Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-06-29
2010-10-19
Ghayour, Mohammad H (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S316000, C375S371000, C370S516000
Reexamination Certificate
active
07817736
ABSTRACT:
A multi-carrier (MC) receiver receives a multi-carrier signal containing data symbols as well as pilot symbols. The MC receiver estimates a carrier frequency offset in a downconverted base-band multi-carrier signal in the frequency domain based on deviations of one or more characteristics of the pilot signals from predetermined values, and corrects for the offset in the time domain. In an embodiment, a second order phase locked loop (PLL) estimates the phase of the pilot signals to determine the carrier frequency offset. Changes in pilot phases caused due to the time domain correction are cancelled to allow the PLL to minimize deviations from the lock position.
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Gunturi Sarma S
Puvvada Nagasatya Srikanth
Tangudu Jawaharlal
Brady W. James
Ghayour Mohammad H
Malek Leila
Shaw Steven A.
Telecky , Jr. Frederick J.
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