基于译码转发的混合星地中继网络的安全容量分析

Secrecy outage analysis on DF-based integrated satellite-terrestrial relay networks

针对星地融合网络的安全问题,提出了一种实现安全传输的波束形成方案。首先,基于卫星-中继链路的瞬时信道状态信息以及中继-用户链路的统计信道状态信息,以最大化安全传输速率为目标,同时满足中继最大发射功率约束,建立一个优化问题。然后,利用矩阵分析、瑞利熵理论等数学工具解决这个优化问题,从而得到最优的中继天线接收和发射权重以及中继发射功率。为了进一步分析该方案的安全性能,推导了系统的遍历安全速率的解析表达式。最后,通过仿真,证明提出的安全传输方案可有效提高网络的安全性能。

Aimed at the secure transmission problems of integrated satellite terrestrial relay networks,a BF algorithm for realizing physical layer security is proposed.Firstly,an optimization problem is established to maximize the secure transmission rate while meeting the maximum transmit power constraints of the relay in the scene based on the instantaneous channel state information of satellite-relay link and the statistical channel state information of the relay-user links.Then,by using the mathematical tools for matrix analysis and Rayleigh quotient theory,the optimization problem can be solved,and the optimal relay antenna receiving and transmitting weights and the relay transmitting power are obtained.To illustrate the security performance of integrated satellite terrestrial relay networks with the scheme,the analytic expression of the ergodic secrecy rate is derived.Finally,the simulation results confirm that the proposed scheme can effectively improve the security performance of the integrated satellite terrestrial relay networks.