Multi-user MIMO using ZF-based Multiplexing Coordinated with User-wise Spatial Diversity

Fumiyuki Adachi, Ryo Takahashi

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

Abstract

In this paper, a multi-user MIMO using zeroforcing (ZF)-based multiplexing coordinated with user-wise spatial diversity is proposed assuming time-division duplex (TDD). The downlink and uplink signal-to-noise ratios (SNRs) are analyzed for the given multi-user MIMO channel. It is shown that the downlink capacity is the same for all users while the uplink capacity is not necessarily the same. The closed-form expressions for the downlink and uplink SNRs conditioned on the 2-user virtual MIMO channel are derived. It is shown that the uplink sum capacity is higher than the downlink sum capacity. The downlink and uplink capacities are numerically evaluated by Monte Carlo simulation in a Rayleigh fading environment. It is shown that the link capacity can be improved by increasing the number of user antennas while keeping the ZF matrix size in the same level.

Original languageEnglish
Title of host publication2020 IEEE 92nd Vehicular Technology Conference, VTC 2020-Fall - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728194844
DOIs
Publication statusPublished - 2020 Nov
Event92nd IEEE Vehicular Technology Conference, VTC 2020-Fall - Virtual, Victoria, Canada
Duration: 2020 Nov 18 → …

Publication series

NameIEEE Vehicular Technology Conference
Volume2020-November
ISSN (Print)1550-2252

Conference

Conference92nd IEEE Vehicular Technology Conference, VTC 2020-Fall
CountryCanada
CityVirtual, Victoria
Period20/11/18 → …

Keywords

  • coordinated transmission and reception
  • multi-user MIMO
  • spatial diversity
  • zero-forcing

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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