Cell-free Massive MIMO and SWIPT: Access Point Operation Mode Selection and Power Control

TL;DR

This paper proposes a joint access point operation mode selection and power control scheme for cell-free massive MIMO systems with SWIPT, optimizing energy harvesting and spectral efficiency in IoT networks.

Contribution

It introduces a novel joint AP mode selection and power control method specifically designed for CF-mMIMO with SWIPT, enhancing energy harvesting and spectral efficiency.

Findings

Achieves up to 76% performance gain over random mode selection.

Achieves up to 130% performance gain with power control.

Effectively balances energy harvesting and spectral efficiency constraints.

Abstract

This paper studies cell-free massive multiple-input multiple-output (CF-mMIMO) systems incorporating simultaneous wireless information and power transfer (SWIPT) for separate information users (IUs) and energy users (EUs) in Internet of Things (IoT) networks. To optimize both the spectral efficiency (SE) of IUs and harvested energy (HE) of EUs, we propose a joint access point (AP) operation mode selection and power control design, wherein certain APs are designated for energy transmission to EUs, while others are dedicated to information transmission to IUs. We investigate the problem of maximizing the total HE for EUs, considering constraints on SE for individual IUs and minimum HE for individual EUs. Our numerical results showcase that the proposed AP operation mode selection algorithm can provide up to $76\%$ and $130\%$ performance gains over random AP operation mode selection with and without power control, respectively.