Analyzing Physical-Layer Security of PLC Systems Using DCSK: A Copula-Based Approach

连接词(语言学) 计算机科学 计量经济学 数学
作者
Vinay Mohan,Aashish Mathur,Georges Kaddoum
出处
期刊:IEEE open journal of the Communications Society [Institute of Electrical and Electronics Engineers]
卷期号:4: 104-117 被引量:15
标识
DOI:10.1109/ojcoms.2022.3232753
摘要

This study analyzes the physical layer security (PLS) performance of a differential chaos shift keying (DCSK) modulation-based Power Line Communication (PLC) system by exploiting the novel Farlie-Gumbel-Morgenstern (FGM) Copula approach. A power line Wyner's wiretap channel model is investigated, where the main channel and the wiretap channel are assumed to be correlated and Log-normally distributed. The Gamma approximation to the Log-normal distribution is employed to simplify the computation. Concurrently, the PLC channel noise is modeled as a Bernoulli-Gaussian random process. Utilizing a Copula based approach to model the dependence among the correlated PLC channels, the PLS performance of the PLC system is evaluated in terms of the secure outage probability (SOP) and the strictly positive secrecy capacity (SPSC). It is revealed through the asymptotic SOP analysis that the secrecy diversity order depends on the shaping parameter $(m_{\gamma _{M}})$ of the main channel. We also propose an algorithm to maximize the secrecy throughput under SOP constraints. Based on the insights from this analysis, it has been seen that the SOP performance degrades when the value of the dependence parameter $(\theta)$ increases. Also, the secrecy throughput performance improves with a lower optimal threshold value of the signal-to-noise ratio (SNR), $\gamma _{\textrm {th}}$ . Furthermore, some other insightful observations are presented by studying the impact of different parameters such as spreading factor $(\beta)$ , impulsive noise occurrence probability $(p)$ , transmitted power $(P_{T})$ , and impulsive noise index $(K)$ .
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