A Low-Complexity Multiuser Adaptive Modulation Scheme for MRC Receivers in Massive MIMO Systems

Amin Radbord, Mohammed Abdel Hafez, Mohammadreza Amini

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

Abstract

This paper presents a low-complexity adaptive scheme for an uplink multiuser transmission in a massive multiple-input and multiple-output (MIMO) system using maximum-ratio combining (MRC) at the receiver. Instead of using small-scale fast-varying fading, slow-varying large-scale shadowing information is exploited to adapt the desired mode among a discrete set of modulations available at the transmitter side. Since users experience different large-scale fading parameters, the adaptation procedure has to be calculated separately for each user. Therefore, this scheme is called multiuser adaptive modulation (MAM) and is compared to the traditional approach called fast adaptive modulation (FAM), which accounts for small-scale fast-varying fading for adaptation. Furthermore, the closed-form expressions for the average spectral efficiency and bit error outage are derived. In comparison with the FAM scheme and the previous research results, the outcome of this paper shows that at low transmit power, the aforementioned adaptive scheme by the MRC receiver gives a similar performance.

Original languageEnglish
Title of host publicationICUFN 2022 - 13th International Conference on Ubiquitous and Future Networks
PublisherIEEE Computer Society
Pages80-85
Number of pages6
ISBN (Electronic)9781665485500
DOIs
Publication statusPublished - 2022
Event13th International Conference on Ubiquitous and Future Networks, ICUFN 2022 - Virtual, Barcelona, Spain
Duration: Jul 5 2022Jul 8 2022

Publication series

NameInternational Conference on Ubiquitous and Future Networks, ICUFN
Volume2022-July
ISSN (Print)2165-8528
ISSN (Electronic)2165-8536

Conference

Conference13th International Conference on Ubiquitous and Future Networks, ICUFN 2022
Country/TerritorySpain
CityVirtual, Barcelona
Period7/5/227/8/22

Keywords

  • Adaptive modulation
  • large-scale fading
  • massive MIMO
  • maximum-ratio combining
  • power control

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications
  • Hardware and Architecture

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