【作者】 胡艳军； 李李；

【Author】 Hu Yanjun Li Li Key Laboratory of Intelligent Computing and Signal Processing,Ministry of Education, Anhui University,Hefei,Anhui,230039,P.R.China

【机构】 安徽大学计算智能与信号处理教育部重点实验室；

【摘要】 本文针对多用户OFDM系统资源分配的基于比例公平性最优化算法复杂度很高、在实际应用中不可解的问题,在系统子信道信噪比高的情况下对比例公平性最优化问题进行简化,提出了一种低复杂度的基于比例公平性的次优化资源分配算法。并进行了实验仿真比较。实验结果表明该算法在保持系统容量性能的同时可降低功率分配的算法复杂度。更多还原

【Abstract】 The utility function is always used for the optimization and achieving the tradeoff between the efficiency and fairness.The proportional fairness optimization problem can be formulated as maximizing the utility function,which is the sum of logarithmic user data rate.However,the optimal proportional fairness problem for resource allocation in Orthogonal Frequency Division Multiplexing(OFDM) system is NP-hard which requires high complexity and could not be realized in practice system.To reduce the complexity of the proportional fairness optimization problem and make the optimization problem tractable,a suboptimal power allocation algorithm based on proportional fairness in multiuser OFDM systems is proposed in this paper.In the case of high signal-to-noise ratio in sub-channel,the proportional fairness optimization could be simplified.A set of simulation experiments are given,simulation results show that the proposed algorithm keeps good performance,but the computational complexity becomes lower.更多还原