Timing recovery switching for an adaptive digital broadband beamforming (antenna diversity) for ATSC terrestrial DTV based on a differentiator
AssigneeKoninklijke Philips Electronics N.V.
InventorJoseph Patrick Meehan
Life of this patent
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Abstract
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.
Claims20
For use in a dual antenna receiver, a synchronization system for differentiator-base switching between timing recovery errors comprising:
- first and second timing recovery loops, each coupled to a different antenna input;
- at least one differentiator receiving timing errors from each of said first and second timing recovery loops, said at least one differentiator determining rates of change for said timing errors;
- and
- a control mechanism employing said rates of change to select a timing error produced by one of said first and second timing recovery loops to be utilized in synchronizing both said first and second timing recovery loops with received signals.
A receiver comprising:
- first and second antenna inputs;
- and
- a synchronization system for differentiator-based switching between timing recovery errors, said synchronization system comprising:
- first and second timing recovery loops, each coupled to a different antenna input;
- at least one differentiator receiving timing errors from each of said first and second timing recovery loops, said at least one differentiator determining rates of change for said timing errors;
- and
- a control mechanism employing said rates of change to select a timing error produced by one of said first and second timing recovery loops to be utilized in synchronizing both said first and second timing recovery loops with received signals.
For use in a dual antenna receiver, a method differentiator-based switching between timing recovery errors comprising:
- coupling first and second timing recovery loops to different antenna inputs;
- determining rates of change for timing errors from each of said first and second timing recovery loops;
- and
- employing said rates of change to select a timing error produced by one of said first and second timing recovery loops to be utilized in synchronizing both said first and second timing recovery loops with received signals.
Dependencies are inferred from the claim text.