Deep learning based antenna selection and CSI extrapolation in massive MIMO systems

Bo Lin, Feifei Gao, Shun Zhang, Ting Zhou, Ahmed Alkhateeb

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A critical bottleneck of massive multiple-input multiple-output (MIMO) system is the huge training overhead caused by downlink transmission, like channel estimation, downlink beamforming and covariance observation. In this paper, we propose to use the channel state information (CSI) of a small number of antennas to extrapolate the CSI of the other antennas and reduce the training overhead. Specifically, we design a deep neural network that we call an antenna domain extrapolation network (ADEN) that can exploit the correlation function among antennas. We then propose a deep learning (DL) based antenna selection network (ASN) that can select a limited antennas for optimizing the extrapolation, which is conventionally a type of combinatorial optimization and is difficult to solve. We trickly designed a constrained degradation algorithm to generate a differentiable approximation of the discrete antenna selection vector such that the back-propagation of the neural network can be guaranteed. Numerical results show that the proposed ADEN outperforms the traditional fully connected one, and the antenna selection scheme learned by ASN is much better than the trivially used uniform selection.

Original languageEnglish (US)
Title of host publication2021 IEEE/CIC International Conference on Communications in China, ICCC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages962-966
Number of pages5
ISBN (Electronic)9781665443852
DOIs
StatePublished - Jul 28 2021
Event2021 IEEE/CIC International Conference on Communications in China, ICCC 2021 - Xiamen, China
Duration: Jul 28 2021Jul 30 2021

Publication series

Name2021 IEEE/CIC International Conference on Communications in China, ICCC 2021

Conference

Conference2021 IEEE/CIC International Conference on Communications in China, ICCC 2021
Country/TerritoryChina
CityXiamen
Period7/28/217/30/21

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems and Management
  • Safety, Risk, Reliability and Quality
  • Instrumentation

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