EP1665616A2 - Systemes a antennes multiples et procedes utilisant des codes de blocs a frequence spatiale a haut debit - Google Patents

Systemes a antennes multiples et procedes utilisant des codes de blocs a frequence spatiale a haut debit

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Publication number
EP1665616A2
EP1665616A2 EP04788700A EP04788700A EP1665616A2 EP 1665616 A2 EP1665616 A2 EP 1665616A2 EP 04788700 A EP04788700 A EP 04788700A EP 04788700 A EP04788700 A EP 04788700A EP 1665616 A2 EP1665616 A2 EP 1665616A2
Authority
EP
European Patent Office
Prior art keywords
symbol
symbol vectors
precoded
group
vectors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP04788700A
Other languages
German (de)
English (en)
Inventor
Lei Shao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intel Corp
Original Assignee
Intel Corp
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 claimed from US10/814,113 external-priority patent/US7315577B2/en
Application filed by Intel Corp filed Critical Intel Corp
Publication of EP1665616A2 publication Critical patent/EP1665616A2/fr
Ceased legal-status Critical Current

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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
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block 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
    • H04L1/02—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
    • H04L27/2602—Signal structure

Definitions

  • wireless signals may be transmitted using more than one transmit antenna over more than one spatial channel utilizing the same frequency subcarriers.
  • These systems are sometimes referred to multiple-input multiple-output (MIMO) systems and may exploit the multipath diversity between the antennas.
  • MIMO systems may encode the signals using convolutional encoding and/or Viterbi encoding, however these techniques are sensitive to antenna separation and antenna fading correlation.
  • FIG. 1 is a block diagram of a multicarrier transmitter in accordance with some embodiments of the present invention
  • FIG. 2 illustrates precoded symbol vectors in accordance with some embodiments of the present invention
  • FIG. 3 illustrates space-frequency mapping in accordance with some embodiments of the present invention
  • FIG.4 is a block diagram of a multicarrier receiver in accordance with some embodiments of the present invention
  • FIG. 5 is a flow chart of a space-frequency symbol transmission procedure in accordance with some embodiments of the present invention
  • FIG. 6 is a flow chart of a symbol reception and decoding procedure in accordance with some embodiments of the present invention.
  • FIG. 1 is a block diagram of a multicarrier transmitter in accordance with some embodiments of the present invention.
  • Multicarrier transmitter 100 may be part of a wireless communication device, and may transmit multicarrier communication signals, such as orthogonal frequency division multiplexed (OFDM) communication signals, over a multicarrier communication channel.
  • multicarrier transmitter 100 encodes symbols for transmission on a multicarrier communication channel comprising more than one spatial channel and may use more than one of transmit antennas 114.
  • multicarrier transmitter 100 uses high-throughput space-frequency block codes and may not require the use of convolutional or error-correcting coding, although the scope of the present invention is not limited in this respect.
  • the use of high- throughput space-frequency block codes by multicarrier transmitter 100 may eliminate the need for Viterbi decoding, although the scope of the invention is not limited in this respect.
  • increased throughput and/or increased range may be achieved through the use of high-throughput space-frequency block codes over systems using convolutional codes with similar bit-error rates and bandwidths.
  • multicarrier transmitter 100 may comprise precoder 106 to encode a plurality of symbol vectors 105 by multiplying each symbol vector 105 by a complex field matrix to generate precoded symbol vectors 107.
  • multicarrier transmitter 100 may comprise partitioner 108 to group precoded symbol vectors 107 into a plurality of groups 109. Each group 109 may more than one of precoded symbol vectors 107.
  • multicarrier transmitter 100 may also comprise space-frequency symbol mapper 110 to map each precoded symbol of the precoded symbol vectors 107 to one of a plurality of subcarriers of a multicarrier communication channel and to one of a plurality of spatial channels.
  • space-frequency symbol mapper 110 may map precoded symbols to one of the subcarriers and to one of the spatial channels at least in part based on the symbol's group and the symbol's position within the group, although the scope of the present invention is not limited in this respect. In some embodiments, space-frequency symbol mapper 110 may map precoded symbols to one of the subcarriers and to one of transmit antennas 114 based at least in part based on the symbol's group and the symbol's position within the group, although the scope of the present invention is not limited in this respect. In these embodiments, each of transmit antennas 114 may be associated with one of the spatial channels, although the scope of the invention is not limited in this respect.
  • multicarrier transmitter 100 may further comprise symbol mapper 102 to generate a serial symbol stream of symbols 103 from an input serial bit stream 101.
  • mapper 102 may be quadrature amplitude modulated (QAM) symbol mapper to generate a serial symbol stream of QAM symbols, although the scope of the invention is not limited in this respect.
  • multicarrier transmitter 100 may further comprise serial-to-parallel converter 104 to generate the plurality of parallel symbol vectors 105 from the serial symbol stream. Each of symbol vectors 105 may have more than one symbol.
  • parallel symbol vectors 105 may be QAM symbol vectors.
  • multicarrier transmitter 100 may further comprise inverse fast Fourier transform (IFFT) circuitry 112 to generate signals 113 for RF transmission on a corresponding one of the spatial channels or a corresponding one of transmit antennas 114 from space-frequency mapped symbols 111 provided by space-frequency symbol mapper 110.
  • signals 113 may be packetized signals for transmission.
  • circuitry may be included in the signal path after IFFT circuitry 112 to add a cyclic prefix (CP) to signals 113 to help reduce inter-symbol interference, although the scope of the present invention is not limited in this respect.
  • each of transmit antennas 114 may correspond to one of the spatial channels, although the scope of the present invention is not limited in this respect.
  • precoder 106 may be a linear-square precoder and may separately precode each of parallel symbol vectors 105 to generate a plurality of parallel precoded symbol vectors 107.
  • the complex field matrix e.g., theta
  • precoder 106 may be a square complex field matrix having a substantially row- wise Vandermonde structure, although the scope of the invention is not limited in this respect.
  • a Vandermonde matrix may refer to a type of matrix that arises in the polynomial least squares fitting of Lagrange interpolating polynomials and the reconstruction of a statistical distribution from the distribution's moments, although the scope of the invention is not limited in this respect.
  • precoder 106 may encode an MxG number of parallel symbol vectors 105, and each parallel symbol vector 105 may have MxK symbols.
  • partitioner 108 may group precoded symbol vectors 107 into G groups 109 of the parallel symbol vectors 107. Each of groups 109 may have M of the precoded symbol vectors 107.
  • M, G and K may be positive integers less than 100, although the scope of the present invention is not limited in this respect.
  • M may correspond to a number of spatial channels and/or transmit antennas 114.
  • M may be four
  • G may be two
  • K may be two.
  • the total number of symbols transmitted may be the number of symbols per symbol vector (i.e., MxK) times the number of vectors (i.e., MxG) which would be 64 symbols.
  • Sixteen symbols i.e., one for each of the sixteen data subcarriers
  • K and G may be selected based on the number of subcarriers and the number of antennas, among other things.
  • FIG. 2 illustrates precoded symbol vectors in accordance with some embodiments of the present invention.
  • the symbols of precoded symbol vectors 207 may be associated with a layer of symbols.
  • Precoded symbol vectors 207 may correspond to precoded symbol vectors 107 (FIG. 1), although the scope of the invention is not limited in this respect.
  • Precoded symbol vectors 207 may be grouped into two or more groups 209. Each precoded symbol vector 207 may comprise a plurality of precoded symbols 203. In some embodiments, there may be M layers for each of G groups. In some embodiments, the number of layers M may at most be no more than the number of transmit antennas.
  • a space-frequency symbol mapper such as space-frequency symbol mapper 110 (FIG.
  • space- frequency symbol mapper 110 may map MxKxG symbols to each transmit antenna and/or spatial channel and may provide the mapped symbols in multiples of the MxKxG symbols to IFFT circuitry, such as IFFT circuitry 112 (FIG. 1), associated with the transmit antennas for modulation on the subcarriers.
  • FIG. 1 space- frequency symbol mapper 110
  • FIG. 2 illustrates embodiments of the present invention which include four layers for each of the two groups (i.e., groups 109) of precoded symbol vectors 207 in which each of precoded symbol vectors 207 comprises eight of precoded symbols 203.
  • space-frequency symbol mapper 110 (FIG. 1) may map at least some precoded symbols 203 of the layers to the subcarriers and the transmit antennas in a sequential manner based on the precoded symbol's group and position within the group, although the scope of the present invention is not limited in this respect.
  • a first precoded symbol of a first group may be mapped to a first subcarrier and first transmit antenna
  • a second precoded symbol of the first group may be mapped to a second subcarrier and a second transmit antenna, etc.
  • the specific mapping may be selected to achieve, among other things, increased diversity.
  • FIG. 3 illustrates space-frequency mapping in accordance with some embodiments of the present invention.
  • Precoded symbols 303 may be mapped to one of transmit antennas 114 (FIG. 1) or spatial channels 302 (illustrated in rows) and to one of subcarriers 304 (illustrated in columns) based on the precoded symbol's layer and group.
  • precoded symbols 303 may correspond to precoded symbols 203 (FIG.
  • precoded symbols 303 of the first group may be mapped to subcarriers one through four and subcarriers nine through twelve, while precoded symbols 303 of the second group may be mapped to subcarriers five through eight and subcarriers thirteen through sixteen.
  • precoded symbols 303 of a particular layer may be mapped diagonally in this illustration.
  • first symbol 306 of the first layer may be mapped to the first subcarrier and the first transmit antenna
  • second symbol 308 of the first layer may be mapped to the second subcarrier and the second transmit antenna
  • third symbol 310 of the first layer may be mapped to the third subcarrier and the third transmit antenna
  • fourth symbol 312 of the first layer may be mapped to the fourth subcarrier and the fourth transmit antenna
  • fifth symbol 314 of the first layer may be mapped to the ninth subcarrier and the first transmit antenna
  • sixth symbol 316 of the first layer may be mapped to the tenth subcarrier and the second transmit antenna
  • seventh symbol 318 of the first layer may be mapped to the eleventh subcarrier and the third transmit antenna
  • eighth symbol 310 of the first layer may be mapped to the twelfth subcarrier and the fourth transmit antenna.
  • the spatial channels may be correlated (e.g., non-orthogonal in frequency) channels.
  • each spatial channel may employ the same frequency symbol-modulated subcarriers.
  • uncorrelation e.g., at least partial orthogonality
  • transmit antennas 114 may have a spacing therebetween of at least approximately a half- wavelength of a transmit frequency. In some embodiments, the spacing may be selected so that the different antennas undergo uncorrelated channel fading.
  • the high-throughput space-frequency block codes employed by multicarrier transceiver 100 may not be sensitive to small antenna spacing or separations, and may be robust to antenna fading correlations.
  • the antenna separation may be small relative to the wavelength of transmission.
  • uncorrelation between the spatial channels may be achieved through beamforming, although the scope of the invention is not limited in this respect.
  • the multicarrier communication channel may comprise a plurality of symbol-modulated subcarriers.
  • each symbol-modulated subcarrier may have a null at substantially a center frequency of the other subcarriers to achieve substantial orthogonality between the subcarriers of the multicarrier commuiiication channel.
  • the multicarrier communication channel may be an orthogonal frequency division multiplexed (OFDM) communication channel comprising a plurality of OFDM subcarriers, although the scope of the invention is not limited in this respect.
  • multicarrier transmitter 100 may utilize more than one of spatially-diverse transmit antennas 114 to "divide" the channel into one or more spatial channels.
  • each transmit antenna may define one spatial transmit channel.
  • multicarrier transmitter 100 may employ beamforming techniques to "divide" the channel into spatial channels.
  • each spatial channel may be used to communicate separate or independent data streams on the same subcarriers as the other spatial channels, allowing the communication of additional data without an increase in frequency bandwidth.
  • spatial channels may take advantage of the multipath characteristics of the channel.
  • the spatial channels may be non-orthogonal channels, although the scope of the invention is not limited in this respect.
  • serial-to-parallel converter 104 may operate in the signal path prior to mapper 102.
  • mapper 102 of multicarrier transmitter 100 may symbol-modulate the subcarriers in accordance with individual subcarrier modulation assignments. This may be referred to as adaptive bit loading (ABL). Accordingly, one or more bits may be represented by a symbol modulated on a subcarrier.
  • ABL adaptive bit loading
  • the modulation assignments for the individual subchannel may be based on the channel characteristics or channel conditions for that subcarrier, although the scope of the invention is not limited in this respect.
  • the subcarrier modulation assignments may range from zero bits per symbol to up to ten or more bits per symbol.
  • a multicarrier symbol may be viewed as the combination of the symbols modulated on the individual subcarriers. Because of the variable number of bits per symbol-modulated subcarrier and the variable number of subchannels that may comprise a multicarrier channel, the number of bits per multicarrier symbol may vary greatly.
  • the frequency spectrums for a multicarrier communication channel may comprise subcarriers in either a 5 GHz frequency spectrum or a 2.4 GHz frequency spectrum.
  • the 5 GHz frequency spectrum may include frequencies ranging from approximately 4.9 to 5.9 GHz
  • the 2.4 GHz spectrum may include frequencies ranging from approximately 2.3 to 2.5 GHz, although the scope of the invention is not limited in this respect, as other frequency spectrums are also equally suitable.
  • FIG. 4 is a block diagram of a multicarrier receiver in accordance with some embodiments of the present invention.
  • Multicarrier receiver 400 may be part of a wireless communication device, and may receive multicarrier communication signals, such as OFDM communication signals, over a multicarrier communication channel.
  • multicarrier receiver 400 may be part of a communication station which may also comprise a multicarrier transmitter, such as multicarrier transmitter 100 (FIG. 1), although other multicarrier transmitters may also be suitable.
  • multicarrier receiver 400 may receive signals over a multicarrier communication channel over more than one spatial channel and may use more than one of receive antennas 402.
  • multicarrier receiver 400 decodes signals that may have been encoded with high-throughput space-frequency block codes and may not require the use convolutional or error-correcting decoding, although the scope of the present invention is not limited in this respect.
  • the use of high-throughput space-frequency block codes may eliminate the need for Viterbi decoding, although the scope of the invention is not limited in this respect.
  • increased throughput and/or increased range may be achieved through the use of high-throughput space-frequency block codes over systems using convolutional codes with similar bit-error rates and bandwidths.
  • multicarrier receiver 400 decodes signals received over a multicarrier communication channel encoded with high-throughput space-frequency block codes using an iterative nulling process to successively cancel interference from layers of the symbols.
  • multicarrier receiver 400 may comprise demultiplexer 406 to generate groups of symbol vectors 407 by combining corresponding subcarrier frequency components of received symbol vectors 405. Each group of symbol vectors 407 may have symbol components combined from different subcarriers.
  • symbol vectors 407 may be generated by demultiplexer 406 in G groups (two groups are illustrated in FIG. 4). In some embodiments, each of symbol vectors 407 may have a length of MxK encoded symbols.
  • demultiplexer 406 may reshape row vectors into column vectors to collect and group information from some subcarriers received on all receive antennas 402, although the scope of the invention is not limited in this respect.
  • Multicarrier receiver 400 may also comprise null canceller 408 associated with each group of symbol vectors 407 to perform null canceling on a per-subcarrier basis for symbol vectors of the associated group based on a decoded symbol vector 420.
  • Null canceller 408 may generate null-cancelled symbol vectors 409.
  • Multicarrier receiver 400 may also comprise decoder 410 associated with each group to decode null-cancelled symbol vectors 409.
  • decoder 410 may be a sphere decoder to spherically decode layers of symbols of the associated group and to multiply an output of decoder 410 (one decoded layer at a time) by a complex-field matrix, which may be referred to as theta. In this way, decoder 410 may regenerate precoded symbol vector 420 (e.g., to regenerate the current layer) for null canceller 408 so that null canceller 408 may cancel the current layer's contribution from symbol vectors 407 until all layers are decoded.
  • precoded symbol vector 420 e.g., to regenerate the current layer
  • nulling may be done once for each subcarrier while canceling may be done for M-l iterations until all layers are decoded, although the scope of the invention is not limited in this respect.
  • decoder 410 may perform maximum-likelihood (ML) detection within a sphere or spherical limit, unlike an exhaustive ML detection.
  • decoder 410 may generate decoded QAM symbol vectors 411 for each subcarrier of the multicarrier communication channel.
  • null canceller 408 may null symbols so that the i th layer may still have interference from the first layer through the i th -l layer, and substantially no interference from the i th +l layer to the M th layer within a symbol vector for a specific subcarrier frequency, although the scope of the invention is not limited in this respect.
  • null canceller 408 may also cancel some elements in symbol vectors 407 after nulling based on symbol vector 420. This may be performed successively until all layers are decoded. In some embodiments, this may be an iterative process. For example, during a first iteration, nothing may be cancelled so the decoded symbol vector 420 fed back may be zero.
  • multicarrier receiver 400 may also comprise FFT circuitry 404 to demodulate subcarriers of the multicarrier communication channel received through receive antennas 402 to generate the received symbol vectors 405 associated with each receive antenna.
  • Received symbol vectors 405 i.e., from each antenna 402 may include symbol components from each of the subcarriers of the multicarrier communication channel.
  • the number of receive antennas 402 may be greater than or equal to the number of transmit antennas or spatial channels used in transmitting the multicarrier communication signal, although the scope of the present invention is not limited in this respect.
  • multicarrier receiver 400 may also comprise symbol demapper 412 to demap the decoded symbol vectors 111 for each group to generate a plurality of parallel sets of bits 413.
  • Symbol demapper 412 may be QAM demapper, although the scope of the invention is not limited in this respect.
  • multicarrier receiver 400 may also comprise parallel-to-serial converter 414 to generate serial bit stream 415 from the plurality of parallel sets of bits 413.
  • circuitry (not illustrated) may be included in the signal path before FFT circuitry 404 to remove a cyclic prefix (CP) added by the transmitter to help reduce inter-symbol interference, although the scope of the present invention is not limited in this respect.
  • CP cyclic prefix
  • Multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 may be part of a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point or other device that may receive and/or transmit information wirelessly.
  • PDA personal digital assistant
  • multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 may be part of a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point or other device that may receive and/or transmit information wirelessly.
  • PDA personal digital assistant
  • multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 may be part of a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a wireless headset,
  • RF radio- frequency
  • IEEE Institute of Electrical and Electronics Engineers
  • transmitter 100 (FIG. 1) and/or receiver 400 may also be suitable to transmit and/or receive communications in accordance with other techniques including the Digital Video Broadcasting Terrestrial (DVB-T) broadcasting standard, and the High performance radio Local Area Network (HiperLAN) standard.
  • DVD-T Digital Video Broadcasting Terrestrial
  • HiperLAN High performance radio Local Area Network
  • Some embodiments of the present invention are discussed in the exemplary context of an 802.1 lx implementation (e.g., 802.1 la, 802.1 lg, 802.11 HT, etc.), the claims are not so limited.
  • Some embodiments of the present invention may be implemented as part of any wireless system using multicarrier wireless communication channels (e.g., orthogonal frequency-division multiplexing (OFDM), discrete multi-tone modulation (DMT), etc.), such as may be used within, without limitation, a wireless personal area network (WPAN), a wireless local area network (WLAN), a wireless metropolitan are network (WMAN), a wireless wide area network (WWAN), a cellular network, a third generation (3G) network, a fourth generation (4G) network, a universal mobile telephone system (UMTS), and the like communication systems.
  • WPAN wireless personal area network
  • WLAN wireless local area network
  • WMAN wireless metropolitan are network
  • WWAN wireless wide area network
  • UMTS universal mobile telephone system
  • each of transmit antennas 114 (FIG. 1) and each of receive antennas 402 may comprise a directional or omnidirectional antenna, including, for example, a dipole antenna, a monopole antenna, a loop antenna, a microstrip antenna or other type of antenna suitable for reception and/or transmission of RF signals.
  • multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 may be part of a single multicarrier communication station. Although multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 are illustrated as part of one or more wireless communication devices, multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 may be part of almost any wireless or wireline communication device, including a general purpose processing or computing system.
  • multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 may be part of a battery-powered device. In some embodiments, when transmitter 100 (FIG. 1) and receiver 400 are part of a communication station, transmit and receive antennas may be shared, although the scope of the invention is not limited in this respect. Although multicarrier transmitter 100 (FIG. 1) and/or multicarrier receiver 400 are illustrated as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software- configured elements, such as processing elements including digital signal processors (DSPs), and/or other hardware elements.
  • DSPs digital signal processors
  • the illustrated elements may comprise one or more microprocessors, DSPs, application specific integrated circuits (ASICs), and combinations of various hardware and logic circuitry for performing at least the functions described herein.
  • terms such as processing, computing, calculating, determining, displaying, or the like may refer to an action and/or process of one or more processing or computing systems or similar devices that may manipulate and transform data represented as physical (e.g., electronic) quantities within a processing system's registers and memory into other data similarly represented as physical quantities within the processing system's registers or memories, or other such information storage, transmission or display devices.
  • computing device includes one or more processing elements coupled with computer-readable memory that may be volatile or non- volatile memory or a combination thereof.
  • Space-frequency symbol transmission procedure 500 may be performed by a multicarrier transmitter, such as multicarrier transmitter 100 (FIG. 1), although other multicarrier transmitters may also be suitable.
  • procedure 500 may encode symbols for transmission over a multicarrier communication channel comprising more than one spatial channel and may use more than one transmit antenna.
  • Operation 502 comprises generating a serial symbol stream from an input serial bit stream.
  • operation 502 may be performed by a symbol mapper, such as mapper 102 (FIG. 1).
  • Operation 504 comprises generating a plurality of parallel symbol vectors from the serial symbol stream. Each of the symbol vectors may have more than one symbol.
  • operation 504 may be performed by a serial-to-parallel converter, such as serial-to-parallel converter 104 (FIG. 1).
  • Operation 506 comprises encoding the plurality of symbol vectors by multiplying each of the symbol vectors by a complex field matrix to generate precoded symbol vectors.
  • operation 506 comprises encoding the symbol vectors with a linear-square precoder to separately precode each of the plurality of parallel symbol vectors to generate a plurality of parallel precoded symbol vectors.
  • the complex field matrix may be a square complex field matrix having substantially a rowwise Vandermonde structure, although the scope of the invention is not limited in this respect.
  • operation 506 may be performed by a precoder, such as precoder 106 (FIG. 1).
  • Operation 508 comprises grouping the precoded symbol vectors into a plurality of groups. Each group may have more than one of the precoded symbol vectors.
  • operation 508 may be performed by a partitioner, such as partitioner 108 (FIG. 1).
  • Operation 510 comprises mapping precoded symbols of the precoded symbol vectors to one of a plurality of subcarriers of the multicarrier communication channel and to one of a plurality of spatial channels at least in part based on the precoded symbol's group and the precoded symbol's position within the group.
  • operation 510 may comprise mapping the precoded symbols of the precoded symbol vectors to one of the subcarriers of the multicarrier communication channel and to one of a plurality of transmit antennas. Each transmit antenna may correspond to one of the spatial channels, although the scope of the invention is not limited in this respect.
  • operation 510 may be performed by a space-frequency symbol mapper, such as space-frequency symbol mapper 110 (FIG. 1).
  • Operation 512 comprises performing an inverse fast Fourier transform (IFFT) to generate modulated signals for RF transmission on a corresponding one of the spatial channels from space-frequency mapped symbols generated in operation 510.
  • FIG. 6 is a flow chart of a symbol reception and decoding procedure in accordance with some embodiments of the present invention.
  • Symbol reception and decoding procedure 600 may be performed by a multicarrier receiver, such as multicarrier receiver 400 (FIG. 4), although other multicarrier receivers may also be suitable.
  • Procedure 600 may be performed to decode signals that were transmitted by a multicarrier transmitter, such as multicarrier transmitter 100 (FIG. 1) or to decode multicarrier signals that were generated by procedure 500 (FIG. 5), although the scope of the invention is not limited in this respect.
  • Operation 604 comprises demodulating subcarriers of the multicarrier communication signal received over a plurality of receive antennas to generate the received symbol vectors associated with each receive antenna.
  • the received symbol vectors may include symbol components from each of the subcarriers of the multicarrier communication channel.
  • operation 604 may be performed by FFT circuitry, such as FFT circuitries 404 (FIG. 4).
  • Operation 606 comprises generating groups of symbol vectors by combining corresponding subcarrier frequency components of the received symbol vectors.
  • operation 606 comprises reshaping and/or demultiplexing the symbol vectors.
  • each group of symbol vectors may comprise symbol components combined from different subcarriers.
  • operation 606 may be performed by a demultiplexer, such as demultiplexer 406 (FIG. 4).
  • Operation 608 comprises performing null canceling on a per-subcarrier basis for symbol vectors of an associated group based on a decoded symbol vector to generate null- cancelled symbol vectors.
  • operation 608 may iteratively cancel interference from the symbol vectors in successive layers.
  • null canceller may null interference from symbol vectors 407 (FIG. 4) so that the i layer may still have interference from first to the i th -l layer, and may have substantially no interference from the i th +l layer to the M th layer, although the scope of the invention is not limited in this respect.
  • operation 608 may be performed by null cancellers, such as null cancellers 408 (FIG. 4).
  • Operation 610 comprises decoding layers of symbols of the associated group by multiplying a decoded output one layer at a time by a complex-field matrix to regenerate symbol vectors for performing the null canceling.
  • operation 610 may be performed by decoders, such as decoders 410 (FIG. 4). In some embodiments, operation 610 comprises spherically decoding to generate decoded QAM symbol vectors for each subcarrier of the multicarrier communication channel, although the scope of the invention is not limited in this respect.
  • Operation 612 comprises demapping the decoded symbol vectors for each group to generate a plurality of parallel sets of bits. Operation 612 may be performed by a symbol demapper, such as demapper 412 (FIG. 4). Operation 614 comprises generating a serial bit stream from the plurality of parallel sets of bits.
  • operation 614 may be performed by a parallel- to-serial converter, such as parallel-to-serial converter 414 (FIG. 4).
  • a parallel- to-serial converter such as parallel-to-serial converter 414 (FIG. 4).
  • FIG. 4 parallel-to-serial converter 414
  • FIG. 4 the individual operations of procedures 500 and 600 are illustrated and described as separate operations, one or more of the individual operations may be performed concurrently, and nothing requires that the operations be performed in the order illustrated.
  • Embodiments of the invention may be implemented in one or a combination of hardware, firmware and software.
  • Embodiments of the invention may also be implemented as instructions stored on a machine-readable medium, which may be read and executed by at least one processor to perform the operations described herein.
  • a machine-readable medium may include any mechanism for storing or transmitting information in a form readable by a machine (e.g., a computer).
  • a machine-readable medium may include read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices, electrical, optical, acoustical or other form of propagated signals (e.g., carrier waves, infrared signals, digital signals, etc.), and others.
  • ROM read-only memory
  • RAM random-access memory
  • magnetic disk storage media magnetic disk storage media
  • optical storage media flash-memory devices
  • electrical, optical, acoustical or other form of propagated signals e.g., carrier waves, infrared signals, digital signals, etc.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un émetteur multiporteuse qui utilise des codes de blocs à fréquence spatiale à haut débit afin de faire correspondre des symboles de transmission à une antenne de transmission particulière et à une sous-porteuse particulière d'un canal de communication multiporteuse.
EP04788700A 2003-09-15 2004-09-10 Systemes a antennes multiples et procedes utilisant des codes de blocs a frequence spatiale a haut debit Ceased EP1665616A2 (fr)

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US50309203P 2003-09-15 2003-09-15
US10/814,113 US7315577B2 (en) 2003-09-15 2004-03-30 Multiple antenna systems and method using high-throughput space-frequency block codes
PCT/US2004/029698 WO2005029758A2 (fr) 2003-09-15 2004-09-10 Systemes a antennes multiples et procedes utilisant des codes de blocs a frequence spatiale a haut debit

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WO2005029758A3 (fr) 2005-08-04
TWI264891B (en) 2006-10-21
TW200524330A (en) 2005-07-16
WO2005029758A2 (fr) 2005-03-31
JP4459960B2 (ja) 2010-04-28
JP2007506303A (ja) 2007-03-15

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