基于比率选择的自适应子载波分配方法  

A new ratio-based selection adaptive subcarrier allocation algorithm

作　　者：张力力[1] 张胜利[1] 周武旸[1] 

机构地区：[1]中国科学技术大学个人通信与扩频实验室,安徽合肥230027

出　　处：《中国科学技术大学学报》2006年第8期797-800,共4页JUSTC

基　　金：国家自然科学基金(60496314);国家"863"计划(2003AA12331003)资助

摘　　要：根据已有的无线资源分配算法,提出了一种新的基于比率选择(ratio-based selection,RBS)的分配算法.在多用户OFDM系统中,目前常用的次优子载波算法由于只遵循信道增益最好规则而可能导致不得不分配信道增益很差的子载波给用户的现象.RBS算法采用信道增益最好用户和次好用户的“比率”来分配子载波,避免了这种情况的发生.仿真显示,与其他次优子载波分配算法相比,RBS算法能够以较低的运算量获得更好的性能,具有较高的实用性.A new sub-optimal subcarrier allocation algorithm named ratio-based selection （RBS） was proposed based on some previous algorithms. In multi-user OFDM system, some frequently used suboptimal allocation algorithms probably allocated subcarriers with deep fading to users according to the ＂best channel gain＂ rule. However the RBS algorithm avoids this situation by allocating subcarriers according to the ＂ratio＂ which is equal to the best user＇s channel gain over the channel gain of the user next to the best one. Simulation result shows that RBS algorithm can obtain better performance with relatively lower computational complexity.

关 键 词：正交频分复用 子载波 自适应 

分 类 号：TN929.531[电子电信—通信与信息系统]