On the Effective Rate of NOMA in Underlay Spectrum Sharing

TL;DR

This paper analyzes the delay-constrained performance of multi-antenna NOMA spectrum sharing systems over Rayleigh channels, deriving analytical expressions for the sum effective rate considering various system parameters and channel information levels.

Contribution

It provides new analytical expressions for the sum effective rate of multi-antenna NOMA spectrum sharing systems under delay constraints and interference limitations.

Findings

Channel state information significantly affects system performance.

Number of antennas and users impact the sum effective rate.

Analytical results closely match simulation data.

Abstract

In this paper, we present the delay-constrained performance analysis of a multi-antenna-assisted multiuser non-orthogonal multiple access (NOMA) based spectrum sharing system over Rayleigh fading channels. We derive analytical expressions for the sum effective rate (ER) for the downlink NOMA system under a peak interference constraint. In particular, we show the effect of the availability of different levels of channel state information (instantaneous and statistical) on the system performance. We also show the effect of different parameters of interest, including the peak tolerable interference power, the delay exponent, the number of antennas and the number of users, on the sum ER of the system under consideration. An excellent agreement between simulation and theoretical results confirms the accuracy of the analysis.