Reconfigurable Intelligent Surface Enhanced NOMA Assisted Backscatter Communication System

TL;DR

This paper introduces a RIS-enhanced NOMA backscatter communication system, formulates a joint optimization problem, and proposes an efficient algorithm, demonstrating improved performance over traditional systems.

Contribution

It presents the first joint optimization framework for RIS-assisted NOMA backscatter communication and develops a low-complexity algorithm for phase and power reflection optimization.

Findings

RIS-NOMABC outperforms conventional NOMABC systems

The proposed algorithm effectively optimizes phase shifts and reflection coefficients

Numerical results validate the system's feasibility and enhanced performance

Abstract

A reconfigurable intelligent surface (RIS) enhanced non-orthogonal multiple access assisted backscatter communication (RIS-NOMABC) system is considered. A joint optimization problem over power reflection coefficients and phase shifts is formulated. To solve this non-convex problem, a low complexity algorithm is proposed by invoking the alternative optimization, successive convex approximation and manifold optimization algorithms. Numerical results corroborate that the proposed RIS-NOMABC system outperforms the conventional non-orthogonal multiple access assisted backscatter communication (NOMABC) system without RIS, and demonstrate the feasibility and effectiveness of the proposed algorithm.