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KSII Transactions on Internet and Information Systems

Security performance analysis of SIMO relay systems over Composite Fading Channels

Jiangfeng Sun, Hongxia Bie, Xingwang Li

Published Jun 30, 2020• 7 citations
Publisher

Abstract

In this paper, we analyze the secrecy performance of single-input multiple-output (SIMO) relay systems over κ-μ shadowed fading channels.Based on considering relay model employing decode-and-forward (DF) protocol, two security evaluation metrics, namely, secure outage probability (SOP) and probability of strictly positive secrecy capacity (SPSC) are studied, for which closed-form analytical expressions are derived.In addition, Monte Carlo results prove the validity of the theoretical derivation.The simulation results confirm that the factors that enhance the security include large ratio of ( ) ,

DOI
10.3837/tiis.2020.06.018

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In this paper, we analyze the secrecy performance of the decode-and-forward (DF) relay system in generalized-K fading channels. In a typical four-node communications model, a source (S) sends confidential information to a destination (D) via a relay (R) using DF strategy in two time slots, while an eavesdropper (E) wants to overhear the information from S to D over generalized-K fading channels. To be more realistic, we assume that E can receive the signals of two time slots, and there is no direct link between S and D because of heavy fading. Based on those assumptions, we derive closed-form expressions for the secrecy outage probability (SOP) and ergodic secrecy capacity (ESC) by using a tight approximate probability density function of the generalized-K model. Furthermore, asymptotic expressions for the SOP and ESC are also derived in the high signal-to-noise ratio region, not only because we can get some insights about SOP and ESC, but also because expressions for SOP and ESC can be simplified significantly. The single relay system is subsequently extended into a multi-relay system, where the asymptotic SOP analysis of three proposed relay selection strategies is investigated. Moreover, the security-reliability tradeoff analysis in the multi-relay system is also presented given that S adopts a constant code rate. Finally, the Monte-Carlo simulation is used to demonstrate the accuracy of the derived closed-form expressions.
Background: Due to the openness of wireless fading channel, it is easy to be disturbed by other transmission signals and noises. Encryption and decryption can guarantee the security of signals, and Physical Layer Security (PLS) which uses the features of fading channels itself to ensure the security of signal transmission has also been widely concerned. In addition, considering the wide applications of κ-μ shadowed distribution model and the advantages of Multiple-Input Multiple- Output (MIMO) technology, the confidentiality over Single-Input Multiple-Output (SIMO) independent κ-μ shadowed model has been studied. Objective: To introduce the factors affecting the confidentiality on SIMO independent κ-μ shadowed model. Methods: Novel representations of the lower bound on SPSC and SOP are deduced over independent κ-μ shadowed model. The method of moment matching to deal with infinite series is adopted. Results: Through theoretical simulation and statistical simulation, the validity of our analysis is verified. We also get the curves for SOP and SPSC when the parameters of the channel change. Conclusion: Under the condition of larger P, large L , large μD, large mDand small kDcan improve the secrecy performance on independent κ-μ shadowed network.