CDMA系统中载频频偏估计的新方法

A Novel Scheme of Estimating Carrier Frequency Offset in CDMA

本文针对存在载频频偏的CDMA系统,提出了一种新的估计该固有频偏的方法。先从理论上分析了CDMA信号经过广义平稳非相干散射信道(WSSUS)时载频频偏估计的最大似然算法;根据CDMA系统设有连续导频的特点,对该算法进行改进,大大降低了计算的复杂度,并易于工程实现。仿真结果表明,该算法能够精确地估计出载频频偏。

A novel scheme of estimating the carrier frequency offset in CDMA system with the continuous pilot channel is proposed. The algorithm is derived from the maximum-likelihood(ML) rule in the wide-sense stationary un-correlative scattering channel(WSSUS). Considering the characteristic of CDMA with continuous pilot channel, a useful scheme is obtained by simplifying the algorithm .The simulation results show that the scheme can estimate the carrier frequency offset accurately and is very simple to apply in practice.