一种基于PN序列的上行多用户OFDM系统载波频偏估计算法  

A PN-Based Carrier Frequency Offset Estimation Algorithm for Multiuser OFDM Uplink

作　　者：任术波[1] 郭俊奇[1] 吴建军[1] 项海格[1] 

机构地区：[1]北京大学电子学系卫星与无线通信实验室,北京100871

出　　处：《北京大学学报（自然科学版）》2009年第6期983-988,共6页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：针对多用户正交频分复用(OFDM)系统上行链路中的载波频偏估计问题,提出一种基于伪噪声(PN)序列的载波频偏(CFO)估计算法。该算法将不同相位的PN序列作为各个用户的训练序列,利用训练序列良好的自相关性估计出存在CFO情形下不同用户的信道参数,再根据两个训练周期内信道参数的相位变化获得各用户的CFO估值。理论分析和仿真结果表明本算法具有优良的估计性能。The authors propose a pseudo-noise （PN） sequence-based carrier frequency offset （CFO） estimation algorithm for multiuser OFDM uplink. In the proposed algorithm, a PN sequence and its circular-shifting versions are considered as training sequences for different users, and then channel parameters with CFO factors from each user to a central base station can be estimated by virtue of autocorrelation characteristic of the PN sequence. Finally all users＇ CFO estimates can be acquired simultaneously by calculating channel phase-angle difference between two training periods. The simulation result shows that the proposed algorithm achieves better estimation performance.

关 键 词：多用户OFDM系统 伪噪声(PN)序列 载波频偏(CFO)估计 

分 类 号：TN919.3[电子电信—通信与信息系统]