Keywords :
Cell-free massive MIMO; differential evolution; reconfigurable intelligence surface; Cell-free; Cell-free massive multiple-input and multiple-output; Correlation; Differential Evolution; Fadings channels; Massive multiple-input and multiple-output; Multiple input and multiple outputs; Optimisations; Reconfigurable; Reconfigurable intelligence surface; Uplink; Control and Systems Engineering; Electrical and Electronic Engineering
Abstract :
[en] This letter 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.
Funding text :
This research is funded by Hanoi University of Science and Technology (HUST) under project number T2022-TT-001. The work of Hien Quoc Ngo was supported by the U.K. Research and Innovation Future Leaders Fellowships under Grant MR/X010635/1. The work of Symeon Chatzinotas was supported by the Luxembourg National Fund (FNR)-RISOTTI the Reconfigurable Intelligent Surfaces for Smart Cities under Project FNR/C20/IS/14773976/RISOTTI
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