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Method and device of space division multiple address system based on codebook of optimal quantization error

A technology of quantization error and space division multiple access, which is applied in the field of wireless transmission, can solve the problems of ineffective quantization of channel state information and lack of correlation, etc., and achieve the effects of optimized quantization, good flexibility, and reduced average quantization error

Inactive Publication Date: 2008-10-15
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] According to the literature search of the prior art, among the SDMA methods based on partial channel state information, "SDMA with a sum feedback rate" published by Kaibing Huang et al. in the seventh issue of "IEEE Transactions on Signal Processing" (Signal Processing) constraint” (Space Division Multiple Access under Feedback Rate Limitation), this paper proposes an SDMA technology based on orthogonal beamforming-single elementary stream user and rate control (PU2RC), the specific method is: multi-user beamforming vector from The disadvantage of selecting from multiple codebooks of orthogonal beamforming vector sets is that the orthogonal beamforming vector sets are independently generated, have no correlation, and cannot effectively quantify channel state information

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  • Method and device of space division multiple address system based on codebook of optimal quantization error
  • Method and device of space division multiple address system based on codebook of optimal quantization error
  • Method and device of space division multiple address system based on codebook of optimal quantization error

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Embodiment 1

[0043] In this embodiment, the number N of orthogonal codebook subsets is generated s = 16 4-dimensional orthogonal codebook set, the training sample is the direction of channel generation according to the above-mentioned multipath Rayleigh channel model, and the number of training samples is N training =6400, the initial orthogonal codebook set is generated by randomly generating N s A 4-dimensional complex array is obtained by orthogonal triangular transformation. The generated orthogonal codebook set is shown in the table below

[0044] subset 1 codeword 1

[0045] -0.891731188876234

[0046] 0.498883698236420+0.112325218037903i

[0047] -0.467277315232727 -0.043574267084703i

[0048] 0.554992319357231-0.247579896249830i

[0049] Subset 12 Codeword 1

[0050] -0.517015974614324+0.003896812938730i

Embodiment 2

[0052] In this embodiment, the number N of orthogonal codebook subsets is generated s The 4-dimensional orthogonal codebook set of =64, the training sample is the direction of channel generation according to the above-mentioned multipath Rayleigh channel model, and the number of training samples is N training =25600, the initial orthogonal codebook set is generated by randomly generating N s A 4-dimensional complex array is obtained by orthogonal triangular transformation.

[0053] The curve of the average quantization error with the number of iterations is as follows image 3 As shown, the algorithm for designing the codebook in the present invention is convergent, and the average quantization error stabilizes after about 20 iterations, and an orthogonal codebook set with good performance can be obtained.

Embodiment 3

[0055] This embodiment is based on the above-mentioned multipath Rayleigh channel model, using the orthogonal codebook set generated in Embodiment 1 and the randomly generated orthogonal codebook set as the codebook respectively, the system scheduling strategy is PU2RC, and the number of system users is K=100 When , comparing the rate sums obtained by using two codebooks under different SNRs, the results are as follows Figure 4 shown. It can be found that the codebook generated by the codebook design algorithm proposed by the present invention is better than the codebook generated by the traditional random codebook design algorithm under different SNR situations. It can be seen that the algorithm proposed by the present invention is suitable for different SNR environments. Has good adaptability.

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Abstract

The invention relates to a method for space division multiple-access (SDMA) system basing on an optimal quantification error code book and a device thereof and is used in the technical field of wireless transmission. The method comprises the steps that first, a corresponding initial orthogonal code book set is generated according to the number of feedback bits supported by the system and the training samples of a signal channel matrix are selected randomly at the same time; second, the training samples are distributed to each code word region by adopting the principle of shortest distance; third, quantification error is minimized by adopting an optimum principle, the code book of the regions are renewed according to the samples of each region and the quantification error is recorded; fourth, orthogonal triangular decomposition is carried out to new code books in the sub-set of the same orthogonal code book and the code book is renewed to a row, from which unitary matrix is obtained by decomposition; fifth, judgment on whether the error is reduced is carried out and the process is stopped if the error is reduced, otherwise the process is repeated from the second step. The device of the invention comprises a receiving end device and a matched transmission end device. The invention can reduce the quantification error and improve the throughput capacity of the system under the condition of not increasing of feedback bits, has stable and powerful performance and is easy to be achieved.

Description

technical field [0001] The present invention relates to an orthogonal beamforming method and device in the technical field of wireless transmission, in particular to a method and device for a space division multiple access system based on an optimal quantization error codebook. Background technique [0002] As the core technology of the next-generation mobile communication (4G) system, MIMO technology can effectively improve diversity gain, increase system capacity, and meet the basic requirements of users for high-speed data transmission. In the mobile communication system, it is necessary to provide services for multiple users at the same time. For the MIMO downlink system, that is, the broadcast channel, in order to improve the multiplexing gain and make the system capacity linear with the number of base station transmitting antennas, space division multiple access can be used. (SDMA) mode, which has been adopted by the IEEE 802.16e standard, and has also been submitted t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/08H04L1/00H04L1/06
Inventor 陈磊罗汉文佘锋张宇张静
Owner SHANGHAI JIAO TONG UNIV
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