Abstract
This paper studies the secrecy performance of an intelligent reflecting surface (IRS)-aided indoor wireless communication where the IRS is capable of adjusting the direction and phase shift of reflected signal on its surface and assists a source to communicate with an authenticated user in the presence of several unauthenticated users, which can be potential eavesdroppers. The goal of this paper is to design a tile-allocation-and-phase-shift-adjustment (TAaPSA) strategy for the IRS to optimize the average secrecy rate (ASR); moreover, the respective secrecy outage probability (SOP) for this TAaPSA is evaluated. To achieve this goal, the ray model and the Rice distribution are adopted to describe the propagation of the IRS's reflected signals and the fading process, respectively. Closed-form analytical expressions for the ASR and the SOP are derived. Using these analytical results, a genetic algorithm (GA) is utilized to find an optimal TAaPSA strategy for the IRS. The accuracy of the analytical results and the improvement in ASR using GA-based TAaPSA strategy are verified by simulation results.
Highlights
The broadcast nature of wireless signals makes it easy to be attacked by eavesdroppers; especially with the fastgrowing number of wireless devices, security in wireless communication has become a critical issue
The simulation results confirmed the accuracy of analytical results and enhancement of the average secrecy rate (ASR) using genetic algorithm (GA)
The obtained simulation results showed that the secrecy performance was remarkably improved with the help of the intelligent reflecting surface (IRS) and provided useful insight into the IRS’s configuration to archive the high security level
Summary
The broadcast nature of wireless signals makes it easy to be attacked by eavesdroppers; especially with the fastgrowing number of wireless devices, security in wireless communication has become a critical issue. The physical layer security (PLS) approach which defines the perfect secrecy rate as the difference in capacities between legitimate and illegitimate users [1] has commonly adopted to evaluate the secrecy performance in recent studies. The work of [4] combined both the jamming signal and a relay-selection method to rise the security advantage from both user’s and eavesdropper’s sides where a relay that assists the communication at the highest perfect secrecy rate was selected to. The works of [5] and [6] applied the maximal ratio combining (MRT) technique at multiple-antenna systems to exploit the spatial diversity at desired users, achieving a higher security capacity. In [7], the effectiveness of different diversity combining techniques, e.g., maximal ratio transmission (MRC) and selection combining (SC), on enhancing the secure communication for multiple-antenna relaying systems was investigated. The conventional approaches in PLS assumed that the wireless environment is uncontrollable and the enhancement in secrecy performance is achieved using more complex device’s hardware and protocols
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