一种CMMB系统频偏估计改进算法的研究

摘要

Due to transmission environment of large and smal scale fading, Doppler fading in CMMB system, a frequency difference, loop filter and doppler spread estimation algorithm are used to compensate on the receiving end signal. The simulation shows that under Doppler environment, compared to frequency compensation algorithm, the algorithm avoids the phase deviation, while reducing the frequency deviation lock time, and system fluctuations time.%针对CMMB系统中接收信号因受传输环境的大、小尺度衰落、多普勒衰落影响，通过频率偏差鉴差算法、环路滤波算法、多普勒扩展估计算法对接收端信号进行频率偏差补偿。实验仿真表明，在多普勒环境下，该算法可以避免经典算法中频率补偿带来的相位偏差，同时缩短频率偏差锁定时间，减少系统波动时间。