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Method and device for tracking precoding matrix

A pre-coding matrix and pre-coding technology, which is applied in the direction of coding, coding components, code conversion, etc., can solve the problems of low performance of MIMO system, reduce the bit error rate of signal transmission, and the actual effect is not ideal, so as to improve the quality of signal transmission, The effect of improving MIMO system performance and reducing bit error rate

Inactive Publication Date: 2009-09-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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Problems solved by technology

However, although the starting point of this method is to hope that the selected precoding matrix can be infinitely close to the theoretical optimal precoding matrix, the actual effect is not ideal.
Then, after using such a precoding matrix to encode the information to be transmitted, the influence of the fading channel on the signal transmission process cannot be effectively eliminated, and the bit error rate of signal transmission cannot be reduced more effectively, so the performance of the MIMO system is low

Method used

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  • Method and device for tracking precoding matrix

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Embodiment 1

[0035]In this embodiment, for the frequency domain, after the precoding codebook is pre-generated according to the space-time processing method adopted by the MIMO system and the tracking amount E is set according to the system performance requirements, each precoding matrix in the precoding codebook is used as the current precoding matrix one by one. Encoding matrix, looking for the matrix with the smallest Euclidean distance to the current precoding matrix 2 E precoding matrices, as the adjacent precoding matrix group of the current precoding matrix; An optimized precoding matrix of the current carrier cluster is selected from the coding matrix group.

[0036] image 3 It is a flow chart of the frequency domain precoding matrix tracking method in this embodiment. see image 3 , the method includes:

[0037] In step 301, a precoding codebook is set according to the space-time processing method adopted by the MIMO system, and a tracking amount E is set according to system ...

Embodiment 2

[0088] This embodiment is aimed at the time domain. Since the channel has a strong correlation within a period of time, the channel state information matrix during this period can be tracked and processed using a continuous precoding matrix. In order to ensure system performance and reduce error diffusion that may be caused by wrong tracking, an exhaustive search of the precoding codebook is performed at regular intervals. This period of time is the cycle in this embodiment, and a cycle includes multiple moments. In practical applications, within one period, the optimized precoding matrix at the previous moment may be used to select the optimized precoding matrix at the current moment.

[0089] In this embodiment, after the precoding codebook is pre-generated according to the space-time processing method adopted by the MIMO system and the tracking amount E is set according to the system performance requirements, each precoding matrix in the precoding codebook is used as the cu...

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Abstract

The invention discloses a method and a device for tracking a precoding matrix. The method comprises the following steps: using a matrix Euclidean distance as a measure to determine an adjacent precoding matrix group for each precoding matrix in a preset precoding codebook; and using the adjacent precoding matrix group corresponding to an optimized precoding matrix selected last time in the domainas a current alternative codebook space, and selecting an optimized precoding matrix for the time from the current alternative codebook space. The device for tracking the precoding matrix comprises acodebook determining module and a tracking module. The precoding tracking proposal of the invention can effectively improve the performance of a system while lower precoding feedback information content is maintained.

Description

technical field [0001] The invention relates to multiple-input multiple-output (MIMO) technology, in particular to a precoding matrix tracking method in the MIMO system. Background technique [0002] Future mobile communication puts forward higher requirements for wireless communication systems in terms of transmission rate, performance and system business capacity. The multiple-input multiple-output (MIMO) system adopts multi-antenna structure at both the transmitting end and the receiving end, not only the system capacity and spectrum utilization rate can be doubled, so as to meet the requirements of high transmission rate and high system service capacity, but also fully The space diversity can be used to improve the performance of the communication system. [0003] Precoding means that the signal to be sent is preprocessed at the sending end, and then the processed signal is sent to the receiving end. Precoding technology is a key technology to improve the performance o...

Claims

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Application Information

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IPC IPC(8): H04L1/06H03M13/00
Inventor 黄海洋武刚雷霞方晓胤吴琪李少谦严春林张战加山英俊
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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