Two-Timescale Beamforming for IRS-Assisted Millimeter Wave Systems: A Deep Unrolling-Based Stochastic Optimization Approach

Peilan Wang, Jun Fang, Zhuoran Wu, Hongbin Li

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

We study the problem of joint active and passive beamforming for intelligent reflecting surface (IRS)-assisted millimeter Wave (mmWave) communication systems. To relieve from frequent instantaneous channel state information (I-CSI) acquisition, we consider a two-timescale beamforming protocol, in which the reflecting coefficients at the IRS are designed according to the long-term (i.e. statistical) CSI, and the transmit beam- forming matrix is devised based on the instantaneous equivalent channel in a short-term scale. Such a problem is formulated as a stochastic optimization problem. To tackle this highly-coupled non-convex problem, we propose a combined effective channel gain maximization criterion for long-term passive beamforming. Also, a deep unrolling-based method is developed to provide a unified framework to address the stochastic optimization problem. Simulation results show that the proposed two-timescale beamforming methods can approach the performance of the beamforming approach that is based on the I-CSI.

Original languageEnglish
Title of host publication2022 IEEE 12th Sensor Array and Multichannel Signal Processing Workshop, SAM 2022
Pages191-195
Number of pages5
ISBN (Electronic)9781665406338
DOIs
StatePublished - 2022
Event12th IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2022 - Trondheim, Norway
Duration: 20 Jun 202223 Jun 2022

Publication series

NameProceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop
Volume2022-June
ISSN (Electronic)2151-870X

Conference

Conference12th IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2022
Country/TerritoryNorway
CityTrondheim
Period20/06/2223/06/22

Keywords

  • Intelligent reflecting surface
  • millimeter wave communications
  • two-timescale beamforming

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