一种基于QoE效用函数的OFDM系统子载波和功率分配算法

摘要

以系统平均用户感受质量QoE(Quality of Experience)为优化目标,提出一种基于QoE效用函数的子载波和功率分配算法.该算法先根据用户需求与实际信道状态对子载波进行分配,将QoE引入效用函数构建中,并以系统平均QoE最大化为目标对子载波进行功率分配,在功率分配过程中使用导数迭代的方法逼近最优的功率分配结果.仿真结果表明,该算法在获得较高系统平均QoE的同时,根据系统功率资源供求情况,平衡考虑了系统、容量以及用户公平性.%This paper, which makes system average QoE as an optimization target, proposes a subcarrier and power allocation algorithm based on QoE utility function in OFDM system. The algorithm allocates the subcarriers based on user demand and channel status first. Then it introduces QoE into utility function and allocates subcarriers power target to maximize the system average QOE value. The proposed algorithm uses iterative differential coefficient approaching method in power allocation, in order to gain the max system average QoE value. Simulation results indicates that the algorithm keeps a high system average QoE value while the system capacity and user fairness are balanced based on the system resources supply - demand relations in OFDM system.