Design of PSK carrier recovery loop under large frequency offset

摘要

Based on the idea of phase frequency detector (PFD), a novel carrier recovery loop for PSK signals with large frequency offset is proposed. By prolonging the “Hold” stage, the frequency acquisition ability of PFD-PLL is enhanced. A new simple lock detection method is also proposed, for lock detection in the proposed carrier recovery loop. Analysis and simulation results show the superiority of the proposed method under medium-to-high SNRs.