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Pre-coding method and codebook constructing method based on code book mode

A construction method and precoding technology, applied in the field of multiple-input multiple-output wireless mobile communication systems

Inactive Publication Date: 2009-03-25
ZTE CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a codebook-based precoding method and a codebook construction method to solve the precoding problem of a system with 2 transmitting antennas

Method used

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  • Pre-coding method and codebook constructing method based on code book mode
  • Pre-coding method and codebook constructing method based on code book mode
  • Pre-coding method and codebook constructing method based on code book mode

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Embodiment Construction

[0030] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0031] The precoding based on the codebook method is to select the closest codebook for the V matrix on the basis of using the non-codebook method for precoding.

[0032] The method of codebook construction is as follows.

[0033] For the case of 2 transmitting antennas, since the V matrix is ​​a unitary matrix, the 2×2 V matrix has its own characteristics. According to its properties, the V matrix can be expressed as:

[0034] V = cos ( θ k ) - sin ( θ ...

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Abstract

A construction method of a code book is applicable to a multi-input multi-output system of 2 sending antenna. The method comprises the following steps: dividing a theta k and a phi k to i, j angle values which have same rank and are quantified; respectively substituting the quantified angle values to a V for figuring out a matrix, and the V is indicated in the right; after using the matrix to divide the root of the number N of a data stream which waits for sending, and taking out front N rows of the matrix to get a codebook. After configuring the code book on a sending terminal and a receiving terminal, a pre-coding method which is based the code book manner executes the following steps: the receiving terminal conducts the analysis of singular values on a channel matrix which is acquired through the estimation of a channel so as to get a pre-coding matrix V of the sending terminal; the receiving terminal finds out a code book matrix which is close to the V matrix on the code book which is configured on the receiving terminal, and sends the sequence number of the code book matrix to the sending terminal; the sending terminal obtains a pre-coding matrix from the code book which is configured on the sending terminal according to the received code book matrix sequence number, and uses the pre-coding matrix to conduct the pre-coding on the data stream. The invention has the advantages of enabling the 2 sending antenna to get better performance under the condition of costing a little.

Description

technical field [0001] The invention relates to a multiple-input multiple-output (MIMO) wireless mobile communication system, in particular to a codebook-based precoding method and a codebook construction method. Background technique [0002] The Multiple Input and Multiple Output (MIMO) system has become a technology that has attracted much attention in the research of the LTE (Long Term Evolution System for Third Generation Mobile Communications) because it can effectively increase the channel capacity. Using precoding technology to multiplex between multiple data streams and antennas can make more effective use of existing channel resources, improve system capacity through power allocation to data streams, and reduce interference between data streams, improving system performance. overall performance. Therefore, precoding technology has also become a new research hotspot. [0003] In this part, we will introduce the basic theoretical method and implementation of precodi...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04B7/06H04B1/707H04L1/06
Inventor 郭阳
Owner ZTE CORP
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