A hierarchical rate splitting strategy for FDD massive MIMO under imperfect CSIT

Mingbo Dai, Bruno Clerckx, David Gesbert, Giuseppe Caire

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

2 Citations (Scopus)

Abstract

In a multiuser MIMO broadcast channel, the rate performance is affected by the multiuser interference when the Channel State Information at the Transmitter (CSIT) is imperfect. To tackle the interference problem, a Rate-Splitting (RS) approach has been proposed recently, which splits one user's message into a common and a private part, and superimposes the common message on top of the private messages. The common message is drawn from a public codebook and should be decoded by all users. In this paper, we propose a novel and general framework, denoted as Hierarchical Rate Splitting (HRS), that is particularly suited to FDD massive MIMO systems. HRS simultaneously transmits private messages intended to each user and two kinds of common messages that can be decoded by all users and by a subset of users, respectively. We analyse the asymptotic sum rate of HRS under imperfect CSIT. A closed-form power allocation is derived which provides insights into the effects of system parameters. Finally, simulation results validate the significant sum rate gain of HRS over various baselines.1

Original languageEnglish
Title of host publication2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks, CAMAD 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages80-84
Number of pages5
ISBN (Electronic)9781467381864
DOIs
Publication statusPublished - 2016 Jan 25
Event20th IEEE International Workshop on Computer Aided Modelling and Design of Communication Links and Networks, CAMAD 2015 - Guildford, United Kingdom
Duration: 2015 Sep 72015 Sep 9

Publication series

Name2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks, CAMAD 2015

Other

Other20th IEEE International Workshop on Computer Aided Modelling and Design of Communication Links and Networks, CAMAD 2015
CountryUnited Kingdom
CityGuildford
Period15/9/715/9/9

Keywords

  • Imperfect CSIT
  • Massive MIMO
  • Rate Splitting

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Computer Networks and Communications

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