Multi-input/multi-output system based communication method and device

Abstract

The invention relates to a wireless communication field and discloses a communication method based on a multi-input and multi-output system and a device thereof. The invention has robustness to fading conditions of a channel so that an MIMO system can present the relatively satisfying performance at both high speed and low speed. In the invention, according to current channel state, a receiver selects an optimal pre-coding matrix and feeds back information representing the prepared coding matrix to a sender; the sender carries out orthogonal space-time coding for the information which needs to be transmitted and multiples the pre-coding matrix represented by the information which is fed back by the receiver to transmit; the receiver multiples conjugated transposition of the pre-coding matrix used by the sender by the received signal and after the orthogonal space-time coding is carried out, the information which needs to be transmitted by the sender is obtained. Besides, the invention also provides a practical method for designing a pre-coding code book and selecting an optimal code word matrix from the code book.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a communication technology based on multiple input and multiple output. Background technique [0002] Multiple Input Multiple Output (Multiple Input Multiple Output, referred to as "MIMO") technology is to achieve high data rate, high system capacity, high transmission in the third generation mobile communication (The Third Generation, referred to as "3G") and future mobile communication systems important means of quality. At present, space-time transmit diversity technology has become one of the key technologies of Beyond 3G ("B3G") / 4G. Transmit diversity can improve system capacity and organically combine coding and modulation diversity technologies. [0003] In order to improve the performance of the MIMO system, there are currently two technical solutions. [0004] One scheme uses orthogonal space-time coding. Orthogonal space-time coding, as an open-loop transmit dive...

AI Technical Summary

Problems solved by technology

[0006] The problem with closed-loop diversity techniques is that they perform poorly at high speeds

On the one hand, the feedback information itself cannot be guaranteed to be correctly transmitted to the sending end; on the other hand, the channel changes too fast to make the feedback information invalid, thus degrading the high-speed performance

[0007] Another problem of closed-loop diversity technology is how to design the precoding codebook and how to select the optimal codeword matrix from the codebook. In the current public literature, there is no better method

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