OFDMA系统中最优能效功率分配  

Optimal Energy-efficient Power Allocation in OFDMA System

作　　者：吴凡[1] 毛玉明[1] 黄晓燕[1] 冷甦鹏[1] 

机构地区：[1]电子科技大学通信与信息工程学院,成都611731

出　　处：《电子与信息学报》2014年第7期1673-1679,共7页Journal of Electronics & Information Technology

基　　金：国家科技重大专项(2013ZX03001023);国家863计划项目(2012AA 011402);新世纪优秀人才支持计划(NCET-10-0294)资助课题

摘　　要：该文研究了OFDMA系统中基于能效的功率分配问题。区别于已有研究,该文利用了能效函数关于功率矢量的严格伪凹特性,证明了最优能效功率分配一定具有一种特殊的注水功率结构—能效注水结构。通过该结构,功率分配问题被简化为关于水位线的一元优化问题,进而求得最优能效功率的闭合解。在此基础上,该文进一步提出了一种最优能效功率分配算法,该算法通过顺序搜索有限个水位线区间的方式求得最优解。仿真表明该算法能够快速得到最优能效功率,其计算复杂度远小于已有的能效功率分配算法。This paper focuses on the energy-efficient power allocation in OFDMA systems. Different from the existing work, this paper proves that the optimal energy-efficient power allocation must have a special water-filling structure, named energy-efficient water-filling structure, by exploiting the strict pseudo-concavity of the energy efficiency function with respect to the power vector. Applying the energy-efficient water-filling structure, the original issue is simplified to a single-variable issue, and the closed-form optimal solution is further obtained. Based on the theoretical analysis, an optimal energy-efficient power allocation algorithm is proposed, where the optimal solution is achieved by sequentially searching within a finite number of water-level intervals. The simulation results demonstrate that the proposed algorithm achieves the optimal solution with significantly lower computational complexity compared with the conventional iterative methods.

关 键 词：无线通信 能效 功率分配 能效注水结构 严格伪凹 KKT充分必要条件 

分 类 号：TN92[电子电信—通信与信息系统]