摘要
提出了一种适用于上行正交频分复用码分多址接入(OFDM CDMA)系统的简单定时和频率同步方法.在该方法中,首先通过利用各自在频域和码域上正交训练序列的相关性来完成多用户符号定时估计;然后利用最大似然原则得到频偏估计.仿真结果表明了该算法具有优良的最小均方误差性能.
A simple timing and frequency synchronization method for the uplink orthogonal frequency division multiplexing-code division multiple access (OFDM-CDMA) was proposed, where the multiuser symbol timing was achieved by making use of good correlation property of training sequences that are distinguished not only in frequency domain but in code domain. Also the frequency offset was estimated based on maximum likelihood (ML) principle. Simulation result shows that the mean square error (MSE) performance of the proposed estimation algorithm is satisfied.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2005年第3期72-74,78,共4页
Journal of Beijing University of Posts and Telecommunications
基金
国家"863计划"项目(2003AA123310
2004AA123160)
关键词
正交频分复用
码分多址接入
上行同步
Code division multiple access
Correlation theory
Maximum likelihood estimation
Synchronization
