Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-07-03
1998-05-05
Tse, Young T.
Pulse or digital communications
Receivers
Automatic frequency control
375329, 329304, H04L 2706
Patent
active
057486824
ABSTRACT:
Briefly, in accordance with one embodiment of the invention, an oscillator frequency offset error estimator at the receiving end of a wireline communications system comprises: a phase comparator adapted to compare two successive signal samples, each signal sample being derived from a baseband signal transmitted via the wireline communications system. The phase comparator is further adapted to have at least one of the two signal samples provided along a signal path through a phase shifter and a time delay. In accordance with another embodiment, a method of comparing signal samples to estimate the oscillator frequency offset error for an oscillator at the receiving end of a wireline communications system comprises the steps of: delaying a signal sample processed by the oscillator at the receiving end of the wireline communications system at least until the next successive signal sample processed by the oscillator is also obtained; adjusting the phase of at least one of the two signal samples; and, after the phase adjusting step, comparing the phase of the two signal samples. The signal samples are derived from a baseband signal transmitted via the wireline communications system.
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Lucent Technologies - Inc.
Tse Young T.
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