高鲁棒性的CMMB小数频偏估计算法

摘要

由于采用了OFDM调制方式,CMMB手机电视系统对载波频率同步非常敏感.在分析直流分量对频偏估计影响原理的基础上,基于差分变换提出了一种小数频偏估计的改进算法,该算法与传统算法相比,在仅略微增加运算量的基础上有效地抑制了直流分量对估计精度的影响.%Due to the adoption of the OFDM modulation mode, the estimation of carrier frequency offset is a crucial issue in a CMMB receiver. In this paper, on the basis of analyzing the direct current (DC) offset effect, a novel frequency offset estimation algorithm is proposed. The validity of the proposed estimators is confirmed by simulations.