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Computer Science > Information Theory

arXiv:2109.09267 (cs)
[Submitted on 20 Sep 2021]

Title:Intelligent Reflecting Surfaces and Classical Relays: Coexistence and Co-Design

Authors:Te-Yi Kan, Ronald Y. Chang, Feng-Tsun Chien
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Abstract:This paper investigates a multiuser downlink communication system with coexisting intelligent reflecting surface (IRS) and classical half-duplex decode-and-forward (DF) relay. In this system, the IRS and the DF relay interact with each other and assist transmission simultaneously. In particular, active beamforming at the base station (BS) and at the DF relay, and passive beamforming at the IRS, are jointly designed to maximize the sum-rate of all users. The sum-rate maximization problem is nonconvex due to the coupled beamforming vectors. We propose an alternating optimization (AO) based algorithm to tackle this complex co-design problem. Numerical validation and discussion on the superiority of the coexistence system and the tradeoffs therein are presented.
Comments: To appear in IEEE GLOBECOM 2021 Workshops
Subjects: Information Theory (cs.IT); Signal Processing (eess.SP)
Cite as: arXiv:2109.09267 [cs.IT]
  (or arXiv:2109.09267v1 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.2109.09267

Submission history

From: Ronald Chang [view email]
[v1] Mon, 20 Sep 2021 02:08:06 UTC (112 KB)
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