Sum-Rate Maximization for Linearly Precoded Downlink Multiuser MISO Systems with Partial CSIT: A Rate-Splitting Approach

Hamdi Joudeh, Bruno Clercks

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

This paper considers the sum-rate (SR) maximization problem in downlink multi-user multiple input simgle output (MU-MISO) systems under imperfect channel state information at the transmitter (CSIT). Contrary to existing works, we consider a rather unorthodox transmission scheme. In particular, the message intended to one of the users is split into two parts: a common part which can be recovered by all users, and a private part recovered by the corresponding user. On the other hand, the rest of users receive their information through private messages. This rate-splitting (RS) approach was shown to boost the achievable degrees of freedom when CSIT errors decay with increased SNR. In this paper, the RS strategy is married with linear precoder design and optimization techniques to achieve a maximized ergodic SR (ESR) performance over the entire range of SNRs. Precoders are designed based on partial CSIT knowledge by solving a stochastic rate optimization problem using means of sample average approximation coupled with the weighted minimum mean square error approach. Numerical results show that in addition to the ESR gains, the benefits of RS also include relaxed CSIT quality requirements and enhanced achievable rate regions compared with conventional transmission with no rate-splitting.

Original languageEnglish
Pages (from-to)4847-4861
Number of pages15
JournalIEEE Transactions on Communications
Volume64
Issue number11
DOIs
Publication statusPublished - 2016 Nov 1

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Channel state information
Transmitters
Mean square error

Keywords

  • degrees of freedom
  • ergodic sum-rate
  • MISO-BC
  • sample average approximation
  • WMMSE approach

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Sum-Rate Maximization for Linearly Precoded Downlink Multiuser MISO Systems with Partial CSIT : A Rate-Splitting Approach. / Joudeh, Hamdi; Clercks, Bruno.

In: IEEE Transactions on Communications, Vol. 64, No. 11, 01.11.2016, p. 4847-4861.

Research output: Contribution to journalArticle

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