AF中继下多用户OFDM系统能效优化算法  

Energy-efficient resource allocation algorithm based on AF relay in multi-user OFDM systems

作　　者：张倩[1] 朱琦[2] 

机构地区：[1]南京邮电大学教育部宽带无线通信与传感网技术重点实验室,江苏南京210003 [2]南京邮电大学江苏省无线通信重点实验室,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2015年第4期55-60,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家重点基础研究发展计划("973"计划)(2013CB329005);国家自然科学基金(61171094)资助项目

摘　　要：为解决多用户OFDM(正交频分复用)系统的资源分配问题,文中以能量效率最大化为优化目标,提出一种能效优化算法。首先引入分数规划Dinkelbach算法,将分式目标函数转换成整式凸规划函数,降低运算复杂度,其次利用对偶方法进一步推导出基站端与中继端功率独立受限情况下各子载波的功率分配。仿真结果表明,该算法在保证一定码元速率的前提下,能够获取更好的能效,提升了整个系统性能。The problem of resource allocation strategy in multi-user OFDM systems is studied and an energy efficient optimization algorithm is proposed for maximizing the energy efficiency. The problem is divided into two steps. Firstly, the fractional programming algorithm is used to transform the resulting non-convex optimization problem into an equivalent optimization problem, thus reducing the computational complexity. Secondly, the optimal power allocation on subcarriers at source and relay is achieved by a dual decomposition theorem, with respect to separate transmit power constraints. Simulation results show that the proposed algorithm can obtain the maximum available energy efficiency. Meanwhile, a system capacity is performed.

关 键 词：正交频分复用 能量效率 多用户分集 功率优化 

分 类 号：TN911.7[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]