Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-06-13
2006-06-13
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Angle modulation
C370S210000
Reexamination Certificate
active
07061997
ABSTRACT:
A method and an apparatus relating to a fine frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a multi-carrier demodulation system of the type capable of carrying out a differential phase decoding of multi-carrier modulated signals, the signals comprising a plurality of symbols, each symbol being defined by phase differences between simultaneous carriers having different frequencies. A phase difference between phases of the same carrier in different symbols is determined. Thereafter, a frequency offset is determined by eliminating phase shift uncertainties related to the transmitted information from the phase difference making use of a M-PSK decision device. Finally, a feedback correction of the carrier frequency deviation is performed based on the determined frequency offset. Alternatively, an averaged frequency offset can be determined by averaging determined frequency offsets of a plurality of carriers. Then, the feedback correction of the frequency deviation is performed based on the averaged frequency offset.
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Badri Sabah
Buchholz Stephan
Eberlein Ernst
Gerhaeuser Heinz
Heuberger Albert
Chin Stephen
Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung
Roylance,Abrams,Berdo & Goodman, L.L.P.
Ware Cicely
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