WO2009089654A1 - Procédé de commande de transmission de signal dans un réseau relais de coopération sans fil et dispositif correspondant - Google Patents

Procédé de commande de transmission de signal dans un réseau relais de coopération sans fil et dispositif correspondant Download PDF

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Publication number
WO2009089654A1
WO2009089654A1 PCT/CN2008/000121 CN2008000121W WO2009089654A1 WO 2009089654 A1 WO2009089654 A1 WO 2009089654A1 CN 2008000121 W CN2008000121 W CN 2008000121W WO 2009089654 A1 WO2009089654 A1 WO 2009089654A1
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WO
WIPO (PCT)
Prior art keywords
precoding
relay station
signal
transmitted
matrix
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PCT/CN2008/000121
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English (en)
Chinese (zh)
Inventor
Keying Wu
Xiaolong Zhu
Dong Li
Original Assignee
Alcatel Shanghai Bell Company, Ltd.
Alcatel Lucent
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.)
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Publication date
Application filed by Alcatel Shanghai Bell Company, Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Company, Ltd.
Priority to PCT/CN2008/000121 priority Critical patent/WO2009089654A1/fr
Priority to CN200880123942.1A priority patent/CN101919173B/zh
Publication of WO2009089654A1 publication Critical patent/WO2009089654A1/fr

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Classifications

    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays

Definitions

  • the present invention relates to a wireless cooperative relay network, and more particularly to a relay station and a destination device in a wireless cooperative relay network based on a closed loop MIMO technology.
  • the introduction of cooperative relay technology is beneficial to improve the quality of the received signal, improve the throughput of the system, and at the same time expand the coverage of the network.
  • an open-loop MIMO technology is usually adopted to implement a cooperative relaying scheme of multiple relay stations.
  • distributed space-time coding in open-loop MIMO technology can achieve spatial diversity gain, improve signal quality, and achieve a higher signal-to-noise ratio at the receiving end.
  • distributed space-time coding in open-loop MIMO technology can result in loss of transmission rate.
  • Spatial multiplexing in open-loop MIMO technology increases system throughput by transmitting different data streams over multiple transmit antennas to increase data transmission rates.
  • spatial multiplexing in open-loop MIMO technology may result in a degradation in the quality of the received signal.
  • the present invention proposes a method and apparatus for controlling signal transmission in a wireless cooperative relay network employing closed-loop MIMO technology.
  • the plurality of relay stations pre-code the signal to be transmitted from the source device according to the pre-coding information fed back by the destination device, and perform the pre-coded signal to be transmitted after being pre-coded.
  • the destination device After receiving the pre-coded to-be-transmitted signal from the plurality of relay stations, the destination device performs inverse pre-coding processing inverse to the previous pre-coding processing on the multiplex information to restore the signal transmitted via the source device.
  • a method for controlling signal transmission in a relay station of a wireless cooperative relay network employing closed-loop MIMO technology comprising the steps of: a. receiving a waiting from a source device Transmitting a signal ⁇ ,..., 0 ; b. precoding the signal to be transmitted according to the received precoding information from the destination device to generate a precoded signal to be transmitted; c. The pre-coded to-be-transmitted signal is sent to the destination device, where the method further includes the following steps: 0. Acquire the pre-coding information from the destination device.
  • a method for assisting control signal transmission in a destination device of a wireless cooperative relay network employing closed-loop MIMO technology characterized in that it comprises the following steps: A. Inverse precoding information, performing inverse precoding processing inverse to the precoding process on the precoded multiplex signals from the plurality of relay stations respectively received via the plurality of receiving antennas, to restore the source device
  • the transmitted signal further comprising the steps of: R, generating precoding information and the inverse precoding information according to training sequence related information from the plurality of relay stations; S. transmitting the precoding information separately To the plurality of relay stations.
  • a control apparatus for controlling signal transmission in a relay station of a wireless cooperative relay network employing a closed-loop MIMO technology, comprising: a first receiving apparatus, configured to receive from The signal to be transmitted of the source device, ⁇ , ⁇ , ⁇ , ⁇ ; the first pre-encoding device, configured to pre-code the signal to be transmitted according to the received pre-coding information from the destination device And the first sending device is configured to send the pre-coded signal to be transmitted to the destination device, where the method further includes: a first acquiring device, Obtaining the precoding information from the destination device.
  • an auxiliary control apparatus for assisting control signal transmission in a destination device of a wireless cooperative relay network employing a closed-loop MIMO technology, comprising: a first inverse precoding Device, based on the generated inverse Precoding information, performing inverse precoding processing inverse to the precoding process on the precoded multiplex signals from the plurality of relay stations respectively received via the plurality of receiving antennas to restore the transmission via the source device
  • the signal, ⁇ , ⁇ , ..., ⁇ further comprising: second generating means, configured to generate precoding information and the inverse precoding information according to training sequence related information from the plurality of relay stations; And a sending device, configured to separately send the precoding information to the multiple relay stations.
  • a closed loop MIMO technique is employed to implement a cooperative relaying scheme of a plurality of relay stations.
  • a plurality of closed-loop feedbacks are respectively performed between the destination device and the plurality of relay stations, and the plurality of relay stations respectively perform pre-coding processing on the information to be transmitted from the source device according to the pre-coding information fed back through the destination device, and are pre-coded.
  • the signal to be transmitted is sent to the destination device.
  • the destination device After receiving the pre-coded to-be-transmitted signal from the plurality of relay stations, the destination device performs inverse pre-coding processing inverse to the previous pre-coding processing on the multiplex information to restore the signal transmitted via the source device.
  • the generation of precoding information depends on channel related information.
  • FIG. 1 shows a schematic diagram of a wireless cooperative relay network employing closed-loop MIMO technology in accordance with the present invention
  • FIG. 2 illustrates a flow chart of a system method for controlling signal transmission in a wireless cooperative relay network employing closed-loop MIMO technology in accordance with an embodiment of the present invention
  • FIG. 3 illustrates an embodiment in accordance with the present invention. Schematic diagram of a control device for controlling signal transmission in a relay station of a wireless cooperative relay network employing closed-loop MIMO technology;
  • FIG. 4 is a block diagram showing the structure of an auxiliary control device for controlling signal transmission in a destination device of a wireless cooperative relay network employing closed-loop MIMO technology according to an embodiment of the present invention.
  • the same or similar reference numerals denote the same or similar components. detailed description
  • FIG. 1 shows a schematic diagram of a wireless cooperative relay network employing closed loop MIMO technology in accordance with the present invention.
  • the mobile terminal 1, the relay station 2a, the relay station 2b, and the base station 3 are shown in Fig. 1.
  • the mobile terminal 1, the relay station 2a and the relay station 2b each include a transmitting antenna.
  • the relay station 2a and the relay station 2b cooperate to transmit signals from the upper-level network device, that is, the mobile terminal 1, to the next-level network device, that is, the base station 3.
  • the base station 3 has two receiving antennas. It should be understood by those skilled in the art that although FIG.
  • the wireless communication network can simultaneously include Two or more relay stations work in cooperation, and each relay station may include a plurality of transmitting antennas.
  • the mobile terminal 1 transmits the signals ⁇ , 1 ⁇ 2 to the relay station 2a and the relay station 2b, respectively, in a broadcast manner.
  • the relay station 2a and the relay station 2b respectively process the signals from the mobile terminal 1 according to their working modes, respectively generating signals to be transmitted ⁇ ,..., ⁇ and ? ⁇ ⁇ ,..., . Further, the relay station 2a and the relay station 2b can operate in the amplification forward working mode or in the decoding forward working mode.
  • the following describes the relationship between the signal ", ", ⁇ ”, ..., ⁇ ) and the signal, ⁇ , 1 ⁇ 2, taking the signal transmission between the relay station 2a and the mobile terminal 1 as an example, the signal 3 ⁇ 4 ( 1) , 3 ⁇ 4 (1) , ⁇ ., ⁇ and the relationship between the signal x!, x 2 , , ⁇ , can be transported Signals for relay station 2b 3 ⁇ 4( 2 ), 3 ⁇ 4 2 ), 3 ⁇ 4( 2 ), ⁇ , 3 ⁇ 4 2 ) and signals
  • the relay station 2a and the relay station 2b operate in the amplifying forward working mode for the sake of simplicity, and the signal does not consider the influence of the complex complex white noise (complex AWGN) during the transmission, then the signal (", 3 ⁇ 4", The relationship between 3 ⁇ 4 (1 ) ,... , 3 ⁇ 4') and the signal ⁇ ⁇ , ⁇ 2 , ⁇ 3 , ⁇ , ⁇ ⁇ ⁇ can be described by the following formula:
  • 3 ⁇ 4 (1) is the kth element in ⁇ ) ⁇ 1 ), ⁇ ),..., ⁇ ), 3 ⁇ 4 is The kth element in the process, during the transmission and reception, (1) corresponds to: 1 ⁇ 2.
  • the channel attenuation coefficient between the mobile terminal 1 and the relay station 2a. 4 is the amplification gain provided by the relay station 2a.
  • the relationship between , , x 3 ,..., 1 ⁇ 2 can be described by the following formula: where 3 ⁇ 4 (1) is The kth element in , 3 ⁇ 4 is The kth element in the 3 ⁇ 4 (1) corresponds to 3 ⁇ 4 during transmission and reception.
  • the above is the signal to be transmitted ⁇ 0 ⁇ " ⁇ ", ..., ⁇ ) generated by the relay station 2a after receiving and transmitting the signal from the mobile terminal 1 for the two working modes of the relay station 2a, and the mobile terminal 1 transmits
  • the relationship between the signals is described.
  • the relay station 2a After the relay station 2a receives the signal transmitted from the mobile terminal 1, 3 ⁇ 4, 3 ⁇ 4, ⁇ , ⁇ and processes the signal to generate a signal to be transmitted ⁇ , the relay station 2a will utilize the received pre-received from the base station. Coded information to be transmitted x , x? , ,... , 3 ⁇ 4 perform precoding to generate pre-coded information to be transmitted.
  • the relay station 2b receives the signals ⁇ ⁇ , ⁇ 2 , ⁇ 3 , ⁇ ⁇ ⁇ , ⁇ ⁇ transmitted from the mobile terminal 1 and processes the signals to generate signals to be transmitted ( 2) , 3 ⁇ 4 (2) , 3 ⁇ 4 (2 after), ⁇ ⁇ ⁇ , 3 ⁇ 4 2 ), the relay station 2b the precoding information from the base station received to be transmitted, (2), 3 ⁇ 4 2), 3 ⁇ 4 2), ..., 3 ⁇ 4 2) precoding signals to The pre-coded information to be transmitted is generated.
  • the relay station 2a and the relay station 2b respectively perform the precoding processing on the signal to be transmitted from the mobile terminal 1, the relay station 2a and the relay station 2b synchronously transmit the precoded signal to be transmitted to the base station 3.
  • the two receiving antennas ⁇ and R x . 2 of the base station 3 receive the precoded signals from the relay station 2a and the relay station 2b, respectively.
  • the precoded signals from the relay station 2a and the relay station 2b are superimposed on each other in the propagation path, and then reach the two receiving antennas R x _i and R x _2 of the base station 3.
  • the base station 3 After the base station 3 receives the two signals to be inversely encoded and processed via the receiving antennas R x-1 and R x _ 2, the base station 3 performs inverse precoding processing on the two signals to be inversely precoded by using the generated inverse precoding information. To restore the signal ⁇ , ⁇ V transmitted via the mobile terminal 1.
  • the base station 3 can generate precoding information and inverse precoding information based on the training sequence related information from the relay station 2a and the relay station 2b. After generating the precoding information, the base station 3 transmits the precoding information to the relay station 2a and the relay station 2b, respectively, for precoding processing on the signal to be transmitted, and accordingly, the base station 3 uses the inverse precoding information pair via the receiving antenna and the R x _ 2 receives two signals to be inversely encoded and performs inverse encoding processing to restore the signal transmitted via the mobile terminal 1.
  • 2 shows a flow chart of a system method for controlling signal transmission in a wireless cooperative relay network employing closed loop technology in accordance with an embodiment of the present invention.
  • the mobile terminal 1 first transmits the training sequence to the relay station 2a and the relay station 2b, respectively, and then the relay station 2a and the relay station 2b respectively process the training sequence, and respectively transmit the processed training sequence to the base station 3.
  • Base station 3 based on relay from station 2a and relay
  • the processed training sequence of station 2b generates precoding information and inverse precoding information.
  • the relay station 2a and the relay station 2b pre-code the signal to be transmitted from the mobile terminal 1 according to the pre-coding information fed back by the base station 3, and transmit the pre-coded signal to be transmitted to the base station 3.
  • the base station 32 When the base station 32 receives the signal to be transmitted after the precoded from the relay station 2a and the relay station 2b is processed by the two receiving antennas ⁇ and R x _, for two-way information to inverse precoding previous precoding processing reverse to Processing to restore the signal transmitted via the mobile terminal 1.
  • step Sa the mobile terminal 1 transmits the training sequence to the relay station 2a and the relay station 2b in a broadcast manner, respectively.
  • step Sb after receiving the training sequence from the mobile terminal 1, the relay station 2a and the relay station 2b respectively process the training sequence and transmit the processed training sequence to the base station 3.
  • the relay station 2a and the relay station 2b respectively receive the training sequence from the mobile terminal 1, and process the training sequence and transmit it to the base station 3.
  • precoding uses codebook based precoding.
  • the relay station 2a When the relay station 2a operates in the amplifying forward mode of operation, after receiving the training sequence from the mobile terminal 1, the relay station 2a directly amplifies the training sequence and forwards it to the base station 3.
  • the relay station 2a When the relay station 2a operates in the decoding forward mode of operation, after receiving the training sequence from the mobile terminal 1, the relay station 2a discards the training sequence and inserts it into the new training sequence and transmits it to the base station 3.
  • step Sc the base station 3 is processed according to the relay station 2a and the relay station 2b.
  • the subsequent training sequence generates precoding information and inverse precoding information.
  • the relay station 2a and the relay station 2b and the base station 3 share a precoding codebook, wherein the precoding codebook includes a plurality of precoding matrices.
  • the base station 3 passes two receiving antennas.
  • R X _ 2 receives the processed training sequences transmitted from the relay station 2a and the relay station 2b, respectively, and performs channel estimation according to the training sequence to acquire a channel transmission matrix.
  • the matrix U H is used as inverse precoding information for performing inverse precoding processing on the pre-coded two-way signals from the relay station 2a and the relay station 2b respectively received via the two receiving antennas and R X _ 2 .
  • the base station 3 searches for the optimal precoding matrix W closest to the matrix W from the shared precoded codebook based on the matrix W and based on predetermined rules. Then, the base station 3 feeds back the index values of the optimal precoding matrix W, to the relay station 2a and the relay station 2b, respectively.
  • the relay station 2a and the relay station 2b respectively acquire the precoding matrix W corresponding to the index value from the shared precoding codebook based on the received index values of the optimal precoding matrix from the base station 3. Subsequently, the relay station 2a and the relay station 2b respectively obtain a row corresponding thereto from the respective obtained precoding matrices as precoding information to precode the signals from the mobile terminal 1, respectively.
  • the relay station 2a and the relay station 2b and the base station 3 do not need to share the precoding codebook.
  • Precoding uses random precoding
  • the relay station 2a When the relay station 2a is operating in the zoom forward working mode, the relay station 2a receives the slave station 2a. After the training sequence of the mobile terminal 1, the training sequence is pre-coded to generate a pre-coded training sequence to be transmitted.
  • the relay station 2a When the relay station 2a operates in the decoding forward working mode, after receiving the training sequence from the mobile terminal 1, the relay station 2a discards the training sequence and inserts a new training sequence, and then performs precoding processing on the new training sequence. A pre-coded training sequence to be transmitted is generated.
  • the relay station 2a and the relay station 2b first randomly generate a plurality of precoding matrices according to a certain time interval, wherein the number of rows of each precoding matrix is equal to the number of transmitting antennas of the relay station, and the number of columns is equal to the data simultaneously transmitted by the relay station 2a and the relay station 2b.
  • the number of streams, the number of streams simultaneously transmitted is not greater than the sum of the number of antennas of all the relay stations in the wireless cooperative relay network, and the number of base stations receiving antennas.
  • each precoding matrix is composed of two elements. Vector.
  • the relay station 2a and the relay station 2b respectively perform precoding processing on the training sequences from the mobile terminal 1 according to their respective generated precoding vectors, respectively, and respectively generate a plurality of pre-coded training sequences, and orthogonally (For example, time division multiplexing) A plurality of precoded training sequences are transmitted to the base station 3.
  • the pre-coded training sequences on different antennas also need to be orthogonally transmitted.
  • the relay station 2a and the relay station 2b also need to transmit a training sequence that has not undergone precoding processing to the base station 3, so that the base station 3 estimates its physical channel with the relay station 2a and the relay station 2b.
  • step Sc the base station 3 generates precoding information and inverse precoding information based on the pre-coded training sequence from the relay station 2a and the relay station 2b.
  • the base station 3 receives the pre-coded training sequence transmitted from the relay station 2a and the relay station 2b via the two receiving antennas R x . R x _ 2 , respectively. Further, after receiving a plurality of pre-coded training sequences transmitted from the relay station 2a and the relay station 2b in an orthogonal manner via the receiving antenna, the base station 3 first performs a plurality of pre-coded post-processing training from the relay station 2a. The sequence and the plurality of pre-coded processed training sequences from the relay station 2b are arbitrarily added to generate a plurality of channels received via the receiving antenna R X _ After the processed training sequence is added, the receiving antenna then receives the plurality of processed training sequences.
  • the base station 3 first pre-codes a plurality of pre-coded from the relay station 2a after receiving a plurality of pre-coded training sequences transmitted from the relay station 2a and the relay station 2b in an orthogonal manner via the receiving antenna R X _ 2
  • the processed training sequence and the plurality of pre-coded processed training sequences from the relay station 2b are arbitrarily added to generate a plurality of added training sequences received via the receiving antenna R X-2 , and then the receiving antenna R X _ 2 then receives the plurality of processed training sequences.
  • the base station 3 After the base station 3 receives the plurality of added processed training sequences via the receiving antenna and R X . 2 respectively, the base station 3 is directed to each pair of the added processed training sequences respectively received via the receiving antenna and R X _ 2 ( Each pair of the processed training sequence corresponds to each of any combination of a plurality of precoding vectors randomly generated by the relay station 2a and the relay station 2b, respectively, and estimates the equivalent channel, specifically, the equivalent The channel contains the physical channel between the base station 3 to the relay station 2a and the relay station 2b, and the two precoding vectors corresponding to the currently processed training sequence, and the optimal inverse precoding matrix is calculated accordingly.
  • the base station 3 utilizes the calculated optimum The precoding matrix performs inverse precoding processing on the added training sequence received by the pair via the receiving antennas R) and R X - 2 respectively, and then, the base station 3 performs two of the training sequences according to the inverse precoding processing result.
  • the signal's signal to noise ratio is estimated.
  • the base station 3 selects the pair of precoding vectors with the largest signal to interference and noise ratio as the optimal precoding vector according to the signal to interference and noise ratio estimation results of the two symbols in the training sequence corresponding to each pair of precoding vectors. And transmitting the index values of the pair of optimal precoding vectors to the relay station 2a and the relay station 2b, respectively. After the relay station 2a and the relay station 2b respectively receive the index values of the optimal precoding vectors from the base station 3, respectively obtain the optimal precoding vectors corresponding to the received index values from the previously randomly generated precoding vectors, respectively.
  • the signals to be transmitted from the mobile terminal 1 are precoded separately.
  • the base station 3 can also directly transmit a pair of optimal precoding vectors to the relay station 2a and the relay station 2b.
  • the relay station 2a and the relay station 2b pre-code the signals to be transmitted from the mobile terminal 1 according to the respectively received optimal precoding vectors.
  • step S1 the mobile terminal 1 signals in a broadcast manner. They are sent to the relay station 2a and the relay station 2b, respectively.
  • the relay station 2a and the relay station 2b After receiving the signals from the mobile terminal 1 respectively, the relay station 2a and the relay station 2b respectively process the signals from the mobile terminal 1 according to their working modes, respectively generating signals to be transmitted ⁇ ,..., ⁇ and , ⁇ ,..., . Further, the relay station 2a and the relay station 2b can operate in the amplification forward working mode or in the decoding forward working mode.
  • the following describes the relationship between the signal (1) , (1) , 3 ⁇ 4 (1) , ..., ⁇ and the signal, taking the signal transmission between the relay station 2a and the mobile terminal 1 as an example.
  • the relationship with the signal can be applied to the signal (2) , 3 ⁇ 4 2) , 3 ⁇ 4 2) , ⁇ , 3 ⁇ 4 2) and the signal for the relay station 2b.
  • the first case the relay station 2a and the relay station 2b operate in the forward forward working mode.
  • the signal does not consider additive complex Gaussian white noise during transmission.
  • 3 ⁇ 4 (1) is the kth element in ⁇ ⁇ , ⁇ 0 ,..., ⁇ ), 3 ⁇ 4 is
  • the kth element in ⁇ , ⁇ , ⁇ , ⁇ , ; ⁇ corresponds to 3 ⁇ 4 (1) and 3 ⁇ 4 during transmission and reception.
  • the attenuation coefficient between the mobile terminal 1 and the relay station 2a. 4 is medium The amplification gain provided by station 2a.
  • 3 ⁇ 4 is The kth element in the 3 ⁇ 4 (1) corresponds to 3 ⁇ 4 during transmission and reception.
  • the above is the to-be-transmitted signal ⁇ ", ⁇ , ⁇ ", ..., ⁇ and the mobile terminal generated by the relay station 2a receiving the signal transmitted from the mobile terminal 1 and processing it for the two working modes of the relay station 2a.
  • the relay station 2b receives the signal transmitted from the mobile terminal 1 and processes it to generate a signal to be transmitted (2) , 3 ⁇ 4 2) , 3 ⁇ 4 2) , ⁇ , 3 ⁇ 4 2) and the signal transmitted by the mobile terminal 1
  • a signal to be transmitted (2) , 3 ⁇ 4 2) , 3 ⁇ 4 2) , ⁇ , 3 ⁇ 4 2) and the signal transmitted by the mobile terminal 1
  • the relay station 2a receives the signal ⁇ , 3 ⁇ 4, 3 ⁇ 4', 1 ⁇ 2 transmitted from the mobile terminal 1, and processes the signal to generate a signal to be transmitted, 3 ⁇ 4 1 ⁇ , 3 ⁇ 4 0) , ..., 3 ⁇ 4 ⁇ , in step S2, The relay station 2a will use the received precoding information from the base station 3 to pre-code the signal to be transmitted, 3 ⁇ 4°, ..., 3 ⁇ 4 1 to generate the pre-coded information to be transmitted.
  • the relay station 2b receives the signals ⁇ 5 ⁇ 2 , 3 , . . . , 1 ⁇ 2 transmitted from the mobile terminal 1 and processes the signals to generate signals to be transmitted 2), 3 ⁇ 4 2 ), 2 ), ⁇ , 3 ⁇ 4 Thereafter, in step S2, the relay station 2b will pre-code the (2) , 3 ⁇ 4 2 , 3 ⁇ 4 (2) , ', 3 ⁇ 2 2) signals to be transmitted using the received precoding information from the base station 3 to generate a Information to be transmitted after precoding processing.
  • the following takes the relay station 2a as an example of the relay station 2a signal to be transmitted based on the precoding information 3 from the base station has been received, 3 ⁇ 4 0), 3 ⁇ 4 (1 ), ..., 3 ⁇ 4 1> precoded to generate a pre-coding process
  • the specific process of the information to be transmitted is described.
  • the precoding process is equally suitable For the relay station 2b, for the sake of brevity, no further details are provided herein.
  • the relay station 2a can divide the two sub-sequences in a parity arrangement, that is, the first sub-sequence is ⁇ , ?, ⁇ .
  • the relay station 2a is based on the received precoding information from the base station 3. Perform precoding processing on each of the two subsequences to generate a precoded signal to be transmitted
  • the relay station 2a performs precoding processing on the to-be-transmitted signal (1) (1) ⁇ (1) - , 3 ⁇ 4 1 ⁇ from the mobile terminal 1 by the following formula:
  • Each element in the matrix is each pre-coded symbol to be transmitted corresponding to the relay station 2a.
  • the elements are respectively taken from the signal to be transmitted from the mobile terminal 1 And the number of elements in i is equal to ⁇ . ,
  • the pre-coded signal to be transmitted is
  • the base station 3 in accordance with the inverse precoding information generated on the two signals 2 are received via two receive antennas 3 ⁇ 4 and R X _ precoded from the relay station 2a and the relay station 2b processing step with The precoding processes the inverse inverse precoding process to restore the signal transmitted via the mobile terminal 1, 1 ⁇ 2, 3 ⁇ 4, . . . , XJV.
  • the base station 3 After receiving the two to-be-reverse encoded processing signals via the receiving antennas RJM and R X. 2 , the base station 3 performs inverse pre-coding processing on the two-way inverse pre-coding processing signals by using the generated inverse pre-coding information to Restoring the signal transmitted via the mobile terminal 1
  • the following two methods for the relay station 2a and the relay station 2b respectively perform inverse pre-coding processing on the two-way inverse pre-coding processing signal to the base station 3 using the generated inverse pre-coding information to restore The process of transmitting the signal ⁇ , 1 ⁇ 2 via the mobile terminal 1 is described.
  • the base station 3 receives two signals to be inversely encoded through the receiving antenna and R X _ 2, which can be expressed by the following formula
  • H is the channel transmission matrix
  • ⁇ is the diagonal matrix
  • W is the same as or similar to the precoding matrix W
  • U is the conjugate transposed matrix of the inverse coding matrix U H .
  • the two-way inverse pre-coding processing signals may be inverse-pre-coded by the following formula to be restored via the mobile terminal. 1 signal sent, 3 ⁇ 4 , ⁇ : 3 , ⁇ , ⁇ ,
  • the base station 3 receives two signals to be inversely encoded and processed via the receiving antennas R x _i and R x _ 2 by the following formula
  • Each element is taken from the signal transmitted via the mobile terminal 1, respectively.
  • ⁇ ⁇ , , (2) , (2) a ' 2 ( L ⁇ ) J , a "' , respectively, are the channel attenuation coefficients between the relay station 2a and the two receiving antennas of the relay station 2b and the base station 3.
  • H is the channel transmission matrix
  • ⁇ is the diagonal matrix
  • U is a conjugate transposed matrix of the inverse coding matrix U H .
  • the two-way inverse pre-coding processing signal may be inverse-pre-coded by the following formula to restore the transmission via the mobile terminal 1.
  • Signal, 3 ⁇ 4, N 3 ⁇ 4, N
  • FIG. 3 shows the control for the relay in the wireless cooperative relay network employing the closed-loop MIMO technology according to an embodiment of the present invention.
  • Schematic diagram of the control device for signal transmission. 3 includes a mobile terminal 1, a relay station 2a, a relay station 2b, and a base station 3.
  • the relay station 2a includes a control device 21a, wherein the control device 21a includes a first receiving device 211a, a first pre-encoding device 212a, a first transmitting device 213a, and a first obtaining device 214a.
  • the relay station 2b includes a control device 21b, wherein the control device 21b includes a first receiving device 211b, a first precoding device 212b, a first transmitting device 213b, and a first obtaining device 214b. It should be understood by those skilled in the art that although FIG.
  • the wireless communication network can include both Two or more relay stations work together, and each relay station may include multiple transmit antennas
  • the mobile terminal 1 first transmits the training sequence to the relay station 2a and the relay station 2b, respectively, and then the relay station 2a and the relay station 2b respectively process the training sequence, and respectively transmit the processed training sequence to the base station 3.
  • the base station 3 generates precoding information and inverse precoding information based on the processed training sequence from the relay station 2a and the relay station 2b.
  • the relay station 2a and the relay station 2b pre-code the signal to be transmitted from the mobile terminal 1 according to the pre-coding information fed back by the base station 3, and transmit the pre-coded signal to be transmitted to the base station 3.
  • the base station 3 After receiving the pre-coded to-be-transmitted signals from the relay station 2a and the relay station 2b via the two receiving antennas R x — R x — 2 , the base station 3 performs inverse prediction on the two-way information opposite to the previous pre-encoding processing. An encoding process to restore the signal transmitted via the mobile terminal 1.
  • the mobile terminal 1 transmits the training sequence to the relay station 2a and the relay station 2b in a broadcast manner.
  • the receiving devices in the relay station 2a and the relay station 2b respectively receive the training sequence from the mobile terminal 1, process the training sequence, and respectively pass the transmitting device (for the sake of brevity, The processed training sequence is transmitted to the base station 3, not shown in FIG.
  • the receiving device in the relay station 2b has the same function, and for brevity, it will not be described here.
  • the relay station 2a and the relay station 2b respectively receive the training sequence from the mobile terminal 1, and the training sequence is The column is processed and sent to the base station 3.
  • the relay station 2a and the relay station 2b respectively receive the training sequence from the mobile terminal 1, and the training sequence is The column is processed and sent to the base station 3.
  • Precoding uses codebook-based precoding
  • the relay station 2a When the relay station 2a operates in the amplifying forward mode of operation, after the receiving device in the control device 21a receives the training sequence from the mobile terminal 1, the second transmitting device in the control device 21a directly amplifies the training sequence and forwards it to the base station 3. .
  • the receiving device in the control device 21a discards the training sequence and inserts the new training sequence and passes the second in the control device 21a.
  • the transmitting device transmits it to the base station 3.
  • the base station 3 receives the processed training sequences transmitted from the relay station 2a and the relay station 2b via the two receiving antennas R X _ PR x . 2 , and performs channel estimation based on the training sequence to acquire a channel transmission matrix.
  • the precoding information and the inverse precoding information are then generated by performing singular value decomposition on the transmission matrix. And transmitting the precoding information to the relay station 2a and the relay station 2b, respectively.
  • Precoding uses random precoding
  • the receiving device in the control device 21a performs precoding processing on the training sequence to generate a pre-coded training sequence to be transmitted.
  • the relay station 2a When the relay station 2a operates in the decoding forward mode of operation, after receiving the training sequence from the mobile terminal 1, the receiving device in the control device 21a discards the training sequence and inserts a new training sequence, and then, the control device 21a
  • the second pre-encoding means (for clarity, not shown in FIG. 3) pre-encodes the new training sequence to generate a pre-coded training sequence to be transmitted.
  • the first generating device in the relay station 2a and the relay station 2b first randomly generates a plurality of precoding vectors at a certain time interval, wherein the number of rows of each precoding matrix is equal to the number of transmitting antennas of the relay station, and the number of columns is equal to the relay station 2a and The number of data streams simultaneously transmitted by the relay station 2b, and the number of data streams simultaneously transmitted is not greater than the sum of the number of transmitting antennas of all the relay stations in the wireless cooperative relay network and the number of receiving antennas of the base station.
  • each The precoding matrix is a vector containing two elements.
  • the second precoding apparatus in the relay station 2a and the relay station 2b respectively performs precoding processing on the training sequence from the mobile terminal 1 according to the respective precoding vectors generated by the respective stations, and respectively generates a plurality of precoding processed trainings. sequence.
  • the third transmitting means in the relay station 2a and the relay station 2b respectively transmit a plurality of precoding processes in an orthogonal manner (for example, time division multiplexing) during a mini-slot of the beginning portion of each slot.
  • the subsequent training sequence is to base station 3.
  • the pre-coded training sequences on different antennas also need to be orthogonally transmitted.
  • the fourth transmitting means in the relay station 2a and the relay station 2b also needs to transmit the pre-coded training sequence to the base station 3, so that the base station 3 estimates its physical channel with the relay station 2a and the relay station 2b.
  • the base station 3 generates precoding information and inverse precoding information based on the pre-coded training sequence from the relay station 2a and the relay station 2b, and transmits the precoding information to the relay station 2a and the relay station 2b, respectively.
  • the mobile terminal 1 transmits the signals 3 ⁇ 4, . . . , ⁇ ⁇ to the relay station 2a and the relay station 2b in a broadcast manner.
  • the first receiving device 211a of the control device 21a included in the relay station 2a and the first receiving device 211b of the control device 21b included in the relay station 2b receive signals from the mobile terminal 1 respectively, respectively, according to their operating modes.
  • a mobile signal terminal 1 from the processing generates signals to be transmitted ⁇ , ⁇ , ⁇ . ⁇ "and (2), 3 ⁇ 4 (2) , 3 ⁇ 4 (2), ⁇ . ⁇ , 3 ⁇ 4 2).
  • the relay station 2a And the relay station 2b can work in the zoom forward working mode or in the decoding forward working mode.
  • the first case the relay station 2a and the relay station 2b operate in the forward forward working mode.
  • the signal does not consider additive complex Gaussian white noise during transmission.
  • 3 ⁇ 4 (1) is the kth element in ⁇ ), ⁇ ), ⁇ ), ⁇ , 3 ⁇ 4"
  • the kth element in the 3 ⁇ 4 (1) corresponds to 3 ⁇ 4 during transmission and reception.
  • the attenuation coefficient between the mobile terminal 1 and the relay station 2a. 4 is the amplification gain provided by the relay station 2a.
  • 3 ⁇ 4 (1) is the kth element in ⁇ ) ⁇ 1 ), ⁇ ), ⁇ , 3 ⁇ 4), 3 ⁇ 4 is The kth element in the 3 ⁇ 4 (1) corresponds to 3 ⁇ 4 during transmission and reception.
  • the above is the signal to be transmitted generated by the first receiving device 211a of the relay station 2a receiving the signal transmitted from the mobile terminal 1 and processing it for the two working modes of the relay station 2a. And a description of the relationship between the signals x 15 x 2 , x 3 , . . . transmitted by the mobile terminal 1.
  • First receiving means 2b, 211b relay station receives the signal transmitted from the mobile terminal 1 and generates a process this signal to be transmitted (2), 2), 2 ), ⁇ , 3 ⁇ 4 2) and the mobile terminal 1
  • the relationship between the transmitted signals can also be determined by the above formula (a), (b) Description.
  • the first receiving device 211a in the relay station 2a receives the signal transmitted from the mobile terminal 1. And processing the signal to generate a signal to be transmitted
  • the first precoding device 212a in the relay station 2a uses the received precoding information from the base station 3 to transmit the signal Precoding is performed to generate pre-coded information to be transmitted.
  • the first receiving device 211b in the relay station 2b receives the signal transmitted from the mobile terminal 1. And after processing the signal to generate the signals to be transmitted ( 2) , 3 ⁇ 4 2) , 3 ⁇ 4 (2) , . . . , 3 ⁇ 4 2) , the first precoding device 212b in the relay station 2b utilizes the received received from the base station 3.
  • the precoding information is precoded to transmit (2) , 3 ⁇ 4 (2) , 2) , —, 3 ⁇ 4 2) signals to generate pre-coded information to be transmitted.
  • the relay station 2a is taken as an example to the first precoding device 212a in the relay station 2a to transmit a signal based on the received precoding information from the base station 3.
  • the first pre-encoding device 212b in the relay station 2b has the same function, and is not described herein for the sake of brevity.
  • the aliquoting device in the relay station 2a can divide the two sub-sequences in a parity arrangement, that is, the first sub-sequence is ⁇ , ⁇ , ..., ⁇ ..., and the second sub-sequence is
  • the first precoding device 212a in the relay station 2a is based on the received precoding information from the base station 3. Perform precoding processing on each of the two subsequences to generate a precoded signal to be transmitted
  • the first precoding device 212a in the relay station 2a pairs the signal to be transmitted from the mobile terminal 1, X? , 3 ⁇ 4 (1) ,... , 3 ⁇ 4 1 ⁇ Precoding processing can be performed by the following formula (1)
  • Each element in the matrix Pi is each pre-coded symbol to be transmitted corresponding to the relay station 2a.
  • Wi ⁇
  • the elements are respectively taken from the signal to be transmitted from the mobile terminal 1
  • the pre-coded signal to be transmitted is i 2) 3 ⁇ 4? ⁇ + 3 ⁇ 4 ( 2 ) 3 ⁇ 4 2 ) + 2 ) 3 ⁇ 4 2 ), ⁇ , 3 ⁇ 4 ⁇ ).
  • the pre-coded signal to be transmitted is i 2) 3 ⁇ 4? ⁇ + 3 ⁇ 4 ( 2 ) 3 ⁇ 4 2 ) + 2 ) 3 ⁇ 4 2 ), ⁇ , 3 ⁇ 4 ⁇ ).
  • the first precoding device 212a and the first precoding device 212b in the relay station 2a and the relay station 2b respectively perform precoding processing on the signal to be transmitted from the mobile terminal 1, the first of the control devices 21a included in the relay station 2a
  • the transmitting device 213a and the first transmitting device 213b of the control device 21b included in the relay station 2b synchronize the two signals to be transmitted after the precoding process.
  • the base station 3 according to the inverse precoding information generated on the two signals 2 are received via two receive antennas and R x _ Rx.i precoded from the relay station 2a and 2b of the relay station for processing the precoded Processing inverse inverse precoding processing to restore via mobile
  • the signal sent by terminal 1 is 3 ⁇ 4, , ⁇ ⁇ ⁇ , ⁇ .
  • the transmitting device, the first, second, third, and fourth transmitting devices may be the same transmitting device, the receiving device, and the first, second, and third receiving devices may be the same receiving device, and the first and second precoding devices may be the same precoding device.
  • Device. 4 is a block diagram showing the structure of an auxiliary control device for controlling signal transmission in a destination device of a wireless cooperative relay network employing closed-loop MIMO technology according to an embodiment of the present invention. 4 includes a mobile terminal 1, a relay station 2a, and a relay station 2b, and a base station 3.
  • the base station 3 includes an auxiliary control device 31, wherein the auxiliary control device 31 includes a first inverse precoding device 311, a second generating device 312, and a fifth transmitting device 313.
  • FIG. 4 only takes two single-antenna relay stations (relay station 2a and relay station 2b) to work together as an example to implement the technical solution of the present invention
  • the wireless communication network can simultaneously include Two or more relay stations work in cooperation, and each relay station may include a plurality of transmitting antennas.
  • the mobile terminal 1 first transmits the training sequence to the relay station 2a and the relay station 2b, respectively, and then the relay station 2a and the relay station 2b respectively process the training sequence, and respectively transmit the processed training sequence to the base station 3.
  • the base station 3 generates precoding information and inverse precoding information based on the processed training sequence from the relay station 2a and the relay station 2b.
  • the relay station 2a and the relay station 2b pre-code the signal to be transmitted from the mobile terminal 1 according to the pre-coding information fed back by the base station 3, and transmit the pre-coded signal to be transmitted to the base station 3.
  • the base station 3 receives the pre-coded signals to be transmitted from the relay station 2a and the relay station 2b via the two receiving antennas R x _i and R x . 2 respectively, and then inverses the two-way information against the previous pre-encoding processing.
  • the precoding process is to restore the signal transmitted via the mobile terminal 1.
  • the mobile terminal 1 separately transmits the training sequence to the relay station 2a in a broadcast manner. And relay station 2b.
  • the relay station 2a and the relay station 2b After receiving the training sequence from the mobile terminal 1, the relay station 2a and the relay station 2b process the training sequence separately, and transmit the processed training sequence to the base station 3.
  • the training sequence from the mobile terminal 1 is received by the relay station 2a, and the training sequence is processed and transmitted to the base station 3 for explanation.
  • the relay station 2b has the same function, and will not be described here for the sake of brevity.
  • the relay station 2a and the relay station 2b respectively receive the training sequence from the mobile terminal 1, and the training sequence is processed and transmitted to the base station 3.
  • the relay station 2a and the relay station 2b respectively receive the training sequence from the mobile terminal 1, and the training sequence is processed and transmitted to the base station 3.
  • other r. precoding uses codebook based precoding.
  • the relay station 2a When the relay station 2a operates in the amplifying forward mode of operation, after receiving the training sequence from the mobile terminal 1, the relay station 2a directly amplifies the training sequence and forwards it to the base station 3.
  • the relay station 2a When the relay station 2a operates in the decoding forward mode of operation, after receiving the training sequence from the mobile terminal 1, the relay station 2a discards the training sequence and inserts it into the new training sequence and transmits it to the base station 3.
  • the base station 3 generates precoding information and inverse precoding information based on the processed training sequence from the relay station 2a and the relay station 2b.
  • the relay station 2a and the relay station 2b and the base station 3 share a precoding codebook, wherein the precoding codebook includes a plurality of precoding matrices.
  • the fourth receiving device of the second generating device 312 included in the base station 3 passes through two receiving antennas.
  • the second obtaining device in the second generating device 312 (not shown in FIG. 4) is based on the training sequence.
  • Channel estimation is performed to obtain a channel transmission matrix.
  • the second acquisition means in the auxiliary control means 31 acquires the channel transmission matrix H based on the processed training sequence from the relay station 2a and the relay station 2b
  • the transposition device in the auxiliary control device 31 conjugates the matrix W H and the matrix , to obtain the conjugate transposed matrix of the matrix W H and the matrix ⁇ , respectively.
  • W and ⁇ ⁇ the matrix ⁇ ⁇ the inverse precoding information for inverse precoding two signals _ 2 precoded respectively received from the relay station 2a and the relay station 2b is processed by the two receiving antennas R x-1 and R x deal with.
  • the lookup means in the auxiliary control device 31 (not shown in FIG. 4 for simplicity) is based on the matrix W and based on a predetermined rule, finds the most approximate and optimal from the matrix W from the shared precoding codebook. Precoding matrix W,. Then, the fifth transmitting means 313 of the auxiliary control means 31 included in the base station 3 feeds back the index values of the optimum precoding matrix W, to the relay station 2a and the relay station 2b, respectively.
  • Precoding uses random precoding
  • the relay station 2a When the relay station 2a operates in the amplifying forward mode of operation, after receiving the training sequence from the mobile terminal 1, the relay station 2a performs precoding processing on the training sequence to generate a pre-coded training sequence to be transmitted.
  • the relay station 2a When the relay station 2a operates in the decoding forward working mode, after receiving the training sequence from the mobile terminal 1, the relay station 2a discards the training sequence and inserts a new training sequence, and then performs precoding processing on the new training sequence. A pre-coded training sequence to be transmitted is generated.
  • each precoding matrix is a vector containing two elements.
  • the relay station 2a and the relay station 2b pre-code the training sequences from the mobile terminal 1 according to their respective generated pre-coding vectors, and respectively generate a plurality of pre-coded training sequences.
  • the relay station 2a and the relay station 2b respectively transmit a plurality of pre-coded training sequences to the base station in an orthogonal manner (for example, time division multiplexing) during a mini-slot at the beginning of each slot. 3.
  • relay station 2a or relay station 2 includes multiple transmit antennas, the precoded training sequences on different antennas also need to be transmitted orthogonally.
  • the relay station 2a and the relay station 2b also need to transmit a training sequence that has not undergone precoding processing to the base station 3, so that the base station 3 estimates its physical channel with the relay station 2a and the relay station 2b.
  • the second generation means 312 of the auxiliary control means 31 included in the base station 3 generates precoding information and inverse precoding information based on the pre-coded training sequence from the relay station 2a and the relay station 2b.
  • the fifth receiving device in the auxiliary control device 31 via two receiving antennas R x _ 2 receives the pre-coded training sequence transmitted from the relay station 2a and the relay station 2b, respectively.
  • the adding means in the first inverse encoding device 311 (for the sake of simplicity, FIG. 4 The first pre-coded training sequence from the relay station 2a and the plurality of pre-coded processed training sequences from the relay station 2b are arbitrarily added to generate a plurality of received via the receiving antenna.
  • the receiving antenna Rx ⁇ then receives the plurality of added training sequences.
  • the first inverse encoding The adding means in the device 311 first arbitrarily adds the plurality of pre-coded training sequences from the relay station 2a and the plurality of pre-coded processed training sequences from the relay station 2b to generate via the receiving antenna R x _ 2 After receiving the plurality of processed training sequences, the receiving antenna 1 ⁇ 2 then receives the plurality of processed training sequences.
  • the fourth obtaining means in the second generating means 312 (not shown in FIG. 4)
  • Each pair of the added processed training sequences respectively received via the receiving antennas R x _i and R x _ 2 (each pair of processed training sequences corresponding to the plurality of pre- randomly generated by the relay station 2a and the relay station 2b, respectively)
  • Equivalent channel is estimated for each of any combination of coding vectors, specifically, the equivalent channel includes a physical channel between base station 3 to relay station 2a and relay station 2b, and a corresponding training sequence corresponding to the current processing Two precoding vectors are calculated, and the optimal inverse precoding matrix is calculated accordingly.
  • the fourth of the second generating means 312 The obtaining device performs inverse pre-coding processing on the added training sequence respectively received by the pair via the receiving antenna and R x _ 2 by using the calculated optimal pre-coding matrix, and then, according to the result of the inverse pre-coding processing, training The signal to interference and noise ratio of the two symbols in the sequence is estimated.
  • the fourth obtaining means in the second generating means 312 selects the pair having the largest signal to noise ratio based on the signal to interference and noise ratio estimation results of the two symbols in the training sequence corresponding to each pair of precoding vectors.
  • the precoding vector is used as the optimal precoding vector
  • the fifth transmitting means 313 in the auxiliary control means 31 transmits the index values of the pair of optimal precoding vectors to the relay station 2a and the relay station 2b, respectively.
  • the relay station 2a and the relay station 2b respectively receive the index values of the optimal precoding vectors from the base station 3, respectively obtain the optimal precoding vectors corresponding to the received index values from the previously randomly generated precoding vectors, respectively.
  • the signals to be transmitted from the mobile terminal 1 are precoded separately.
  • the fifth transmitting means 313 in the auxiliary control means 31 can also directly transmit a pair of optimal precoding vectors to the relay station 2a and the relay station 2b. checkpoint 2a and the relay station 2b precode the signal to be transmitted from the mobile terminal 1 based on the respectively received optimal precoding vectors.
  • the mobile terminal 1 transmits the signals 3 ⁇ 4, 3 ⁇ 4, ..., ⁇ to the relay station 2a and the relay station 2b in a broadcast manner.
  • the relay station 2a and the relay station 2b After receiving the signals from the mobile terminal 1 respectively, the relay station 2a and the relay station 2b respectively process the signals from the mobile terminal 1 according to their working modes, respectively generating signals to be transmitted ⁇ ), ⁇ ), ⁇ ), ..., ⁇ ⁇ ) ⁇ 2 ), ⁇ ),..., ⁇ ). Further, the relay station 2a and the relay station 2b can operate in the zoom forward working mode or in the decoding forward working mode.
  • the relay station 2a receives the signal transmitted from the mobile terminal 1, x 2 , x 3 , ''', Xw and processes the signal to generate a signal to be transmitted ", 3 ⁇ 4'), ⁇ , 3 ⁇ 4'), the relay station 2a will use the received precoding information from the base station 3 to be transmitted, 3 ⁇ 4', 3 ⁇ 4 (1) , ..., to perform precoding to generate precoded information to be transmitted,
  • the relay station 2b receives the signals ⁇ ⁇ , ⁇ 2 , ⁇ 3 , - ⁇ , ⁇ ⁇ from the mobile terminal 1 and processes the signal to generate a signal to be transmitted ( 2 ), 3 ⁇ 4 2 ), 3 ⁇ 4 2 ), ⁇ , after 3 ⁇ 4 2), the use of the relay station 2b to be transmitted (2) pre-coding information from the base station 3 Pat received, 3 ⁇ 4 2), 3 ⁇ 4 2) ., 3 ⁇ 4 2) precoding signals to generate Information to be transmitted after precoding processing.
  • the relay station 2a is used as an example for the relay station 2a to pre-code the signal to be transmitted according to the received precoding information from the base station 3, 3 ⁇ 4 (1) , (1) , ..., 3 ⁇ 4 1 > to generate a pre-coded process.
  • the information to be transmitted is described.
  • the relay station 2b also has this function, and for brevity, it will not be described here.
  • the relay station 2a can divide the two sub-sequences in a parity arrangement, that is, the first sub-sequence is), ⁇ ),..., ⁇ ,..., the second sub-sequence is ⁇ ), ⁇ ), ⁇ , , ⁇ .
  • the relay station 2a is based on the received precoding information from the base station 3
  • the pre-coded signal to be transmitted is
  • the relay station 2a and the relay station 2b respectively perform the precoding processing on the signal to be transmitted from the mobile terminal 1, the relay station 2a and the relay station 2b synchronize the pre-coded two signals to be transmitted 3 ⁇ 4 2 They are sent to the base station 3 separately.
  • the first inverse precoding device 311 of the auxiliary control device 31 included in the base station 3 pairs the receiving antennas via the two based on the generated inverse precoding information!
  • Two signals ⁇ and precoded 1 ⁇ _ 2 are received from the relay station 2a and the relay station 2b processing inverse pre-coding processing to the precoding process inverse to restore the signal transmitted via the mobile terminal 1 .
  • the first inverse pre-encoding device 311 After receiving the two to-be-reverse encoded processing signals via the receiving antenna R x _ 2 , the first inverse pre-encoding device 311 performs inverse pre-coding on the two-way inverse pre-coding processed signals by using the generated inverse pre-coding information. Processing to restore the signal transmitted via the mobile terminal 1
  • the following two modes of operation for the relay station 2a and the relay station 2b are respectively applied to the first inverse precoding device 311 in the base station 3 by using the generated inverse precoding information
  • the pre-encoding processing signal is subjected to inverse pre-encoding processing to restore the signal 1 ? '" - - NN transmitted via the mobile terminal 1 for description.
  • the base station 3 receives two signals to be inversely encoded and processed via the receiving antennas R x _i and R x _ 2 by the following formula
  • Each element is taken from the signal ⁇ transmitted via the mobile terminal 1, respectively, ⁇
  • H is the channel transmission matrix
  • ⁇ is a diagonal matrix
  • W is the same as the precoding matrix W
  • U is the conjugate transpose matrix of the inverse coding matrix U H .
  • the two-way inverse pre-coding processing signals may be inverse-pre-coded by the following formula to be restored via the mobile terminal. 1 sent signal,
  • W is the same as or similar to the precoding matrix W.
  • the base station 3 receives two signals to be inversely encoded and processed via the receiving antennas R x _i and R x _ 2 by the following formula
  • Each element is taken from the signal 3 ⁇ 4, . . . , N transmitted by the mobile terminal 1, respectively, and the number of elements in X is equal to N. among them,
  • ⁇ is the channel transmission matrix
  • ⁇ is a diagonal matrix
  • U is the conjugate transpose matrix of the inverse coding matrix U H .
  • the signal W transmitted by the terminal 1 is the same as or similar to the precoding matrix w.
  • the first and second inverse encoding devices may be the same inverse encoding device
  • the second, third, and fourth obtaining devices may be the same acquiring device
  • the fourth and fifth receiving devices may be the same receiving device.

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Abstract

L'invention porte sur un procédé pour commander une transmission de signal dans un réseau relais de coopération sans fil qui utilise la technique entrée multiple sortie multiple (MIMO) en boucle fermée, et sur un dispositif correspondant. Le procédé comprend les opérations suivantes : il existe de multiples rétroactions en boucle fermée entre un dispositif destinataire et de multiples stations relais respectivement ; selon les informations de précodage renvoyées par le dispositif destinataire, de multiples stations relais exécutent respectivement un processus de précodage sur le signal qui doit être transmis à partir d'un dispositif source, et transmettent le signal précodé devant être transmis au dispositif destinataire ; une fois que le dispositif destinataire a reçu le signal précodé devant être transmis en provenance de multiples stations relais, le dispositif destinataire exécute un processus anti-précodage sur le message à trajets multiples contraire au processus de précodage précédemment effectué afin de récupérer le signal transmis par le dispositif source, la génération d'information de précodage étant dépendante d'informations relatives aux canaux.
PCT/CN2008/000121 2008-01-17 2008-01-17 Procédé de commande de transmission de signal dans un réseau relais de coopération sans fil et dispositif correspondant WO2009089654A1 (fr)

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CN200880123942.1A CN101919173B (zh) 2008-01-17 2008-01-17 无线协作中继网络中控制信号传输的方法及其装置

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