On Energy-Efficient Passive Beamforming Design of RIS-Assisted CoMP-NOMA Networks

TL;DR

This paper explores energy-efficient passive beamforming strategies in RIS-assisted CoMP-NOMA networks, proposing two configurations and demonstrating significant efficiency improvements over traditional systems.

Contribution

It introduces two novel RIS configurations for passive beamforming and formulates an optimization problem for maximizing energy efficiency in CoMP-NOMA networks.

Findings

RIS-assisted CoMP-NOMA outperforms traditional systems in efficiency.

Optimal PBF design depends on BS count, RIS elements, and configuration.

Significant energy efficiency gains demonstrated through analysis.

Abstract

This paper investigates the synergistic potential of reconfigurable intelligent surfaces (RIS) and non-orthogonal multiple access (NOMA) to enhance the energy efficiency and performance of next-generation wireless networks. We delve into the design of energy-efficient passive beamforming (PBF) strategies within RIS-assisted coordinated multi-point (CoMP)-NOMA networks. Two distinct RIS configurations, namely, enhancement-only PBF (EO) and enhancement & cancellation PBF (EC), are proposed and analyzed. Our findings demonstrate that RIS-assisted CoMP-NOMA networks offer significant efficiency gains compared to traditional CoMP-NOMA systems. Furthermore, we formulate a PBF design problem to optimize the RIS phase shifts for maximizing energy efficiency. Our results reveal that the optimal PBF design is contingent upon several factors, including the number of cooperating base stations (BSs), the number of RIS elements deployed, and the RIS configuration. This study underscores the potential of RIS-assisted CoMP-NOMA networks as a promising solution for achieving superior energy efficiency and overall performance in future wireless networks.