WO2009016573A2 - Système et procédé de transmission et de réception de signaux mimo-ofdm - Google Patents

Système et procédé de transmission et de réception de signaux mimo-ofdm Download PDF

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Publication number
WO2009016573A2
WO2009016573A2 PCT/IB2008/053007 IB2008053007W WO2009016573A2 WO 2009016573 A2 WO2009016573 A2 WO 2009016573A2 IB 2008053007 W IB2008053007 W IB 2008053007W WO 2009016573 A2 WO2009016573 A2 WO 2009016573A2
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Prior art keywords
symbol
symbols
domain
frequency
spread
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Ceased
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PCT/IB2008/053007
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WO2009016573A3 (fr
Inventor
Dong Wang
Jun Yang
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Classifications

    • 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
    • H04L1/0606—Space-frequency coding
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving

Definitions

  • This invention pertains to the field of data communications, and more particularly to a system and method of transmitting and receiving an orthogonal frequency division multiplexing (OFDM) signal using a spatial multiplexing multiple-input-multiple-output (MIMO) system.
  • OFDM orthogonal frequency division multiplexing
  • MIMO multiple-input-multiple-output
  • OFDM orthogonal frequency division multiplexing
  • MIMO multiple-input-multiple-output
  • WiMAX WiMAX
  • WiMedia® Alliance Ultra- Wideband (UWB) Common Radio Platform employ OFDM.
  • multiple antennas have been incorporated into OFDM systems to provide spatial diversity and/or multiplexing gain, further enhancing efficiency and reliability.
  • One multiple antenna technique is typically referred to as the multiple-input- multiple-output (MIMO) technique.
  • MIMO multiple-input- multiple-output
  • Multiple antennas can be used to simultaneously transmit multiple data streams to increase data rates and/or to improve system robustness against fading.
  • Combining MIMO and OFDM techniques is useful in wideband high-rate communication systems, and has been adopted for use in the IEEE 802.1 In wireless local area networks (WLAN), 3G high-speed downlink packet access (HSDPA) networks and WiMAX networks.
  • WLAN wireless local area networks
  • HSDPA 3G high-speed downlink packet access
  • WiMAX WiMAX
  • WiMedia UWB is based on a multi-band OFDM (MB- OFDM) technique for use over single antenna systems (hereinafter, "WiMedia MB-OFDM Standard").
  • the WiMedia MB-OFDM Standard includes, in part, dual carrier modulation (DCM), according to which four information data bits are mapped to two separate symbols from two different constellation diagrams, similar to 16QAM mapping. The two symbols are modulated onto two separate subcarriers (of 100 available data-bearing subcarriers), where the two subcarriers are spaced apart by 50 (i.e., 100/2) data subcarriers.
  • DCM dual carrier modulation
  • the highest physical layer data rate of a system operating in accordance with the WiMedia MB-OFDM Standard is 480Mbps, which does not meet the demands of future wideband wireless applications, such as HDTV wireless connectivity.
  • the next generation WiMedia UWB systems target more than lGbps physical layer data rates.
  • a system for transmitting data through a plurality of transmitters.
  • the system comprises a symbol mapper configured to receive one bit stream corresponding to a portion of the data and to map at least one set of sequential bits of the one bit stream to a corresponding set of symbols of a symbol stream, the set of symbols comprising at least a first symbol and a second symbol; a symbol spreader configured to receive the set of symbols from the symbol mapper and to generate the set of spread symbols by precoding the set of symbols from the symbol mapper; and a symbol interleaver configured to receive the first and second spread symbols from the symbol spreader, to distribute the first spread symbol to a first transmitter for transmission over a first subcarrier of the non-adjacent subcarriers, and to distribute the second spread symbol to a second transmitter for transmission over a second subcarrier of the non-adjacent subcarriers.
  • a method for transmitting an input bit stream.
  • the method comprises parsing the input bit stream into a plurality of bit streams; mapping the plurality of bit streams to a corresponding plurality of symbol streams, each symbol stream comprising at least one set of symbols representing a group of sequential bits in the corresponding bit stream; precoding the symbols to the spread symbols, associating each of the symbols in the at least one set of spread symbols with different, non-adjacent subcarriers, respectively; and distributing the symbols of the at least one set of spread symbols to different transmitters, respectively, for transmission on the associated non-adjacent subcarriers of different transmitters.
  • a system for transmitting input information bits comprises a first symbol mapper for receiving a first parsed bitstream of the information bits and mapping the first parsed bitstream to a first symbol stream, the first symbol stream comprising a first pair of symbols corresponding to a first set of bits of the first parsed bitstream; a second symbol mapper for receiving a second parsed bitstream of the information bits and mapping the second parsed bitstream to a second symbol stream, the second symbol stream comprising a second pair of symbols corresponding to a second set of bits of the second parsed bitstream; a first symbol spreader for spreading the first pair of symbols to a first pair of spread symbols, which are associated with non-adjacent subcarriers; a second symbol spreader for spreading the second pair to a second pair of spread symbols, which are associated with non-adjacent subcarriers; and a symbol interleaver for distributing the first symbol of the first pair of spread symbols and the second symbol of the second pair of spread symbols to a first transmitter for transmission
  • FIG. 2 is a functional block diagram of one embodiment of an MIMO-OFDM receiving system.
  • FIG. 3 plots frame error rate and noise of the MIMO-OFDM system according to one embodiment as compared to a conventional system.
  • FIG. 4 plots frame error rate and noise of the MIMO-OFDM system according to one embodiment as compared to a conventional system.
  • FIG. 5 is a functional block diagram of another embodiment of an MIMO-OFDM transmission system.
  • FIG. 6 is a function block diagram of another embodiment of an MIMO-OFDM receiving system.
  • FIG. 7 shows a four-subcarrier precoded interleaving pattern according to one embodiment of an MIMO-OFDM system.
  • a precoding MIMO-OFDM scheme for next generation wideband wireless communications systems such as WiMedia UWB systems, distributes precoded symbols to different subcarriers of different transmitters. The symbols are therefore transmitted through uncorrelated channels. Since the transmission channels for two subcarriers of the different transmitters are less correlated than for two subcarriers of the same transmitter, the disclosed embodiments are expected to achieve better performance in actual wideband wireless communications systems.
  • FIG. 1 is a functional block diagram of one embodiment of an MIMO-OFDM transmission system 100.
  • MIMO-OFDM transmission system 100 includes a channel coder 110, a bit interleaver and spatial parser 112, first and second symbol mappers 116 and 118, first and second symbol spreaders 120 and 122, and a spatial-frequency symbol interleaver (SFSI) 125.
  • FSSI spatial-frequency symbol interleaver
  • the transmission system 100 also includes first and second time-domain transformers, such as first and second inverse fast Fourier transformers (IFFTs) 124 and 126, although other implementations of inverse time-domain transformers may be employed.
  • the outputs of the IFFTs 124, 126 are sent to first and second transmitters 140 and 142, including corresponding antenna systems (not shown).
  • MIMO-OFDM transmission system 100 may be a WiMedia UWB system.
  • channel coder 110 which may be a convolutional encoder, for example.
  • the encoded bits are interleaved and parsed into first and second bit streams by bit interleaver and spatial parser 112.
  • the channel coder 110 and the interleaving process of bit interleaver and spatial parser 112 may be omitted, or different types of coders and/or data processing may be incorporated into MIMO-OFDM transmission system 100.
  • the first and second bit streams are mapped by first and second symbol mappers
  • first symbol mapper 116 outputs symbols yi(z ' ) of the first symbol stream and second symbol mapper 118 outputs symbols y 2 (z) of the second symbol stream.
  • first symbol mapper 116 may map four information bits from the first bit stream to two separate sets of VQ points. Thus, for each set of four information bits, first symbol mapper 116 provides a pair of symbols.
  • first and second symbol mappers 116, 118 are input to first and second symbol spreaders 120, 122, respectively, to spread the symbols, so that each spread symbol contains all the information of the four information bits.
  • the symbols may be precoded by modulating the symbol pairs according to dual carrier modulation (DCM), discussed above, so that the symbol pairs are effectively mapped to multiple different constellation points.
  • DCM dual carrier modulation
  • sets of four information bits may be mapped to two separate sets of I/Q points from two separate constellation diagrams, and each constellation is modulated onto two separate subcarriers, i and i + 50, as discussed below.
  • each pair of symbols (representing the same four data bits) is mapped for modulation onto two different subcarriers.
  • the DCM linear precoding matrix is as follows:
  • the mapped symbols are divided into 100 symbol long blocks, and grouped into 50 pairs (x m (i), x m (i + 50)) spread over corresponding subcarriers, where i is the subcarrier index.
  • the first symbol spreader 120 outputs precoded symbols X 1 (Z) and xi(z + 50) and the second symbol spreader 122 outputs precoded symbols X 2 (O and x 2 (z + 50).
  • the spread symbols are input into spatial-frequency symbol interleaver 125.
  • Spatial-frequency symbol interleaver 125 distributes the spread symbols, such that the spread symbols x m ( ⁇ ) having the same m parameter are transmitted on different subcarriers of different transmitters, as follows: s 2 ( X 1 (Z + 50))
  • spatial-frequency symbol interleaver 125 generates S 1 (O and S 1 (Z + 50), which are to be sent to first transmitter 140, from the spread symbols X 1 (O received from first symbol spreader 120 and x 2 (z + 50) received from second symbol spread 122, respectively.
  • spatial-frequency symbol interleaver 125 generates S 2 (O and s 2 (z + 50), which are to be sent to second transmitter 142, from spread symbols X 2 (O received from second symbol spreader 122 and X 1 (Z + 50) received from the first symbol spreader 120, respectively.
  • the symbols are thus distributed onto carriers and transmitted to have a reduced correlation and thereby to improve the diversity gain.
  • the symbols output from the spatial frequency symbol interleaver 125 are fed into first and second IFFTs 124, 126, which generate the time-domain signals for first and second transmitters 140, 142, respectively.
  • first and second IFFTs 124, 126 which generate the time-domain signals for first and second transmitters 140, 142, respectively.
  • S 1 (O and si(/ + 50) are fed into first IFFT 124
  • S 2 (O and s 2 (z + 50) are fed into second IFFT 126.
  • two related symbols originating from the same (parsed) bitstream are distributed to two different subcarriers of two different transmitters.
  • the first output symbol of first symbol spreader 120 is transmitted on the z-th subcarrier through the first transmitter 140, while the second output symbol of first symbol spreader 120 is transmitted on the (i + 50)-th subcarrier through the second transmitter 142.
  • the first output symbol of second symbol spreaderl22 is transmitted on the z-th subcarrier through second transmitter 142, while the second output symbol of second symbol spreader 122 is on the (z + 50)-th subcarrier transmitted through the first transmitter 140.
  • FIG. 2 is a functional block diagram of one embodiment of an MIMO-OFDM receiving system 200, which complements MIMO-OFDM transmission system 100.
  • the various functions shown in FIG. 2 may be physically implemented using a software-controlled microprocessor, hard- wired logic circuits, or a combination thereof.
  • the functional blocks are illustrated as being segregated in FIG. 2 for explanation purposes, they may be combined in any physical implementation.
  • Receiving system 200 includes a channel decoder 210, a bit deinterleaver 212, a symbol spreading demodulator 220, and first and second time-domain transformers 224 and 226. Although the time-domain transformers 224 and 226 are indicated as fast Fourier transformers, other implementations may be employed.
  • Receiving system 200 further includes first and second receivers 240 and 242, corresponding to time-domain transformers 224 and 226.
  • Each of the receivers 240 and 242 may include corresponding antenna systems (not shown).
  • receiving system 200 may be a WiMedia UWB system, for example.
  • Receivers 240, 242 receive the signals including the precoded symbols from transmitters 140, 142 of FIG. 1, which are transformed from the time-domain to the frequency- domain by FFTs 224, 226, respectively.
  • the frequency- domain symbols are indicated as T ⁇ (i), + 50), r 2 (z) and r 2 (z + 50). More particularly, the received frequency- domain signals can be written as follows:
  • the vector n denotes noise.
  • the transformed symbols are demodulated by symbol spreading demodulator 220, which outputs an interleaved, encoded bit sequence.
  • soft bit decision information indicating reliability measures of the received data, may be generated by symbol spreading demodulator 220.
  • the optimal maximum- likelihood (ML) estimator or sub-optimal minimum mean square error (MMSE) or zero-forcing (ZF) linear estimators, can be used to calculate the soft-information for each bit.
  • the bit soft information may include log-likelihood-ratios (LLR).
  • Bit deinterleaver 212 deinterleaves the interleaved, encoded bit sequence and soft bit decision information and outputs an encoded bit sequence and its corresponding soft bit decision information.
  • Channel decoder 210 decodes the encoded bit sequence and outputs an output data sequence corresponding to the input information bits of FIG. 1.
  • FIGS. 3 and 4 depict simulation results comparing frame error rate performances of MIMO-OFDM systems according to embodiments of the present invention (indicated by plotted lines with x's) with a conventional system, for example, as described in
  • the simulations used typical UWB channel models, such as IEEE standard UWB channel models.
  • the simulation of FIG. 3 used an IEEE CMl channel model from the IEEE 802.15.3a working group, which is a short range (i.e., less than four meters) line-of-sight communication
  • the simulation of FIG. 4 used an IEEE CM2 channel model, which is a short range non-line-of-sight communication.
  • FIGS. 3 and 4 show that the depicted embodiments have approximately 1 dB improvement over the conventional system for any given frame error rate.
  • FIGS. 5 and 6 are functional block diagrams of a more generalized embodiment of an MIMO-OFDM data communication system, in which there are two or more transmitters and corresponding transmit antennas.
  • the MIMO-OFDM transmission system 500 of FIG. 5 includes M transmit antennas and the MIMO-OFDM receiving system 600 of FIG. 6 includes N receive antennas.
  • MIMO-OFDM transmission system 500 includes a channel coder 510, a bit interleaver and spatial parser 512, symbol mappers 516 through 518, symbol spreaders 520 through 522, and a spatial-frequency symbol interleaver (SFSI) 525.
  • MIMO-OFDM transmission system 500 also includes time-domain transformers, such as inverse fast Fourier transformers (IFFTs) 524 through 526, although other implementations of inverse time-domain transformers may be employed.
  • IFFTs inverse fast Fourier transformers
  • the outputs of IFFTs 524, 526 are sent to first and second transmitters 540 and 542, including corresponding antenna systems (not shown).
  • An information bit stream is input into channel coder 510.
  • the coded bits are parsed into M bit streams by bit interleaver and spatial parser 512, as discussed above with respect to the bit interleaver and spatial parser 112.
  • Each of the parsed bit streams are mapped to symbol streams by multiple symbol mappers, indicated by representative symbol mappers 516 through 518, where the output symbols may be from PSK or QAM constellations, for example.
  • the precoding may be linear or nonlinear.
  • a linear precoder disclosed in International Patent Application No. PCT/IB2006/054720 can be used for QAM symbol mappings.
  • nonlinear precoder may be represented by the following equation, in which where/is a mapping function:
  • Spatial-frequency symbol interleaver 525 assures that symbols x m (z) having the same m parameter are transmitted on different subcarriers of as many as possible different transmitters, e.g., transmitters 540 through 542, so that the channels on which they are transmitted have reduced correlation, thereby achieving an improved diversity gain.
  • the precoded symbols are transformed to the time- domain by multiple time-domain transformers, indicted by representative IFFTs 524 through 526, for transmission by M transmitters through corresponding antenna systems.
  • the interleaving process of spatial-frequency symbol interleaver 525 can be performed according to the following equation:
  • Each transmitter 1 through 4 thus transmits only one symbol from any particular bitstream m, enhancing diversity gain.
  • transmitter 1 sends X 1 (Z 1 ), X 4 (Z 2 ), X 3 (Z 3 ) and x 2 (z 4 ), each of which are from different bitstreams. Further, each symbol is transmitted on a different subcarrier.
  • receiving system 600 receives the time-domain symbols through multiple (N) receivers each having a corresponding antenna system (not shown), indicated by representative receivers 640 through 642.
  • the symbol spreading demodulator 620 all of the frequency- domain symbols r n (i) are grouped together and bit soft decision information is calculated, through an ML estimator or other suboptimal estimator, as discussed above.
  • the channel decoder 610 decodes the deinterleaved soft bit information to obtain decoded bits, thus recovering the information bits input to the transmission system 500.
  • Various embodiments may include MIMO-OFDM data communication systems in which multiple antennas are used to achieve high data rates, such as IEEE802.1 In WLAN, 3G WCDMA HSDPA, WiMax and MB-OFDM based WiMedia UWB systems.
  • a current WiMedia UWB system may be upgraded to a MIMO UWB system, according to various embodiments, since many of the baseband components of the WiMedia UWB system may be incorporated. Accordingly, data rates increase significantly while a reasonable robustness is maintained, even when a weak channel code is used. It is understood that this scheme can be naturally extended to systems with other channel codes and space-time coded schemes, such as turbo codes, space-time trellis codes, and the like.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un système de communication qui transmet des données par l'intermédiaire de multiples émetteurs (140/142, 540/542). Ledit système comprend un dispositif de mappage (116/118, 516/518) de symboles, un dispositif d'étalement (120/122, 520/522) de symboles et un dispositif d'entrelacement (125, 525) de symboles. Le dispositif de mappage (116/118, 516/518) de symboles reçoit un train binaire de données et met en correspondance au moins un ensemble de bits d'un train binaire avec un ensemble correspondant de symboles d'un flux de symboles. L'ensemble de symboles comprend au moins deux symboles. Le dispositif d'étalement de symboles reçoit l'ensemble de symboles du dispositif de mappage (116/118, 516/518) de symboles et étale l'ensemble de symboles de manière que chacun des symboles étalés contienne toute les informations de l'ensemble de symboles du dispositif de mappage (116/118, 516/518) de symboles. Le dispositif d'entrelacement (125, 525) de symboles reçoit les symboles étalés des dispositifs d'étalement (120/122, 520/522) de symboles de tous les flux de symboles et distribue les symboles étalés à des sous-porteuses non adjacentes des émetteurs (140/142, 540/542) de manière que les symboles étalés du même dispositif d'étalement de symboles soient distribués à différentes sous-porteuses de différents émetteurs.
PCT/IB2008/053007 2007-07-27 2008-07-25 Système et procédé de transmission et de réception de signaux mimo-ofdm Ceased WO2009016573A2 (fr)

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US9300504B2 (en) 2009-12-31 2016-03-29 Intel Corporation Mobile device transmitter and methods for transmitting signals in different signal dimensions for 3GPP LTE
CN102340474A (zh) * 2009-12-31 2012-02-01 英特尔公司 用符号加载降低严重干扰的影响的ofdm传送器和方法
WO2011081809A2 (fr) 2009-12-31 2011-07-07 Intel Corporation Émetteur ofdm et procédés de réduction des effets de brouillage intense par chargement de symboles
CN106027433A (zh) * 2009-12-31 2016-10-12 英特尔公司 用符号加载降低严重干扰的影响的ofdm传送器和方法
EP2520053A4 (fr) * 2009-12-31 2013-05-22 Intel Corp Émetteur ofdm et procédés de réduction des effets de brouillage intense par chargement de symboles
CN102340474B (zh) * 2009-12-31 2016-08-10 英特尔公司 用符号加载降低严重干扰的影响的ofdm传送器和方法
US9722683B2 (en) 2009-12-31 2017-08-01 Intel Corporation Mobile device transmitter and methods for transmitting signals in different signal dimensions for 3GPP LTE
JP2015046888A (ja) * 2009-12-31 2015-03-12 インテル コーポレイション シンボル負荷による過酷な干渉の効果を低減するためのｏｆｄｍ送信機および方法
EP2533528A4 (fr) * 2010-02-04 2013-07-17 Lg Electronics Inc Émetteur et récepteur de signaux de radiodiffusion et procédé d'émission et de réception de signaux de radiodiffusion
EP2533525A4 (fr) * 2010-02-04 2013-07-10 Lg Electronics Inc Émetteur et récepteur de signal de radiodiffusion, et procédé d'émission et de réception de signal de radiodiffusion
WO2012047652A1 (fr) 2010-09-27 2012-04-12 Qualcomm Atheros, Inc. Procédé et appareil pour coder et entrelacer des communications sans fil à très haut débit
EP2622745A4 (fr) * 2010-09-27 2018-01-10 Qualcomm Incorporated Procédé et appareil pour coder et entrelacer des communications sans fil à très haut débit
WO2012142907A1 (fr) * 2011-04-21 2012-10-26 中兴通讯股份有限公司 Procédé et système d'envoi de données
JP2018537906A (ja) * 2015-11-13 2018-12-20 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． データ送信方法および装置
US10819553B2 (en) 2015-11-13 2020-10-27 Huawei Technologies Co., Ltd. Data transmission method and apparatus
KR20180084852A (ko) * 2015-11-13 2018-07-25 후아웨이 테크놀러지 컴퍼니 리미티드 데이터 전송 방법 및 장치
JP7216681B2 (ja) 2015-11-13 2023-02-01 華為技術有限公司 データ送信方法および装置
US11140017B2 (en) 2015-11-13 2021-10-05 Huawei Technologies Co., Ltd. Data transmission method and apparatus
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KR102137646B1 (ko) 2015-11-13 2020-07-24 후아웨이 테크놀러지 컴퍼니 리미티드 데이터 전송 방법 및 장치
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