考虑同步与均衡的数字电视地面传输系统设计
Design of digital television terrestrial multimedia broadcasting system considering the synchronization and equalization

提出一种基于数字电视地面广播传输标准（DTMB）的同步和均衡系统的设计方案. 系统经过初同步后，针对频偏估计复杂度高、计算量大，提出一种精简的基于累加算法的频偏细估计方案，并根据累加模值的大小判定来应对突发频偏. 然后通过对同步后帧体数据和当前信道估计值的并行处理，捕获及处理定时同步和信道估计间的影响. 仿真表明：在多径信道下，该系统具有良好的同步和均衡性能，并能对突发情况作出相应处理.
：In this paper，a synchronization and equalization system design scheme based on the digital television terrestrial multimedia broadcasting(DTMB) standards is presented.For the frequency offset estimation with high complexity and large amount of calculation，this paper presents a fine frequency offset estimation scheme based on accumulation after the initial synchronization.According to determine the size of cumulative value to deal with sudden frequency offset.Based on the parallel processing of the synchronous frame body data and current channel estimation value，we capture and manage the influence between timing synchronization and channel estimation. Simulations show that under multipath channel，the system has good performance of synchronization and equalization，and makes the corresponding processing to the emergency