Pilot Design for Gaussian Mixture Channel Estimation in Massive MIMO

Yujie Gu, Yimin D. Zhang

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

4 Scopus citations

Abstract

Massive multiple-input multiple-output (MIMO) is a promising technique for 5G communications due to its superior spectrum and energy efficiencies. Despite its many advantages, the high number of antennas used in massive MIMO brings many challenges in practical implementations. Among them, the pilot overhead for downlink channel estimation becomes unaffordable in frequency division duplex (FDD) massive MIMO systems. In this paper, we exploit the available a priori knowledge of the channel to optimize the pilot design. By utilizing the low-rank nature of the channel matrix, we first derive the minimum number of pilot symbols required for perfect channel recovery. Further, under the general Gaussian mixture model for the channel vector, the pilot symbols are optimized to maximize the mutual information between the measurements of the user and the corresponding channel vector. Simulation results demonstrate the effectiveness of the proposed optimal pilot design for the downlink channel estimation in FDD massive MIMO systems.

Original languageEnglish
Title of host publication2018 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3266-3270
Number of pages5
ISBN (Print)9781538646588
DOIs
StatePublished - 10 Sep 2018
Externally publishedYes
Event2018 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2018 - Calgary, Canada
Duration: 15 Apr 201820 Apr 2018

Publication series

NameICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume2018-April
ISSN (Print)1520-6149

Conference

Conference2018 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2018
Country/TerritoryCanada
CityCalgary
Period15/04/1820/04/18

Bibliographical note

Publisher Copyright:
© 2018 IEEE.

Keywords

  • Channel estimation
  • Gaussian mixture
  • Massive MIMO
  • Pilot optimization

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