Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reexamination Certificate
2005-12-20
2005-12-20
Chin, Stephen (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
C375S223000, C375S271000, C375S273000, C375S329000, C455S023000
Reexamination Certificate
active
06977965
ABSTRACT:
A receiver includes an I-Q demodulator (135) responsive to the I and Q components carried on a first frequency signal line (132). A demodulator frequency generator (275) generates a demodulating signal to extract the carried I and Q components. A phase adjustment circuit (105) makes the demodulating signal substantially in phase with the first frequency signal. A transition detector (445) generates a state transition signal in response to a change of state of at least one of the I and Q signals. A peak detector (460) generates a peak detected signal in response to occurrence of a peak amplitude of at least one of the I and Q signals. A clock generator (470) adjusts the phase of a symbol clock signal used to decode the I and Q components in response to the state transition signal and peak detected signal.
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Ivashin Victor S.
Nguyen Luu V.
Chin Stephen
File Erin M.
McAndrews Held & Malloy Ltd.
Tellabs Operations Inc.
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