Design of a novel wireless information surveillance scheme assisted by reconfigurable intelligent surface

Abstract

This paper investigates a novel wireless information surveillance scheme assisted by reconfigurable intelligent surface (RIS) beamforming and artificial noise jamming cooperation, aiming at monitoring the information sent by an access point (AP) to a suspicious illegal user (SIU). It is assumed that the AP adopt the fixed maximum ratio transmission (MRT) precoding scheme, which is not affected by the information monitoring party. The goal of this paper is to maximize the effective information monitoring rate by jointly optimizing the RIS phase shifts, the receive beamforming vector of the legitimate receiver (LR), and the transmit beamforming vector along with jamming power of the jamming antenna (JA). The resultant optimization problem is non-convex, and its optimization variables are highly coupled in the objective function and constraints. To tackle this difficulty, the optimization variables are optimized under the alternate optimization (AO) framework. Especially, the intractable RIS phase shifts are optimized by using Riemannian manifold optimization (RMO) algorithm under the penalty dual decomposition (PDD) framework and the semidefinite relaxation (SDR) technique, respectively. Numerical results verify the effectiveness of the proposed algorithms, and also demonstrate the superiority of the designed wireless information surveillance scheme over other benchmark schemes.

Joint user and throughput maximization in re‐configurable intelligent surface assisted beyond 5G/6G networks

“…Re-configurable intelligent surface (RIS) has the capability to adjust the transmission direction and strength of electromagnetic waves in a flexible manner. 7 The RIS is characterized by a large amount of economical passive reflecting units and an intelligent controller. RIS's performance idea is linked to that of the aperture antenna.…”

Phase Optimization for Massive IRS-Aided Two-Way Relay Network

“…I N traditional communication systems, wireless environment is uncontrollable, which will have a great impact on the quality of communication service [1]- [6]. Due to its ability to intelligently reconfigure the wireless channel environment, intelligent reflecting surface (IRS) has attracted [7]- [10]. To achieve an intelligent wireless environment created by IRS, how to combine IRS and existing wireless technology is crucial.…”