OFDM放大转发中继系统信息与能量同传优化算法研究

Study on Simultaneous Wireless Information and Energy Transfer optimization algorithm in OFDM amplify-and-forward relay systems

信息与能量同传是解决无线通信网络能量受限问题的有效技术.文章针对能量受限无线中继的OFDM放大转发中继系统,研究信息与能量同传的快速优化算法,在提高系统端到端传输速率性能的同时,延长中继结点电池的使用寿命.1研究了OFDM放大转发中继系统的最优能量传输和子载波配对方案;2将信息传输功率分配和能量传输时间优化问题形成为具有非凸目标函数和非凸能量收集约束的非凸优化问题;3通过分式规划问题优化方法和CCCP(Constrained Concave Convex Procedure)方法对该非凸优化问题进行求解,提出了相应的资源分配优化算法.仿真结果表明,与已有算法相比,文章提出的资源分配优化算法可明显提高信息与能量同传OFDM AF中继系统的速率性能.

Simultaneous Wireless Information and Energy Transfer （SWIET） is an efficient technique to solve the energy-constrained problem in wireless communication networks. In this paper, the Simultaneous Information and Energy Transfer in an OFDM amplify-and-forward relay network with an energy-constrained relay is investigated. The goal is to improve the system end-to-end transmission rate and extend the lifetime of the relay＇ s battery. Firstly, the optimal energy transfer policy and subcarrier pairing scheme is studied. Then, the power allocation of information transmission and energy transfer time ratio optimization problem is formulated as a nonconvex problem, where the objective function and the energy-harvesting constraint are both non-convex. By solving the non-convex problem with fractional programming technique and CCCP （ Constrained Concave Convex Procedure） method, the resource allocation optimization algorithm is provided. The simulation results show that our proposed resource allocation scheme can significantly improve the rate performance of SWIET-based OFDM relay networks, compared with the existing resource allocation schemes.