OFDMA系统中最优能效功率分配

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。

Optimal Energy-efficient Power Allocation in OFDMA System

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.