解码转发双向无线携能全双工中继系统的能效研究

Energy Efficiency Research of Decode-and-forward Two-way Simultaneous Wireless Information and Power Transfer Full-duplex Relay System

为了优化双向单中继全双工系统的能效,在中继节点引入无线携能技术,提出了一个双向无线携能全双工中继系统。该系统中继节点以功率分割方式进行能量收集,将收集的能量用于解码转发,在保证用户的服务质量需求下,将能效优化问题转化为能量消耗最小的优化问题,依据传输时隙以及各时隙信道容量需求进一步划分为两个子优化问题;然后,以能效最大化为目标,根据各时隙的信道容量求出传输功率,利用解码转发特性求出传输时间和功率分割因子,得出能效最优解。仿真表明,所提出的双向无线携能全双工中继系统的能效是单向无线携能全双工系统的1.3倍、双向全双工放大转发中继系统的2倍和双向全双工解码转发中继系统的2.6倍。

In order to optimize the energy efficiency of the two-way single-relay full-duplex system,simultaneous wireless information and power transfer technology was introduced at the relay node,and a two-way simultaneous wireless information and power transfer full-duplex relay system was proposed.The energy was collected by the relay node of the system in a power split mode,and the collected energy was used for decode-and-forward.Under the guarantee of the user’s service quality requirements,the energy efficiency optimization problem was transformed into an optimization problem with minimum energy consumption.According to the transmission time slot and the channel capacity requirements of each time slot,it was further divided into two sub-optimization problems.Then,with the goal of maximizing energy efficiency,the transmission power was calculated according to the channel capacity of each time slot,and the transmission time and power split factor were calculated using the decode-and-forward characteristics,thus the energy efficiency optimal solution was obtained.Simulation shows that the energy efficiency of the proposed two-way simultaneous wireless information and power transfer full-duplex relay system is 1.3 times that of the one-way simultaneous wireless information and power transfer full-duplex system,2 times that of the two-way full-duplex amplify-and-forward relay system and 2.6 times that of the two-way full-duplex decode-and-forward relay system.