摘要:提出一种基于中国数字电视标准DTMB(Digital Terrestrial/Television Multimedia Broadcasting)的时域定时恢复方案.该方案采用全数字延迟锁定环来跟踪定时误差,与传统的时域鉴相器相比,本文提出的鉴相算法能实现增益的自动归一化,且捕获范围为原算法的三倍,能纠正采样频率偏差达到±90ppm.此外本方案能实现环路带宽的自动调整,以兼顾较快的收敛速度和较小的抖动.本文最后给出了此方案的性能仿真及VLSI实现结果.
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