802.11ax系统中基于OFDMA调度接入的公平性资源分配算法

针对802.11ax系统中基于正交频分多址接入(orthogonal frequency division multiple access, OFDMA)调度接入的上行多用户传输链路, 提出了基于能量效率的公平性子信道匹配和功率分配算法。根据基于能量效率的上行链路模型, 提出资源块(resource unit, RU)数量确定算法和独立子信道匹配与功率分配算法; 进而针对独立分配中频谱利用不足和功率分配不合理的问题, 提出改进的联合子信道和功率迭代分配算法, 通过应用广义分式规划, 改写约束条件并在目标函数中加入惩罚项来松弛整型变量, 进一步用序列凸规划(sequential convex programming, SCP)来求解。仿真结果表明, 通过独立和联合迭代分配功率和子信道, 系统中用户的能量效率相对原有算法得到提升的同时兼顾了用户间的公平性。

Fairness resource allocation algorithm based on OFDMA scheduling access in 802.11ax system

A fairness sub-channel and power allocation algorithm based on energy efficiency is proposed for the uplink of orthogonal frequency division multiple access (OFDMA) system in 802.11ax. According to the uplink model based on energy efficiency, the resource unit (RU) number determination algorithm and separate sub-channel matching and power allocation algorithm are proposed. To solve the problems of insufficient spectrum utilization and unreasonable power allocation in separate allocation algorithm, an improved joint sub-channel and power iterative allocation algorithm is proposed, by using generalized fractional programming, the constraints are rewritten and the penalty term is added to the objective function to relax the integer variables, it is further solved by sequential convex programming (SCP). The simulation results show that the energy efficiency of users in the system is improved compared with the original algorithm through independent and joint iterative allocation of power and sub-channels, and the fairness between users is considered.