A Relay-aided Information and Power Transfer Protocol Based on Time Switching Structure in SWIPT

Aiming at the low energy consumption of equipment and the long life cycle of network environment, wireless information and energy simultaneous transmission technology has emerged as one of the novel green transmission technologies in wireless communication. Green simultaneous wireless information and power transfer（SWIPT）network is taken as the research background, SWIPT relays that provided with energy harvesting are introduced in this paper. Time switching (TS) based relay-aided information and power transfer scenario and mathematical model are presented. A relay-aided information and power transfer protocol based on TS structure and the corresponding SWIPT relay receiver structure are designed. Outage performance (OP) and energy-efficiency (EE) performance are analyzed, and the effect of TS factor to OP and EE performance are presented respectively. Numerical results show that, in order to guarantee OP and EE performance in SWIPT, the source should transmit signals with optimum power. The tradeoff between information transmission and energy harvesting in SWIPT can be achieved consequently.