Simple scheme for jitter reduction in closed-loop carrier frequency recovery based on overlapped observations

A very simple and efficient scheme for jitter reduction is proposed for a carrier frequency recovery loop using phase differential frequency estimation which estimates current frequency offset from the difference of the average phases of two successive intervals. Analytical and numerical results presented in this paper show that the steady-state jitter performance can be improved by simply overlapping the observation intervals for successive frequency error estimations by half, which does not require any additional hardware circuitry. Numerical results show that the proposed scheme also improves the convergence speed.