Security-Reliability Tradeoff Analysis in Multisource Multirelay Cooperative Networks with Multiple Cochannel Interferers

Weilong Hu,Hongyan Li,Jiangbo Si

doi:10.1155/2018/2379427

Weilong Hu, Hongyan Li + Show 1 more

Open Access

https://doi.org/10.1155/2018/2379427

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Abstract

Cooperative relaying communication is one of the green communication technologies since it shortens the communication distance and saves the transmit power. In this paper, the physical-layer security (PLS) of a multisource multirelay cooperative relaying communication network is investigated by considering the influence of cochannel interference from a security-reliability tradeoff (SRT) perspective. First, the SRT performance is characterized by the outage probability (OP) and the intercept probability (IP). In particular, the IP encountered at the eavesdropper is used to evaluate the security performance, while the reliability performance is analyzed in terms of the OP experienced at the destination. Then, under the impact of multiple cochannel interferers, the intercept probabilities and the outage probabilities of both the conventional direct transmission (DT) strategy and relay selection (RS) strategy are derived in closed-form expressions over Rayleigh fading channels, respectively. Simulation results are provided to validate the theoretical analysis. It is shown that when the OP (reliability) requirement is relaxed, the IP (security) performance improves and vice versa. It confirms that there is an SRT existing between the OP and the IP. Meanwhile, a better SRT performance can be achieved by increasing the number of sources, relays, and cochannel interferers. In addition, it is also shown that the RS strategy generally outperforms the conventional DT strategy in terms of the product of the IP and the OP.

Highlights

With an explosive growth of the number of wireless devices, such as smart phones, tablet computers, and wireless sensors, more and more energy has been consumed by wireless services
A better security-reliability tradeoff (SRT) performance can be achieved by increasing the number of sources, relays, and cochannel interferers
We presented the physical-layer security (PLS) of a multisource multirelay cooperative communication network by considering the influence of cochannel interference from an SRT perspective

Summary

Introduction

With an explosive growth of the number of wireless devices, such as smart phones, tablet computers, and wireless sensors, more and more energy has been consumed by wireless services. The SC can make the transmission from the source node to the legitimate destination node secure while achieving zero mutual information between the source node and malicious eavesdropper node Based on this idea, extensive research efforts have been devoted to improving the SC from an information-theoretic perspective under different scenarios, for example, cooperative relaying [12,13,14,15] and beamforming techniques [16, 17], cooperative jamming (CJ) methods [18,19,20], and multiple-input multipleoutput (MIMO) schemes [21, 22]. It was proved in [27] that in terms of the SRT the multirelay selection scheme outperformed the single-relay one It can been seen from the above works that the PLS of multisource multirelay cooperative networks under the impact of the cochannel interferers is not considered.

The System Model

SRT Performance Analysis over Rayleigh Fading Channels

Simulation Evaluations

Findings

Conclusions