基于能量效率的OFDMA系统资源分配

研究了OFDMA(正交频分多址)系统优化能量效率的资源分配方法,提出了一种基于能量效率的速率比例公平资源分配算法。首先在各子载波等功率的假设条件下为各个用户进行子载波分配,然后求得满足速率比例公平条件下的各用户注水线间的函数关系,再将用户和系统速率要求作为约束条件,采用二分法对函数求解,得到近似最优能量效率下的用户注水线,最后根据用户注水线进行功率分配。仿真结果表明,与其他方案相比,该算法在保持用户速率比例公平性的同时能有效提高系统的能量效率,且复杂度较低。

Resource Allocation for OFDMA System Based on Energy Efficiency

In this paper,we studied the resource allocation method of OFDMA (Orthogonal Frequency Division Multiple Access) system to optimize energy efficiency,and proposed a rate proportional fairness resource allocation algorithm based on energy efficiency.At first,sub carrier allocation for each user under the assumption that the power is equal to each sub carrier is carried out .Then,the functional relationship between each user waterline that satisfies the condition of the rate proportional fairness is gotten.Then,the user and system rate requirements are used as constraints,the dichotomy is used to solve the function,and the user waterline under the optimal energy efficiency is gotten.Finally,powerallocation is carried out according to the user waterline.The simulation results show that the proposed algorithm can effectively improve the energy efficiency of the system while maintaining the rate proportional fairness of the user,and the complexity is low compared with other schemes.