Channel impulse response (CIR)-based and secondary synchronization channel (SSC)-based (frequency tracking loop (FTL)/time tracking loop (TTL)/channel estimation

摘要

Methods and systems are disclosed for channel estimation and frequency tracking in mobile communication systems. Particularly, various ways of using the time domain impulse channel response based on the staggered frequency domain pilot tones are presented that enable rapid frequency error estimation and frequency tracking control. A mathematical model is developed that provides a convenient metric for evaluating tolerable frequency error, as well as modes for switching between channel impulse response (CIR)-based and secondary synchronization channel (SSC)-based frequency tracking.