Abstract
In this paper, we investigate the physical layer security of cooperative two-way relay transmission systems using the amplify-and-forward (AF) protocol in the presence of an eavesdropper. A joint relay selection (RS) and power allocation (PA) scheme is proposed to protect the source-destination transmission against the eavesdropper. However, due to the high computational complexity, it is difficult to obtain the optimal solution for the system secrecy rate. Fortunately, an approximate optimal solution by using the particle swarm optimization (PSO) algorithm is derived. In the simulations, we use random relay selection with optimal power allocation (RRS-OPA) and equal power allocation with optimal relay selection (EPA-ORS) as benchmark schemes to verify the effectiveness of the proposed method. The simulation results show that the proposed method outperforms both RRS-OPA and EPA-ORS and significantly improves the system performance with low complexity.
Highlights
Cooperative relaying is a promising technology for achieving full spatial diversity, improved network coverage, and system capacity [1,2,3]
In [11], a joint relay selection (RS) and power allocation (PA) algorithm under transmit power and primary use interference constraints is presented in cognitive radio (CR) networks with multiple relays
We assume that the channel state information (CSI) is perfectly known
Summary
Cooperative relaying is a promising technology for achieving full spatial diversity, improved network coverage, and system capacity [1,2,3]. In [16], a cooperative jamming scheme is investigated to improve the system’s secrecy rate for two-way relaying system with an eavesdropper node. A joint RS and PA algorithm with an eavesdropper for two-way relay transmission based on particle swarm optimization (PSO) is proposed to reduce the computational complexity and improve the system secrecy rate. The proposed method based on PSO is investigated to improve the system performance with low complexity under eavesdropping environment. A joint relay selection (RS) and power allocation (PA) scheme is proposed to protect the source-destination transmission against the eavesdropper in the two-way cooperative relaying systems. In order to reduce the computational complexity, we propose the optimization algorithm based on PSO to improve the system secrecy rate.
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