全双工中继可以提高频谱利用率，但其存在的自反馈干扰信号影响了全双工系统的性能。目前大部分研究主要集中于单向全双工中继系统，对双向全双工中继系统的研究甚少。因此文中在目前单向全双工中继系统的自干扰抑制方案基础上，研究了双向全双工中继系统自干扰消除方法。双向全双工中继与单向全双工中继系统的不同之处在于：除了中继端，其源端和目的端均存在自干扰。对于源节点和目的节点的自干扰采用时域抵消法，再将零空间投影法运用于双向全双工MIMO中继系统来消除中继节点处的自干扰信号。%Full-duplex relay can improve spectrum efficiency,but the loop-interference existed in full-duplex relay affects the perform-ance of the full duplex system. At present most of the research mainly focuses on one-way full-duplex relay system,however,the number of study on two-way full-duplex relay system is few. The loop-interference suppression method of two-way full-duplex relay systems is studied based on that of one-way full-duplex relay systems. The difference between two-way full-duplex relay and one-way full-du-plex MIMO relay is its’ source node and destination node also exist loop-interference. The loop-interference suppression of the relay a-dopts the null-space projection,and applies time-domain cancellation to the source node and destination node.
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