摘要
在全双工多输入多输出(MIMO)中继系统中,中继发送端和接受端之间的自干扰降低了系统的信道容量,严重影响了中继系统的传输性能。从理论上来讲,全双工中继方案的核心问题就是自干扰抑制。通过在中继处设计收发矢量来抑制自干扰信号,但与已有的基于奇异值分解(SVD)的抑制方案不同,研究了一种旨在放大中继收发端有用信号与自干扰信号功率比(SIR)的抑制方法,将收发抑制矢量进行分开设计,通过公式推导,求出最优的收发抑制矢量。仿真结果表明该方案改善了中继系统的信道容量,自干扰抑制效果明显。
Self-interference from the relay transmission to reception in full-duplex MIMO relays reduces the channel capacity and has a negative effect on the relay performance. Theoretically speaking, the core problem of full-duplex MIMO relays is self-interference suppression. In this paper, we propose a novel technique for self-interference suppression. The relay employs transmit and receive weight vectors for suppressing the self-interference signal. Unlike the existing technique that is based on the singular value decomposition. Maximizing the ratio between the power of the useful signal to the self-interference power at the relay reception and transmission and forming a eriterion function for jointly calculating the optimal receive and transmit suppression vectors, respectively. Simulation results confirm that the proposed scheme improves the channel capacity and mitigates the self-interference significantly.
出处
《信号处理》
CSCD
北大核心
2014年第6期655-658,共4页
Journal of Signal Processing
基金
国家自然科学基金(61201213)
关键词
全双工中继
自干扰抑制
收发抑制矢量
full-duplex relays
self-interference suppression
transmit and receive weight vectors
