Contents I. Introduction
Energy harvesting (EH) technology is integrated into wireless communication as a powerful solution to the problem of limited network lifetime, which collects energy from natural resources (solar, wind, vibration, etc.) and synthesized resources (microwave power transfer) and transforms into electricity to power wireless equipments [1], [2]. In recent years, simultaneous wireless information and power transfer (SWIPT) has gained a great deal of attention from researchers, which transport both energy and information to destinations by utilizing the same emitted electromagnetic wave [3], [4]. Two practical receiver designs for SWIPT, time splitting (TS) and power splitting (PS) schemes, were proposed for practical SWIPT receiver designs to realize receiving the information and energy simultaneously in [5] and [6]. A dynamic gradient-aware hierarchical packet forwarding mechanism is designed in [7] to extend the SWIPT networks life. The outage and capacity performance of a wireless sensor networks with TS/PS schemes over Nakagami- fading channels was investigated in [8].
