WO2008130143A1 - Procédé de transmission de signaux et appareil associé, procédé de réception de signaux et appareil associé - Google Patents

Procédé de transmission de signaux et appareil associé, procédé de réception de signaux et appareil associé Download PDF

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Publication number
WO2008130143A1
WO2008130143A1 PCT/KR2008/002187 KR2008002187W WO2008130143A1 WO 2008130143 A1 WO2008130143 A1 WO 2008130143A1 KR 2008002187 W KR2008002187 W KR 2008002187W WO 2008130143 A1 WO2008130143 A1 WO 2008130143A1
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WO
WIPO (PCT)
Prior art keywords
data
input
symbol
output
input data
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Application number
PCT/KR2008/002187
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English (en)
Inventor
Woo Suk Ko
Sang Chul Moon
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Lg Electronics Inc.
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Publication date
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Publication of WO2008130143A1 publication Critical patent/WO2008130143A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation

Definitions

  • the present invention relates to a signal transmission/reception method and a signal transmission/reception apparatus, and more particularly, to a signal transmission/ reception method and a signal transmission/reception apparatus which are robust to frequency- selective fading.
  • MIMO Multi Input Multi Output
  • a plurality of antennas can be used to obtain an array gain so as to improve an average SNR. Also, a diversity gain can be obtained when fading of a transmission channel from each transmission antenna to each reception antenna is independent.
  • the MIMO scheme is problematic in that, in terms of only one specific transmission channel, this channel cannot help being subject to frequency- selective fading resulting from a delay time thereof as ever. Disclosure of Invention
  • An object of the present invention devised to solve the problem lies on a signal transmission/reception method and a signal transmission/reception apparatus which are robust to frequency-selective fading.
  • the object of the present invention can be achieved by providing a signal transmission apparatus comprising a symbol mapper, a precoder, an interleaver, and a modulator.
  • the symbol mapper maps input data to symbol data based on a given transmission scheme.
  • the precoder precodes the mapped symbol data to disperse the mapped symbol data into two or more symbol data in a frequency domain.
  • the interleaver interleaves symbol data of an output data stream from the precoder according to a predetermined rule.
  • the modulator modulates the interleaved data such that the interleaved data can be transmitted on respective sub-carriers of an Orthogonal Frequency Division Multiplex (OFDM) scheme.
  • OFDM Orthogonal Frequency Division Multiplex
  • the precoder may comprise a serial/parallel converter for converting input serial data into parallel data, an encoder for multiplying the parallel data by a predetermined encoding matrix to disperse the parallel data, and a parallel/serial converter for converting the dispersed parallel data into serial data.
  • the signal transmission apparatus may further comprise a Multi Input Multi Output
  • MIMO MIMO-encoding the interleaved data such that the interleaved data can be transmitted through a plurality of antennas.
  • a signal transmission method comprising precoding symbol data mapped based on a given transmission scheme to disperse the mapped symbol data into two or more symbol data in a frequency domain, interleaving symbol data of a precoded data stream according to a predetermined rule, and modulating the interleaved data such that the interleaved data can be transmitted on respective sub-carriers of an OFDM scheme.
  • the signal transmission method may further comprise MIMO-encoding the interleaved data such that the interleaved data can be transmitted through a plurality of antennas.
  • a signal reception apparatus comprising a deinterleaver, a precoding decoder, and a symbol demapper.
  • the deinterleaver deinterleaves one symbol data stream received and demodulated, to restore an order of symbol data of the symbol data stream to an original one.
  • the precoding decoder restores symbol data dispersed in a frequency domain from the order-restored symbol data.
  • the symbol demapper demaps the restored symbol data to output bit data of a corresponding symbol.
  • the signal reception apparatus may further comprise a MIMO decoder for MIMO- decoding data demodulated after being received through a plurality of antennas, to output the one symbol data stream.
  • a signal reception method comprising deinterleaving one symbol data stream received and demodulated, to restore an order of symbol data of the symbol data stream to an original one, restoring symbol data dispersed in a frequency domain from the order-restored symbol data, and demapping the restored symbol data to output bit data of a corresponding symbol.
  • the signal reception method may further comprise MIMO-decoding data demodulated after being received through a plurality of antennas, to output the one symbol data stream.
  • input data can be dispersed and transmitted in a frequency domain, so that it can be robust to frequency-selective fading resulting from a delay time of each transmission channel. Also, it is possible to improve signal reception performance of a receiver.
  • FIG. 1 is a schematic block diagram of a signal transmission apparatus according to one embodiment of the present invention.
  • FIG. 2 is a schematic block diagram of a linear precoder according to one embodiment of the present invention.
  • FIG. 3 is a view showing a code matrix for dispersion of input data according to one embodiment of the present invention.
  • FIG. 4 is a view showing another code matrix for dispersion of input data according to one embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a signal transmission apparatus having a plurality of transmission paths according to one embodiment of the present invention.
  • FIGs. 6 to 10 are views showing examples of a 2x2 code matrix for dispersion of input symbols according to one embodiment of the present invention.
  • FIG. 11 is a view illustrating an example of an interleaver according to one embodiment of the present invention.
  • FIG. 12 is a view illustrating a detailed example of the interleaver of FIG. 11 according to one embodiment of the present invention.
  • FIG. 13 is a view illustrating an example of a MIMO encoding scheme according to one embodiment of the present invention.
  • FIG. 14 is a schematic block diagram of a signal reception apparatus according to one embodiment of the present invention.
  • FIG. 15 is a block diagram schematically showing an example of a linear precoding decoder according to one embodiment of the present invention.
  • FIG. 16 is a block diagram schematically showing another example of the linear precoding decoder according to one embodiment of the present invention.
  • FIG. 17 is a schematic block diagram of a signal reception apparatus having a plurality of reception paths according to one embodiment of the present invention.
  • FIGs. 18 to 22 are views showing examples of a 2x2 code matrix for restoration of dispersed symbols according to one embodiment of the present invention.
  • FIG. 23 is a schematic block diagram of another example of the signal transmission apparatus according to one embodiment of the present invention.
  • FIG. 24 is a schematic block diagram of another example of the signal reception apparatus according to one embodiment of the present invention.
  • FIG. 25 is a flowchart illustrating a signal transmission/reception method according to one embodiment of the present invention. Best Mode for Carrying Out the Invention
  • FIG. 1 is a schematic block diagram of a signal transmission apparatus according to one embodiment of the present invention.
  • the signal transmission apparatus employs a Multi Input Multi Output (MIMO) scheme for multiple input/ output.
  • MIMO Multi Input Multi Output
  • the signal transmission apparatus of FIG. 1 may be a broadcast signal transmission system that transmits video data of a broadcast signal.
  • the signal transmission apparatus of FIG. 1 may be a signal transmission system based on a digital video broadcasting (DVB) system.
  • the embodiment of FIG. 1 comprises an outer coder 100, outer interleaver 110, inner coder 120, inner interleaver 130, symbol mapper 140, linear precoder 150, interleaver 160, MIMO encoder 170, frame builder 180, modulator 190, and transmitting unit 195.
  • the embodiment of FIG. 1 will be described centering around a signal processing process of the signal transmission apparatus.
  • the outer coder 100 and the outer interleaver 110 code and interleave input data, respectively, to improve transmission performance of an input signal.
  • a Reed-Solomon coding scheme may be used for the outer coding and a convolution interleaving scheme may be used for the interleaving.
  • the inner coder 120 and the inner interleaver 130 again code and interleave a signal to be transmitted, respectively, to cope with occurrence of an error in the signal to be transmitted.
  • the inner coder 120 may employ a punctured convolution coding scheme to code the signal to be transmitted.
  • Employed as the inner interleaving scheme of the inner interleaver 130 may be a native or in-depth interleaving scheme based on memory operations in 2k, 4k and 8k transmission modes in, for example, the DVB-T system.
  • the types of the respective coders and interleavers may be different depending on coding and interleaving schemes used in the signal transmission apparatus.
  • the symbol mapper 140 maps the signal to be transmitted to symbol data based on a scheme such as 16QAM, 64QAM or QPSK in consideration of a pilot signal and transmission parameter signals based on a transmission mode.
  • the linear precoder 150 disperses symbol data inputted thereto into a plurality of output symbol data in a frequency domain to reduce the probability for all information to be lost due to fading when a frequency- selective fading channel is experienced.
  • FIG. 2 is a schematic block diagram of the linear precoder 150 according to one embodiment of the present invention.
  • the precoder 150 includes a serial/parallel converter 152, encoder 154, and parallel/serial converter 156.
  • the serial/parallel converter 152 converts input data into parallel data and outputs the converted parallel data to the encoder 154.
  • the encoder 154 disperses the parallel data inputted thereto into a plurality of data through encoding matrixing and outputs the resulting data to the parallel/serial converter 156.
  • FIG. 3 is a view showing a code matrix for dispersion of input data according to one embodiment of the present invention.
  • FIG. 3 shows an example of an encoding matrix for dispersing the input data into a plurality of output data, which is called a vanderMonde matrix.
  • the input data can be arranged in parallel by a length corresponding to the number L of output data.
  • ⁇ of the matrix can be expressed by the following equation 1, and may be defined in a different way.
  • the vanderMonde matrix can adjust the matrix components thereof using the equation 1.
  • the matrix reflects each input data in output data by rotating it by a corresponding phase of the equation 1. Thus, input values can be dispersed into at least two output values according to characteristics of the matrix.
  • L represents the number of output data.
  • FIG. 4 is a view showing another code matrix for dispersion of input data according to one embodiment of the present invention.
  • FIG. 4 shows an example of an encoding matrix for dispersing the input data into a plurality of output data, which is called a Hadamard matrix.
  • the output symbols of this matrix can be obtained from additions and subtractions of L input symbols. In other words, each input symbol can be dispersed into L output symbols.
  • the parallel/serial converter 156 again converts the data received from the encoder
  • the interleaver 160 again interleaves the symbol data outputted from the linear precoder 150 and outputs the interleaved data to the MIMO encoder 170. That is, the interleaver 160 performs interleaving with respect to the precoded symbol data such that the symbol data dispersed into the data outputted from the linear precoder 150 cannot be subject to the same frequency- selective fading.
  • a convolution interleaver, block interleaver or the like may be used as the interleaver 160.
  • the linear precoder 150 and the interleaver 160 are parts to process data to be transmitted such that the data can be robust to frequency-selective fading of a channel.
  • the MIMO encoder 170 performs MIMO encoding with respect to the data interleaved by the interleaver 160 such that the interleaved data can be transmitted on a plurality of transmission antennas, and outputs the resulting data to the frame builder 180.
  • the MIMO encoding may be broadly classified into a spatial multiplexing scheme and a spatial diversity scheme.
  • the spatial multiplexing scheme is a scheme where a transmitter and a receiver transmit different data simultaneously using multiple antennas, thereby enabling data to be transmitted at a higher speed with no further increase in system bandwidth.
  • the spatial diversity scheme is a scheme where data of the same information is transmitted through multiple transmission antennas to obtain transmission diversity.
  • a space-time block code (STBC), a space-frequency block code (SFBC), a space-time trellis code (STTC), etc can be used for the MIMO encoder 170 of the spatial diversity scheme.
  • a scheme for simply dividing and transmitting a data stream by the number of transmission antennas, a full-diversity full-rate (FDFR) code, a linear dispersion code (LDC), a Vertical-Bell Lab. layered space-time (V-BLAST), a diagonal-BLAST (D-BLAST), etc. can be used for the MIMO encoder 170 of the spatial multiplex scheme.
  • the frame builder 180 enables the precoded signal to be modulated based on an
  • the frame builder 180 inserts a pilot signal in a data period of the precoded signal to build a frame, and outputs the built frame to the modulator 190.
  • OFDM Orthogonal Frequency Division Multiplex
  • the modulator 190 inserts a guard interval in output data from the frame builder
  • the transmitting unit 195 converts a digital signal having the guard interval and the data period, outputted from the modulator 190, into an analog signal and transmits the converted analog signal.
  • FIG. 5 is a schematic block diagram of a signal transmission apparatus having a plurality of transmission paths according to one embodiment of the present invention.
  • the case where the number of transmission paths is two will hereinafter be taken as an example.
  • FIG. 5 comprises an outer coder 400, outer interleaver 410, inner coder 420, inner interleaver 430, symbol mapper 440, linear precoder 450, interleaver 460, MIMO encoder 470, first frame builder 480, second frame builder 485, first modulator 490, second modulator 491, first transmitting unit 495, and second transmitting unit 496.
  • a signal processing process from the outer coder 400 to the MIMO encoder 470 is the same as that described in FIG. 1.
  • the outer coder 400 and the outer interleaver 410 code and interleave code and interleave input data, respectively, to improve transmission performance of an input signal.
  • a Reed-Solomon coding scheme may be used for the outer coding and a convolution interleaving scheme may be used for the interleaving.
  • the inner coder 420 and the inner interleaver 430 again code and interleave a signal to be transmitted, respectively, to cope with occurrence of an error in the signal to be transmitted.
  • the inner coder 420 may employ a punctured convolution coding scheme to code the signal to be transmitted.
  • Employed as the inner interleaving scheme of the inner interleaver 430 may be a native or in-depth interleaving scheme based on memory operations in 2k, 4k and 8k transmission modes in, for example, the DVB-T system.
  • the symbol mapper 440 maps the signal to be transmitted to symbol data based on a scheme such as 16QAM, 64QAM or QPSK in consideration of a pilot signal and transmission parameter signals based on a transmission mode.
  • the linear precoder 450 includes a serial/parallel converter, encoder, and parallel/ serial converter.
  • FIGs. 6 to 10 are views showing examples of a 2x2 code matrix for dispersion of input symbols according to one embodiment of the present invention.
  • the code matrices of FIGs. 6 to 10 are applicable to the signal transmission apparatus as shown in FIG. 5, and disperse two data inputted to the encoder in the linear precoder 450 into two output data.
  • the matrix of FIG. 6 is an example of the vanderMonde matrix described in FIG. 3.
  • the matrix of FIG. 6 adds a first one of the two input data and a second one of the two input data rotated 45 degrees ( n
  • the matrix of FIG. 6 is an example of the Hadamard matrix described in FIG. 4.
  • the matrix of FIG. 7 adds a first one of the two input data and a second one of the two input data to provide first output data, and subtracts the second input data from the first input data to provide second output data. Then, the matrix of FIG. 7 scales each output data by dividing it by
  • FIG. 8 shows another example of the input symbol dispersion code matrix applicable to FIG. 5 according to one embodiment of the present invention.
  • the matrix of FIG. 8 is an example of another code matrix different from the matrices described in FIGs. 3 and 4.
  • the matrix of FIG. 8 adds a first one of the two input data rotated 45 degrees ( ⁇ 4 ) in phase and a second one of the two input data rotated -45 degrees ( ⁇
  • the matrix of FIG. 8 scales each output data by dividing it by
  • FIG. 9 shows another example of the input symbol dispersion code matrix applicable to FIG. 5 according to one embodiment of the present invention.
  • the matrix of FIG. 9 is an example of another code matrix different from the matrices described in FIGs. 3 and 4.
  • the matrix of FIG. 9 adds a first one of the two input data multiplied by 0.5 to a second one of the two input data to provide first output data, and subtracts the second input data multiplied by 0.5 from the first input data to provide second output data. Then, the matrix of FIG. 9 scales each output data by dividing it by
  • FIG. 10 shows another example of the input symbol dispersion code matrix applicable to FIG. 5 according to one embodiment of the present invention.
  • the matrix of FIG. 10 is an example of another code matrix different from the matrices described in FIGs. 3 and 4.
  • '*' means a complex conjugate of input data.
  • the matrix of FIG. 10 adds a first one of the two input data rotated 90 degrees (
  • the matrix of FIG. 10 scales each output data by dividing it by
  • the interleaver 460 again interleaves the symbol data outputted from the linear precoder 450.
  • a convolution interleaver, block interleaver or the like may be used as the interleaver 460.
  • the interleaver 460 acts to interleave the data outputted from the linear precoder 450 such that the symbol data dispersed into the data outputted from the linear precoder 150 cannot be subject to the same frequency- selective fading.
  • the type of the interleaver 460 may be different according to different embodiments of a transmission/reception system.
  • the length of the interleaver 460 may be different according to different embodiments. For example, when the length of the interleaver 460 is smaller than or equal to an OFDM symbol length, the interleaving is performed in only an area within one OFDM symbol. Conversely, when the length of the interleaver 460 is larger than the OFDM symbol length, the interleaving is performed over several symbols.
  • FIG. 11 is a view illustrating an example of the interleaver according to one embodiment of the present invention.
  • FIG. 11 illustrates an embodiment of an interleaver for an OFDM system having a length N, which is applicable as the interleaver 160 of FIG. 1 or the interleaver 460 of FIG. 5.
  • N represents a symbol length of the interleaver
  • i has a value corresponding to the length of the interleaver, namely, an integer value of 0 to N-I.
  • n is the number of effective carriers in a transmission system.
  • Il(i) represents a permutation based on a modulo-N operation, and d sequentially has Il(i) values existing in an effective carrier area, except an N/2 value.
  • k represents an index value of an actual carrier, which is obtained by subtracting N/2 from d such that a DC n component is present at the center of a transmission bandwidth.
  • P is a permutation constant, which may be different according to different embodiments.
  • FIG. 12 illustrates a detailed example of the interleaver of FIG. 11 according to one embodiment of the present invention.
  • each of the OFDM symbol length and interleaver length N is set to 2048, and the number of effective carriers is set to 1536 (1792 - 256).
  • i is an integer of 0 to 2047
  • n is an integer of 0 to 1535.
  • Il(i) is a permutation based on a modulo-2048 operation, and d n sequentially has Il(i) values, except 1024 (N/2), with respect to 256
  • k is a value obtained by subtracting 1024 from d n , and P is 13.
  • N of the interleaver can be interleaved and transmitted.
  • the interleaved data is outputted to the MIMO encoder 470.
  • the MIMO encoder 470 The MIMO encoder
  • the MIMO encoder 470 encodes and outputs symbol data inputted thereto such that the symbol data can be transmitted on a plurality of transmission antennas. For example, in the case where the number of transmission paths is two, the MIMO encoder 470 outputs the encoded symbol data to the first frame builder 480 and second frame builder 485.
  • the MIMO encoding scheme is a spatial diversity scheme
  • symbol data of the same information is outputted to the first frame builder 480 and second frame builder 485.
  • the MIMO encoding scheme is a spatial multiplexing scheme
  • different symbol data are outputted to the first frame builder 480 and second frame builder 485, respectively.
  • FIG. 13 is a view illustrating an example of the MIMO encoding scheme according to one embodiment of the present invention.
  • FIG. 13 illustrates an STBC, one of MIMO encoding schemes, which is applicable to the signal transmission apparatus as shown in FIG. 5.
  • This encoding scheme is nothing but one example, and the present invention is not limited thereto.
  • T represents a symbol transmission period
  • s represents an input symbol to be transmitted
  • y represents an output symbol.
  • '*' represents a complex conjugate
  • Tx #1 and Tx #2 represent transmission antennas 1 and 2, respectively.
  • Tx #1 and Tx #2 transmit s and s at a time t, respectively, and transmit -s * and s * at a time t+T, respectively.
  • the respective transmission antennas transmit data of the same information of s and s within the transmission o i period. Therefore, it can be seen that this encoding scheme is one of spatial diversity schemes.
  • Each of the first frame builder 480 and second frame builder 485 inserts a pilot signal in a data period of an input signal to build a frame, so that the input signal can be modulated based on an Orthogonal Frequency Division Multiplex (OFDM) scheme.
  • OFDM Orthogonal Frequency Division Multiplex
  • each frame, or OFDM frame includes 68
  • Each OFDM symbol includes 6817 carriers in an 8k mode and 1705 carriers in a 2k mode. Also, each OFDM frame includes a dispersed pilot signal, a consecutive pilot signal, and a transmission parameter signal (TPS) carrier.
  • TPS transmission parameter signal
  • the first modulator 490 and second modulator 491 modulate respective data outputted from the first frame builder 480 and second frame builder 485 such that the data can be transmitted on OFDM sub-carriers, respectively, and output the modulated data to the first transmitting unit 495 and second transmitting unit 496, respectively.
  • the first transmitting unit 495 and second transmitting unit 496 convert respective digital signals each having a guard interval and a data period, outputted from the first modulator 490 and second modulator 491, into analog signals and transmit the analog signals, respectively.
  • FIG. 14 is a schematic block diagram of a signal reception apparatus according to one embodiment of the present invention.
  • the embodiment of FIG. 14 may be included in a DVB reception apparatus, etc.
  • the embodiment of FIG. 14 comprises a receiving unit 900, synchronizer 910, demodulator 920, frame parser 930, MIMO decoder 940, deinterleaver 950, linear precoding decoder 960, symbol demapper 970, inner deinterleaver 980, inner decoder 990, outer deinterleaver 995, and outer decoder 997.
  • the embodiment of FIG. 14 will be described centering around a signal processing process of the signal reception apparatus under the condition that the number of reception paths is not fixed.
  • the receiving unit 900 down-converts a frequency band of a received radio frequency (RF) signal, converts the resulting analog signal into a digital signal and outputs the converted digital signal to the synchronizer 910.
  • the synchronizer 910 acquires frequency-domain and time-domain synchronizations of the received signal outputted from the receiving unit 900 and outputs the resulting signal to the demodulator 920.
  • the synchronizer 910 may use frequency-domain offset results of data outputted from the demodulator 920.
  • the demodulator 920 demodulates received data outputted from the synchronizer 910 and removes a guard interval from the demodulated data. To this end, the demodulator 920 converts the received data into data of a frequency domain, decodes data values dispersed to sub-carriers of the converted data into values allocated respectively to the sub-carriers and outputs the decoded values to the frame parser 930.
  • the frame parser 930 parses a frame structure of a signal demodulated by the demodulator 920 to extract, therefrom, symbol data in a data period except a pilot signal, and outputs the extracted data to the MIMO decoder 940.
  • the MIMO decoder 940 receives and decodes the symbol data in the data period outputted from the frame parser 930, and outputs the resulting one data stream to the deinterleaver 950.
  • the MIMO decoder 940 outputs one data stream by decoding the received data in a scheme corresponding to the encoding scheme of the MIMO encoder 170 of FIG. 1 which encodes data to be transmitted so that the data to be transmitted can be transmitted on a plurality of transmission antennas.
  • the deinterleaver 950 deinterleaves the data stream outputted from the MIMO decoder 940 to restore the order of the symbol data of the data stream to one before being interleaved, and outputs the order-restored symbol data to the linear precoding decoder 960.
  • the deinterleaver 950 restores the order of the data stream to the original one by deinterleaving the data stream in a scheme corresponding to the interleaving scheme of the interleaver 160 of FIG. 1.
  • the linear precoding decoder 960 restores the original data by performing an inverse process of the data dispersion process of the signal transmission apparatus and outputs the restored data to the symbol demapper 970.
  • FIG. 15 is a block diagram schematically showing an example of the linear precoding decoder 960 according to one embodiment of the present invention.
  • the linear precoding decoder 960 includes a serial/parallel converter 962, first decoder 964, and parallel/serial converter 966.
  • the serial/parallel converter 962 converts input data into parallel data and outputs the converted parallel data to the first decoder 964.
  • the first decoder 964 restores the original data from dispersed data by applying the parallel data to decoding matrixing, and outputs the restored data to the parallel/serial converter 966.
  • a decoding matrix for performing the decoding is an inverse matrix of the encoding matrix of the signal transmission apparatus. For example, in the case where the signal transmission apparatus performs the encoding using the vanderMonde matrix as shown in FIG. 3, the first decoder 964 restores the dispersed data to the original data using an inverse matrix of the vanderMonde matrix.
  • FIG. 16 is a block diagram schematically showing another example of the linear precoding decoder 960 according to one embodiment of the present invention.
  • the linear precoding decoder 960 includes a serial/parallel converter 961, second decoder 963, and parallel/serial converter 965.
  • the serial/parallel converter 961 converts input data into parallel data, and the parallel/serial converter 965 again converts parallel data received from the second decoder 963 into serial data.
  • the second decoder 963 restores the original data dispersed into parallel data outputted from the serial/parallel converter 961 using Maximum Likelihood (ML) decoding.
  • ML Maximum Likelihood
  • the second decoder 963 may be an ML decoder considering a transmission scheme of a transmitter.
  • the second decoder 963 restores the original data dispersed into received symbol data by ML-decoding the received symbol data correspondingly to the transmission scheme. That is, the ML decoder ML-decodes the received symbol data in consideration of an encoding rule of a transmitting stage.
  • the symbol demapper 970 restores the symbol data decoded by the linear precoding decoder 960 to a bit stream and outputs the restored bit stream to the inner dein- terleaver 980.
  • the inner deinterleaver 980 performs an inverse process of the interleaving with respect to an interleaved data stream and outputs the deinterleaved data to the inner decoder 990.
  • the inner decoder 990 decodes the deinterleaved data to correct an error included in the deinterleaved data, and outputs the decoded data to the outer deinterleaver 995.
  • the outer deinterleaver 995 and the outer decoder 997 again perform the deinterleaving process and the error correction decoding process with respect to input data, respectively.
  • FIG. 17 is a schematic block diagram of a signal reception apparatus having a plurality of reception paths according to one embodiment of the present invention.
  • the case where the number of reception paths is two will hereinafter be taken as an example.
  • FIG. 17 comprises a first receiving unit 1100, second receiving unit 1105, first synchronizer 1110, second synchronizer 1115, first demodulator 1120, second demodulator 1125, first frame parser 1130, second frame parser 1135, MIMO decoder 1140, deinterleaver 1150, linear precoding decoder 1160, symbol demapper 1170, inner deinterleaver 1180, inner decoder 1190, outer deinterleaver 1195, and outer decoder 1197.
  • the first receiving unit 1100 receives an RF signal, down-converts a frequency band of the received RF signal, converts the resulting analog signal into a digital signal and outputs the converted digital signal to the first synchronizer 1110.
  • the second receiving unit 1105 receives an RF signal, down-converts a frequency band of the received RF signal, converts the resulting analog signal into a digital signal and outputs the converted digital signal to the second synchronizer 1115.
  • the first synchronizer 1110 acquires frequency-domain and time-domain synchronizations of the received signal outputted from the first receiving unit 1100 and outputs the resulting signal to the first demodulator 1120.
  • the second synchronizer 1115 acquires frequency-domain and time-domain synchronizations of the received signal outputted from the second receiving unit 1105 and outputs the resulting signal to the second demodulator 1125.
  • the first synchronizer 1110 and the second synchronizer 1115 may use frequency-domain offset results of data outputted from the first demodulator 1120 and second demodulator 1125, respectively.
  • the first demodulator 1120 demodulates received data outputted from the first synchronizer 1110 and outputs the demodulated data to the first frame parser 1130. To this end, the first demodulator 1120 converts the received data into data of a frequency domain and decodes data values dispersed to sub-carriers of the converted data into values allocated respectively to the sub-carriers.
  • the second demodulator 1125 demodulates received data outputted from the second synchronizer 1115 and outputs the demodulated data to the second frame parser 1135. Similarly, the second demodulator 1125 converts the received data into data of the frequency domain and decodes data values dispersed to sub-carriers of the converted data into values allocated respectively to the sub-carriers.
  • the first frame parser 1130 parses a frame structure of a signal demodulated by the first demodulator 1120 to extract, therefrom, symbol data in a data period except a pilot signal, and outputs the extracted data to the MIMO decoder 1140.
  • the second frame parser 1135 parses a frame structure of a signal demodulated by the second demodulator 1125 to extract, therefrom, symbol data in a data period except a pilot signal, and outputs the extracted data to the MIMO decoder 1140.
  • the MIMO decoder 1140 receives and decodes the symbol data in the data periods outputted respectively from the first frame parser 1130 and second frame parser 1135, and outputs the resulting one data stream to the deinterleaver 1150.
  • the deinterleaver 1150 deinterleaves the data stream outputted from the
  • MIMO decoder 1140 to restore the order of the symbol data of the data stream to one before being interleaved, and outputs the order-restored symbol data to the linear precoding decoder 1160.
  • the deinterleaver 1150 restores the order of the data stream to the original one by performing an inverse process of the interleaving process.
  • the linear precoding decoder 1160 includes a serial/parallel converter, a first decoder (or second decoder), and a parallel/serial converter.
  • FIGs. 18 to 22 are views showing examples of a 2x2 code matrix for restoration of dispersed symbols according to one embodiment of the present invention. The code matrices of FIGs. 18 to 22 are applicable to the signal reception apparatus as shown in
  • FIG. 17 restore and output data dispersed into two data inputted to the decoder of the linear precoding decoder 1160.
  • the matrix of FIG. 18 is an example of a vanderMonde inverse matrix, which is a decoding matrix corresponding to the encoding matrix of FIG. 6.
  • the matrix of FIG. 18 adds a first one of the two input data and a second one of the two input data to provide first output data, and adds the first input data rotated -45 degrees ( ⁇
  • the matrix of FIG. 18 scales each output data by dividing it by
  • the matrix of FIG. 19 is an example of a Hadamard inverse matrix, which is a decoding matrix corresponding to the encoding matrix of FIG. 7.
  • the matrix of FIG. 19 adds a first one of the two input data and a second one of the two input data to provide first output data, and subtracts the second input data from the first input data to provide second output data. Then, the matrix of FIG. 19 scales each output data by dividing it by
  • FIG. 20 shows another example of the dispersed data restoration code matrix applicable to FIG. 17 according to one embodiment of the present invention.
  • the matrix of FIG. 20 is a decoding matrix corresponding to the encoding matrix of FIG. 8.
  • the matrix of FIG. 20 scales each output data by dividing it by
  • FIG. 21 shows another example of the dispersed data restoration code matrix applicable to FIG. 17 according to one embodiment of the present invention.
  • the matrix of FIG. 21 is a decoding matrix corresponding to the encoding matrix of FIG. 9.
  • the matrix of FIG. 21 adds a first one of the two input data multiplied by 0.5 to a second one of the two input data to provide first output data, and subtracts the second input data multiplied by 0.5 from the first input data to provide second output data. Then, the matrix of FIG. 21 scales each output data by dividing it by
  • FIG. 22 shows another example of the dispersed data restoration code matrix applicable to FIG. 17 according to one embodiment of the present invention.
  • the matrix of FIG. 22 is a decoding matrix corresponding to the encoding matrix of FIG. 10.
  • '*' means a complex conjugate of input data.
  • the matrix of FIG. 22 scales each output data by dividing it by
  • FIG. 23 is a schematic block diagram of another example of the signal transmission apparatus according to one embodiment of the present invention
  • FIG. 24 is a schematic block diagram of another example of the signal reception apparatus according to one embodiment of the present invention.
  • FIGs. 23 and 24 show examples applied to systems of a Single Input Single Output
  • SISO SISO
  • the signal transmission apparatus of FIG. 23 comprises an outer coder 1300, outer interleaver 1310, inner coder 1320, inner interleaver 1330, symbol mapper 1340, linear precoder 1350, interleaver 1360, frame builder 1370, modulator 1380, and transmitting unit 1390.
  • the signal reception apparatus of FIG. 24 comprises a receiving unit 1400, synchronizer 1410, demodulator 1420, frame parser 1430, deinterleaver 1440, linear precoding decoder 1450, symbol demapper 1460, inner deinterleaver 1470, inner decoder 1480, outer deinterleaver 1490, and outer decoder 1495.
  • the signal transmission apparatus and the signal reception apparatus of FIGs. 23 and 24 perform the same processing processes as those described in FIGs. 1 and 14, respectively, with exception of the MIMO encoding and the MIMO decoding in that they employ the SISO scheme, not the MIMO scheme.
  • symbol data is inputted to the frame builder 1370, which then builds and outputs frame data based on the inputted symbol data.
  • symbol data parsed by the frame parser 1430 is provided to the deinterleaver 1440, so that it is subjected to an inverse process of the processing process of the signal transmission apparatus performed to enable symbol data to be robust to the frequency- selective fading of the channel.
  • FIG. 25 is a flowchart illustrating a signal transmission/reception method according to one embodiment of the present invention.
  • a signal transmission apparatus precodes mapped symbol data to disperse the mapped symbol data into a plurality of output symbol data in a frequency domain (S 1500). Therefore, it is possible to reduce the probability for all information to be lost due to fading when a frequency-selective fading channel is experienced.
  • the signal transmission apparatus interleaves the precoded symbol data such that the symbol data dispersed into the output symbol data cannot be subject to the same frequency- selective fading (S 1510).
  • a convolution interleaver, block interleaver or the like may be used for this interleaving and selected according to a given embodiment.
  • the precoding to disperse the symbol data in the frequency domain and the interleaving are steps of processing data to be transmitted such that the data to be transmitted can be robust to frequency- selective fading of a channel.
  • the signal transmission apparatus MIMO-encodes the interleaved symbol data such that the interleaved symbol data can be transmitted through a plurality of antennas (S 1520).
  • the number of the antennas may be the number of available data transmission paths.
  • the MIMO encoding scheme is a spatial diversity scheme
  • data of the same information is transmitted along the respective paths.
  • the MIMO encoding scheme is a spatial multiplexing scheme
  • different data are transmitted along the respective paths.
  • the signal transmission apparatus builds data frames, for example, OFDM frames, based on the encoded data according to the number of the MIMO transmission paths, and modulates and transmits the built frames (S1530).
  • data frames for example, OFDM frames
  • a signal reception apparatus receives transmitted signals using a plurality of reception antennas and demodulates the received signals into data frames, respectively (S 1540).
  • the signal reception apparatus parses the demodulated data frames and decodes the parsed data frames in a scheme corresponding to the MIMO encoding scheme to obtain one symbol data stream (S 1550).
  • the signal reception apparatus deinterleaves the decoded symbol data stream in the reverse of the interleaving scheme of the signal transmission apparatus to restore the order of the data stream to the original one (S 1560). Then, the signal reception apparatus decodes the data stream, order-restored at the deinterleaving step, in the reverse of the precoding scheme of the signal transmission apparatus to restore the original symbol data dispersed into the plurality of symbol data in the frequency domain (S 1570).
  • the MIMO encoding step S 1520 and the MIMO decoding step S 1550 are not performed.
  • the above-described signal transmission/reception method and signal transmission/ reception apparatus are not limited to the above-stated embodiments, and are applicable to all signal transmission/reception systems including a broadcasting or communication system.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Error Detection And Correction (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé de transmission/réception de signaux et un appareil de transmission/réception de signaux. Le procédé de transmission de signaux fait appel à la dispersion des données de symbole mappées en fonction d'un système de transmission donné dans un domaine fréquentiel, à l'entrelacement des données dispersées, et au codage MIMO des données entrelacées de sorte que les données entrelacées puissent être transmises sur des voies multiples. Par conséquent, des données d'entrée peuvent être dispersées dans le domaine fréquentiel, de sorte qu'elles peuvent être robustes à l'évanouissement sélectif en fréquence résultant d'un temps de retard de chaque voie de transmission. Il est également possible d'améliorer les performances de réception de signaux d'un appareil de réception de signaux.
PCT/KR2008/002187 2007-04-19 2008-04-18 Procédé de transmission de signaux et appareil associé, procédé de réception de signaux et appareil associé WO2008130143A1 (fr)

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KR10-2007-0038303 2007-04-19
KR1020070038303A KR20080094189A (ko) 2007-04-19 2007-04-19 신호 송수신 방법 및 신호 송수신 장치

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003084092A2 (fr) * 2002-03-27 2003-10-09 Qualcomm, Incorporated Precodage de canal multivoie dans un systeme mimo
WO2005043788A2 (fr) * 2003-10-31 2005-05-12 Nokia Corporation Constellations partiellement coherentes a antennes multiples pour des systemes a porteuses multiples
US7190734B2 (en) * 2001-05-25 2007-03-13 Regents Of The University Of Minnesota Space-time coded transmissions within a wireless communication network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7190734B2 (en) * 2001-05-25 2007-03-13 Regents Of The University Of Minnesota Space-time coded transmissions within a wireless communication network
WO2003084092A2 (fr) * 2002-03-27 2003-10-09 Qualcomm, Incorporated Precodage de canal multivoie dans un systeme mimo
WO2005043788A2 (fr) * 2003-10-31 2005-05-12 Nokia Corporation Constellations partiellement coherentes a antennes multiples pour des systemes a porteuses multiples

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GUILLAUD M. ET AL.: "Multi-stream coding for MIMO OFDM systems with space-time-frequency spreading", THE 5TH INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS, vol. 1, 27 October 2002 (2002-10-27) - 30 October 2002 (2002-10-30), pages 120 - 124, XP010619060 *

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