Cooperative communication multi-resolution self-adapting wave beam forming method

An adaptive beam, multi-resolution technology, applied in the directions of space transmit diversity, diversity/multi-antenna systems, baseband system components, etc., can solve codebook mismatch, beamforming adaptability and spectrum utilization in cooperative communication performance degradation, etc., to achieve channel adaptation, improve spectrum utilization, and reduce the average amount of feedback data.

Inactive Publication Date: 2011-09-14
XIDIAN UNIV
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Problems solved by technology

[0004] The disadvantage of the above method is that when the multi-antenna configuration scenarios, usage scenarios, and channel scenario combinations involved are changeable, there will be more serious codebook mismatches, which will lead to beamforming adaptiveness and spectrum utilization in cooperative communication. rate of performance degradation

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  • Cooperative communication multi-resolution self-adapting wave beam forming method
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  • Cooperative communication multi-resolution self-adapting wave beam forming method

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Embodiment Construction

[0030] The present invention will be further described below with reference to the drawings.

[0031] in figure 2 In the cooperative communication beamforming scenario shown, the process of completing the cooperative communication beamforming in the present invention is as follows: figure 1 As shown, the implementation steps are as follows:

[0032] Step (1) Store the codebook collection

[0033] 1a) Determine the number of codebooks. According to the limit of the average feedback bit number of the communication system, the data center processor of the communication system calculates the maximum number of codebooks allowed by the multi-resolution Glassman space packing method according to the following formula:

[0034] log 2 L + X k = 0 L - 1 log 2 ( 2 k m ) ≤ B

[0035] Among them, L is the number of codebooks in the codebook set, ∑(·) represents the cumulative sum, k is the counting factor (0≤k≤L-1), and m is the number of e...

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Abstract

The invention discloses a cooperative communication multi-resolution self-adapting wave beam forming method which solves the codebook mismatching phenomenon and the problem of low backward channel frequency spectrum utilization ratio in the prior art. The method comprises the following concrete steps of: (1) building a plurality of codebooks of different resolutions according to performance requirements of a system, and storing at a transmitting end and a receiving end; (2) estimating an equivalent channel matrix from the transmitting end to the receiving end, and carrying out singular value decomposition (SVD); (3) searching an optimal wave beam forming matrix from the codebook set according to the performance requirements of the system, and feeding back index numbers to the transmittingend; and (4) finding out an optimal wave beam forming matrix from a local codebook set according to the received index numbers by the transmitting end, thus forming a wave beam. The cooperative communication multi-resolution self-adapting wave beam forming method has the advantages of stronger self adaptivity and smaller average feedback data amount on different channel scenes, realizes the channel adaptation as highest as possible, and improves the frequency spectrum utilization ratio of the backward channel of a cooperative communication system.

Description

Technical field [0001] The present invention belongs to the field of communication technology, and further relates to an adaptive beamforming method for a cooperative communication transmitter in the field of wireless communication, and has the characteristics of improving the robustness of cooperative communication and the utilization rate of downlink channel spectrum resources. Background technique [0002] When performing beamforming in cooperative communication, channel state information (CSI) feedback is required from the receiving point to the transmitting point, the receiving point to the relay node, and the relay node to the transmitting point. Therefore, feedback is required. The amount of CSI data is relatively large, and limited feedback can be used to reduce the number of feedback bits and improve the reverse channel utilization. The effect of limited feedback is closely related to the beamforming matrix codebook used at the receiving and transmitting ends, so the des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08H04L25/02
Inventor 刘毅李勇朝王晓元张海林
Owner XIDIAN UNIV
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