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Reconfigurable Intelligent Surfaces with Reflection Pattern Modulation Beamforming Design and Performance Analysis

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Document pages: 31 pages

Abstract: Recent considerations for reconfigurable intelligent surfaces (RISs) assumethat RISs can convey information by reflection without the need of transmitradio frequency chains, which, however, is a challenging task. In this paper,we propose an RIS-enhanced multiple-input single-output system with reflectionpattern modulation, where the RIS can configure its reflection state forboosting the received signal power via passive beamforming and simultaneouslyconveying its own information via reflection. We formulate an optimizationproblem to maximize the average received signal power by jointly optimizing theactive beamforming at the access point (AP) and passive beamforming at the RISfor the case where the RIS s state information is statistically known by theAP, and propose a high-quality suboptimal solution based on the alternatingoptimization technique. We analyze the asymptotic outage probability of theproposed scheme under Rayleigh fading channels, for which a closed-formexpression is derived. The achievable rate of the proposed scheme is alsoinvestigated for the case where the transmitted symbol is drawn from a finiteconstellation. Simulation results validate the effectiveness of the proposedscheme and reveal the effect of various system parameters on the achievablerate performance. It is shown that the proposed scheme outperforms theconventional RIS-assisted system without information transfer in terms ofachievable rate performance.

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