Adaptive pre-encoding method and device for MIMO system based on codebook

A precoding method and multi-output technology, applied in the field of 3GPP LTE standardization process, can solve the problems of not being able to send spatial correlation changes, not being able to choose the best, etc.
CN101388702AInactive Publication Date: 2009-03-18NTT DOCOMO INC
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
NTT DOCOMO INC
Publication Date
2009-03-18
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a method for self-adaptively pre-coding in a multi-input and multi-output system on the basis of a codebook and a device thereof, wherein the method comprises: obtaining a switching threshold value or a switching threshold value list which are corresponding to the correlation of a sending or receiving space according to the prior value which is obtained by tests under different conditions, selecting one or a plurality of following switches according to the switching threshold value or the switching threshold value list and through combining the correlation of the sending or receiving space: switch between a single user mode and a multi-user mode through combining user number information, switch between a unitary matrix pre-coding mode and a zero-forcing shaped-beam pre-coding mode, switch between a discrete Fourier transformation codebook and Grassmannian codebook and switch between a big codebook and a small codebook which are carried out according to the user number information. The method of the invention can switch MIMO modes, pre-coding methods, codebooks and the codebook size according to environmental changes, and can adopt preferentially.
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Description

technical field

[0001] The present invention relates to the field of 3GPP LTE (Long Term Evolution of Third Generation Partnership Project) standardization process, in particular to a method and device for adaptive precoding in a codebook-based MIMO system. Background technique

[0002] In codebook-based MIMO (Multiple-Input Multiple-Output) transmission systems, the throughput and throughput efficiency of wireless mobile communication systems can be greatly improved by using limited feedback information. Therefore, codebook-based MIMO transmission technology is the most important technology for future mobile communications. One of the ground communication technologies.

[0003] In the 3GPP LTE standardization process, codebook-based MIMO transmission technology mainly involves the following four aspects of technology:

[0004] 1. MIMO transmission mode, such as Figure 1a , 1b As shown, there are two types: SU-MIMO (Single-User MIMO) and MU-MIMO (Multi-User MIMO). [000...

Claims

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