Communication method and system in multi-input multi-output system

Abstract

The invention discloses a communication method used in a multiple-input and multiple-output system, comprising transmitting antenna combination chosen by the receiving end according to the communication channel conditions, the receiving end sending the transmitting antenna combination information chosen to the sending end and the sending end according to the transmitting antenna combination information received to send signals to the receiving end via the transmitting antenna combination chosen. The invention also discloses a communication system used in the multiple-input and multiple-output system, comprising a sending end and a receiving end. According to the invention, because the receiving end chooses the transmitting antenna that adopts the principle of channel capacity maximization and sends the transmitting antenna chosen to the sending end, the sending end sending signals to the receiving end adopting the transmitting antenna chosen can reach higher transmitting efficiency, or arrives at a lower packet error rate in the receiving end.

Description

technical field [0001] The present invention relates to a communication technology, in particular to a communication method and system in a multiple-input multiple-output system. Background technique [0002] According to information theory, the transmission bit rate of the system can be greatly improved by using multi-antenna arrays at the transmitting end and the receiving end of the communication system, or at both ends. [0003] Figure 1 shows a wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitter and receiver. This system is also called MIMO (Multiple Input Multiple Output) system, and it works in a Rayleigh scattering environment, and each element of the channel matrix can be approximately regarded as statistically independent. In the system shown in FIG. 1, a data sequence can be divided into M uncorrelated symbol subsequences, and each subsequence is transmitted by one of the M transmit antennas. After t...

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Problems solved by technology

[0011] In this way, since the conditions of the channels corresponding to the M transmitting antennas are different, in one TTI, some of the transmitting antennas among the M transmitting antennas have better channel conditions, so that the receiving signal-to-noise ratio at the receiving end is better, while some The channel condition corresponding to the transmitting antenna is relatively poor, so the receiving signal-to-noise ratio at the receiving end is relatively poor

Therefore, in one TTI, all the C M K Combining multiple transmitting antennas to transmit signals cannot make full use of the transmitting antenna combination with better channel conditions to achieve higher transmission efficiency or lower packet error rate at the receiving end.

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