LAUSR

In space communications, there exist two prominent issues: large Doppler spread and limited pilot resources, which will result in poor performance for a pilot-aided (PA) traditional carrier synchronization mode (TCSM) with serial processing. In view of this, we propose a frequency-phase decoupling method (FPDM) based on an unbiased auto-correlation (AC) operator with a variable correlation delay length. By using this method, a new carrier synchronization mode (NCSM) is developed with parallel processing. Taking the classical maximum likelihood (ML) estimation as an example, both theoretical analysis and simulation results show that considering a modified generalized frame format: 1) the resulting NCSM can implement decoupling of the frequency offset estimator (FOE) and the phase offset estimator (POE) and 2) the POE of the NCSM achieves stronger ability of anti-Doppler spread and requires less complex multiplication operations compared to that of the TCSM.