摘要
为了提高时变信道中OFDM载波频偏的估计性能,在相邻符号之间插入短时重复训练序列进行载波频偏估计,进而通过缩短相关间隔来降低信道时变对载波频偏估计的影响.仿真结果表明,当时变信道归一化多普勒频率大于0.1时,短时序列估计方法的性能优于传统循环前缀方法;而当信道变化加快时,短时序列估计方法的性能优势更加明显,更适宜高速移动环境中的载波频偏估计.
In order to improve the estimation performance of cartier frequency offset （CFO） for OFDM sys- tems in time-varying channel, the short repetitive training sequences were inserted between any two OFDM symbols and then were used to estimate the CFO. The impact of time-varying channel on the estimation of CFO was thus reduced by decreasing the correlation interval. Simulation results showed that when the nor- malized Doppler frequency of time-varying channel was above 0.1, the short training sequence based meth- od was superior in performance to the conventional cyclic prefix based one, especially so when the channel varies faster, and thus was more applicable in high mobility environments.
出处
《郑州轻工业学院学报（自然科学版）》
CAS
2012年第5期99-102,共4页
Journal of Zhengzhou University of Light Industry:Natural Science
基金
中央高校基本科研业务费专项资金资助(11QZR02)
福建省自然科学基金项目(2012J05119)
广西无线宽带通信与信号处理重点实验室2011年度主任基金项目(21104)
华侨大学科研基金资助项目(12BS222)
关键词
正交频分复用
载波频偏估计
时变信道
orthogonal frequency division multiplexing（OFDM）
carrier frequency offset estimation
time va- rying channel
作者简介
作者简介：陈东华（1977-），男，安徽省濉溪县人，华侨大学讲师，博士，主要研究方向为宽带移动通信．
