基于分组内时间切换的无线信息与功率中继传输

Wireless Information and Power Relaying with In?Block Time Switching

研究了采用译码转发机制的无线供电中继网络的能量与信息传输。与常规译码转发中继网络不同,本文在能量受限的中继节点上配置能量收集单元和可充电电池。在进行信息转发之前,中继节点对收集到的能量进行累积。同时,提出了一种基于分组内时间切换的收集—传输—存储模式,在每一传输分组内进行基于时间切换的无线能量与信息传输。通过将有限容量电池的能量水平建模为具有两步状态转移的有限状态马尔科夫链,给出了收集—传输—存储模式在Nakagami?m衰落信道下的中断概率闭合式。仿真结果表明:相比未采用分组内时间切换的收集—传输—存储模式,本文所提机制极大地提高了中断性能和成传速率。

This paper investigates a wireless-powered relay network,in which a source transmits its signal to a destination with the aid of a decode-and-forward(DF)relay.Contrary to conventional DF relay networks,we consider the scenario that the DF relay has no sufficient embedded energy supply,and it is equipped with an energy harvesting unit and rechargeable battery.As such,it can accumulate the energy harvested from the source's signals before help forwarding the information.A harvest-transmit-store(HTS)model with in-block time switching(TS)is developed such that TS can be implemented within one transmission block.By modeling the finite-capacity battery of the relay as a finite-state Markov Chain with a two-stage state transition,we derive the closed-form expression for the outage probability of the proposed HTS model with in-block TS over Nakagami-m fading channels.Numerical results validate our theoretical analysis and show that the proposed HTS model with in-block TS significantly outperforms the HTS model without in-block TS in terms of outage probability and successful rate.