On Physical-Layer Security of FDA Communications Over Rayleigh Fading Channels
On Physical-Layer Security of FDA Communications Over Rayleigh Fading Channels
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瑞利衰落通道上 FDA 通信的物理层安全
DOI：
10.1109/tccn.2019.2906896
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发表时间：
2019-09-01
影响因子：
8.6
通讯作者：
Zhang, Shunsheng
中科院分区：
文献类型：
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作者：
Ji, Shilong;Wang, Wen-Qin;Zhang, Shunsheng
本文研究了频率分集阵列(FDA)天线在物理层安全方面的性能，并分析了在独立但不一定相同的分布式瑞利衰落信道上的系统性能(即平均保密容量和保密中断性能)。针对FDA天线的时变特性，提出了一种单天线多通道接收机结构。发射机将其部分功率分配给发送人工噪声(AN)，以确保通信的安全性，使得除期望接收器的信道之外的信道被降级。具体地，我们分别推导了平均保密容量、非零保密容量概率和保密中断概率的闭合表达式。通过仿真验证了所提分析的正确性。此外，还分别给出了高信干噪比(SINR)下的平均保密容量和保密中断概率的渐近表达式，以深入了解所考虑的系统的性能。数值结果表明，FDA通信方案在距离维方面明显优于相控阵(PA)方案。
In this paper, we investigate frequency diverse array (FDA) antenna for physical-layer security and analyze the system performance (i.e., average secrecy capacity and secrecy outage performance) over independent but not necessarily identical distributed Rayleigh fading channels. A single-antenna multiple-channel receiver structure is proposed to address the time-variance property of FDA antenna. The transmitter allocates part of its power to send artificial noise (AN) so as to ensure the security of communications, such that the channels other than the desired receiver’s are degraded. Specifically, we derive the closed-form expressions for average secrecy capacity, probability of nonzero secrecy capacity, and secrecy outage probability, respectively. The correctness of the proposed analysis is corroborated via simulations. Furthermore, the corresponding asymptotic expressions for average secrecy capacity and secrecy outage probability in high signal-to-interference-plus-noise ratio (SINR) regime are also provided, respectively, to have deep insights into the performance of the considered system. Numerical results show that the FDA communications significantly outperforms the phased-array (PA) scheme in range dimension for secure communication.