直传链路干扰下全双工中继传输方案

Transmission Scheme for Full-duplex Relay System with Direct Link

对于直传链路和自干扰(Self-interference,SI)影响下的全双工(Full-duplex,FD)中继系统,在各个链路进行连续速率传输的前提下,研究了有缓冲辅助和无缓冲辅助两种中继协作下的系统性能。在译码转发(Decode and Forward,DF)模式下,建立了以吞吐量为目标的优化问题。对于无缓冲辅助中继直接求解得到了自适应功率分配方案,对于缓冲辅助中继,提出了利用一种新型利用直传链路增益的传输模式,由功率限制条件及缓冲器状态稳定条件,根据KKT条件求解得到了系统任意时刻最佳传输方案,仿真结果表明根据所提出方案进行信息传输可以获得更高吞吐量。

For the full-duplex（ FD） relay system under the influence of direct transmission links and self-interference（ SI）,the transmission strategy of the traditional and buffer-aided relaying cooperative communication system is studied.In the decode and forward（DF） mode,an optimization problem with throughput as the goal is established.For the traditional relay,the problem is directly solved.For the buffer-aided relay,a new transmission mode exploiting the benefit of the direct link is proposed,which considers the power limiting condition and the buffer status stability condition.The problem is solved with KKT conditions to obtain the optimal transmission scheme at any time of the system.The simulation results show that the system can achieve higher throughput using the proposed strategy.