一种DMB-TH系统的频偏粗估计算法

A coarse frequency offset estimation algorithm for the DMB-TH system

针对我国新一代的数字电视地面广播传输系统DTMB中频偏估计计算量大、估计速度慢的难题,提出一种改进的频偏粗估计算法.先进行帧头位置粗估计,然后采用引入了频率偏差的本地零相位PN序列与接收序列进行滑动相关的扫频方法进行频偏粗估计.理论分析和仿真结果表明,在高斯和多径信道下此算法都能较快速地进行频偏粗估计.

For the problems of large amount of computation and low speed of frequency offset estima- tion that exists in the new generation digital terrestrial television broadcasting transmission system DT- MB, this paper presents an improved coarse frequency offset estimation algorithm, in which header po- sition coarse estimation is done first, and then use frequency scan method which uses sliding correla- tion between the local zero - phase PN sequence with frequency offset and received sequence. Theoret- ical analysis and simulation results show that this algorithm can estimate the coarse frequency offset faster than other algorithms in the Ganssian and multi -path channel.