Physical layer security of single‐input multiple‐out relay networks over Beaulieu‐Xie fading channels

With the progress of communication technology, the increasing wireless devices are hooked up the networks, and the consequent security problems cannot be ignored. At present, the solutions mainly include secret key system and physical layer security (PLS). However, secret key system that relies on highly complex algorithms for encryption and decryption still has the risk of being cracked by powerful computers. In this paper, the PLS of Beaulieu‐Xie fading channels is studied. To improve the transmission quality and support higher speed data transmission, the single‐input multiple‐out (SIMO) system considered is the Wyner eavesdropper model with decoding and forwarding (DF) relay over Beaulieu‐Xie fading. The closed‐form theoretical formulas for secure outage probability (SOP) and strictly positive secrecy capacity (SPSC) are obtained by complex unified functional representation, which includes two cases: LRD≤LRE${L_{RD}} \le {L_{RE}}$ and LRD>LRE${L_{RD}} > {L_{RE}}$. Moreover, the theoretical formulas are verified by Monte Carlo results. By comparing the simulation results with the theoretical analysis, the authors discussed the factors to improve the secure performance. Experiments show that the larger ratio of (λRD,λRE)$( {{\lambda _{RD}},{\lambda _{RE}}} )$, the smaller ratio of (mRD,mRE)$( {{m_{RD}},{m_{RE}}} )$, smaller signal‐to‐noise ratio (SNR) of eavesdropping channels, smaller threshold Cth${C_{th}}$ and more legitimate antennas LRD${L_{RD}}$ are beneficial to the improvement of anti‐interference capability for the relay networks with Beaulieu‐Xie distributions when the legal channel link R→D is in a state of high SNR.

The single‐input multiple‐out (SIMO) system considered is the Wyner eavesdropper model with decoding and forwarding (DF) relay over Beaulieu‐Xie fading. The two performance evaluation indicators of secure outage probability (SOP) and strictly positive secrecy capacity (SPSC) are used to investigate the security performance of the wireless communication networks (WCN). In addition, the authors mainly discussed the factors that affect the confidentiality performance.