一种无线携能通信系统中的中继协议

A relaying protocol for simultaneous wireless information and power transfer system

无线携能通信技术的出现为解决节点能量受限问题提供了可能性。在无线携能通信系统中,中继节点通过无线射频(RF)信号获得能量,利用所获得的能量来转发信息。本文研究了基于放大转发(AF)中继的三节点无线携能通信系统,考虑中继端电路能耗的存在,在功率分配(PS)中继协议的基础上提出了开关型功率分配(OPS)中继协议,并推导了该协议下系统中断概率与吞吐量的表达式。仿真结果表明:在该协议下,系统的中断概率与中继端电路能耗无关,系统的吞吐量随着电路能耗的增大而降低。

The emergence of simultaneous wireless information and power transfer technology provides the possibility to solve the problem of energy constrained node. In the simultaneous wireless information and power transfer system,the relay node first harvests energy through radio-frequency( RF) signals,then uses the harvested energy to forward the information. With the consideration of circuit power at relay,this paper considers the three-node simultaneous wireless information and power transfer system based on amplify-and-forward( AF) relaying. On the basis of power splitting protocol( PS),an on-off power splitting( OPS) relaying protocol is proposed,and the expressions of system outage probability and throughput in this protocol are derived. The simulation results show that the system outage performance has no relationship to relay circuit power,and the throughput decreases as circuit power increases.