Open Access

ARTICLE

Outage Behaviors of Active Intelligent Reflecting Surface Enabled NOMA Communications

by Zhiping Lu¹, Xinwei Yue^2,*, Shuo Chen², Weiguo Ma¹

1 School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, State Key Laboratory of Wireless Mobile Communications, China Academy of Telecommunications Technology (CATT), Beijing, China
2 School of Information and Communication Engineering, Beijing Information Science and Technology University, Beijing, 100101, China

* Corresponding Author: Xinwei Yue. Email:

(This article belongs to the Special Issue: Recent Advances in Backscatter and Intelligent Reflecting Surface Communications for 6G-enabled Internet of Things Networks)

Computer Modeling in Engineering & Sciences 2023, 137(1), 789-812. https://doi.org/10.32604/cmes.2023.027663

Received 08 November 2022; Accepted 16 December 2022; Issue published 23 April 2023

Abstract

Active intelligent reflecting surface (IRS) is a novel and promising technology that is able to overcome the multiplicative fading introduced by passive IRS. In this paper, we consider the application of active IRS to non-orthogonal multiple access (NOMA) networks, where the incident signals are amplified actively through integrating amplifier to reflecting elements. More specifically, the performance of active/passive IRS-NOMA networks is investigated over large and small-scale fading channels. Aiming to characterize the performance of active IRS-NOMA networks, the exact and asymptotic expressions of outage probability for a couple of users, i.e., near-end user and far-end user are derived by exploiting a 1-bit coding scheme. Based on approximated analyses, the diversity orders of user and user are obtained for active IRS-NOMA. In addition, the system throughput of active IRS-NOMA is discussed in the delay-sensitive transmission. The simulation results are carried out to verify that: i) The outage behaviors of active IRS-NOMA networks are superior to that of passive IRS-NOMA networks; ii) As the reflection amplitude factors increase, the active IRS-NOMA networks are capable of furnishing the enhanced outage performance; and iii) The active IRS-NOMA has a larger system throughput than passive IRS-NOMA and conventional communications.

---

Keywords

---