中文说明：多用户正交频分复用 （亩 OFDM） 是一种有前途的技术实现高下行链路能力在未来的移动电话和无线局域网系统。总和能力木 ofdm 技术是最大化每个子信道分配给用户提供最好的渠道噪时那子载波与功率随后分发由充水的比率。然而，公平用户之间一般不能实现这项计划。在本文中，我们订下的一套比例公平约束，以保证每个用户可以实现系统所需的数据速率与服务质量保证。因为约束的公平性问题的最优解是极其复杂的计算来获得，我们提出了一种低复杂度的次优算法，分配和功率分配，子流道分离。在该算法中子流道的分配第一次进行假定平等的权力分配。然后一种最优功率分配算法在保持符合比例公平原则的同时，最大限度地的总容量。结果表明，该的算法要在两个用户的系统中，实现约 95 ％ 的优化能力，同时减少从复杂性指数对线性信道数目。它还表明与拟议的资源总容量分配算法被分布式的更公平及灵活者比的总和能力最大化的方法。
English Description：
Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique forachieving high downlink capacities in future cellular and wireless LAN systems. The sum capacityof MU-OFDM is maximized when each subchannel is assigned to the user with the best channel-tonoiseratio for that subchannel, with power subsequently distributed by water-filling. However, fairnessamong the users cannot generally be achieved with such a scheme. In this paper, we impose a set ofproportional fairness constraints to assure that each user can achieve a required data rate, as in a systemwith quality of service guarantees. Since the optimal solution to the constrained fairness problem isextremely computationally complex to obtain, we propose a low-complexity suboptimal algorithm thatseparates subchannel allocation and power allocation. In the proposed algorithm, subchannel allocationis first performed by assum