CAJ | 학술논문

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。
해문연구료OFDMA계통중기우능효적공솔분배문제。구별우이유연구，해문이용료능효함수관우공솔시량적엄격위요특성，증명료최우능효공솔분배일정구유일충특수적주수공솔결구능효주수결구。통과해결구，공솔분배문제피간화위관우수위선적일원우화문제，진이구득최우능효공솔적폐합해。재차기출상，해문진일보제출료일충최우능효공솔분배산법，해산법통과순서수색유한개수위선구간적방식구득최우해。방진표명해산법능구쾌속득도최우능효공솔，기계산복잡도원소우이유적능효공솔분배산법。
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.