USRE45498E1 - Apparatus and method for signal constitution for downlink of OFDMA-based cellular system - Google Patents

Apparatus and method for signal constitution for downlink of OFDMA-based cellular system Download PDF

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USRE45498E1
USRE45498E1 US12/959,154 US95915410A USRE45498E US RE45498 E1 USRE45498 E1 US RE45498E1 US 95915410 A US95915410 A US 95915410A US RE45498 E USRE45498 E US RE45498E
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traffic channel
user
pilot symbols
transmission mode
symbols
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Sok-Kyu Lee
Kwang-Soon Kim
Kyung-Hi Chang
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Electronics and Telecommunications Research Institute ETRI
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0085—Timing of allocation when channel conditions change
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H04L5/0046—Determination of the number of bits transmitted on different sub-channels

Definitions

  • the present invention relates to an apparatus and method for signal constitution for a downlink of an OFDMA (Orthogonal Frequency Division Multiplexing Access) based cellular system. More specifically, the present invention relates to an apparatus and method for adaptive pilot symbol assignment and sub-carrier allocation that reduces transmission power consumption and overhead caused by pilot symbols and increases the total data rate on the downlink of an OFDMA-based cellular system.
  • OFDMA Orthogonal Frequency Division Multiplexing Access
  • pilot symbols of the multiple antennas are assigned in consideration of both the time domain and the frequency domain.
  • the distance between pilot symbols must be quite small in designing pilot symbols in the worst environment, or when using non-optimal channel estimation filters having a lower complexity.
  • ⁇ max is the maximum exceedance delay time of a channel.
  • the maximum pilot distance N T in the frequency domain is determined by the following formula:
  • the symbol time T S during which the maximum pilot distance is proportional to the coherent time, is normalized by the number of symbols. So, the maximum pilot distance in the time domain is proportional to the coherent bandwidth and normalized by the sub-carrier bandwidth.
  • the balanced design (P. Hoeher et al., “Pilot-symbol-aided channel estimation in time and frequency”, Multi-carrier Spread-Spectrum, accepted for publication in Kluwer Academic Publishers, 1997) defines that the estimation uncertainty in the time domain is equal to that in the frequency domain.
  • P. Hoeher et al. suggest a design guide having two-fold oversampling as defined by a heuristic formula as follows: 2f D T S ⁇ N T ⁇ max f sc ⁇ N F ⁇ 1 ⁇ 2 [Formula 3] where N F is the pilot distance in the frequency domain.
  • the above-mentioned pilot symbol assignment is primarily a rectangular pilot symbol assignment, which is illustrated in FIG. 1 .
  • pilot symbol assignment 2 and 3 show a straight pilot symbol assignment and a hexagonal pilot symbol assignment, respectively.
  • hexagonal pilot symbol assignment allows more efficient sampling, compared with two-dimensional signals, and exhibits excellent performance relative to other assignments.
  • An example of the pilot symbol assignment is disclosed in “Efficient pilot patterns for channel estimation in OFDM systems over HF channels” (M. J. Fernandez-Getino Garcia et al., in Proc IEEE VTC1999).
  • the channel estimation performance becomes more excellent but the data rate is decreased.
  • a trade-off lies between the data rate and the channel estimation performance (i.e., pilot symbol distance).
  • pilot symbol distance that optimizes the trade-off between the improved channel estimation and the signal-to-noise ratio (SNR) reduced by data symbols.
  • SNR signal-to-noise ratio
  • N F and N T the values approximate to the optimum with reference to the performance of bit error rate (BER) can be determined.
  • BER bit error rate
  • a downlink signal constitution method which is for a downlink of a cellular system using an orthogonal frequency division multiplexing access method, the downlink signal constitution method including: (a) coding, interleaving, and symbol-mapping data of a common channel and a control channel, and assigning fundamental pilot symbols, necessary for a demodulation of the common channel and the control channel, to time, frequency, and antenna; (b) receiving data to be transmitted through a traffic channel of each user, and determining a transmission mode of each user according to the user's moving speed, channel information, and traffic requirement; (c) determining additional pilot symbols, additionally necessary for a demodulation of the traffic channel, according to the transmission mode and moving speed by users; and (d) coding, interleaving and symbol-mapping the data of the traffic channel according to the transmission mode by users, and assigning the mapped symbols and the additional pilot symbols according to time, frequency and antenna.
  • a downlink signal constitution method which is for a cellular system using an orthogonal frequency division multiplexing access method, the downlink signal constitution method including: (a) dividing users into a first user group including high-speed mobile users and a second user group including the rest of the users, in consideration of each user's moving speed and traffic volume; (b) allocating a first sub-carrier band for the first user group, and a second sub-carrier band for the second user group; and (c) assigning pilot symbols to the first and second sub-carrier bands, the pilot symbols assigned to the first sub-carrier band being different in assignment density from the pilot symbols assigned to the second sub-carrier.
  • a downlink signal constitution apparatus which is for a cellular system using an orthogonal frequency division multiplexing access method, the downlink signal constitution apparatus including: a first memory for storing traffic channel information of each user; a second memory for storing channel information, traffic requirement, and moving speed information of each user; a transmission user and transmission mode determiner for determining a transmission user and a transmission mode according to a defined method using the information stored in the second memory; a traffic channel processor for reading the traffic channel information stored in the first memory according to the transmission mode determined by the transmission user and transmission mode determiner, and performing coding, interleaving, and symbol-mapping of the traffic channel; an additional pilot symbol generator for generating additional pilot symbols necessary for a demodulation of the traffic channel, using the transmission mode determined by the transmission user and transmission mode determiner and the moving speed information stored in the second memory; and a time/sub-carrier/antenna mapper for multiplying the traffic channel symbols output from the traffic channel processor and the additional pilot
  • a recording medium with a built-in program which implements a downlink signal constitution method for a cellular system using an orthogonal frequency division multiplexing access method, the program including: a function of coding, interleaving, and symbol-mapping data of a common channel and a control channel, and assigning fundamental pilot symbols, necessary for a demodulation of the common channel and the control channel, to time, frequency, and antenna; a function of receiving data to be transmitted through a traffic channel of each user, and determining a transmission mode of each user according to the user's moving speed, channel information, and traffic requirement; a function of determining additional pilot symbols, additionally necessary for a demodulation of the traffic channel, according to the transmission mode and moving speed by users; and a function of coding, interleaving and symbol-mapping the data of the traffic channel according to the transmission mode by users, and assigning the mapped symbols and the additional pilot symbols according to time, frequency, and antenna.
  • a recording medium with a built-in program which implements a downlink signal constitution method for a cellular system using an orthogonal frequency division multiplexing access method, the program including: a function of dividing users into a first user group including high-speed mobile users and a second user group including the rest of the users, in consideration of each user's moving speed and traffic volume; a function of allocating a first sub-carrier band for the first user group, and a second sub-carrier band for the second user group; and a function of assigning pilot symbols to the first and second sub-carrier bands, the pilot symbols assigned to the first sub-carrier band being different in assignment density from the pilot symbols assigned to the second sub-carrier.
  • FIG. 1 is an exemplary diagram of a rectangular pilot symbol assignment
  • FIG. 2 is an exemplary diagram of a straight pilot symbol assignment
  • FIG. 3 is an exemplary diagram of a hexagonal pilot symbol assignment
  • FIG. 4 is a flow chart showing a symbol assignment method for a downlink of an OFDMA-based cellular system according to an embodiment of the present invention
  • FIG. 5 is a detailed diagram showing a symbol assignment method for the traffic channel of FIG. 4 ;
  • FIG. 6 is a diagram showing a downlink signal constitution method according to the embodiment of the present invention.
  • FIG. 7 is an exemplary diagram of a pilot symbol assignment for low-speed mobile users using four antennas
  • FIG. 8 is an exemplary diagram of a pilot symbol assignment for high-speed mobile users using two antennas
  • FIG. 9 is an exemplary diagram showing a downlink signal constitution method when using additional antennas only in a part of the whole band in an FDD system
  • FIG. 10 is a diagram of a downlink signal constitution apparatus for an OFDMA-based cellular system according to the embodiment of the present invention.
  • FIG. 11 is a detailed flow chart showing a pilot symbol assignment according to sub-carrier allocation.
  • FIG. 12 is an exemplary diagram showing a pilot symbol assignment according to a sub-carrier allocation for high-speed mobile users and a moving speed.
  • FIG. 4 is a diagram showing a downlink symbol assignment method for an OFDMA-based cellular system according to an embodiment of the present invention.
  • the symbol assignment method according to the embodiment of the present invention comprises, as shown in FIG. 4 , a symbol assignment step S 100 for common/control channels, a symbol assignment step S 200 for traffic channels, and a traffic channel signal constitution step S 300 .
  • the symbol assignment step S 100 for common/control channels performs coding, interleaving, and symbol mapping on data of common and control channels, and assigns the mapped symbols to time, frequency, and antennas. Also, fundamental pilot symbols necessary for demodulation of the common and control channels are assigned to time, frequency, and antennas.
  • the symbol assignment step S 200 for traffic channels receives data to be transferred through the traffic channel of each user; determines each user's transmission mode according to the user's moving speed, channel information, and traffic requirement; performs coding, interleaving, and symbol-mapping according to the transmission mode of the user; and assigns the traffic channel symbols of each user to time, frequency, and antennas. Also, pilot symbols additionally necessary for a demodulation of the traffic channel are generated according to the transmission mode by users, and assigned to time, frequency, and antennas.
  • the traffic channel signal constitution step S 300 constitutes the signal of the traffic channel using the traffic channel symbols of each user and the additional pilot symbols output from the step S 200 .
  • FIG. 5 is a detailed diagram of the symbol assignment S 200 for traffic channels shown in FIG. 4 .
  • the transmitter antennas are divided into basic antennas and additional antennas.
  • the basic antenna refers to an antenna used for transmitting common and control channels
  • the additional antenna refers to an antenna additionally used to enhance the transmission rate or performance of the traffic channel of the user.
  • one frequency band is divided into a plurality of sub-carrier bands to transmit the traffic channel of each user through the allocated sub-carriers.
  • the OFDMA system properly allocates a sub-carrier band according to the user's moving speed, channel environment, and traffic requirement, or selects a defined sub-carrier band, determines the number of transmitter antennas according to the user's moving speed, channel environment, and traffic requirement, and then assigns additionally necessary pilot symbols to the allocated sub-carrier band.
  • the OFDMA system stores data to be transmitted through a traffic channel, in step S 210 .
  • the transmission mode and the number of additional antennas are determined in consideration of the user's channel information (i.e., channel status), traffic requirement, and moving speed, in step S 220 .
  • step S 230 the system assigns pilot symbols for additional antennas, when the additional antennas are needed according to the transmission mode determined in the step S 220 .
  • the additional pilot symbols according to the moving speed of the basic antennas and the additional antennas are then assigned in consideration of the user's moving speed, in step S 240 .
  • the system performs coding, interleaving, and symbol mapping using the transmission mode determined in the step S 220 and the traffic channel data stored in the step S 210 to generate coded, interleaved, and symbol-mapped traffic channel symbols, in step S 250 .
  • the transmission mode for each user is determined independently, or the transmission mode for multiple users is determined by optimization in consideration of the total transmission rate, the quality of service, or the total transmission power.
  • FIG. 6 is an exemplary diagram showing a downlink signal constitution method according to the embodiment of the present invention.
  • the pilot symbols are assigned to the sub-carrier band, which is allocated to a user 1 moving at high speed with one basic antenna, a user 2 moving at low speed with one additional antenna, a user 3 moving at low speed with three additional antennas, and a user 4 moving at high speed with one additional antenna.
  • FIG. 6 shows the case where a demodulation can be enabled with one pilot symbol in one slot in the time domain because the moving speed is low.
  • the common and control channels are used to transmit OFDM symbols such as pilot symbols of the basic antenna, and demodulate them irrespective of the moving speed of the users.
  • the traffic channel is used to transmit the additional pilot symbols necessary according to the moving speed of the users and the number of antennas in the allocated sub-carrier band by users.
  • FIG. 7 is an exemplary diagram showing a pilot symbol assignment in the sub-carrier band allocated to a low-speed mobile user using one basic antenna and three additional antennas according to the embodiment of the present invention.
  • the pilot symbols of the additional antennas (antenna 1 , antenna 2 , antenna 3 ) are additionally transmitted.
  • the symbols of the traffic channel can be generated by any one of the following methods: (1) a first method of generating traffic channel symbols previously in consideration of the number of additional pilots; (2) a second method of generating the maximum number of traffic channel symbols and then puncturing at positions to transmit additional pilot symbols; and (3) a third method of generating traffic channel symbols previously in consideration of the number of a part of additional pilot symbols, and then puncturing at positions to transmit the rest of the additional pilot symbols.
  • FIG. 8 is an exemplary diagram showing a pilot symbol assignment in the sub-carrier band allocated to a high-speed mobile user using one basic antenna and one additional antenna according to the embodiment of the present invention.
  • the pilot symbols of the additional antenna (antenna 1 ) are additionally transmitted.
  • the symbols of the traffic channel can be generated by one of the following methods: (1) a first method of generating traffic channel symbols previously in consideration of the number of additional pilots; (2) a second method of generating the maximum number of traffic channel symbols and then puncturing at positions to transmit additional pilot symbols; and (3) a third method of generating traffic channel symbols previously in consideration of the number of a part of additional pilot symbols, and then puncturing at positions to transmit the rest of the additional pilot symbols.
  • the base station must have information about the channel information, moving speed, and traffic requirement of each user.
  • the moving speed is measured at the base station, or is measured at the mobile station and then reported to the base station.
  • the traffic requirement is reported to the base station by the mobile station, or is detected by the base station from the amount or characteristic of data to be transmitted.
  • the channel information is measured at the base station, or is measured at the mobile station and then reported to the base station.
  • the former case is primarily for the TDD (Time Division Duplex) based system, and the latter one is for the FDD (Frequency Division Duplex) based system.
  • the mobile station sends a signal (e.g., preamble, pilot, etc.) for channel measurement, and then the base station measures the channel information of the uplink by the respective antennas based on the received signal.
  • the base station acquires channel information of the downlink using the reciprocity of channels because the uplink and the downlink have the same channel information because they use the same frequency band.
  • the mobile station previously sends pilots of additional antennas so as to perform a channel estimation of the additional antennas.
  • FIG. 9 is an exemplary diagram showing a downlink signal constitution method when using additional antennas only in a defined band in the FDD system.
  • FIG. 9 shows the addition of an appropriate quantity of pilot symbols for additional antennas to the first symbol only in a defined band so as to reduce overhead caused by transmitting pilots of additional antennas.
  • one basic antenna (antenna 1 ) is used, and the third band is a band available for using at most three additional antennas, the fourth band being a band available for using at most one additional antenna, the other bands not being available for using additional antennas.
  • FIG. 10 is a diagram of a downlink signal constitution apparatus 100 for an OFDMA-based cellular system according to the embodiment of the present invention.
  • the downlink signal constitution apparatus 100 comprises a common/control channel processor 110 , a fundamental pilot symbol generator 120 , a traffic channel information memory 130 , a traffic channel processor 140 , a channel information/traffic requirement/moving speed memory 150 , a transmission user and transmission mode determiner 160 , an additional pilot symbol generator 170 , and a time/sub-carrier/antenna mapper 180 .
  • the common/control channel processor 110 encodes and interleaves the common/control channel information, and maps the coded and interleaved common/control channel information to symbols to generate a coded/interleaved/symbol-mapped common/control channel symbol.
  • the fundamental pilot symbol generator 120 generates a fundamental pilot symbol.
  • the fundamental pilot symbol is a pilot symbol transmitted irrespective of the transmission mode of the traffic channel of the user, and in FIGS. 6 and 9 , refers to a pilot symbol transmitted for the first OFDM symbol of the slot.
  • the traffic channel information memory 130 stores the user's traffic channel information
  • the channel information/traffic requirement/moving speed memory 150 stores the user's channel information, traffic requirement, and moving speed information.
  • the transmission user and transmission mode determiner 160 determines the transmission user and each transmission mode according to a defined method using the information stored in the channel information/traffic requirement/moving speed memory 150 .
  • the traffic channel processor 140 reads the traffic channel information stored in the traffic channel information memory 130 according to the transmission mode determined by the transmission user and transmission mode determiner 160 , encodes and interleaves the traffic channel information, and maps the coded and interleaved traffic channel information to generate a coded/interleaved/symbol-mapped traffic channel symbol.
  • the additional pilot symbol generator 170 generates an additional pilot symbol according to the number of antennas and the moving speed determined by each user's transmission mode.
  • the additional pilot symbol is a pilot symbol additionally transmitted other than the fundamental pilot symbol for the respective users, and in FIGS. 6 and 9 , refers to the pilot symbols other than the pilot symbol transmitted for the first OFDM symbol of the slot.
  • the time/sub-carrier/antenna mapper 180 multiplies the coded/interleaved/symbol-mapped common/control channel symbol generated from the common/control channel processor 110 , the coded/interleaved/symbol-mapped traffic channel symbol generated from the traffic channel processor 130 , the fundamental pilot symbol generated from the fundamental pilot symbol generator 120 , and the additional pilot symbol generated from the additional pilot symbol generator 170 by channel gain information by channels or users, and maps the channel symbols to time, sub-carrier, and antenna by a defined method.
  • the time/sub-carrier/antenna mapper 180 can use any one of the following methods: (1) a first method of generating traffic channel symbols previously in consideration of the number of additional pilots; (2) a second method of generating the maximum number of traffic channel symbols and then puncturing at positions to transmit additional pilot symbols; and (3) a third method of generating traffic channel symbols previously in consideration of the number of a part of additional pilot symbols, and then puncturing at positions to transmit the rest of the additional pilot symbols.
  • the output of the downlink signal constitution apparatus 100 is OFDM-modulated through OFDM modulators 200 a, 200 b, . . . , and 200 n, and is subjected to D/A conversion, frequency up-conversion, filtering, and amplification through radio transmitters 300 a, 300 b, . . . , and 300 n, and transmitted via antennas 400 a, 400 b, . . . , and 400 n.
  • FIG. 11 is a detailed flow chart of a pilot symbol assignment method according to sub-carrier allocation in the embodiment of the present invention.
  • some of the sub-carriers are allocated according to the traffic requirement and the moving speed by an appropriate method in the downlink of the OFDMA-based cellular system, and then the pilot symbols of the traffic channel of the corresponding sub-carrier are properly assigned by the pilot symbol assignment method according to the moving speed, or the like.
  • step S 410 data to be transmitted through a traffic channel are stored, in step S 410 , and it is determined in step S 420 whether the moving speed is high or low.
  • step S 420 If the moving speed is determined as low in the step S 420 , then the sub-carriers are allocated according to channel status, traffic requirement, and low-speed determination information, in step S 430 , and pilot symbols for low speed are assigned to the allocated sub-carriers, in step S 450 .
  • step S 420 If the moving speed is determined as high in the step S 420 , then the sub-carriers are allocated according to channel status, traffic requirement, and high-speed determination information, in step S 440 , and pilot symbols for high speed are assigned to the allocated sub-carriers, in step S 460 .
  • the pilot symbols assigned in the steps S 450 and S 460 are output to a data symbol assignment input.
  • FIG. 12 is an exemplary diagram of sub-carrier allocation according to the moving speed of the user, and pilot symbol assignment of the corresponding sub-carrier.
  • sub-carrier allocation is achieved by users or data types.
  • the sub-carriers are allocated according to each user's moving speed.
  • the pilot symbols are assigned very densely with a small pilot symbol distance, and the number of data symbols to be transmitted is reduced with a deterioration of the data rate.
  • the pilot symbols are much more densely assigned than needed, with a deterioration of efficiency.
  • the users can be divided into a user group having a moving speed of 250 km/h and a user group having a moving speed of less than 120 km/h, based on the fact that there is no speed to be considered between 120 and 250 km/h.
  • the high-speed mobile users are the users of an express train running at a speed of 250 km/h and the proportion of users in service is less than 0.1% of all users all over the country
  • only some of all the sub-carriers can be allocated to the high-speed mobile users.
  • the sub-carriers allocated must assign proper pilot symbols to the high-speed mobile users.
  • the rest of the sub-carriers are allocated to mobile users having a speed of less than 120 km/h, and proper pilot symbols are assigned to the users.
  • the pilot symbols of the sub-carriers for the high-speed mobile users are inserted more densely than those of the rest of the sub-carriers, thus enhancing the data rate of the whole system.
  • the present invention determines the number of transmit antennas according to each user's moving speed, channel status, or user request, and properly assigns pilot symbols in the downlink of an OFDMA-based cellular system, thereby reducing a transmission power consumption and an overhead caused by pilots.
  • the present invention allocates some sub-carriers to assign proper pilot symbols for ultrahigh-speed mobile users, and the rest of the sub-carriers to the other users to assign proper pilot symbols to the users, based on the fact that the ultrahigh-speed mobile users have a traffic volume almost insignificant to the whole traffic volume, thereby optimizing the transmission power caused by the pilot symbols as well as enhancing the total data rate.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
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US12/959,154 2002-12-13 2003-06-02 Apparatus and method for signal constitution for downlink of OFDMA-based cellular system Expired - Fee Related USRE45498E1 (en)

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KR10-2002-0079598A KR100507519B1 (ko) 2002-12-13 2002-12-13 Ｏｆｄｍａ 기반 셀룰러 시스템의 하향링크를 위한 신호구성 방법 및 장치
KR10-2002-0079598 2002-12-13
US10/539,166 US7460466B2 (en) 2002-12-13 2003-06-02 Apparatus and method for signal constitution for downlink of OFDMA-based cellular system
PCT/KR2003/001083 WO2004056022A2 (en) 2002-12-13 2003-06-02 Apparatus and method for signal constitution for downlink of ofdma-based cellular system
US12/959,154 USRE45498E1 (en) 2002-12-13 2003-06-02 Apparatus and method for signal constitution for downlink of OFDMA-based cellular system

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Families Citing this family (139)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US7295509B2 (en) 2000-09-13 2007-11-13 Qualcomm, Incorporated Signaling method in an OFDM multiple access system
US7248559B2 (en) 2001-10-17 2007-07-24 Nortel Networks Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
KR100507519B1 (ko) 2002-12-13 2005-08-17 한국전자통신연구원 Ｏｆｄｍａ 기반 셀룰러 시스템의 하향링크를 위한 신호구성 방법 및 장치
US8064528B2 (en) 2003-05-21 2011-11-22 Regents Of The University Of Minnesota Estimating frequency-offsets and multi-antenna channels in MIMO OFDM systems
JP4482293B2 (ja) * 2003-07-03 2010-06-16 パナソニック株式会社 基地局装置および送信方法
KR100929100B1 (ko) * 2003-07-18 2009-11-30 삼성전자주식회사 직교 주파수 분할 다중 접속 방식을 사용하는 통신 시스템에서 서브 채널 할당 장치 및 방법
EP2560316B1 (de) * 2003-08-12 2019-07-24 Godo Kaisha IP Bridge 1 Funkkommunikationsvorrichtung und Pilotsymbolübertragungsverfahren
CN100591059C (zh) * 2003-10-03 2010-02-17 诺基亚公司 接收多载波传输的方法、系统和接收机
KR100918730B1 (ko) * 2003-10-27 2009-09-24 삼성전자주식회사 직교 주파수 분할 다중 방식을 사용하는 통신 시스템에서기지국 구분을 위한 파일럿 패턴 세트 송수신 장치 및 방법
EP1542488A1 (de) * 2003-12-12 2005-06-15 Telefonaktiebolaget LM Ericsson (publ) Verfahren un vorrichtung zur Zuweisung von Kanaladaptierten Pilotsignalen
US7339999B2 (en) 2004-01-21 2008-03-04 Qualcomm Incorporated Pilot transmission and channel estimation for an OFDM system with excess delay spread
US8553822B2 (en) 2004-01-28 2013-10-08 Qualcomm Incorporated Time filtering for excess delay mitigation in OFDM systems
WO2005074166A1 (en) 2004-01-29 2005-08-11 Neocific, Inc. Methods and apparatus for overlaying multi-carrier and direct sequence spread spectrum signals in a broadband wireless communication system
CN1951050B (zh) * 2004-03-15 2013-10-30 苹果公司 用于具有四根发射天线的ofdm系统的导频设计
EP1589687A1 (de) * 2004-04-23 2005-10-26 France Telecom Verfahren zum Senden eines Signals in einem Mehrantennensystem sowie entsprechendes Sendesignal und Kanalschätzungsverfahren
US7457231B2 (en) * 2004-05-04 2008-11-25 Qualcomm Incorporated Staggered pilot transmission for channel estimation and time tracking
WO2006002550A1 (en) * 2004-07-07 2006-01-12 Nortel Networks Limited System and method for mapping symbols for mimo transmission
US8000221B2 (en) 2004-07-20 2011-08-16 Qualcomm, Incorporated Adaptive pilot insertion for a MIMO-OFDM system
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US8040788B2 (en) * 2004-08-13 2011-10-18 Broadcom Corporation Multi-dimensional network resource allocation
KR100929103B1 (ko) 2004-08-17 2009-11-30 삼성전자주식회사 직교주파수다중분할 이동통신시스템에서 고속 순방향 패킷 데이터 서비스를 지원하기 위한 주파수 할당 장치 및 방법
KR20060063632A (ko) * 2004-12-03 2006-06-12 삼성전자주식회사 이동통신 시스템에서 파일럿 톤 전력 할당 장치 및 방법
US7782810B2 (en) * 2004-12-03 2010-08-24 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving packet data symbol in a mobile communication system
US8396153B1 (en) 2004-12-07 2013-03-12 Adaptix, Inc. Cooperative MIMO in multicell wireless networks
US7428268B2 (en) * 2004-12-07 2008-09-23 Adaptix, Inc. Cooperative MIMO in multicell wireless networks
US8160046B2 (en) * 2004-12-22 2012-04-17 Qualcomm Incorporated Control channel assignment in a wireless communication network
KR100594086B1 (ko) 2005-01-04 2006-06-30 삼성전자주식회사 채널 추정을 위한 적응적 파일럿 할당 방법 및 장치
EP1845636A4 (de) 2005-02-03 2012-03-14 Fujitsu Ltd Drahtloses kommunikationssystem und drahtloses kommunikationsverfahren
JP4526977B2 (ja) * 2005-03-02 2010-08-18 株式会社エヌ・ティ・ティ・ドコモ 送信機および送信制御方法
KR100698770B1 (ko) * 2005-03-09 2007-03-23 삼성전자주식회사 광대역 무선통신시스템에서 시공간 부호화 데이터의 부반송파 사상 장치 및 방법
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
JP4610388B2 (ja) * 2005-03-24 2011-01-12 三洋電機株式会社 無線装置
US8422437B2 (en) 2005-03-31 2013-04-16 Nec Corporation Resource assignment method for communication system adapted for change of channel
JP4884722B2 (ja) * 2005-03-31 2012-02-29 株式会社エヌ・ティ・ティ・ドコモ 無線通信装置及び無線通信方法
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US7715460B2 (en) 2005-04-22 2010-05-11 Interdigital Technology Corporation Hybrid orthogonal frequency division multiple access system and method
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
KR101084139B1 (ko) * 2005-06-15 2011-11-17 엘지전자 주식회사 ＤＦＴ ｓｐｒｅａｄ ＯＦＤＭＡ 시스템의 파일럿 전송방법
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US8254360B2 (en) * 2005-06-16 2012-08-28 Qualcomm Incorporated OFDMA control channel interlacing
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
KR101432311B1 (ko) 2005-07-29 2014-08-20 파나소닉 인텔렉츄얼 프로퍼티 코포레이션 오브 아메리카 통신 장치 및 통신 방법
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
TWI423607B (zh) * 2005-08-15 2014-01-11 Motorola Mobility Llc 引示信號傳輸之方法及裝置
US8559295B2 (en) * 2005-08-15 2013-10-15 Motorola Mobility Llc Method and apparatus for pilot signal transmission
US7508842B2 (en) * 2005-08-18 2009-03-24 Motorola, Inc. Method and apparatus for pilot signal transmission
US20070041457A1 (en) 2005-08-22 2007-02-22 Tamer Kadous Method and apparatus for providing antenna diversity in a wireless communication system
US7903628B2 (en) 2005-08-22 2011-03-08 Qualcomm Incorporated Configurable pilots in a wireless communication system
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US8644292B2 (en) 2005-08-24 2014-02-04 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
JP5099004B2 (ja) * 2005-08-26 2012-12-12 日本電気株式会社 スペクトル拡散システム内のチャネル予測支援用の適応型パイロット構造
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US7706455B2 (en) * 2005-09-26 2010-04-27 Intel Corporation Multicarrier transmitter for multiple-input multiple-output communication systems and methods for puncturing bits for pilot tones
US9955438B2 (en) * 2005-09-27 2018-04-24 Qualcomm Incorporated Method and apparatus for carrier allocation and management in multi-carrier communication systems
US20100150056A1 (en) * 2005-09-30 2010-06-17 Matsushita Electric Industrial Co., Ltd. Wireless communication mobile station apparatus and rach data transmitting method
JP4960248B2 (ja) * 2005-09-30 2012-06-27 シャープ株式会社 無線送信装置、無線受信装置、無線通信システム、無線送信方法および無線受信方法
EP1946459B1 (de) 2005-09-30 2017-10-25 Apple Inc. Mimo-kommunikationssystem
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US9210651B2 (en) 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US8045512B2 (en) 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9144060B2 (en) * 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
KR101259100B1 (ko) * 2005-11-04 2013-04-26 엘지전자 주식회사 Ｏｆｄｍ 또는 ｏｆｄｍａ 무선 이동통신 시스템에서의초기 동기를 위한 신호 전송 방법, 초기 동기 획득 방법 및이동통신용 단말
US8582548B2 (en) * 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8149694B2 (en) * 2005-12-01 2012-04-03 Microsoft Corporation Enforcing fairness in ad hoc mesh networks
KR100872043B1 (ko) * 2005-12-29 2008-12-05 삼성전자주식회사 광대역 무선접속 통신시스템에서 파일럿 패턴 결정 장치 및방법
US8831607B2 (en) 2006-01-05 2014-09-09 Qualcomm Incorporated Reverse link other sector communication
KR100876791B1 (ko) * 2006-01-13 2009-01-07 삼성전자주식회사 주파수 분할 다중 접속 시스템에서 부호화 심볼을 매핑하여 전송하는 방법 및 장치
CN100464543C (zh) * 2006-01-27 2009-02-25 东南大学 兼容的单载波正交频分多址信号发送方法
JP4704222B2 (ja) * 2006-01-27 2011-06-15 富士通株式会社 無線通信システム
US8867453B2 (en) * 2006-04-24 2014-10-21 Samsung Electronics Co., Ltd. System and method for subcarrier allocation signaling in a multicarrier wireless network
WO2007123364A1 (en) * 2006-04-24 2007-11-01 Electronics And Telecommunications Research Institute Method of generating pilot pattern for adaptive channel estimation in ofdma systems, method of transmitting/receiving using the pilot pattern and apparatus thereof
KR20130038400A (ko) * 2006-04-28 2013-04-17 닛본 덴끼 가부시끼가이샤 파일럿 신호 송신 방법, 무선 통신 시스템, 그들에 이용되는 장치 및 프로그램
US8780936B2 (en) * 2006-05-22 2014-07-15 Qualcomm Incorporated Signal acquisition for wireless communication systems
US7623487B2 (en) * 2006-05-24 2009-11-24 Nortel Networks Limited OFDM system and method for supporting a wide range of mobility speeds
WO2007138753A1 (ja) * 2006-05-31 2007-12-06 Hitachi Communication Technologies, Ltd. マルチキャリア通信における符号化信号配置方法及び通信装置
US8374161B2 (en) * 2006-07-07 2013-02-12 Qualcomm Incorporated Method and apparatus for sending data and control information in a wireless communication system
JP2008035288A (ja) * 2006-07-28 2008-02-14 Kyocera Corp 無線通信装置及び通信方法
KR100874003B1 (ko) 2006-08-30 2008-12-17 한국전자통신연구원 이동통신시스템에서의 하향링크 파일럿 신호 전송 방법 및장치
CN101150554B (zh) * 2006-09-19 2010-09-29 中兴通讯股份有限公司 一种基于正交频分复用系统的数据发射方法
EP1912374A1 (de) * 2006-10-10 2008-04-16 Nokia Siemens Networks Gmbh & Co. Kg Datenübertragung in einem Mehrnutzer-OFDM-System mit adaptiver Modulation
WO2008050428A1 (en) * 2006-10-26 2008-05-02 Fujitsu Limited Radio base station apparatus, pilot transmitting method thereof and terminal apparatus
US9130618B2 (en) * 2006-10-26 2015-09-08 Alcatel Lucent MIMO communication system with variable slot structure
EP1933480A2 (de) * 2006-12-13 2008-06-18 NTT DoCoMo, Inc. Mobiles Kommunikationsendgerät und mobiles Kommunikationsverfahren
GB0626022D0 (en) * 2006-12-29 2007-02-07 Nokia Corp An apparatus
US20080159448A1 (en) * 2006-12-29 2008-07-03 Texas Instruments, Incorporated System and method for crosstalk cancellation
JP5045127B2 (ja) * 2007-01-31 2012-10-10 富士通モバイルコミュニケーションズ株式会社 無線通信システム
US8036190B2 (en) * 2007-02-27 2011-10-11 Industrial Technology Research Institute Methods and devices for allocating data in a wireless communication system
US7848468B2 (en) * 2007-03-08 2010-12-07 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive pilot symbol allocation method and apparatus
JP5042320B2 (ja) 2007-03-29 2012-10-03 エルジー エレクトロニクス インコーポレイティド 無線通信システムにおけるサウンディング基準信号伝送方法
US7664143B2 (en) 2007-05-01 2010-02-16 Harris Corporation Communications system using adaptive baseband injected pilot carrier symbols and related method
KR101307123B1 (ko) * 2007-05-04 2013-09-10 삼성전자주식회사 직교 주파수 분할 다중 접속 시스템에서의 데이터 송수신방법 및 장치
KR101322643B1 (ko) * 2007-05-23 2013-10-25 고려대학교 산학협력단 다중 입출력 통신 방법 및 이를 이용한 다중 입출력 통신시스템
KR101380558B1 (ko) * 2007-06-19 2014-04-02 엘지전자 주식회사 사운딩 기준신호의 전송방법
KR101378701B1 (ko) * 2007-07-10 2014-03-27 삼성전자주식회사 직교 주파수 분할 다중 접속 방식의 분산 안테나시스템에서 부반송파 할당을 위한 스케줄링 방법
KR100921769B1 (ko) * 2007-07-12 2009-10-15 한국전자통신연구원 하향링크 프레임 생성 방법 및 셀 탐색 방법
KR101321394B1 (ko) * 2007-07-18 2013-10-25 삼성전자주식회사 이동체 안테나 제어 방법 및 이를 이용한 이동체 안테나제어 시스템
KR20090009693A (ko) 2007-07-20 2009-01-23 한국전자통신연구원 하향링크 프레임 생성 방법 및 셀 탐색 방법
CN103338099B (zh) * 2007-08-02 2016-06-29 富士通株式会社 移动通信系统和移动通信系统中的通信方法
BRPI0721890A2 (pt) * 2007-08-02 2011-05-03 Fujitsu Ltd método de arranjo piloto em sistema de comunicação de rádio móvel e transmissor/receptor adotando o mesmo
KR101397039B1 (ko) * 2007-08-14 2014-05-20 엘지전자 주식회사 전송 다이버시티를 사용하는 다중안테나 시스템에서 채널예측 오류의 영향을 감소시키기 위한 ｃｄｍ 방식 신호전송 방법
MX2010001707A (es) 2007-08-14 2010-03-11 Lg Electronics Inc Metodo para adquiri informacion de region de recurso para canal indicador de solicitud automatica hibrido fisico (phich) y metodo para recibir canal de control de vinculo descendente fisico (pdcch).
US8542697B2 (en) * 2007-08-14 2013-09-24 Lg Electronics Inc. Method of transmitting data in a wireless communication system
KR101507785B1 (ko) 2007-08-16 2015-04-03 엘지전자 주식회사 다중 입출력 시스템에서, 채널품질정보를 송신하는 방법
KR101405974B1 (ko) * 2007-08-16 2014-06-27 엘지전자 주식회사 다중입력 다중출력 시스템에서 코드워드를 전송하는 방법
JP4944716B2 (ja) * 2007-09-10 2012-06-06 サンデン株式会社 無線通信モデム
CN101878606B (zh) 2007-11-27 2016-06-01 日本电气株式会社 无线电信号发送装置、方法、接收装置、方法以及程序
US8228809B1 (en) * 2007-12-21 2012-07-24 Adaptix, Inc. Intelligent mode switching in communication networks
US8897269B2 (en) 2008-01-30 2014-11-25 Qualcomm Incorporated Method and apparatus for mitigating pilot pollution in a wireless network
CN101933356B (zh) * 2008-02-05 2014-01-08 夏普株式会社 移动通信装置、基站装置、无线控制方法和移动通信系统
JP2009194853A (ja) * 2008-02-18 2009-08-27 Kyocera Corp 無線通信装置および無線通信方法。
JP4846745B2 (ja) * 2008-02-18 2011-12-28 京セラ株式会社 無線通信装置および無線通信方法。
KR101527022B1 (ko) * 2008-03-14 2015-06-09 엘지전자 주식회사 다중안테나를 갖는 무선 통신 시스템에서 파일럿 전송 방법
US8406279B2 (en) * 2008-04-09 2013-03-26 Industrial Technology Research Institute System and method for pilot design for data transmitted in wireless networks
US8830982B2 (en) 2008-05-05 2014-09-09 Industrial Technology Research Institute System and method for multicarrier uplink control
US8811339B2 (en) 2008-07-07 2014-08-19 Blackberry Limited Handover schemes for wireless systems
CN107819560B (zh) 2008-12-08 2021-08-13 无线未来科技公司 用于蜂窝电信系统中的方法及设备
KR20110019284A (ko) * 2009-08-19 2011-02-25 주식회사 팬택 무선통신시스템에서 상향링크 광대역 측정 신호 전송방법 및 장치, 그를 이용한 하향링크 채널 추정방법
US8582516B2 (en) * 2009-11-09 2013-11-12 Qualcomm Incorporated Reference signaling for a high-mobility wireless communication device
JP4962584B2 (ja) * 2010-03-18 2012-06-27 富士通株式会社 無線通信システム及び無線通信方法
US8537928B2 (en) * 2010-10-08 2013-09-17 Nec Laboratories America, Inc. Channel estimation methods and systems based on power measurement at receivers
KR20150117677A (ko) 2013-02-12 2015-10-20 엘지전자 주식회사 무선 통신 시스템에서 기지국이 단말로 참조 신호를 송신하는 방법 및 이를 위한 장치
US9877233B1 (en) * 2013-07-02 2018-01-23 Sprint Spectrum L.P. Common air-interface control channel

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0938208A1 (de) 1998-02-22 1999-08-25 Sony International (Europe) GmbH Mehrträgerübertragung, kompatible zum existierenden GSM-System
JP2001103114A (ja) 1999-07-28 2001-04-13 Matsushita Electric Ind Co Ltd 送信装置、受信装置及びディジタル無線通信方法
US20010004604A1 (en) * 1999-12-15 2001-06-21 Kabushiki Kaisha Toshiba Radio communication scheme
JP2001238269A (ja) 2000-02-25 2001-08-31 Kddi Corp 無線通信システムのサブキャリア割当方法
US20010055296A1 (en) * 2000-06-27 2001-12-27 Toshiyuki Akiyama Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type
US20010055287A1 (en) 2000-06-27 2001-12-27 Manabu Sawada Communication system and device under OFDM system
US20020039355A1 (en) * 2000-06-21 2002-04-04 Samsung Electronics Co., Ltd. Apparatus and method for gating transmission of a data rate control channel in an HDR mobile communication system
WO2002065685A1 (fr) 2001-02-08 2002-08-22 Wavecom Procede d'extraction d'un motif de reference variable
US6496535B2 (en) * 2001-03-23 2002-12-17 Navini Networks, Inc. Method and system for effective channel estimation in a telecommunication system
WO2004056022A2 (en) 2002-12-13 2004-07-01 Electronics And Telecommunications Research Institute Apparatus and method for signal constitution for downlink of ofdma-based cellular system
US6959052B2 (en) * 2001-03-06 2005-10-25 National Institute Of Information And Communications Technology Incorporated Administrative Agency Receiving apparatus, receiving method, program and information recording medium
US7139322B1 (en) * 2002-07-15 2006-11-21 National Semiconductor Corporation Method for reducing peak-to-average power ratios in a multi-carrier transmission system

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0938208A1 (de) 1998-02-22 1999-08-25 Sony International (Europe) GmbH Mehrträgerübertragung, kompatible zum existierenden GSM-System
US6545997B1 (en) * 1998-02-22 2003-04-08 Sony International (Europe) Gmbh Transmission method and transmission apparatus for transmitting signals on the basis of a OFDM/TDMA-system with pilot symbols
JP2001103114A (ja) 1999-07-28 2001-04-13 Matsushita Electric Ind Co Ltd 送信装置、受信装置及びディジタル無線通信方法
US6993092B1 (en) 1999-07-28 2006-01-31 Matsushita Electric Industrial Co., Ltd. Transmission apparatus, reception apparatus and digital radio communication method
US20010004604A1 (en) * 1999-12-15 2001-06-21 Kabushiki Kaisha Toshiba Radio communication scheme
JP2001238269A (ja) 2000-02-25 2001-08-31 Kddi Corp 無線通信システムのサブキャリア割当方法
US6836484B2 (en) 2000-02-25 2004-12-28 Ddi Corporation Wireless packet communication method and system for transmitting packets between base station and radio terminal station
US20020039355A1 (en) * 2000-06-21 2002-04-04 Samsung Electronics Co., Ltd. Apparatus and method for gating transmission of a data rate control channel in an HDR mobile communication system
US20010055287A1 (en) 2000-06-27 2001-12-27 Manabu Sawada Communication system and device under OFDM system
US20010055296A1 (en) * 2000-06-27 2001-12-27 Toshiyuki Akiyama Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type
US6907026B2 (en) * 2000-06-27 2005-06-14 Hitachi Kokusai Electric Inc. Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type
WO2002065685A1 (fr) 2001-02-08 2002-08-22 Wavecom Procede d'extraction d'un motif de reference variable
US6959052B2 (en) * 2001-03-06 2005-10-25 National Institute Of Information And Communications Technology Incorporated Administrative Agency Receiving apparatus, receiving method, program and information recording medium
US6496535B2 (en) * 2001-03-23 2002-12-17 Navini Networks, Inc. Method and system for effective channel estimation in a telecommunication system
US7139322B1 (en) * 2002-07-15 2006-11-21 National Semiconductor Corporation Method for reducing peak-to-average power ratios in a multi-carrier transmission system
WO2004056022A3 (en) 2002-12-13 2005-05-06 Korea Electronics Telecomm Apparatus and method for signal constitution for downlink of ofdma-based cellular system
WO2004056022A2 (en) 2002-12-13 2004-07-01 Electronics And Telecommunications Research Institute Apparatus and method for signal constitution for downlink of ofdma-based cellular system

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
Cheong Yui Wong, et al., "A Real-time Sub-carrier Allocation Scheme for Multiple Access Downlink OFDM Transmission", 0-7803-5435-4/99 1999 IEEE VTC '99 pp. 1124-1128.
F. Classen, et al., "Channel estimation units for an OFDM system suitable for mobile communication", in ITG Conference on Mobile Radio, Neu-Ulm, germany, Sep. 1995.
Ma. J. Fernandez-Getino Garcia, et al. "Efficient pilot patterns for channel estimation in OFDM systems over HR channels", Proc. IEEE VTC1999.
Magnus Sandell, et al., "A comparative study of pilot-based channel estimators for wireless OFDM", Sep. 1996, Research Reports, LuleA University, Sweden, 1402-1528.
P. Hoeher, et al., "Pilot-symbol-aided channel estimation in time and frequency", Kluwer Academic Publishers, Multi-carrier Spread-Spectrum, 1997.
Srihari Adireddy, et al., "Detection with Embedded Known Symbols; Optimal Symbol Placement and Equalization"; 0-7803-6293-4 2000 IEEE; pp. 2541-2544.

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US7460466B2 (en) 2008-12-02
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ATE411656T1 (de) 2008-10-15
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EP1570588A2 (de) 2005-09-07
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