全双工多跳安全中继系统的性能分析

Performance analysis of full-duplex multi-hop secure relay systems

为了解决大规模无线网络或当源节点和目的节点相距较远场景的安全传输问题,提出一种采用波束成形的全双工多跳译码转发(Decode-and-Forward,DF)安全中继系统,考虑迫零发射、最大比合并波束成形技术,推导其在瑞利衰落信道上的平均安全速率(Average Secrecy Rate,ASR)的精确表达式。计算得到的全双工多跳DF安全中继系统ASR和仿真结果吻合,表明全双工多跳DF安全中继系统ASR理论分析的正确性;同时仿真结果表明,目的节点发射、接收天线数的增多可以提升多跳DF中继系统的物理层安全性能,且接收天线数的增多对系统安全性能的提升效果更加显著,而中继节点数的增多会恶化多跳DF中继系统的物理层安全性能。

In order to solve the problem of secure transmission in large-scale wireless networks or scenarios where the source node and the destination node are far away,the full duplex multi-hop decode-and-forward(DF)secure relay systems using beamforming were proposed.Zero-forcing transmission and maximum ratio combining beamforming technologies were considered,and its corresponding exact expression of average secrecy rate(ASR)in Rayleigh fading channels was derived.The numerical calculation and simulation results of the ASR of the full duplex multi-hop DF secure relay systems are consistent,which shows the correctness of the theoretical analysis of the ASR of the full-duplex multi-hop DF secure relay systems.Simulation results also show that the physical layer security performance of multi-hop DF relay systems can be improved by growing the number of transmit and receive antennas of the destination node,and the effect of increasing the number of receiving antennas is more prominent.However,the more the number of relay nodes,the worse the physical layer security performance of the multi-hop DF relay systems.