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Implementation method for reducing average feedback quantity of codebook and optimizing codebook

An average feedback and codebook technology, applied in the communication field, can solve the problem of high search complexity, achieve the effect of reducing the number of code words and search complexity

Inactive Publication Date: 2013-02-27
XIDIAN UNIV
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Problems solved by technology

That is, the information of each codeword is not fully utilized in feedback coding, and the average coded bits given are far greater than the source entropy, and in the determination of the optimal codeword, all codewords need to be searched, that is, the search complexity is relatively high. high

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  • Implementation method for reducing average feedback quantity of codebook and optimizing codebook
  • Implementation method for reducing average feedback quantity of codebook and optimizing codebook
  • Implementation method for reducing average feedback quantity of codebook and optimizing codebook

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Embodiment Construction

[0037] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0038] Step one, select the communication environment.

[0039] According to the statistical results of the probability distribution of channel parameter amplitude values ​​in different communication environments, the communication environment in which the distribution of channel parameter amplitude values ​​is concentrated is selected as the communication environment of the present invention. figure 2 Give the probability distribution diagrams of the channel parameter amplitude values ​​in the urban environment, rural environment, and indoor environment, figure 2 It can be clearly seen that for the urban environment, the probability distribution of the amplitude greater than 2.6 is almost zero, and the amplitude distribution is relatively concentrated. Therefore, the urban environment is selected as the communication environment in the actual implementation, and the urba...

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Abstract

The invention provides an implementation method for reducing average feedback quantity of a codebook and optimizing the codebook, belonging to the technical field of communication, mainly solving the problem that the average feedback quantity of the 3GPP Rel8 codebook is large and code words are complex to search. The implementation method comprises the following steps of: counting the selection probability of each code word by using a channel statistic characteristic; performing variable-length encoding to each code word according to the selection probability of each code word, and testing the throughput; deleting the code word with small probability, and counting the selection probability of the remain code words so as to obtain the variable-length encoding of each code word and the test value of the throughput; continuously deleting the code word until the test value of the throughput and the code word searching complexity satisfy the system requirements; and taking the codebook composed by the remain code words as the final codebook. The method effectively decreases the average feedback quantity of the codebook and the code word searching complexity; and the effect to the throughput can be ignored. The method can be used in LTE-A for meeting the IMT-Advanced technical demands.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a codebook in 3GPP Rel8, in particular to a method for reducing the average feedback amount of the codebook and further optimizing the codebook, which can be used for precoding of multi-user MIMO. Background technique [0002] In order to meet the requirements of LTE in terms of high data rate and high system capacity, the LTE system supports multiple-input multiple-output technologies for downlink applications, including spatial multiplexing, beamforming, and transmission diversity. For spatial multiplexing, LTE supports open-loop spatial multiplexing and closed-loop spatial multiplexing, which is the so-called linear precoding technology. The function of the linear precoding operation is to convert the processing in the antenna domain to the beam domain for processing, and use the known spatial channel information at the transmitting end to perform preprocessing operations,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/03H04B7/06
Inventor 任光亮段昕利张会宁杨丽花
Owner XIDIAN UNIV
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