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.

翻译：本文研究了在物联网网络中为分离的信息用户（IU）和能量用户（EU）集成同时无线信息和功率传输（SWIPT）的无蜂窝大规模多输入多输出（CF-mMIMO）系统。为优化IU的频谱效率（SE）和EU的 harvested能量（HE），我们提出了一种联合接入点（AP）工作模式选择与功率控制设计方案，其中部分AP专用于向EU传输能量，其余AP则专用于向IU传输信息。我们研究了在满足各IU的SE约束和各EU的最小HE约束下，最大化EU总HE的问题。数值结果表明，与随机AP工作模式选择（有无功率控制）相比，所提出的AP工作模式选择算法可分别提供高达76%和130%的性能增益。