Reconfigurable Intelligent Surfaces Assisted Communications With Limited Phase Shifts: How Many Phase Shifts Are Enough?
Hongliang Zhang, Boya Di, Lingyang Song, Zhu Han
Abstract
Reconfigurable intelligent surface (RIS) has drawn a great attention worldwide as it can create favorable propagation conditions by controlling the phase shifts of the reflected signals at the surface to enhance the communication quality. However, the practical RIS only has limited phase shifts, which will lead to the performance degradation. In this paper, we evaluate the performance of an uplink RIS assisted communication system by giving an approximation of the achievable data rate, and investigate the effect of limited phase shifts on the data rate. In particular, we derive the required number of phase shifts under a data rate degradation constraint. Numerical results verify our analysis.
Topics & Concepts
Telecommunications linkDegradation (telecommunications)Phase (matter)Computer scienceConstraint (computer-aided design)Electronic engineeringEngineeringTelecommunicationsPhysicsQuantum mechanicsMechanical engineeringAdvanced Wireless Communication TechnologiesUAV Applications and OptimizationOptical Wireless Communication Technologies