基于译码转发的全双工多用户对双向中继MIMO系统波束成形算法

Beamforming Scheme for Full-Duplex Multi-pair Two-Way MIMO Relay System with Decode-and-Forward Strategy

全双工系统相比半双工系统对通信容量有很大的提升,但中继处的自干扰问题严重影响全双工系统的性能,而且多个用户间存在的信号泄漏也对系统性能造成影响。文中针对基于译码转发(Decode-and-forward,DF)的全双工多用户对双向中继系统,将用于消除中继自干扰的零空间投影算法(Null-space projection,NSP)与消除多用户对间干扰的迫零(Zero forcing,ZF)和块对角化(Block diagonalization,BD)算法结合,重新设计波束成形矩阵,实现同时消除自干扰和多用户间干扰的目的。仿真结果表明,构造的全双工多用户对双向中继系统可以达到同时消除自干扰与多用户间干扰的目的。

Full-duplex has a great promotion for channel capacity compared with half-duplex,but the interference of relay and the leakage between multi-user affect the performance of communication system.We combine null-space projection(NSP)algorithm used to restrain the self-interference with zero forcing(ZF)and block diagonalization(BD)algorithms used to cancel the interference between different users to restructure beamforming matrixes,thus canceling the self-interference and multi-pair interference in multi-user full-duplex two-way relay system with decode-and-forward(DF)strategy.Simulation resultsreveal that the multi-user full-duplex two-way relay system can restrain the self-interference of relay and the interference between multi-user at the same time.