携能网络中保障能效的缓存队列中继选择与能量分配方案

在无线携能（SWIPT）网络中，带有缓存队列的一对半双工SWIPT中继可以在一个时隙内完成信息同时收发，实现虚拟全双工通信。针对SWIPT虚拟全双工网络的资源分配问题，该文研究了缓存队列机制的最佳SWIPT中继选择与子载波能量分配方案。首先建立数学模型，参考注水因子辅助搜索算法，以最大化能效为目标，在满足能量、信息传输速率、最佳接收中继干扰等多个约束条件下，通过求解优化问题选择SWIPT最佳转发中继，同时得到最佳转发中继的子载波能量分配最优解。仿真结果表明，与最大化端到端可达速率为目标的联合资源分配算法相比，所提方案考虑了SWIPT网络中继间干扰。且当源端发送功率较大时，所提方案可以获得较高的能效。 

Energy-efficiency Priority Based Buffer-aided Relay Selection and Power Allocation Strategy in SWIPT Network

In simultaneous wireless information and power transfer (SWIPT) network, a pair of half-duplex buffer-aided relay can simultaneously transmit and receive information within one time slot, which implements virtual full-duplex communication. Aiming at the resource allocation problem in virtual full-duplex SWIPT network, optimal buffer-aided relay selection and subcarrier power allocation strategy in SWIPT network is investigated. Firstly, mathematical model is constructed with the reference of water-filling factor aided search algorithm. With the target of energy-efficiency maximization, the proposed scheme solves optimal problem to choose the best SWIPT forward relay with the consideration of multiple constraint conditions such as power, information transmit rate, as well as the interference of the chosen optimal receive relay. The optimal solution of subcarrier power allocation for the best SWIPT forward relay is obtained. Simulation results show that, compared with the joint resource allocation algorithm that aims to maximize end-to-end achievable rate, the proposed strategy takes SWIPT inter-relay interference into account. Moreover, the proposed strategy obtains higher energy efficiency with larger transmit power at the source.