Joint Beamforming Design in Multi-Cluster MISO NOMA Intelligent Reflecting Surface-Aided Downlink Communication Networks

TL;DR

This paper proposes novel optimization algorithms for joint beamforming in IRS-assisted multi-cluster MISO NOMA networks, significantly reducing power consumption and computational complexity compared to traditional methods.

Contribution

It introduces an SOCP-ADMM algorithm for effective joint beamforming and a low-complexity ZF-based suboptimal algorithm for IRS-assisted NOMA systems.

Findings

The SOCP-ADMM algorithm outperforms SDP-based methods in power minimization.

The ZF-based suboptimal algorithm performs well with many IRS elements.

Proposed methods reduce computational complexity while maintaining high performance.

Abstract

Considering intelligent reflecting surface (IRS), we study a multi-cluster multiple-input-single-output (MISO) non-orthogonal multiple access (NOMA) downlink communication network. In the network, an IRS assists the communication from the base station (BS) to all users by passive beamforming. Our goal is to minimize the total transmit power by jointly optimizing the transmit beamforming vectors at the BS and the reflection coefficient vector at the IRS. Because of the restrictions on the IRS reflection amplitudes and phase shifts, the formulated quadratically constrained quadratic problem is highly non-convex. For the aforementioned problem, the conventional semidefinite programming (SDP) based algorithm has prohibitively high computational complexity and deteriorating performance. Here, we propose an effective second-order cone programming (SOCP)-alternating direction method of multipliers (ADMM) based algorithm to obtain the locally optimal solution. To reduce the computational complexity, we also propose a low-complexity zero-forcing (ZF) based suboptimal algorithm. It is shown through simulation results that our proposed SOCP-ADMM based algorithm achieves significant performance gain over the conventional SDP based algorithm. Furthermore, when the number of passive reflection elements is relatively high, our proposed ZF-based suboptimal algorithm also outperforms the SDP based algorithm.