Timing recovery switching for an adaptive digital broadband beamforming (antenna diversity) for ATSC terrestrial DTV based on a differentiator

摘要

A synchronization system within a dual antenna receiver employs two timing recovery loops each coupled to a different antenna input. The timing error computed within each timing recovery loop is differentiated by a high pass filter and compared to a predefined threshold indicating convergence. Both sampling rates are then synchronized utilizing the timing error from whichever loop converges first. If synchronization lock for the selected loop is lost, the other loop is selected to provide timing error to both loops.