Security Performance Analysis for Best Relay Selection in Energy-Harvesting Cooperative Communication Networks

Abstract

In this paper, we investigate an energy-harvesting cooperative communication network, which comprises of a source, a destination, and multiple decode-and-forward (DF) relays in the presence of multiple passive eavesdropper (Es). Es attempt to intercept confidential information transmissions from the source to destination via DF relays. In this network, all the DF relays harvest energy from radio-frequency (RF) signals of a source through time-switching receivers. In order to improve the physical layer security of energyharvesting cooperative communication networks, we propose a best relay selection (BRS) scheme, where the ''best'' relay is chosen to assist the source-destination transmission. For the purpose of comparison, we consider the classic direct transmission (DT) and equal relay selection (ERS) as benchmark schemes. We derive the exact closed-form expressions of outage probability (OP) and intercept probability (IP) for the ERS and BRS schemes over Rayleigh fading channels. Besides, the security-reliability tradeoff (SRT) is analyzed as a metric to evaluate the tradeoff performance of the proposed BRS scheme. Numerical results show that the SRT of the BRS scheme consistently outperforms that of the ERS scheme, which demonstrates the advantage of our proposed scheme against eavesdroppers. Besides, it is verified that total error rate (TER) defined as the sum of OP and IP can be minimized for both the ERS and BRS schemes through changing the time allocation factor between information transmission and energy harvesting phases. Moreover, there is a best energy conversation efficiency to obtain a maximal SRT value of the ERS and BRS schemes. In addition, as the number of DF relays increases, the SRT of BRS scheme improves notably, while that of ERS scheme remains unchanged. And as the number of Es increases, the SRT of both the ERS and BRS schemes become worse. INDEX TERMS Cooperative communication, physical layer security, best relay selection (BRS), outage probability (OP), intercept probability (IP), security-reliability tradeoff (SRT).

On the performance of energy harvesting‐assisted Nth best relay cooperative networks in Nakagami‐m fading

“…In literature, the performance of radio frequency (RF)-EH-assisted relay networks have been analyzed in previous studies. 2,[17][18][19][20][21][22][23][24] Hoang et al 2 have given the outage probability (OP) for dual-hop RF EH-assisted AF and DF relay networks considering PRS scheme and SC receiver over Nakagami-m distributed channels. In Mohjazi et al, 17 a dual-hop simultaneous wireless information and power transfer (SWIPT) relay network with power splitting (PS) and time switching (TS) receiver architectures have been considered and then authors have derived the amount of fading (AoF), OP, achievable throughput, and average symbol error rate (ASER) for the non-coherent modulation schemes and asymptotic expressions using moment-based approach over Rayleigh fading channels.…”

“…For a dual-hop EH-based AF relay system, new expressions of average channel capacity (ACC) and ASER have been presented in Illi et al 19 considering MRC receiver with PS and TS EH protocols. Considering a DF relaying-based cooperative dual-hop network with RF EH capability and using TS protocol over Rayleigh distributed channels, the authors have derived the achievable ACC and OP in Biswas et al 20 Also, for cooperative DF and AF relaying networks, the authors have proposed a novel EH-assisted adaptive PS protocol and derived the average achievable channel capacity, as well as OP expressions in Ashraf et al 21 Considering a DF cooperative relay network with multiple passive eavesdroppers having RF EH capability, the authors have investigated the exact expressions of the intercept probability and OP in Zhang et al 22 for BR selection in Rayleigh fading scenario. The OP for the SWIPT-based DF cooperative relay network has been investigated in Tin et al, 23 considering static and optimal dynamic PS protocols with PRS scheme over Rayleigh distributed channels.…”

“…In literature, the performance of radio frequency (RF)‐EH‐assisted relay networks have been analyzed in previous studies 2,17–24 . Hoang et al 2 have given the outage probability (OP) for dual‐hop RF EH‐assisted AF and DF relay networks considering PRS scheme and SC receiver over Nakagami‐ distributed channels.…”

“…Also, for cooperative DF and AF relaying networks, the authors have proposed a novel EH‐assisted adaptive PS protocol and derived the average achievable channel capacity, as well as OP expressions in Ashraf et al 21 . Considering a DF cooperative relay network with multiple passive eavesdroppers having RF EH capability, the authors have investigated the exact expressions of the intercept probability and OP in Zhang et al 22 for BR selection in Rayleigh fading scenario. The OP for the SWIPT‐based DF cooperative relay network has been investigated in Tin et al, 23 considering static and optimal dynamic PS protocols with PRS scheme over Rayleigh distributed channels.…”

Research on Comprehensive Evaluation of Data Source Quality in Big Data Environment

“…Since the birth of big data, people have gradually realized the social and economic value of big data and paid great attention to it [1][2][3]. Many developed countries have successively issued relevant policies to promote the development of big data, and have promoted big data as a national strategy [4][5][6].…”