Precoding for Uplink RIS-Assisted Cell-Free MIMO-OFDM Systems with Hardware Impairments

Navid Reyhanian; Reza Ghaderi Zefreh; Parisa Ramezani; Emil Bjornson

Precoding for Uplink RIS-Assisted Cell-Free MIMO-OFDM Systems with Hardware Impairments

Signal Processing 2025-10-21 v1

Authors: Navid Reyhanian , Reza Ghaderi Zefreh , Parisa Ramezani , Emil Bjornson

Abstract

This paper studies a reconfigurable intelligent surface (RIS)-assisted cell-free massive multiple-input multiple-output (CF-mMIMO) system with multiple RISs. Joint design of transmit precoding, RIS coefficients, and receive combining is investigated for uplink sum-rate maximization under in-phase and quadrature phase imbalance (IQI) at user equipments (UEs) and access points (APs). A weighted minimum mean squared error (WMMSE) based block coordinate descent (BCD) approach is proposed, where novel iterative methods are developed to efficiently solve the BCD subproblems. The efficiency of proposed approaches is demonstrated relative to heuristic methods via extensive simulations.

Keywords

reconfigurable intelligent surface massive mimo cell-free massive mimo

Cite

@article{arxiv.2510.17741,
  title  = {Precoding for Uplink RIS-Assisted Cell-Free MIMO-OFDM Systems with Hardware Impairments},
  author = {Navid Reyhanian and Reza Ghaderi Zefreh and Parisa Ramezani and Emil Bjornson},
  journal= {arXiv preprint arXiv:2510.17741},
  year   = {2025}
}

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