双向能量协作的中继系统功率分配算法

Power Allocation Algorithm for Relay Systems with Bidirectional Energy Cooperation

在无线中继系统中,考虑源节点和中继节点都是能量采集的,而源与中继之间可以进行能量协作,即可双向传递能量,针对瑞利衰落信道场景以最大化系统吞吐量为目标,联合优化源节点的发射功率、中继节点的发射功率以及传递的能量值,提出了双向能量传递的最优功率分配算法。本文根据场景模型建立了最优化问题,利用凸优化知识求得最优解的形式,假设能量传递无损耗情况下提出了理想功率分配方案;然后以此为基础,在满足能量因果性和数据因果性的条件下,对传递的能量和发送的功率进行优化。仿真结果表明,本文提出的双向能量传递的功率分配算法优于其他的功率分配算法,能有效的提高系统吞吐量。

In wireless relay systems,considering the source and relay nodes are both energy-harvesting and bidirectional energy cooperation is allowed between these nodes,for the scenario of Rayleigh fading channel,a power allocation algorithm was put forward to solve the optimization problem of the systems throughput by jointly optimizing the source and relay transmit power and the amount of energy transferred.In this paper,the system model was firstly established and convex optimization knowledge was used to obtain the optimal solution expression assumption.Ideal power allocation scheme was firstly proposed when assuming that there is no consumption in energy transfer process.Based on the scheme,the transmit power and the energy transferred were optimized again under the causality constraints on both energy and data.The simulation results show that the power allocation algorithm proposed in this paper is superior to other power allocation algorithms and can effectively improve the system throughput.