摘要
提出了一种估计MC CDMA系统FFT起始时间偏差的新方法,采用连续训练序列来获得最初时间同步.分析了频率偏差对时间偏差估计器的影响.把这种新方法与常用的Schmidl和Cox方法(简称SC方法)做了仿真比较,比较参数为估计器均值和方差,考虑了AWGN信道和随时间慢变化的频率选择性信道.结果显示新方法的估计均值偏差和方差均小于SC方法.
A new method to estimate the FFT block timing offset in the MC-CDMA system is proposed. Consecutive training sequences are used to acquire the initial time synchronization. The effect of the frequency offset on this estimator is analyzed. We compared this new method with the Schmidl and Cox's method (the SC method for short) through simulation in terms of estimator mean and variance, both in the AWGN channel and in the time-varying frequency selective channel. Results show that the mean bias and variance of the new method are all less than those of the SC's method.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2003年第1期11-15,25,共6页
Journal of Xidian University
基金
国家自然科学基金资助项目(69872028)
国家"863"计划资助项目(2001AA123031)
关键词
MC-CDMA
CDMA
时偏估计
积分范围
频偏估计
均值偏差
方差
码分多址
Code division multiple access
Communication channels (information theory)
Estimation
Multicarrier modulation
Simulation
Time varying networks
