WO2012010048A1 - Procédé et système de transmission de relais coopératif basés sur un précodage à rétroaction limitée - Google Patents

Procédé et système de transmission de relais coopératif basés sur un précodage à rétroaction limitée Download PDF

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Publication number
WO2012010048A1
WO2012010048A1 PCT/CN2011/076710 CN2011076710W WO2012010048A1 WO 2012010048 A1 WO2012010048 A1 WO 2012010048A1 CN 2011076710 W CN2011076710 W CN 2011076710W WO 2012010048 A1 WO2012010048 A1 WO 2012010048A1
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Prior art keywords
signal
received
relay
user
relay station
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PCT/CN2011/076710
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English (en)
Chinese (zh)
Inventor
梁枫
毕峰
袁明
吴栓栓
杨瑾
姜静
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中兴通讯股份有限公司
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Publication of WO2012010048A1 publication Critical patent/WO2012010048A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path

Definitions

  • the present invention relates to a relay technology in the field of wireless communications, and in particular, to a cooperative relay transmission method and system based on limited feedback precoding. Background technique
  • the International Telecommunication Union defined a new generation of mobile communication systems, the IMT-Advanced (International Mobile Telecommunication) system, in 2005, to explore the next generation of mobile communications.
  • the new architecture of the network will be the core issue for further research.
  • wireless relay technology Under low-cost conditions, wireless relay technology has become a kind of realization of broad application prospects in the framework of next-generation wireless communication systems because relay can effectively enhance the transmission efficiency of the system, expand cell coverage, and suppress inter-cell interference.
  • the solution has been identified as one of the key enhancement technologies of IMT-Advanced; currently the Institute of Electrical and Electronics Engineers (IEEE, 802.16m, 3rd Generation Partnership Project)
  • the LTE-Advanced (Long Term Evolution-Advanced) standards organization is conducting research on relay technology. Introducing trunking in LTE-Advanced systems can improve high data rate coverage, group mobility, temporary network configuration and cell edge throughput, and provide coverage in new areas.
  • the relay In the uplink of the cellular system based on the wireless relay, the relay needs to receive information of multiple users, and processes the data to the base station in a certain manner; the base station recovers the data sent by the user end by combining the data from the user end and the relay end. Data and give users a collaborative gain.
  • network coding techniques such as network coding based on bit-level XOR (XOR) and network coding based on symbol-level overlapping modulation can be used in the relay. Users gain collaboration gain while saving forwarding resources.
  • the relay and the base station can usually configure multiple antennas, and how to perform multi-user signal processing on the relay and the base station to obtain the cooperation gain. There is no related solution in the prior art.
  • the existing relay network model is shown in Fig. 1, in which the user and ⁇ , as well as the relay station R and the base station D are included.
  • the relay station and the base station are each configured with multiple antennas, and the relay stations are distributed in a certain area to assist communication between the wireless terminal and the base station.
  • time slot 1 and time slot 2 are broadcast phases, and respectively broadcast respective data S ⁇ o S 2 , the relay station and the base station are in the receiving mode; in the time slot 3, the relay station uses the precoding matrix P fed back by the base station to preprocess and forward the data estimates of the two users, and the destination end performs data signals from the user end and the relay station. Merge to get the cooperative diversity gain.
  • ( ⁇ ) indicates a signal preprocessing method used by the relay station.
  • the relay station R can learn a certain way to judge whether the signal can be correctly received. Then there are four kinds of relay scenarios as follows: 1. The relay station R can correctly receive the signal of ⁇ 2 ; 2. The relay station R The signal can only be correctly received; 3. The signal that the relay station R can only receive correctly; 4. The relay station R cannot correctly receive the signal.
  • the superscript indicates the time slot
  • P is the 2x2 precoding matrix
  • ( e ⁇ l,2 ⁇ ) represents the channel vector of user i to the base station
  • h id ( e ⁇ l, 2 ⁇ ) indicates the channel vector of the ith antenna of the relay station R to the base station
  • ⁇ is the detected value of the relay station R in the broadcast phase and the transmitted data, respectively. Therefore, there are four kinds of relay scenarios as follows: 1. The relay station R can correctly receive the signal of the ⁇ ; 2. The relay station R can only correctly receive the signal; 3. The relay station R can only correctly receive the signal; 4. The relay station R cannot be correctly Receive and signal. In each scenario, the base station combines the signals received in the two phases and uses the maximum likelihood decision to obtain the cooperative diversity gain.
  • Equation (4) shows that the received signal of the cooperative system in the third time slot is the same as the multiple-input multiple-output (MIMO) spatial division multiplexing system, using traditional linear zero-forcing (ZF) equalization.
  • G left multiply, you can get the decision statistics of the 3rd time slot
  • the main object of the present invention is to provide a cooperative relay transmission method and system based on limited feedback precoding to solve the performance loss of the existing ZF receiver due to the non-orthogonality of the equivalent subchannels ⁇ and ⁇ The problem.
  • the present invention provides a cooperative relay transmission method based on limited feedback precoding, the method comprising:
  • the base station and the relay station receive signals from a plurality of users
  • the relay station determines whether the received signal is correct. When it is determined that the signals from the plurality of users are correctly received, the signal is pre-coded and then forwarded to the base station; if the received signal is received correctly, the receiving is also incorrect. When the signal is received, the correct signal is forwarded to the base station in a non-precoded manner, and the incorrectly received signal is not forwarded; when all the signals are received incorrectly, no forwarding is performed;
  • the base station combines the received signal directly sent by the user with a signal forwarded from the relay station for the same user, and estimates the signal of the user; the terminal directly sent by the user and the relay station does not perform The forwarded signal is directly judged to estimate the signal of the user.
  • the relay station determines whether the received signal is correct, specifically:
  • the relay station performs a cyclic redundancy (CRC) check on the received signal from the user to determine whether the received signal is correct;
  • CRC cyclic redundancy
  • the relay station compares the received signal to noise ratio of the signal from the user with a preset threshold, and if the signal to noise ratio of the signal is not lower than the preset threshold, determining that the signal is received correctly; otherwise, It is judged that the signal is received incorrectly.
  • the precoding matrix of the precoding process is sent by the base station to a codebook finger sent to a relay station
  • the code information indication information includes: an index of a precoding matrix generation parameter or a precoding matrix generation parameter in a precoding matrix generation parameter set;
  • the relay station generates a precoding matrix P according to the precoding matrix generation parameter according to the following formula:
  • the present invention also provides a cooperative relay transmission system based on limited feedback precoding, the system comprising: a base station and a relay station, wherein
  • the relay station is configured to receive signals from a plurality of users, determine whether the received signal is correct, and when determining that signals from a plurality of users are correctly received, perform precoding processing on the signals and forward the signals to the base station; When receiving the correct signal or receiving the incorrect signal, the correct signal is forwarded to the base station by non-precoding, and the incorrect signal is not forwarded; the signal is not received correctly. When not, forwarding is not performed;
  • the base station is configured to receive signals from a plurality of users, perform a combined decision on the received signal directly sent by the user, and a signal forwarded from the relay station for the same user, to estimate the signal of the user;
  • the signal sent directly by the user and not forwarded by the relay station is directly determined, and the signal of the user is estimated.
  • the relay station is further configured to perform a CRC check on the received signal from the user to determine whether the received signal is correct.
  • the relay station is further configured to compare the received signal to noise ratio of the signal from the user with a preset threshold, and determine that the signal is received correctly when the signal to noise ratio of the signal is not lower than the preset threshold; When the signal to noise ratio of the signal is lower than the preset threshold, it is determined that the signal is received incorrectly.
  • the base station is further configured to: specify a precoding matrix of the precoding process by using codebook indication information that is sent to the relay station, where the codebook indication information includes: a precoding matrix generation parameter corresponding, and the relay station further uses The precoding matrix generation parameter generates a precoding matrix P by:
  • the invention provides a cooperative relay transmission method and system based on limited feedback precoding, which receives signals from a plurality of users by a base station and a relay station; the relay station determines whether the received signal is correct, and passes the correct signal through precoding. Or non-pre-coded mode forwarded to the base station, does not forward and receive the incorrect signal; the base station combines the received signal directly sent by the user with the signal forwarded from the relay station for the same user, and estimates the user's signal; The signal sent directly from the user and not relayed by the relay station is directly judged, and the signal of the user is estimated.
  • the present invention it is possible to make full use of limited system resources and make the relay system The overall error performance improves network transmission reliability.
  • 1 is a schematic diagram of an existing relay network model
  • FIG. 2 is a schematic diagram of time slots occupied by a cooperative transmission process in the prior art
  • FIG. 3 is a flowchart of a method for cooperative relay transmission based on limited feedback precoding according to the present invention
  • FIG. 4 is a schematic diagram of orthogonal decomposition of a channel at a base station according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of cooperative relay transmission based on CRC check according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of cooperative relay transmission based on received signal to noise ratio judgment according to an embodiment of the present invention.
  • the present invention decomposes the channel H into two orthogonal subchannels in the vector space, and the channel orthogonal decomposition diagram at the base station side is as follows.
  • the present invention utilizes a two-dimensional signal detection technique to separate the sums of the signals in equation (8), i.e., the hypotheses and the in-phase components and the quadrature components, respectively.
  • Al and p l2 should be divided into 1 J and ap 2l and ap 22 . Further, if p ⁇ 0, -jp n ⁇ 0, then ap 2l ⁇ 0, -jap 22 > .
  • MRC Maximal Ratio Combining
  • Re(.) represents the real part of the signal
  • the optimal precoding matrix P is satisfied.
  • equation (18) the precoding matrix P is determined only by parameters, the amount of feedback required is small, and the implementation complexity is low. Substituting equation (18) into (10), the decision statistics and 3 in slot 3 are obtained.
  • the base station performs a joint maximum likelihood decision on the two-stage decision statistical signal, and the estimated value of the sum is obtained.
  • S is the set of signals on the constellation diagram.
  • the base station performs maximum ratio combining on the signals received in the two stages, and the available decision variable is
  • the base station performs maximum ratio combining on the signals received in the two stages, and the available decision variable is
  • the decision variables obtained in each scene are sent to the Maximum Likelihood (ML) decoder to obtain the signal estimates of the sum.
  • ML Maximum Likelihood
  • the scenario of configuring two or more antennas for the relay station and the base station, as shown in FIG. 4, mainly includes the following steps:
  • Step 401 The base station and the relay station receive signals from a plurality of users.
  • Step 402 The relay station determines whether the received signal is correct, and forwards the received correct signal to the base station in a pre-coded or non-pre-coded manner, and does not forward the received incorrect signal.
  • Step 403 The base station combines the received signal directly sent by the user with the signal forwarded by the relay station for the same user, and estimates the signal of the user.
  • the signal directly sent by the user and not forwarded by the relay station is directly determined. , estimate the user's signal.
  • the relay station may perform a Cyclic Redundancy Check (CRC) check on the received signal from the user to determine whether the received signal is correct, and perform cooperative relay transmission based on the CRC check of the relay station.
  • CRC Cyclic Redundancy Check
  • the schematic diagram is shown in Figure 5.
  • the relay station may compare the received signal-to-noise ratio of the signal from the user with a preset threshold, and if the signal-to-noise ratio of the signal is not lower than the preset threshold, determine that the signal is received correctly; otherwise, determine that the signal is not received. correct.
  • a schematic diagram of cooperative relay transmission implemented based on the received signal to noise ratio of the relay station is shown in FIG. 6.
  • the signal When the relay station judges that the signals from multiple users are correctly received, the signal is precoded and forwarded to the base station; when both the correct signal is received and the incorrect signal is received, the correct signal is received through the non-precoding.
  • the method is forwarded to the base station, and the signal that is not received correctly is not forwarded; when all the signals are received incorrectly, no forwarding is performed.
  • the relay station judges that the signals from the two users are correctly received, the signal is pre-coded and then forwarded to the base station; if the relay station judges the signals from the two users If one of the receivers receives correctly and the other receives incorrectly, only the correct received signal is forwarded to the base station in a non-precoded manner, and the incorrectly received signal is not forwarded; if the relay station judges that the signals from both users are received incorrectly , then it will not be forwarded.
  • the precoding matrix of the precoding process is specified by the base station by using codebook indication information that is sent to the relay station, where the codebook indication information includes: a precoding matrix generation parameter or a precoding matrix generation parameter k in the precoding matrix generation parameter set. Index in
  • the relay station generates parameters according to the precoding matrix fed back by the base station.
  • the present invention also provides a cooperative relay transmission system based on limited feedback precoding, which is composed of a base station and a relay station.
  • the relay station is configured to receive signals from multiple users, and determine whether the received signal is correct.
  • the received signal is forwarded to the base station in a pre-coded or non-pre-coded manner, and the incorrectly received signal is not forwarded.
  • a base station configured to receive signals from a plurality of users, and combine the received signals directly sent by the user with the signals forwarded by the relay station for the same user, and estimate the signal of the user;
  • the relay station does not perform a direct decision on the forwarded signal to estimate the user's signal.
  • the relay station is further configured to perform a CRC check on the received signal from the user to determine whether the received signal is correct. Or comparing the received signal-to-noise ratio of the signal from the user with a preset threshold, and when the signal-to-noise ratio of the signal is not lower than a preset threshold, determining that the signal is received correctly; the signal-to-noise ratio of the signal is lower than When the threshold is preset, it is judged that the signal is not received correctly.
  • the relay station is further configured to: when it is determined that the signals from the plurality of users are correctly received, the signal is pre-coded and then forwarded to the base station; when both the correct signal is received and the incorrect signal is received, the receiving is correct.
  • the signal is forwarded to the base station in a non-precoded manner, and the signal that is not received correctly is not forwarded; when all signals are received incorrectly, no signal is forwarded.
  • the limited system resources can be fully utilized to maximize the coding gain and diversity gain of the relay system, thereby improving the forwarding efficiency of the system, improving the error performance of the relay system, and improving network transmission reliability. Sex.

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

Abstract

La présente invention concerne un procédé et un système de transmission d'un relais coopératif basés sur un précodage à rétroaction limitée. Le procédé comprend les étapes suivantes : une station de base et une station relais reçoivent des signaux provenant de multiples utilisateurs (401) ; la station relais juge si les signaux reçus sont corrects ou non, retransmet les signaux correctement reçus vers la station de base avec ou sans précodage, et ne retransmet pas les signaux incorrectement reçus (402) ; la station de base évalue les signaux d'un utilisateur en effectuant une décision combinatoire pour les signaux reçus directement transmis par l'utilisateur et les signaux retransmis par la station relais pour le même utilisateur, et évalue les signaux de l'utilisateur en effectuant une décision directe pour les signaux qui sont transmis directement par l'utilisateur et ne sont pas retransmis par la station relais (403). La présente invention permet d'améliorer l'efficacité de retransmission et les performances d'erreur sur les bits pour un système de relais.
PCT/CN2011/076710 2010-07-23 2011-06-30 Procédé et système de transmission de relais coopératif basés sur un précodage à rétroaction limitée WO2012010048A1 (fr)

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CN201010235205.X 2010-07-23
CN201010235205XA CN102340380A (zh) 2010-07-23 2010-07-23 一种基于有限反馈预编码的协作中继传输方法和系统

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