Multi-user downlink transmission method based on spatial modulation of receiving end

Abstract

The invention discloses a multi-user downlink transmission method based on the spatial modulation of a receiving end, for mainly solving the problem that in a multi-user downlink communication system, a base station needs to transmit information to multiple users of a cell at the same time. The method comprises the steps of solving a pre-coding matrix by a base station in a conjugate transpose matrix manner; performing spatial modulation based on the receiving end on transmitted information and performing perturbation on the obtained information, and then multiplying by the pre-coding matrix to obtain the modulated information; then broadcasting the modulated information to K users by the base station; and at last demodulating the modulated information transmitted by the base station by the K users through maximum likelihood, and thereby completing downlink transmission. The multi-user downlink transmission method based on the spatial modulation of the receiving end has the advantages of being low in computing complexity, simple in design of the receiving end, and capable of obtaining greater bit error rate performance gain, and is particularly applicable to the multi-user MIMO system when the quantity of transmission antennas configured by the base station is large.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a multi-user downlink transmission method, which can be applied to realize the information transmission between a base station and multiple users in a cell at the same time. Background technique [0002] In multi-user multiple-input multiple-output MIMO systems, user resources, as an important wireless resource, have attracted more and more attention, especially considering the fact that the number of users in a cell is greatly increasing in the next generation wireless communication system. Therefore, the multi-user downlink transmission method in the MIMO communication system has also become an important research content. [0003] In the article "Anovel precoding scheme for downlink multi-user spatial modulation system" (IEEE International Symposium on PIMRC, London, 2013), XueruLi et al. disclosed a multi-user transmission method based on the spatial modulation tec...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the signal detection at the user end is a single-user multi-antenna signal detection problem, so the complexity of the receiving end is still high

The disadvantage of this method is that when the number of antennas configured by both the transceiver and the transmitter is large, the computational complexity is high, the bit error performance is poor, and the receiver complexity is high, resulting in poor transmission performance

Images