Literature Database Entry

dogim2026statistical

Ghadir Dogim, Ahmed El-Mahdy and Falko Dressler, "Statistical CSI-Based Joint Optimization for Passive RIS-Aided Cell-Free MIMO Systems," Proceedings of 9th International Conference on Networking, Intelligent Systems & Security (NISS 2026), Málaga, Spain, April 2026.

Abstract

This paper addresses the problem of maximizing the downlink sum-rate in passive Reconfigurable Intelligent Surface (RIS)-assisted Cell-Free MIMO (CF-MIMO) networks. To mitigate the considerable overhead associated with acquiring instantaneous Channel State Information (CSI), a low-overhead optimization framework that relies solely on statistical CSI is proposed. A tractable expression for the sum spectral efficiency is first derived, based on statistics obtained from Minimum Mean Squared Error (MMSE) channel estimation. The resulting optimization problem is non-convex and involves the joint design of Access Point (AP) transmit power and RIS phase shifts. To efficiently solve this problem, an Alternating Optimization (AO) scheme is developed to decompose it into two subproblems: power allocation, addressed via the Weighted Minimum Mean Squared Error (WMMSE) algorithm, and phase-shift optimization, tackled using a model-driven Projected Gradient Ascent (PGA) approach. Simulation results demonstrate that the proposed framework significantly enhances both spectral and energy efficiency compared to existing baseline methods, while ensuring rapid convergence and improved system reliability, thereby validating the effectiveness of the statistical CSI-driven design.

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Ghadir Dogim
Ahmed El-Mahdy
Falko Dressler

BibTeX reference

@inproceedings{dogim2026statistical,
    author = {Dogim, Ghadir and El-Mahdy, Ahmed and Dressler, Falko},
    title = {{Statistical CSI-Based Joint Optimization for Passive RIS-Aided Cell-Free MIMO Systems}},
    publisher = {IEEE},
    address = {M{\'{a}}laga, Spain},
    booktitle = {9th International Conference on Networking, Intelligent Systems \& Security (NISS 2026)},
    month = {4},
    year = {2026},
   }
   
   

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Last modified: 2026-04-27