A fast mimo system transmitter precoding method

Abstract

The invention discloses a fast MIMO system transmitting terminal precoding method, comprising the following steps: S1, using SVD technology to decompose a channel matrix to obtain N parallel sub-channels; S2, carrying out power allocation in view of the signal-to-noise ratio gamma i of the ith sub-channel according to a classic injection method to obtain a power allocation matrix sigma CWF; S3, constituting a modulation diversity unitary matrix VM according to a modulation diversity constellation rotation method to reduce the overlap of constellation points; S4, using a product of an original precoding matrix VH in S1, the matrix sigma CWF in S2 and the matrix VM in S3 as a transmitting terminal precoding matrix, namely, G=VH sigma CWFVM, obtaining the precoding method disclosed by the invention, and using the matrix to transmit signals. The fast MIMO system transmitting terminal precoding method disclosed by the invention is used for reducing the precoding computation time cost, improving the mutual information of the channels and meeting the demands of practical application.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a precoding method at a transmitting end of a fast MIMO system. Background technique [0002] Multi-antenna technology refers to a comprehensive technology that uses multiple antennas at the transmitting end or receiving end of wireless communication and combines advanced signal processing technology at the same time. If multiple antennas are used simultaneously at the transmitting end and the receiving end, it is called multiple input multiple output technology (MIMO, Multiple Input Multiple Output). MIMO is a major breakthrough in smart antenna technology in the field of wireless communication. It can use space-time block code and space multiplexing code technology to double the capacity and spectrum utilization of the communication system without increasing the bandwidth. [0003] The precoding technology at the transmitting end of the MIMO system requires the ...

AI Technical Summary

Problems solved by technology

However, these precoding methods have shortcomings, such as channel diagonalization, classical water injection and maximum diversity precoding, although the calculation time is small, the channel mutual information achieved is also small, which is difficult to meet the needs of practical applications; Although exhaustive precoding and optimal precoding achieve large channel mutual information, the calculation time overhead is also large, which is difficult to achieve in practical applications.

Images