Doppler shift estimation and pre-compensation of satellite communication;

Several Doppler shift estimators, including mean logarithm envelope difference(MLED) method, auto-correlation function (ACF) method, zero crossing rate (ZCR) method and mean square phase difference (MSPD) method are discussed and compared.

DFT-Code acquisition method can estimate Doppler shifts while searching PN phase.

Doppler frequency offset is always the passive factor that can t be neglected in satellite communication.

The doppler-shift of the time-varying multi-path channel was estimated by calculating the level crossing rate (LCR) of the signal envelope of the channel coefficient estimates on the effective fingers.

The Doppler-shift of the time-varying multi-path channel can be estimated by calculating the level crossing rate (LCR) of the signal envelope of the channel coefficient estimates on the effective fingers.

The characteristics of phase difference in the time-varying channel are analyzed, then the Doppler-shift of the time-varying multi-path channel is estimated by calculating the expectation of the square phase difference of the channel coefficients on the effective fingers.

This paper presents a new method for rapid Doppler frequency shift estimation andframe synchronization in HF burst-communication.