中文摘要：

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白干扰信号，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，白干扰抑制效果明显。

英文摘要：

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.