Security and Reliability Performance Analysis of Cooperative Multi-Relay Systems With Nonlinear Energy Harvesters and Hardware Impairments

Xingwang Li,Mengyan Huang,Jianhe Du,Dan Deng,Khaled M Rabie,Changsen Zhang,Yuan Ding

doi:10.1109/access.2019.2930664

Abstract

In this paper, we investigate the reliability and security performance of cooperative multi-relay systems, where both source and relay nodes are energy-constrained nonlinear energy harvesters, scavenging energy from a power beacon nearby. Our analysis is based on practical model since residual hardware impairments (RHIs) and channel estimation errors (CEEs) are considered. Aiming at improving the system efficiency, three representative relay selection strategies are considered: 1) random relay selection (RRS); 2) suboptimal relay selection (SRS); and 3) optimal relay selection (ORS). To characterize the security performance of the considered strategies, we derive closed-form analytical expressions of the reliability and security in terms of outage probability (OP) and intercept probability (IP). We further discuss the asymptotic expressions and scaling laws of OP with the number of relays. The IP is analyzed for non-colluding and colluding scenarios. The numerical results illustrate that: 1) There is a tradeoff between reliability and security, that is when the outage constraint is relaxed, the IP can be enhanced, and vice versa; ii) The outage performance of the ORS and SRS schemes outperform RRS, indicating that relay selection can enhance reliability performance; iii) There are error floors for the OP due to the CEEs; iv) Colluding eavesdroppers can enhance eavesdropping attacks by sharing their intercepted information; and v) Although RHIs and CEEs have deleterious effects on the OP, they can protect the information transmission against eavesdropping attacks.

Highlights

Cooperative wireless communication networks (WCNs) have been widely used in military, agricultural and industrial fields, The associate editor coordinating the review of this manuscript and approving it for publication was Prabhat Kumar Upadhyay.etc [1]–[6]
MOTIVATION AND CONTRIBUTIONS Motivated by the above observations, we investigate the secure performance of cooperative multi-relay systems with nonlinear energy harvesters and imperfect channel state information (ICSI), where residual hardware impairments (RHIs) at all nodes are taken into account
It can be seen that there are error floors of outage probability (OP) for the proposed three schemes in the presence of RHIs and ICSI, which implies that RHIs and channel estimation errors (CEEs) have a significant negative impact on system outage performance

Summary

INTRODUCTION

Cooperative wireless communication networks (WCNs) have been widely used in military, agricultural and industrial fields, The associate editor coordinating the review of this manuscript and approving it for publication was Prabhat Kumar Upadhyay. A. MOTIVATION AND CONTRIBUTIONS Motivated by the above observations, we investigate the secure performance of cooperative multi-relay systems with nonlinear energy harvesters and ICSI, where RHIs at all nodes are taken into account. MOTIVATION AND CONTRIBUTIONS Motivated by the above observations, we investigate the secure performance of cooperative multi-relay systems with nonlinear energy harvesters and ICSI, where RHIs at all nodes are taken into account Considering these imperfections, three RS strategies are proposed, namely RRS, SRS and ORS. Both non-colluding and colluding eavesdropping scenarios are considered. The results show that RRS is irrelevant to the number of relay, while SRS and ORS can improve the secure performance

ORGANIZATION The rest of the paper is organized as follows

SYSTEM MODEL

INTERCEPT PROBABILITY ANALYSIS

NUMERICAL RESULTS

OUTAGE PROBABILITY

CONCLUSION