Phase shift design for RIS-aided cell-free massive MIMO with improved differential evolution

Trinh Van Chien, Cuong V. Le, Huynh Thi Thanh Binh, Hien Quoc Ngo, Symeon Chatzinotas

Research output: Contribution to journalArticlepeer-review


This paper proposes a novel phase shift design for cell-free massive multiple-input and multiple-output (MIMO) systems assisted by reconfigurable intelligent surface (RIS), which only utilizes channel statistics to achieve the uplink sum ergodic throughput maximization under spatial channel correlations. Due to the non-convexity and the scale of the derived optimization problem, we develop an improved version of the differential evolution (DE) algorithm. The proposed scheme is capable of providing high-quality solutions within reasonable computing time. Numerical results demonstrate superior improvements of the proposed phase shift designs over the other benchmarks, particularly in scenarios where direct links are highly probable.

Original languageEnglish
Pages (from-to)1499 - 1503
JournalIEEE Wireless Communications Letters
Issue number9
Early online date24 May 2023
Publication statusPublished - Sept 2023

Bibliographical note

Publisher Copyright:


  • Cell-free massive MIMO
  • Correlation
  • differential evolution
  • Fading channels
  • Massive MIMO
  • Optimization
  • reconfigurable intelligence surface
  • Signal to noise ratio
  • Throughput
  • Uplink

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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