Decision-directed digital phase locked loop

Details Decision-directed digital phase locked loop Decision-directed digital phase locked loop

1992-10-20

1995-03-21

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375120, H03L 318

Patent

active

054003644

ABSTRACT:
A decision-directed phase-locked loop for not synchronizing with opposite phases where the proper data of a PRS channel reproduced signal do not exist. The loop comprises a digital loop filter, a ternary level predicting portion, a phase modification signal generating portion and an instantaneous phase detecting portion. The phase value of a future data existing point is first obtained on the basis of the phase value of the current data existing point in a reproduced signal output from the digital loop filter. The ternary level predicting portion predicts future data of the reproduced signal based on the phase value of the future data existing point and on future sampled values of the reproduced signal. Given the predicted future data, the phase modification signal generating portion checks to see if the current zero cross point of the reproduced signal is a data existing point. If the current zero cross point is found to be a data existing point, the digital loop filter modifies its output phase value using the instantaneous phase value supplied by the instantaneous phase detecting portion.

REFERENCES:
patent: 5166955 (1992-11-01), Ohta
patent: 5272730 (1993-12-01), Clark

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