04-30
JP2007509586A (en) 2007-04-12

Similar Documents

Publication Publication Date Title
JP4739952B2 (en) Transmit diversity processing for multi-antenna communication systems
JP5269856B2 (en) Coding and modulation for broadcast and multicast services in wireless communication systems
KR101088189B1 (en) Methods and apparatus for configuring a pilot symbol in a wireless communication system
RU2390935C2 (en) Variable-characteristic signalling channels for return communication line in wireless communication system
CN1894876B (en) Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
CN101019397B (en) Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system
EP1909448A2 (en) Apparatus for Transmitting and Receiving Data to Provide High-Speed Data Communication and Method Thereof
US6188717B1 (en) Method of simultaneous radio transmission of digital data between a plurality of subscriber stations and a base station
KR101368506B1 (en) New frame and signalling pattern structure for multi-carrier systems
KR101149226B1 (en) Method and apparatus for sending signaling for data transmission in a wireless communication system
EP1032153A2 (en) Encoding of data for transmission over channels with impulsive noise
US8509051B2 (en) Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
EP1265411A1 (en) Multicarrier system with adaptive bit-wise interleaving
CN1875596B (en) Apparatus and method for assigning subchannels in an OFDMA communication system
JP5059865B2 (en) Method and apparatus for transmitting a frame structure in a wireless communication system
US7535860B2 (en) Apparatus and method for transmitting/receiving pilot signal in communication system using OFDM scheme
KR20100040265A (en) New frame and data pattern structure for multi-carrier systems
KR20090034675A (en) Method and apparatus for interleaving data in mobile telecommunication system
US7746758B2 (en) Orthogonal-Frequency-Division-Multiplex-Packet-Aggregation (OFDM-PA) for wireless network systems using error-correcting codes
EP1973262B1 (en) Method for mapping physical downlink control channel to resources and apparatus for transmitting/receiving the mapped physical downlink control in a wireless communication system
JP5491225B2 (en) New frame and data pattern structure for multi-carrier systems
CA2583272C (en) Apparatus and method for transmitting/receiving packet data symbol in a mobile communication system
KR20080089383A (en) Hierarchical coding for multicast messages
EP1308011A1 (en) Channel decoding apparatus and method in an orthogonal frequency division multiplexing system
EP2220806B1 (en) Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E90F Notification of reason for final refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130130

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20140129

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20150129

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20151230

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20161229

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20171228

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20190107

Year of fee payment: 10