首页 | 本学科首页   官方微博 | 高级检索  
     

基于效益函数值的OFDM无线网络公平子载波分配
引用本文:孙立新,郭坤祺,贾世楼,赵俊毅.基于效益函数值的OFDM无线网络公平子载波分配[J].哈尔滨工业大学学报,2008,40(9):1382-1386,1442.
作者姓名:孙立新  郭坤祺  贾世楼  赵俊毅
作者单位:1. 哈尔滨工业大学,通信技术研究所,哈尔滨,150001;哈尔滨理工大学,测控技术与通信工程学院,哈尔滨,150080
2. 哈尔滨工业大学,通信技术研究所,哈尔滨,150001
摘    要:为改善OFDM无线网络下行链路子载波分配的公平性,本文将最优的子载波问题建模为最大化总体效益函数,并提出了一个新的基于联合层动态子载波分配算法(DSA).根据使用导频序列信号和指数加权低通时间滤波器窗口分别估计的用户子载波信道状态和数据队列长度,该算法根据最大总体时延效益的影响值作出子载波分配决定.与传统方法相比,由于充分利用了多用户分集特性,本文提出的算法能够取得更好的时延有效性和公平能,而且,通过采用不同的效益函数来有限地降低时延性能,该算法在用户负载增加时仍能够提供好的公平性稳定区,仿真结果与数学模型分析相一致.

关 键 词:子载波  OFDM  效益函数  联合层

Fair subcarrier allocation based on utility function value in OFDM wireless networks
SUN Li-xin,GUO Kun-qi,JIA Shi-lou,ZHAO Jun-yi.Fair subcarrier allocation based on utility function value in OFDM wireless networks[J].Journal of Harbin Institute of Technology,2008,40(9):1382-1386,1442.
Authors:SUN Li-xin  GUO Kun-qi  JIA Shi-lou  ZHAO Jun-yi
Affiliation:1(1.Communication Research Center,Harbin Institute of Technology,Harbin 150001,China;2.School of Measurement Control Technology and Communication Engineering,Harbin University of Science and Technology,Harbin 150080,China)
Abstract:The optimal subcarrier allocation is formulated as the maximized total utility function to improve the fairness in downlink subcarrier allocation in OFDM wireless networks.A new algorithm for dynamic subcarrier allocation(DSA) is proposed based on the joint layer optimization.DSA makes the decision for subcarrier allocation according to the maximum weight of the total delay utility using pilot signals and low exponent weight filter window to estimate the user’s subcarrier condition and data queue length,respectively.Compared with the conventional method,DSA achieves the better efficiency and fairness of delay due to employing the most of multi-user diversity.In addition,the fairness is guaranteed by DSA under heavy user loads by using different utility functions.Simulation results are consistent with the analysis results of the mathematic model.
Keywords:OFDM
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号