能量采集中继系统中基于中继选择的时间优化分配算法

Time allocation algorithm based on relay selection in energy-harvesting cooperative network

针对具有能量采集功能的多中继系统,文中提出了一种能够提升系统平均吞吐量性能的基于中继选择的时间分配优化算法。该算法中中继节点工作在无线能量传输(WET)的能量采集模式下,基于能量因果性和数据因果性的限制,构建了系统端到端吞吐量最大化的优化模型。采用分支定界法对每一个时隙所使用的中继节点进行选择。针对中继节点对剩余能量不同的使用情况,分别采用单纯形法和独立求解法对每个时隙中源节点和中继节点的传输时间进行最优分配,以提高目的节点接收到的数据量。仿真结果表明,提出的中继选择和时间分配算法可以有效提升系统的平均吞吐量。

A time allocation algorithm based on relay selection is proposed to improve the system average throughput performance in a wireless cooperative network with multiple relay nodes. In the algorithm, re- lay nodes are used in energy harvesting with wireless energy transfer （WET）. The optimization problem is formulated to maximize the system total end-to-end throughput on the constraint of energy and data cau- sality. The branch and bound method is used to select the relay node for each time slot. According to the different usages of the relay node to the remaining energy, by using simplex method and independent so- lution method, the transmission time of the source node and the relay nodes in each time slot is optimized to increase the amount of data received by the destination node. Simulation results show that the algorithm can efficiently improve the system average throughput.