OFDMA系统资源分配算法研究*

作者：张青波1,2，黄国刚2，何加铭2 日期：2009-11-16/span> 浏览：3510 查看PDF文档

OFDMA系统资源分配算法研究*

张青波1,2，黄国刚2，何加铭2
（1.浙江工商职业技术学院 机电工程学院，浙江 宁波 315012； 2.宁波大学 通信技术研究所，浙江 宁波 315211）

摘要：为解决正交频分多址接入（OFDMA）系统目前存在的子载波、比特和功率等资源的分配算法复杂度高的问题，提出了一种低复杂度的解决方案。其中，比特分配采用香农算法，并给出了优化策略；子载波分配算法利用多用户频率分集来提高信道容量；功率分配算法基于实时性更好的路径损耗补偿法，使得算法的整体复杂度降低，最终实现了系统资源的合理分配。仿真结果表明，采用该算法可以进一步降低系统误码率，提高实时性，同时算法复杂度也有较大降低。
关键词：正交频分多址接入；比特分配；子载波分配；功率分配
中图分类号：TP391.4文献标识码：A文章编号：1001-4551(2009)10-0006-04

Research on resource allocation algorithm for OFDMA system
ZHANG Qingbo1,2, HUANG Guogang2, HE Jiaming2
(1. College of Electrical and Mechanical Engineering, Zhejiang Business Technology Institute, Ningbo 315012, China;
2. Institute of Communication Technology, Ningbo University, Ningbo 315211, China)
Abstract: To solving the problem of present highcomplexity resourceallocation algorithm of bit, subcarrier and power in orthogonal frequency division multiple access(OFDMA) system, a lowcomplexity solution was proposed. Bit allocation used Shannon algorithm, and it was optimized. Subcarrier allocation used multiuser frequency diversity to improve channel capacity. Power allocation algorithm used better realtime pathloss compensation method, and it reduced the overall complexity. At last, the rational allocation of systems resource was realized by the new algorithm. Simulation results show that new resourceallocation algorithm can further reduce the systems biterror rate, improve realtime performance. At the same time, algorithms complexity is greatly reduced.
Key words: orthogonal frequency division multiple access(OFDMA); bit allocation; subcarrier allocation; power allocation
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