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WO2009076863A1 - Méthode et station de base utilisées pour transmettre des signaux de liaison descendante - Google Patents

Méthode et station de base utilisées pour transmettre des signaux de liaison descendante Download PDF

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Publication number
WO2009076863A1
WO2009076863A1 PCT/CN2008/073352 CN2008073352W WO2009076863A1 WO 2009076863 A1 WO2009076863 A1 WO 2009076863A1 CN 2008073352 W CN2008073352 W CN 2008073352W WO 2009076863 A1 WO2009076863 A1 WO 2009076863A1
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updated value
module
calculated
value
calculating
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PCT/CN2008/073352
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English (en)
Chinese (zh)
Inventor
Lvxi Yang
Daofeng Xu
Yinggang Du
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • 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

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and a base station for transmitting a downlink signal.
  • MIMO Multi-Input Multiple-Output
  • the multi-user MIMO downlink can use Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDM A), and Orthogonal Frequency Division Multiple Access (OFDM).
  • TDMA Time Division Multiple Access
  • CDMA Code Division Multiple Access
  • OFDM A Orthogonal Frequency Division Multiple Access
  • OFDM Orthogonal Frequency Division Multiple Access
  • SDMA Space Division Multiple Access
  • SDMA can support multiple users in the same time slot and frequency band, so the system capacity can be doubled. Since multiple users share system resources, and each user generally cannot cooperate to process received signals, the problem of multi-user interference suppression becomes the key to system performance.
  • the basic way to solve this problem is to transmit precoding.
  • Common precoding methods include: linear precoding, nonlinear precoding, and joint transceiver design.
  • the joint transceiver design combines the transmit precoding and the receiving matrix with certain criteria, such as the minimum mean square error (MMSE, Mininum Mean Square Error) criterion and the zero forcing criterion, so that the performance of the system is achieved.
  • MMSE minimum mean square error
  • N k the number of supported data streams is .
  • the data S k of the first user is sent to the transmitting antenna through the precoding matrix, so the signal actually transmitted by the base station is:
  • the signal received by the first user is:
  • y k H k x + ⁇ ( 2 ) where is the channel matrix between the base station and the first user, ⁇ ⁇ 0, ⁇ 2 /) is additive white Gaussian noise.
  • each user linearly processes the received signal to recover his own data. Let the first user use G as the linear receiver, then the estimate for
  • FIG. 1 the block diagram of the prior art multi-user MIMO downlink transceiver is shown in Figure 1.
  • the precoding matrix is first designed by using the above method, and the designed precoding matrix is used to process the downlink signal, and the processed downlink signal is sent out.
  • the embodiment of the invention provides a method for transmitting a downlink signal, which enables the base station to process the downlink signal and shorten the processing time when transmitting the downlink signal.
  • the embodiment of the present invention further provides a base station, where the base station sends a downlink signal, the processing process is relatively simple, and the processing time is short.
  • the downlink signal is processed according to the calculated w, and the processed downlink signal is transmitted.
  • a base station the base station includes:
  • a processing and sending module configured to process the downlink signal according to the W calculated by the computing module, and send the processed downlink signal.
  • the method for transmitting a downlink signal and the base station in the embodiment of the present invention provide a common coefficient by calculating a pre-coding matrix for each user's receiver when calculating the pre-coding matrix, so that the base station is transmitting downlink.
  • the processing of the link signal is simple, and the processing time is short.
  • FIG. 1 is a block diagram of a prior art multi-user MIMO downlink transceiver design
  • FIG. 2 is a block diagram showing a design of a multi-user MIMO downlink transceiver according to an embodiment of the present invention
  • 3 is a convergence performance curve of different embodiments of the present invention at different signal to noise ratios
  • FIG. 4 is a erroneous symbol rate performance curve 1 calculated by using MMSE according to an embodiment of the present invention
  • FIG. 5 is a second erroneous symbol rate performance curve calculated by using MMSE according to an embodiment of the present invention
  • FIG. 6 is a calculation using ZF criterion according to an embodiment of the present invention. Error symbol rate performance curve. detailed description
  • the downlink signal is processed according to the calculated W, and the processed downlink signal is transmitted.
  • the linear equalization criterion used when calculating the precoding matrix is W may be the MMSE criterion.
  • the calculation method using the MMSE criterion is specifically described below.
  • FIG. 2 is a block diagram of a multi-user MIMO downlink transceiver according to an embodiment of the present invention.
  • the k-th user's Mean Square Error (MSE) is
  • equation (20) It can be seen from equation (20) that after the common gain factor g is introduced, the precoding matrix of the transmitting end has a closed solution, and the closed solution is independent of g.
  • equation (20) is cleaner than existing linear coding methods, and there is only one unknown matrix variable in the transmit precoding matrix in the equation, it is still difficult to solve W directly, because /) is dependent on W.
  • the solution of W at this time can be solved independently of the pair, that is, W can be solved directly by iteration.
  • the following two iterative solution schemes are proposed here:
  • Each user individually designs the receiver G k according to the MMSE criteria.
  • the transmitting end processes the pilot signal according to the calculated w, and transmits the processed pilot signal; after receiving the processed pilot signal, the receiving end calculates the receiving end receiving matrix G according to the MMSE criterion.
  • the alternate optimization iteration first divides the parameters to be optimized into several groups. When optimizing one of the parameters, it is assumed that other group parameters have been fixed, and when the updated values of the group parameters are obtained, they can be used for optimization of other group parameters.
  • the direct iterative solution method has the same convergence performance because it is a cylindrical form of alternating iterative solution.
  • Figure 3 is a graph showing convergence performance at different signal to noise ratios using an embodiment of the present invention. As the signal-to-noise ratio increases, the convergence speed becomes slower. However, when the signal-to-noise ratio is less than 10 dB, the iterations of about 5 times have basically converged. The effect of signal-to-noise ratio on the convergence speed is mainly due to the influence of ⁇ on the convergence, which can be seen from equation (20).
  • the simulation of the embodiment of the present invention is as follows:
  • the simulation environment is as follows:
  • the channel between the base station and each user is Rayleigh flat fading, the channel remains unchanged in one data frame, and can be accurately known on the base station side.
  • I UB 50.
  • the information symbols in all simulations are QPSK modulated, and the number of Monte Carlo simulations is more than 10,000 times under various parameter configurations.
  • FIG. 4 is a performance rate curve 1 of the symbol error rate calculated by using the MMSE according to the embodiment of the present invention
  • FIG. 5 is a second performance curve of the symbol error rate calculated by using the MMSE according to the embodiment of the present invention.
  • the embodiment of the present invention may also calculate W by using a zero forcing (ZF, Zero Forcing) criterion.
  • ZF Zero Forcing
  • Fig. 6 is a graph showing the error symbol rate performance curve calculated by the ZF criterion in the embodiment of the present invention.
  • the method for transmitting a downlink signal proposed by the present invention has a calculation method when designing a linear transceiver, so that when the base station transmits a downlink signal, the process is processed and the processing time is compared. short.
  • the embodiment of the invention further provides a base station, including:
  • the linear equalization criterion used in the initialization and calculation module may be an MMSE criterion, a ZF criterion, or the like.
  • H )" H x , H 2 are the second users
  • the channel matrix, , " p ' , ⁇ 2 is the power of the additive white Gaussian noise, ⁇ is the total transmission power of the system, / is the unit matrix;
  • a determining module configured to determine whether a norm of a difference between the updated value of the current W calculated by the second calculating module and the updated value of the last W is greater than a preset threshold, and if yes, indicating the first calculating The module recalculates the updated value of W. Otherwise, it determines that the updated value of this time W is calculated.
  • the initialization and calculation module may include:
  • the power of additive white Gaussian noise is the total transmit power of the system;
  • a determining module configured to determine whether a norm of a difference between the updated value of the current W calculated by the calculating module and the updated value of the last W is greater than a preset threshold, and if yes, instructing the computing module to recalculate The updated value of W, otherwise, it is determined that the update value of this time W is calculated.
  • the W determining module may be configured to determine that a norm of a difference between an update value of the current W calculated by the calculation module or the first calculation module and an update value of the last W is not greater than a preset For the threshold value, the updated value of the obtained W is normalized according to the transmission power, and the updated value of W after the normalization is determined as the calculated W.
  • the above base station may further include:
  • the pilot signal processing transmitting module is configured to process the pilot signal determined according to the W determined by the W determining module, and send the processed pilot signal.
  • the method and base station for transmitting a downlink signal propose an improved transceiver structure, and propose an effective iterative algorithm to solve the problem of solving the precoding matrix at the transmitting end, so that the transmitting problem is
  • the complexity of the base station processing process is reduced, and the processing time of the base station is made shorter.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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

Abstract

L'invention porte sur une méthode et une station de base utilisées pour transmettre des signaux de liaison descendante. Selon la méthode, et en admettant que la matrice précodage d'extrémité de transmission W soit calculée selon un critère d'égalisation linéaire, les signaux de liaison descendante sont traités en utilisant le W calculé. La méthode permet de simplifier et de raccourcir le processus de transmission de signaux de liaison descendante par la station de base
PCT/CN2008/073352 2007-12-14 2008-12-05 Méthode et station de base utilisées pour transmettre des signaux de liaison descendante Ceased WO2009076863A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2007103021122A CN101459634B (zh) 2007-12-14 2007-12-14 一种发送下行链路信号的方法及基站
CN200710302112.2 2007-12-14

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WO2009076863A1 true WO2009076863A1 (fr) 2009-06-25

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WO (1) WO2009076863A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105450277B (zh) 2010-12-10 2018-11-20 太阳专利托管公司 发送方法和发送系统以及接收方法和接收装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1653768A (zh) * 2002-03-27 2005-08-10 高通股份有限公司 Mimo系统中多径信道的预编码
WO2007051192A2 (fr) * 2005-10-27 2007-05-03 Qualcomm Incorporated Procede et appareil de precodage pour systeme mimo
CN101087169A (zh) * 2006-06-09 2007-12-12 上海原动力通信科技有限公司 Tdd系统的线性预编码方法及装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1653768A (zh) * 2002-03-27 2005-08-10 高通股份有限公司 Mimo系统中多径信道的预编码
WO2007051192A2 (fr) * 2005-10-27 2007-05-03 Qualcomm Incorporated Procede et appareil de precodage pour systeme mimo
CN101087169A (zh) * 2006-06-09 2007-12-12 上海原动力通信科技有限公司 Tdd系统的线性预编码方法及装置

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CN101459634B (zh) 2011-06-01
CN101459634A (zh) 2009-06-17

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