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.

Inactive Publication Date: 2009-03-18
NTT DOCOMO INC
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Problems solved by technology

[0037] The purpose of the present invention is to provide a method and device for adaptive precoding in a multiple-input multiple-output system, which solves the problem that the prior art cannot change between different user modes and in different user modes according to changes in the number of users and transmission spatial correlation. Switching between precoding methods, between different codebooks, and between different codebook sizes, the technical problem of not being able to choose the best

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

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[0105] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0106] The present invention can determine different switching threshold values ​​or switching threshold value lists according to different channel types, and the channel types include: TU, VA, VB and so on. The method proposed below is a quasi-static switching method, and the switching interval is, for example, 100 ms.

[0107] The spatial correlation on which the present invention determines the handover threshold value can be both the sending spatial correlation and the receiving spatial correlation. The following mainly takes the sending spatial correlation as an example to illustrate three kinds of switching, and the receiving spatial correlation The basic principle of performing three kinds of switching is the same as that of transmitting spat...

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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.

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...

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Application Information

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IPC IPC(8): H04B7/06
CPCH04L2025/03426H04L2025/03414H04L25/03343
Inventor 朱剑驰刘竞秀佘小明陈岚
Owner NTT DOCOMO INC
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