Abstract
This paper analyzes the physical layer secrecy (PLS) performance of a hybrid free space optical and radio frequency (FSO/RF) communication system under a modified selection combining scheme. The transmission scheme takes into account secrecy performance as well as diversity gain and ease of implementation. The effects of FSO link, namely the FSO atmospheric turbulence and the FSO receiver pointing error, are included in the analysis while the power amplifier (PA) inefficiency for the RF transmission is considered to have more realistic understandings on the system performance. The exact analytical expressions for the performance indicators including the average secrecy capacity (ASC) and secrecy outage probability (SOP) of the investigated mixed FSO/RF system are derived. The asymptotic SOP analysis reveals useful insights into the performance of the investigated mixed system. Analytical and simulation results are presented to evaluate the PLS performance of the proposed mixed system as well as to compare the performance of other hybrid systems with different setups.
Highlights
Research backgroundThe growing demands for extremely high data rate in the generation mobile systems (5G and beyond) require backhaul links with much higher capacity and reliability relative to previous systems (especially in the context of network densification that makes wired backhaul an expensive solution and of the fact that integrated access backhaul (IAB) solution is officially adopted in 5G standard of 3GPP recently) [1]
The impact of automatic repeat request (ARQ) schemes on the parallel radio/optical configuration was investigated in [12], which showed significant performance improvement with the parallel implementation of both links compared to using only one of the links. It is clear from [6,7,8,9,10,11,12] and the references therein that most existing work on the parallel free space optical and radio frequency (FSO/RF) system has focused on the bit error rate (BER) and connection outage probability (COP) performance
The physical layer secrecy (PLS) performance analysis of a parallel optical and RF setup with selection combining (SC) was conducted in this paper
Summary
The growing demands for extremely high data rate in the generation mobile systems (5G and beyond) require backhaul links with much higher capacity and reliability relative to previous systems (especially in the context of network densification that makes wired backhaul an expensive solution and of the fact that integrated access backhaul (IAB) solution is officially adopted in 5G standard of 3GPP recently) [1]. FSO communication features high-rate and low latency transmission, but it is highly susceptible to the atmospheric conditions and adverse weather effects [2]. It is well accepted by both academia and industry that the point-topoint propagation with extreme narrow divergence of FSO beam makes physical interception and eavesdropping extremely difficult and the chance of an attempted intercept being discovered extremely high, making FSO communication an inherently secure technology [3,4,5,6]. The parallel system uses both optical and radio links for information transmission and it can adjust the use of both links depending on the wireless interference levels and atmospheric conditions [1]
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