基于OFDMA的WiMAX周期测距中的多用户频偏估计  

Multiuser carrier frequency offset estimation for WiMAX periodic ranging based on OFDMA

作　　者：范达[1] 曹志刚[1] 易芝玲 

机构地区：[1]清华大学电子工程系,北京100084 [2]香港应用科技研究院

出　　处：《通信学报》2010年第4期80-87,共8页Journal on Communications

摘　　要：针对WiMAX OFDMA上行链路的周期测距,提出了2种适用于多用户的载波频偏估计方法,分别采用PN码的时域及频域相关特性提取期望测距用户,并给出了多用户情况下CFO估计的理论结果。仿真实验证明,基于频域相关的方法更适合于在一个测距时隙内存在多个测距用户的情况,并且不易受定时偏差估计误差的影响。Under WiMAX OFDMA framework, two carrier-frequency offset （CFO） estimation methods for multiuser case were proposed for periodic ranging process. The theoretical results of the two methods were derived in the case of multiuser, in which the time-domain and frequency-domain correlation properties of PN code are used for extracting the desired ranging user respectively. Simulation results show that the proposed frequency-domain correlation method per- forms better than the time-domain correlation method even in the case of multiple users simultaneously existing in one ranging time-slot. And it more robust to timing offsets result from the symbol timing offset （STO） estimation error.

关 键 词：正交频分多址 周期测距 载波频率偏移 时域相关 频域相关 

分 类 号：TN911.7[电子电信—通信与信息系统]