Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-04-11
2006-04-11
Ghebretinsae, Temesghen (Department: 2637)
Pulse or digital communications
Receivers
Angle modulation
C375S316000, C375S321000, C348S725000
Reexamination Certificate
active
07027528
ABSTRACT:
Improved carrier recovery and symbol timing systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system is disclosed. Carrier and symbol timing acquisition and tracking loops are phase/frequency locked to an inserted pilot signal provided in an input VSB spectrum at a given frequency. An input spectrum is centered about baseband and the pilot is extracted by an equivalent filter which functions as a bandpass filter having pass bands centered about the pilot frequency. Since the pilot signal's frequency is given, its position in the frequency domain for any sampling frequency, is deterministic. The receiver's sampling frequency is provided such that the relationship is expressed as fc=fS/4. When tracked by a phase-lock loop, the pilot signal will appear at the correct location in the spectrum if the sampling frequency fSis correct, and will be shifted in one direction or the other if the sampling frequency fSis too high or too low.
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Jaffe Steven T.
Liu Tian-Min
Tan Loke Kun
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