On the Impact of Phase Shifting Designs on IRS-NOMA

TL;DR

This paper investigates how different phase shifting strategies in IRS affect the performance of IRS-assisted NOMA, highlighting tradeoffs between reliability and complexity through analysis and simulations.

Contribution

It introduces and compares two phase shifting designs, random and coherent, analyzing their impact on IRS-NOMA performance and tradeoffs.

Findings

Coherent phase shifting improves reliability over random shifting.

Different phase designs offer distinct tradeoffs between complexity and performance.

Simulation results validate analytical predictions.

Abstract

In this letter, the impact of two phase shifting designs, namely random phase shifting and coherent phase shifting, on the performance of intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) is studied. Analytical results are developed to show that the two designs achieve different tradeoffs between reliability and complexity. Simulation results are provided to compare IRS-NOMA to conventional relaying and IRS assisted orthogonal multiple access, and also to verify the accuracy of the obtained analytical results.