Modulation-Based Simultaneous Wireless Information and Power Transfer

Abstract

Due to the rapid growth of IoT and other connected devices, developing battery-less and/or self-sustainable devices to enable green communication is crucial. This letter presents a practical simultaneous wireless information and power transfer (SWIPT) scheme based on an $M$ -ary quadrature-amplitude modulation (QAM) modulation based technique ( ${MS} $ ). The proposed scheme employs hybrid constellation shaping system (HCS) to improve the spectral efficiency. We compare ${MS} $ with the traditional power splitting scheme based SWIPT ( ${PS} $ ) technique. We demonstrate that our proposed scheme outperforms ${PS} $ in terms of the error rate performance. ${MS} $ scheme is mainly focused on improving the reliability of low powered IoT sensors and it offers better achievable information rate at operating SNR region as compared to that of ${PS} $ . Those improvements come at the expense of a slight reduction in the maximum achievable spectral efficiency.