Cycle slip detection for timing recovery

Abstract

A method and an arrangement for cycle slip detection for timing recovery of a received analog signal including asynchronously sampled digital data are implemented with a timing recovery control loop using a technique known as interpolated timing recovery and improved cycle slip detection as well as improved cycle slip correction based on said cycle slip detection. The method includes using an output signal of the loop filter in the control loop for timing recovery, generating averaged timing error values from said filtered timing error signal and accumulating changes of the averaged timing error values in adjacent blocks of samples which exceed a first threshold. Accumulated averaged timing error changes of adjacent blocks which exceed a second threshold are then declared as cycle slip and the number of cycle slips is determined by a third threshold being a tolerance threshold.