EP2286531A2 - Appareil d'émission et de réception de signal et procédé associé - Google Patents

Appareil d'émission et de réception de signal et procédé associé

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Publication number
EP2286531A2
EP2286531A2 EP09755014A EP09755014A EP2286531A2 EP 2286531 A2 EP2286531 A2 EP 2286531A2 EP 09755014 A EP09755014 A EP 09755014A EP 09755014 A EP09755014 A EP 09755014A EP 2286531 A2 EP2286531 A2 EP 2286531A2
Authority
EP
European Patent Office
Prior art keywords
symbol
data
mimo
signals
demapped
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.)
Withdrawn
Application number
EP09755014A
Other languages
German (de)
English (en)
Other versions
EP2286531A4 (fr
Inventor
Sang Chul Moon
Woo Suk Ko
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP2286531A2 publication Critical patent/EP2286531A2/fr
Publication of EP2286531A4 publication Critical patent/EP2286531A4/fr
Withdrawn legal-status Critical Current

Links

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]
    • H04N21/40—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
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
    • 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
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to an apparatus for transmitting and receiving a signal and a method thereof that may enhance data transmission efficiency.
  • MIMO multi-input multi-output
  • Wibro wireless broadband
  • 3GPP 3rd generation partnership project
  • the MIMO technology broadlyconsists of spatial diversity, which reduces the transmission error rateso as to enhance the transmission efficiency, and spatial multiplexing, which transmits different data types from multiple antennas so as to enhance the transmission rate. It is also highly likely that the above-described MIMO technology will be adopted as the transmission method for the next generation digital broadcasting.
  • An object of the present invention devised to solve the problem lies on proposing an apparatus and method for transmitting and receiving signals that can enhance data transmission efficiency.
  • An object of the present invention devised to solve the problem lies on proposing an apparatus and method for transmitting and receiving signals that can enhance transmission efficiency of digital broadcast data by using the MIMO technology.
  • a further object of the present invention devised to solve the problem lies on proposing an apparatus and method for transmitting and receiving signals that can enhance transmission efficiency of digital broadcast data even in a channel condition unsuitable for the MIMO technology.
  • devices for transmitting and receiving a signal in claims 6 and 8 are disclosed.
  • the plurality of symbol mappers (330a, 330b) is further configured to symbol-map the demultiplexed bits in accordance with different symbol mapping methods.
  • the present invention is advantageous in that by using the MIMO technology the transmission efficiency of digital broadcast data may be enhanced, and that a signal transmission robust against errors may be provided. Furthermore, the digital broadcast data can be transmitted or received by using the MIMO technology even in a channel condition unsuitable for the MIMO technology.
  • FIG. 1 illustrates an exemplary transmitting system adopting the MIMO technology.
  • FIG. 2 illustrates an apparatus for receiving a signal according to an embodiment of the present invention.
  • FIG. 3 illustrates an apparatus for transmitting a signal according to another embodiment of the present invention.
  • FIG. 4 illustrates an apparatus for receiving a signal according to another embodiment of the present invention.
  • FIG. 5 illustrates an exemplary constellation based upon an antenna path.
  • FIG. 6 illustrates an exemplary constellation of received signals, when a channel correlation between each of the antenna paths is high.
  • FIG. 7 illustrates a method for transmitting a signal according to an embodiment of the present invention.
  • FIG. 8 illustrates a method for receiving a signal according to an embodiment of the present invention.
  • MIMO multi-input multi-output
  • the performance of a system adopting the MIMO technology relies on the characteristics of a transmission channel. Most particularly, the efficiency is more enhanced in systems having independent channel environments. In other words, if each of the channels from the transmitting end to the receiving end is independent from one another without having any correlation between one another, the performance of the system adopting the MIMO technology becomes greater. In a channel environment having a high cross-correlation between the transmission channels, such as a line-of-sight (LOS) environment, the performance of the system adopting the MIMO technology may show a sudden drop, or the system itself may fail to operate.
  • LOS line-of-sight
  • a two-way communication between a transmitting base station and a user terminal may be available.
  • the transmitting base station or the user terminal consistently monitors channel status with respect to a down-link from the base station to the user terminal and an up-link from the user terminal to the base station.
  • the base station may transmit the information without adopting the MIMO technology.
  • the signal transmission technology cannot be adaptively modified based upon the channel monitoring result.
  • FIG. 1 illustrates an exemplary transmitting system adopting the MIMO technology.
  • the disclosed embodiment of the transmitting system includes anerror correction encoding unit 110, a symbol mapper 120, an MIMO encoder 130, a first frame mapper 140a, a second frame mapper 140b, a first modulator 150a, and a second modulator 150b.
  • the error correction encoding unit 110 may error correction encode the data that are to be transmitted in appropriate units.
  • the error correction encoding unit 110 adds redundancy data so that the data that are to be transmitted can become robust against errors and, then, performs the error correction encoding process.
  • the symbol mapper 120 maps the error correction encoded data to symbols.
  • the error correction encoded bit data may be mapped into symbols based upon a specific symbol-mapping method, such as quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM), and pulse amplitude modulation (PAM).
  • QPSK quadrature phase shift keying
  • QAM quadrature amplitude modulation
  • PAM pulse amplitude modulation
  • the MIMO encoder 130 distributes the mapped symbols to multiple antenna paths by using the MIMO technique.
  • the MIMO encoder 130 distributes the inputted symbols to multiple transmission streams, so that the inputted symbols can be transmitted to each antenna path.
  • the MIMO encoder 130 enables the data to be transmitted to two antenna paths.
  • the first frame mapper 140a and the second frame mapper 140b may map each transmission stream, which is to be transmitted to the respective antenna path, to a signal frame.
  • the structure of the signal frame may vary depending upon the system to which the signal frame is to be transmitted. Therefore, an example of a specific signal frame structure will not be given herein.
  • the signal frame may be transmitted by being allocated to a single carrier or multiple carriers.
  • an example of transmitting the signal frame by allocating the signal frame to multiple carriers will be described.
  • the first modulator 150a and the second modulator 150b respectively modulate the signal frame by using orthogonal frequency divisional modulation (OFDM). Thereafter, the first modulator 150a and the second modulator 150b may respectively transmit the modulated signal through each antenna.
  • OFDM orthogonal frequency divisional modulation
  • FIG. 2 illustrates an apparatus for receiving a signal according to an embodiment of the present invention.
  • the apparatus for receiving a signal according to the embodiment of the present invention includes a first synchronization unit (Sync) 210a, a second synchronization unit (Sync) 210b,a first demodulator 220a, a second demodulator 220b, a first frame parser 230a, a second frame parser 230b, a MIMO decoder 240, a symbol demapper 250, and an error correction decoding unit 260.
  • the apparatus for receiving a signal according to the embodiment of the present invention may receive signals from multiple antennas based upon the MIMO technique. This embodiment shows an example of receiving the signals through two antennas so that the signal transmitted from the embodiment of the FIG. 1 can be received.
  • the first synchronization unit (Sync) 210a and the second synchronization unit (Sync) 210b respectively acquire synchronization from the signal received through each antenna.
  • the first synchronization unit 210a and the second synchronization unit 210b may respectively acquire and output time synchronization and frequency synchronization of the received signal.
  • the first demodulator 220a and the second demodulator 220b respectively perform demodulation of the synchronized signal.
  • the demodulation method may be in accordance with the modulation method.
  • the demodulation process may be performed by using the OFDM method with respect to the embodiment shown in FIG. 1.
  • the first demodulator 220a and the second demodulator 220b may respectively equalize the channels of the signals received through two antenna paths.
  • the first frame parser 230a and the second frame parser 230b respectively parse the frames of the signals equalized through the corresponding antenna paths.
  • the MIMO decoder 240 performs MIMO decoding on the signals parsed by the first frame parser 230a and the second frame parser 230b, respectively.
  • the MIMO decoder 240 may output a symbol sequence as a result of the decoding
  • the symbol demapper 250 symbol demaps the symbols included in the receiving stream into a bit stream by using the symbol demapping method.
  • the error correction decoding unit 260 error correction decodes the demapped bit stream, thereby acquiring the transmitted data.
  • Each of the signals transmitted from multiple antennas of the apparatus for transmitting a signal to multiple antennas of the apparatus for receiving a signal may go through completely different channels or may be transmitted through the same or similar channels. If the signals transmitted to multiple channels using the MIMO techniquego through the same or almost identical channels, the correlation between each channel may become very high, thereby causing the apparatus for receiving a signal to be unable to separate the received signals. For example, signals that are transmitted through channels having high correlation between one another may not be processed with MIMO decoding by the MIMO decoder of the apparatus for receiving a signal. Therefore, even if the MIMO technique is adopted in order to enhance the data transmission efficiency, the performance of the apparatus may drastically become deficient depending upon the receiving environment.
  • an example of the apparatus for receiving a signal adaptively acquiring the corresponding signal, even if the channel status is as described above, will be disclosed as follows.
  • FIG. 3 illustratesan apparatus for transmitting a signal according to another embodiment of the present invention.
  • the disclosed apparatus for transmitting a signal according to this embodiment includes an error correction encoding unit 310, a demultiplexer 320, a first symbol mapper 330a, a second symbol mapper 330b, a MIMO encoder 340, a first frame mapper 350a, a second frame mapper 350b, a first modulator 360a, and a second modulator 360b.
  • the error correction encoding unit 310 performs error correction encoding on the data that are to be transmitted in accordance with a specific error correction encoding method.
  • the demultiplexer 320 divides the error correction encoded data into streams so that each data stream can be outputted to a respective antenna path. For example, the demultiplexer 320 may demultiplex the data into a most significant bit (MSB) and a least significant bit (LSB) of data bits that are to be symbol-mapped to the first symbol mapper 330a and the second symbol mapper 330b.
  • MSB most significant bit
  • LSB least significant bit
  • the first symbol mapper 330a and the second symbol mapper 330b maps the streams that are to be transmitted to transmission antenna paths into symbols.
  • the first symbol mapper 330a and the second symbol mapper 330b may also map bit streams that are to be transmitted to different constellations into symbols.
  • the first symbol mapper 330a may map the MSB
  • the second symbol mapper 330b may map the LSB.
  • the symbol-mapping method for each of the first symbol mapper 330a and the second symbol mapper 330b may be different from one another.
  • the first symbol mapper 330a may perform symbol-mapping according to a 64QAM method
  • the second symbol mapper 330b may perform symbol-mapping according to a QPSK method.
  • a detailed example will be presented with reference to FIG. 5.
  • the first symbol mapper 330a maps a data size of M bps/Hz
  • the second symbol mapper 330b maps a data size of N bps/Hz.
  • the MIMO encoder 340 receives the hierarchically symbol-mapped symbols as described above and, then, MIMO encodes the received symbols so that the received symbols are transmitted to respective antenna paths. For example, the MIMO encoder 340 distributes the symbols received by using a specific MIMO encoding method to the respective antenna paths, so that the antenna can perform transmission at an equal power.
  • the first frame mapper 350a and the second frame mapper 350b respectively configure respective signal frames that are to be transmitted to the respective antennas.
  • first modulator 360a and the second modulator 360b respectively modulate the signal frames by using an orthogonal frequency divisional modulation (OFDM) method, thereby being able to transmitted the modulated signals to the respective antennas.
  • OFDM orthogonal frequency divisional modulation
  • FIG. 4 illustrates an apparatus for receiving a signal according to another embodiment of the present invention.
  • the apparatus for receiving a signal according to this embodiment of the present invention includes a first synchronization unit (Sync) 410a, a second synchronization unit (Sync) 410b, a first demodulator 420a, a second demodulator 420b, a first frame parser 430a, a second frame parser 430b, a MIMO decoder 440, a first symbol demapper 450a, a second symbol demapper 450b, a third symbol demapper 460, a multiplexer 470, a data merger 480, and an error correction decoding unit 490.
  • Sync synchronization unit
  • Sync second synchronization unit
  • the disclosed apparatus for receiving a signal uses the MIMO technique so as to divide the signals received through multiple antennas into hierarchically symbol-mapped symbols based upon the corresponding channel condition.
  • This embodiment shows an example of receiving signals transmitted through two antennas according to the embodiment shown in FIG. 3.
  • the first synchronization unit (Sync) 410a and the second synchronization unit (Sync) 410b acquire synchronization in the time and frequency domains of the signals received from the respective antennas.
  • the first demodulator 420a and the second demodulator 420 brespectively perform demodulation using the OFDM method on the synchronization-acquired signals. Also, channel equalization may be performed on the signals received through two antenna paths. During the channel-equalization process, the first demodulator 420a and the second demodulator 420b may respectively obtain channel information required for acquiring correlation between the channels through the antenna paths. For example, the first demodulator 420a and the second demodulator 420b may calculate (or compute) channel information from the signals through each of the two antenna paths by using a pilot signals.
  • the first frame parser 430a and the second frame parser 430b respectively parse signal frames from the signals equalized with respect to the two antenna paths.
  • the MIMO decoder 440 calculates channel correlation by using the channel information and performs MIMO decoding of the signals included in the parsed signal frames based upon the calculated channel correlation.
  • the channel correlation information may be identified (or distinguished) based upon a predetermined reference standard by using the channel information obtained from each channel. However, this may vary depending upon the setting made by the system designer. Therefore, a detailed embodiment will not be disclosed in the description of the present invention.For example, when the MIMO decoder 440 determines that the channel correlation is low based upon the predetermined standard, the MIMO decoder 440 performs MIMO decoding on the signals transmitted from each antenna path. More specifically, when the MIMO Decoder 440 performs MIMO decoding, the inter-mixed signals may be separated from one another, thereby being outputted.
  • the MIMO decoder 440 determines that the channel correlation is high, the signals transmitted through each antenna path may be outputted as a single signal without being separated.
  • the process of performing MIMO decoding based upon the channel information in accordance with the above-described channel correlation will be referred to as a hierarchical MIMO technique.
  • the MIMO decoder 440 may output a control signal, which can decide whether or not hierarchical demodulation is to be applied in accordance with the channel correlation calculated based upon the channel information.
  • the first symbol demapper 450a,the second symbol demapper 450b, and the third symbol demapper 460 respectively symbol-demap the hierarchical demodulation performed on the signals separated by the MIMO decoder 440 based upon the outputted control signalor performs symbol-demapping by using a single demodulation method.
  • each of the first symbol demapper 450a and the second symbol demapper 450b receives the symbol separated and outputted by the MIMO decoder 440, and then each of the first symbol demapper 450a and the second symbol demapper 450b symbol-demaps the received symbol in accordance with each of the symbol-mapping methods.
  • the second symbol demapper 450b symbol-demaps the received symbol by using the QPSK method when the symbols symbol-mapped based upon the hierarchical modulation shown in the example of FIG. 3 are separated.
  • the first symbol demapper 450a and the second symbol demapper 450b can respectively receive the symbols separated by the MIMO decoder 440, the first symbol demapper 450a and the second symbol demapper 450b may each perform a symbol-demapping process, thereby outputting the bit stream corresponding to the MSB and the LSB of the receiving data.
  • the MIMO decoder 440 when the channel correlation is high, the MIMO decoder 440 is unable to separate the signals transmitted through the antenna paths by using the MIMO technique. In this case, the MIMO decoder 440 may use a combined signal consisting of each of the received signals so as to perform symbol-demapping.
  • the third symbol demapper 460 performs symbol-demapping on the symbol of the signal consisting of a combination of the signals transmitted through the antenna paths.
  • the third symbol demapper 460 when a 64QAM symbol is received through the first antenna path, and when a QPSK symbol is received through the second antenna path, and when the two symbols cannot be separated, the symbols look like a symbol mapped based upon a 256QAM symbol-mapping method. Therefore, the third symbol demapper 460 performs symbol-demapping on the 256QAM symbol.
  • the multiplexer 470 may multiplex bit streams respectively symbol-demapped by the first symbol demapper 450a and the second symbol demapper 450b.
  • the first symbol demapper 450a outputs the data corresponding to the MSB
  • the second symbol demapper 450b outputs the data corresponding to the LSB.
  • the symbol-demapping result may be multiplexed so that a single bit stream information (for example, a LLR value) is outputted.
  • the data merger 480 receives channel information from the MIMO decoder 440 based upon the channel correlation. Then, the data merger 480 selectively outputs the bits stream outputted from the multiplexer 470 or the third symbol demapper 460based upon the received channel information. Alternatively, the data merger 480 determines the bits stream using the output fromthe multiplexer 470 and the output from the third symbol demapper 460, and outputs the determined bits stream.
  • the MIMO decoder 440 outputs the channel information based upon the channel correlation between antenna pathsas the control signal, thereby being capable of controlling the symbol-demapping operations of the first symbol demapper 450a, the second symbol demapper 450b, and the third symbol demapper 460 and the operations of the data merger 480.
  • the error correction decoding unit 490 performs error correction decoding on the bit stream outputted from the data merger 480. Accordingly, the error correction decoding unit 490 may adaptively decode data based upon the channel corresponding of the multiple antenna paths by using the MIMO technique. Alternatively, even when the channel correlation is high, the data may be received by using the MIMO technique.
  • FIG. 5 illustrates an exemplary constellation based upon an antenna path.
  • the constellation is configured so that the MSB symbol can have a larger symbol interval.
  • ⁇ shows the symbol-mapping of the MSB
  • ⁇ shows the symbol-mapping of the LSB.
  • the MSB is symbol-mapped by using the 64QAM method
  • the LSB is symbol-mapped by using the QPSK method. Since the symbols marked as ⁇ are transmitted and received in a data size of 2bps/Hz, and since the symbols marked as ⁇ are transmitted and received in a data size of 6bps/Hz, the total data size of the transmitted and received data becomes 8bps/Hz.
  • the MIMO decoder 440 may respectively output the symbols mapped in the same constellation shown in FIG. 5 to the first symbol demapper 450a and the second symbol demapper 450b. More specifically, when the channel correlation between the two antenna paths is low, and when the MIMO decoder 440 performs MIMO decoding, the MIMO decoder 440 may separate the symbols marked as ⁇ from the symbols marked as ⁇ . Accordingly, each of the first symbol demapper 450a and the second symbol demapper 450b may perform symbol-demapping based upon the mapping method of each of the received symbols.
  • FIG. 6 illustrates an exemplary constellation of received signals, when a channel correlation between each of the antenna paths is high.
  • the MIMO decoder 440 obtains symbols of a combination signal consisting of a combination of the signals received through respective antenna paths, as shown in FIG. 6.
  • the symbols cannot be separated.
  • the symbol of the combination signal consisting of a combination of two-different symbol-mapped signals looks like a 256QAM symbol in a receiver. More specifically, since the third symbol mapper 460 can receive a symbol based upon the 256QAM method, the third symbol mapper 460 may perform symbol-demapping on the symbol by using the 256QAM method.
  • symbol-demapping may be performed by using a likelihood ration (LLR) (in this example, the LLR corresponding to 256QAM), which is used in the symbol-demapping method corresponding to the symbol consisting of a combination of signals outputted from each antenna path.
  • LLR likelihood ration
  • the received data size corresponds to 8bps/Hz, which, in case the channel can be separated, is equivalent to the sum of the data sizes 2bps/Hz and 6bps/Hz being transmitted through each of the antenna paths.
  • the MIMO decoder 440 may obtain the channel correlation by using the channel status acquired from each of the first demodulator 420a and the second demodulator 420b. The MIMO decoder 440 may then output the channel information based upon the obtained channel correlation as the control information, thereby being capable of controlling the symbol-demapping operations of the first symbol demapper 450a, the second symbol demapper 450b, and the third symbol demapper 460 and the operations of the data merger 480.
  • the data merger 480 uses the control information in order to output bit data as the symbol-demapping result of the signals outputted from each antenna path. Accordingly, even when the signals respective to each antenna path cannot be separated, the hierarchical modulation method may be used to acquired the signal transmitted through each antenna path.
  • the data size (bps/Hz) being transmitted to each antenna path may be divided from the MSB to the LSB so as to be separately transmitted, thereby enabling a receiver to receive a signal by adopting the MIMO technique even in a channel environment unsuitable for the MIMO technique.
  • any modulation method may be used on the data divided from the MSB to the LSB.
  • FIG. 7 illustrates a method for transmitting a signal according to an embodiment of the present invention.
  • Error correction encoding is performed on the data that are to be transmitted, and then the error correction encoded data are demultiplexed into data units with respect to the multiple antenna paths from the MSB to the LSB (S110).
  • the demultiplexed data units are symbol-mapped to symbols that are to be transmitted to the respective antenna paths(S120).
  • the symbol-mapping method may be varied for each of the demultiplexed data sizes.
  • MIMO encoding is performed by using each of the mapped symbols (S130).
  • signal frames are configured by using the MIMO encoded and outputted signals (S140).
  • the signal frames on the antenna paths are modulated and transmitted respectively (S150).
  • FIG. 8 illustrates a method for receiving a signal according to an embodiment of the present invention.
  • Signals being received through multiple antenna paths are received, synchronization of each received signal is acquired, and then the signals are demodulated (S210).
  • the signals are demodulated (S210).
  • channel information for the respective antenna paths may be obtained.
  • signal frames of the demodulated signals with respect to the respective antenna paths are parsed (S220).
  • the channel correlation may be calculated by using the channel information obtained during the signal demodulation process.
  • the channel correlation may determine a correlation degree with respect to the channel information obtained from pilot signals included in the signal based upon a predetermined standard.
  • the channel correlation When the channel correlation is low, based upon the MIMO decoding result, the separated symbols of the signals corresponding to the antenna paths are respectively symbol-demapped, and then the symbol-demapped data are multiplexed, and, when the channel correlation is high, a symbol of a combination signal consisting of a combination of the signals corresponding to each antenna path are symbol-demapped based upon the respective symbol-mapping methods (The symbol-demapped data are outputted according to the channel correlation) (S240). Also, when the channel correlation is low, the symbol-demapping result corresponding to each antenna path corresponds to the data divided from the MSB to the LSB.
  • the multiplexed data are outputted, and when the channel correlation is high the symbol-demapped data are outputted, selectively (S250).
  • the symbol-demapped data are outputted by using both of the multiplexed data and the symbol-demapped data (in symbol-demapper 460) in accordance with the channel correlation.
  • the data divided from the MSB to the LSB are transmitted in accordance with the MIMO. Thereafter, symbol-mappings corresponding to the respective antenna paths may be performed based upon the channel correlation, or symbol-mapping may be performed on a signal consisting of a combination of the signals corresponding to each antenna path. Accordingly, the receiver can adopt the MIMO technique may be obtained from a channel unsuitable for the MIMO technique. Therefore, signals may still be transmitted and received, even when the channel status cannot be checked due to the absence of an up-link, such as in a broadcasting system, or when the MIMO technique cannot be adopted due to a high channel correlation. Furthermore, by transmitting data divided from the MSB to the LSB using the MIMO technique, signals robust against errors may be transmitted and received.
  • the present invention may be industrially applied in the fields of broadcasting and telecommunication.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radio Transmission System (AREA)

Abstract

Dans un aspect, la présente invention concerne un procédé de réception de signal. Ce procédé consiste à démoduler (S210) des signaux reçus de multiples antennes, respectivement; à effectuer un parsage (S220) de trames de signal des signaux démodulés dans des trajets d'émission, respectivement; à effectuer (S230) un décodage MIMO sur des signaux dans les trames de signal fondé sur une corrélation entre des canaux des signaux reçus des multiples antennes pour produire en sortie des symboles décodés MIMO vers des trajets multiples ou un trajet unique conformément à cette corrélation; une extraction de symboles (S240) des symboles décodés MIMO sur des données ayant subi une extraction de symboles conformément à la corrélation, les symboles décodés MIMO dans les trajets multiples ayant subi respectivement une extraction de symboles et les données ayant subi une extraction de symboles étant multiplexées, ou les symboles décodés MIMO dans le trajet unique ayant subi une extraction de symboles ensemble vers des données ayant subi une extraction de symbole; une production en sortie (S250) de données binaires en utilisant des données ayant subi une extraction de symboles multiplexées et/ou des données ayant subi une extraction de symboles dans le trajet unique; et un décodage de correction d'erreur (S260) est effectué sur les données binaires produite en sortie.
EP09755014.9A 2008-05-27 2009-05-26 Appareil d'émission et de réception de signal et procédé associé Withdrawn EP2286531A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5642908P 2008-05-27 2008-05-27
PCT/KR2009/002785 WO2009145549A2 (fr) 2008-05-27 2009-05-26 Appareil d'émission et de réception de signal et procédé associé

Publications (2)

Publication Number Publication Date
EP2286531A2 true EP2286531A2 (fr) 2011-02-23
EP2286531A4 EP2286531A4 (fr) 2014-09-17

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DK2533530T3 (en) * 2010-02-04 2016-01-25 Lg Electronics Inc Transmission signal sending and transmission signal transmission method
SI2533529T1 (sl) * 2010-02-04 2016-02-29 Lg Electronics Inc. Oddajnik oddajnih signalov in metoda za oddajanje
PL2533526T3 (pl) 2010-02-04 2016-04-29 Lg Electronics Inc Sposób odbierania i odbiornik sygnału rozgłoszeniowego

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WO2009145549A3 (fr) 2011-03-24
EP2286531A4 (fr) 2014-09-17

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