Method for designing code book precoded by multi-input and multi-output system

Abstract

The invention relates to a method for designing a code book precoded by a multi-input and multi-output system. The method comprises the following steps: according to feedback overhead of the code book, setting uniform quantization reference; according to the uniform quantization reference, constructing a first layer of the code book; calculating quantization error of the first layer of the code book; and using the quantization error as input for further quantization so as to obtain a second layer of the code book. Through the treatment of the technical proposal, the method can homogenize the quantization error caused by the limitation of the feedback overhead, thereby obtaining diversity using gain of the code book. In addition, in the presence of redundant information of a channel coding module, the advantage of the method is more obvious under the condition of low coding speed.

Description

technical field The present invention relates to a multiple-input multiple-output (MIMO, Multi-Input Multi-Output) system encoding method in the field of wireless communication, in particular to a codebook (codebook) design method for precoding (Precoding) in the MIMO system. Background technique In the case of limited channel bandwidth, the capacity of the system can be greatly improved by using MIMO technology. The precoding technology is that the sender uses the channel information fed back by the receiver to process the sent data with a precoding matrix, so that each data stream is equivalent to a mutually independent channel for transmission during the spatial channel transmission process. However, if the receiver cannot know the characteristics of the channel (for example, in the FDD mode, or when the channel reciprocity fails in the TDD mode), the channel characteristics need to be obtained through feedback. If the real channel characteristics are fed back, the requ...

AI Technical Summary

Problems solved by technology

In this way, after the receiver estimates the MIMO channel coefficients, it only needs to feed back the label of the corresponding codebook. This method reduces the signaling overhead, but correspondingly reduces the estimation accuracy of the channel coefficients