Sensors, Vol. 23, Pages 1881: Physical-Layer Security with Irregular Reconfigurable Intelligent Surfaces for 6G Networks

Sensors, Vol. 23, Pages 1881: Physical-Layer Security with Irregular Reconfigurable Intelligent Surfaces for 6G Networks Sensors doi: 10.3390/s23041881 Authors: Emmanuel Obeng Frimpong Bong-Hwan Oh Taehoon Kim Inkyu Bang The goal of 6G is to make far-reaching changes in communication systems with stricter demands, such as high throughput, extremely low latency, stronger security, and ubiquitous connectivity. Several promising techniques, such as reconfigurable intelligent surfaces (RISs), have been introduced to achieve these goals. An RIS is a 2D low-cost array of reflecting elements that can adjust the electromagnetic properties of an incident signal. In this paper, we guarantee secrecy by using an irregular RIS (IRIS). The main idea of an IRIS is to irregularly activate reflecting elements for a given number of RIS elements. In this work, we consider a communication scenario in which, with the aid of an IRIS, a multi-antenna base station establishes a secure link with a legitimate single-antenna user in the presence of a single-antenna eavesdropper. To this end, we formulate a topology-and-precoding optimization problem to maximize the secrecy rate. We then propose a Tabu search-based algorithm to jointly optimize the RIS topology and the precoding design. Finally, we present simulation results to validate the proposed algorithm, which highlights the performance gain of the IRIS in improving secure transmissions compared to an RIS. Our results show that explo...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
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