Codebook designing method for reducing feedback information cost in pre-coding MIMO (Multiple Input Multiple Output) system

A technology of feedback information and design method, applied in the direction of transmission system, digital transmission system, baseband system components, etc., can solve the problems of wasting feedback bandwidth and increasing feedback information overhead

Inactive Publication Date: 2012-10-03
SHANGHAI UNIV
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Problems solved by technology

The disadvantage is that the size of the codebook is fixed, and for time-related channels, a large amount of feedback bandwidth is wasted, which increases the feedback information overhead

Method used

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  • Codebook designing method for reducing feedback information cost in pre-coding MIMO (Multiple Input Multiple Output) system
  • Codebook designing method for reducing feedback information cost in pre-coding MIMO (Multiple Input Multiple Output) system
  • Codebook designing method for reducing feedback information cost in pre-coding MIMO (Multiple Input Multiple Output) system

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Embodiment Construction

[0031] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings: this embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation schemes, operating procedures and experimental results are provided, but the protection scope of the present invention is not limited to Examples described below.

[0032] Such as figure 1As shown, the codebook design method for reducing feedback information overhead in the precoded MIMO system of the present invention, its specific steps are as follows:

[0033] Step 1. The receiver bases on the current channel vector , from the initial codebook Select the best codeword from ,Will The index number is fed back to the transmitter.

[0034] The initial codebook For the Grassmannian codebook, the transmitter and the receiver respectively use the same initial codebook, the said initial codebook from Select the best cod...

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Abstract

The invention discloses a codebook designing method for reducing feedback information cost in a pre-coding MIMO (Multiple Input Multiple Output) system. The method comprises the steps of (1) selecting optimal code words from an initial codebook by a receiver according to the current channel vector, and feeding reference numbers back to an emitter; (2) generating a tapered codebook at the emitter and the receiver according to the initial codebook, the optimal code words in step 1 and contraction-expansion factors; (3) selecting optimal reference numbers from the tapered codebook by the receiver according to the current channel vector, wherein the method for selecting the optimal code words is same as the method for selecting the optimal code word vector in the step 1, and feeding the reference numbers of the optimal code words back to the emitter; and (4) selecting relatively optimal code words (in the code words) according to the current channel information (in the channel information) of the emitter and the receiver, and converting the tapered codebook to the optimal tapered codebook (in the tapered codebook). According to the method, the size of the feeding-back codebook can be changed according to the channel information, and when the same system channel capacity is achieved, the fed-back bandwidth is reduced, and the cost on feed-back information can be reduced.

Description

technical field [0001] The invention relates to a method in the technical field of wireless transmission, in particular to a codebook design method for reducing feedback information overhead in a precoded MIMO system. Background technique [0002] Using multiple antennas on the transmitter and receiver constitutes a multiple-input multiple-output (MIMO: Multiple-Input Multiple-Output) transmission model. The multiple-input multiple-output transmission method can increase the reliability of wireless connections and increase the reliability of wireless communication systems. capacity. In an environment with severe electromagnetic interference, for a root transmit antenna and For a system with only one receiving antenna, the MIMO transmission method increases the channel capacity, which is linearly related to the relatively small number of transmitting antennas and receiving antennas. Therefore, MIMO technology has become the preferred solution for future broadband mobile ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L1/00H04L25/03
Inventor 吴雅婷赵颖颖余菲
Owner SHANGHAI UNIV
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