MF中继选择系统的物理层安全性能

doi:10.11959/j.issn.1000-0801.2021213

摘要/Abstract

摘要：

针对合谋窃听场景下单天线多中继修改转发（MF）协作无线系统的安全性能较差问题，提出一种合谋窃听场景下联合源节点发送天线选择（TAS）和多中继选择的MF协作物理层安全系统，考虑最优的最大化主信道信噪比（SNR）和次优的最大化源节点-中继节点链路 SNR 两种中继选择方案，推导其安全中断概率（SOP）和遍历安全容量（ESC）的解析表达式。最优或次优中继选择的MF安全中继系统的SOP和ESC的数值计算结果与仿真结果相吻合，验证了上述理论分析的正确性；同时也表明源节点发射天线数和中继节点数越多、窃听节点数越少，最优或次优中继选择的MF安全中继系统的物理层安全性能越好。

关键词: 发送天线选择, 中继选择, 物理层安全, 修改转发, 安全中断概率, 遍历安全容量

Abstract:

Aimed at the poor security performance of single antenna multi-relay modify-and-forward (MF) cooperative wireless systems in collusion eavesdropping scenario, MF cooperative physical layer security systems combining source node transmit antenna selection (TAS) and multi-relay selection in collusion eavesdropping scenario were proposed.Two relay selection schemes were considered, namely, the optimal maximization of the main channel signal-to-noise ratio (SNR) and the suboptimal maximization of the source-relay link SNR.The closed-form expressions of the secrecy outage probability (SOP) and ergodic secure capacity (ESC) for the above MF cooperative wireless systems were derived.The numerical results of SOP and ESC of MF secure relay systems with optimal or suboptimal relay selection were consistent with the simulation results, which verifies the correctness of the above theoretical analysis.It also shows that the more the number of transmit antennas at the source node and relay nodes, and the less the number of eavesdropping nodes, the better the physical layer security performance of MF secure relay systems with optimal or suboptimal relay selection.

Key words: transmit antenna selection, relay selection, physical layer security, modify-and-forward, secrecy outage probability, ergodic secrecy capacity

中图分类号:

TN918.1

程英, 李光球, 沈静洁, 韦亮. MF中继选择系统的物理层安全性能[J]. 电信科学, 2021, 37(9): 95-104.

Ying CHENG, Guangqiu LI, Jingjie SHEN, Liang WEI. Physical layer security performance of MF relay selection systems[J]. Telecommunications Science, 2021, 37(9): 95-104.

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符号含义	符号表示
源节点发射天线数	M
窃听节点个数	N
中继节点个数	K
S→R_k 链路平均SNR	1/α_k
S→D链路平均SNR	1/α _D
S→E_n链路平均SNR	1/α_n
R→D链路平均SNR	1/β