Signal transmission method, system and device of multi-input multi-output (MIMO) system

Abstract

The invention discloses a signal transmission method, system and device of a multi-input multi-output (MIMO) system. The method comprises the following steps: a transmitting end sequentially performs operations of channel coding, interlacing, scrambling and constellation mapping on a signal; the transmitting end performs orthogonal processing on a channel gain matrix in the channel state information fed back by a receiving end, and performs non-linear pre-coding on the signal after the constellation mapping by use of the channel gain matrix after the orthogonal processing; and the transmitting end sends the signal after the non-linear pre-coding to a channel and transmits the signal to the receiving end through the channel. Through the invention, the situation of relatively poor channel conditions can be adapted to, interference among multiple users is reduced, the error rate of the system is reduced, the overall performance of the system is improved, the information overhead is reduced, the power control can be implemented more conveniently, and the requirement of users on fairness can be met.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a signal transmission method, system and device of a multiple-input multiple-output system. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology can double the capacity of wireless channels without increasing system bandwidth and antenna transmission power, and thus becomes a key technology for future wireless communications. [0003] In the downlink of a Multiple-User Multiple-Input Multiple-Output (MU-MIMO) system, a base station communicates with multiple co-channel users on the same time-frequency resource, and there must be co-channel interference. Precoding at the transmitter is an effective solution to the problem of co-channel interference. Current precoding technologies can be divided into linear precoding and nonlinear precoding. Compared with linear precoding, nonlinear precoding has a lower bit error rate and higher capacity. [0004...

AI Technical Summary

Problems solved by technology

[0006] The existing nonlinear precoding schemes have the advantages of simple principle and good practicability, but they all directly process the actual feedback channel matrix. When the channel does not satisfy the column orthogonality, the user receiving noise is amplified to varying degrees, and the user's bit error The rate increases sequentially with the encoding order, so the performance of the users who encode later will be poor, and there may even be the possibility of infinite amplification of noise, which is difficult to meet the fairness requirements of users. At this time, the overall performance of the system will also be seriously affected, and the receiving end The weighting factor value decoded by the user needs to be transmitted from the transmitter to the receiver, which increases the information overhead

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