Method for reducing feedback quantity and improving system throughput rate based on limiting feedback technology

Abstract

The invention provides a method for reducing the feedback quantity and improving the system throughput rate based on limiting feedback technology. The method comprises the following steps of: dividing channel space based on a chordal distance maximization rule, generating a codebook set, and storing the codebook set at a receiving end and a sending end; quantifying channel state information into a specific code in the codebook set by the receiving end according to a quantifying rule, and feeding an index of the specific code back to the sending end; receiving the index by the sending end, and obtaining a corresponding code from the codebook set according to the index by the sending end; and reconstructing a channel by the sending end by taking the code as a channel direction. By feedback of a code sequence number, the feedback expense is reduced, and the complexity of searching the code in a quantifying process is reduced; and therefore, the processing time delay is reduced, and the time variation of the channel is well adapted.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a method for reducing feedback amount and improving system throughput based on limited feedback technology in LTE-A. Background technique [0002] LTE-Advanced is a technical evolution carried out by 3GPP on the basis of LTE in order to meet the requirements of IMT-Advanced. CoMP (Coordinated Multipoint Transmission) technology, as an important part of LTE-Advanced, suppresses or eliminates inter-cell interference to improve cell edge throughput. CoMP transmission schemes can be mainly divided into the following two categories: joint processing technology; cooperative scheduling / beamforming technology. The implementation of these two types of technologies requires the known CSI (Channel State Information) at the sending end. [0003] The receiving end can obtain channel state information through channel estimation technology. The receiving end can fee...

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Problems solved by technology

[0005] In the current wireless communication, on the one hand, the common limited feedback codebook set contains a large number of codewords, and the search complexity during quantization is very large, which increases the system delay and cannot well adapt to the time-varying nature of the channel; on the other hand, On the one hand, the common codebook design method treats the channels of multiple base stations uniformly, which does not make full use of the characteristics of multi-cells, resulting in the inability to better improve the codebook performance

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