Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-12-12
2011-11-15
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S238000, C375S239000, C375S242000, C375S256000, C375S353000, C455S130000, C329S311000, C329S304000
Reexamination Certificate
active
08059767
ABSTRACT:
A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and processor that generates an initial frequency offset estimate and phase error estimate by processing such as with a Fast Fourier Transform (FFT), that detects the repeated preamble pattern for a block of samples within the communications signal, correlates two halves of the block of samples with a plurality of different shifted sequences and determines a maximum correlation value for the shifted sequence that provides the maximum correlation value to establish a symbol timing estimate based on the known timing alignment of this shifted sequence. Radio circuitry is operative with the modem for processing communications data obtained from the communications signal.
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Furman William N.
Nieto John W.
Tyler William L.
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Harris Corporation
Liu Shuwang
McKie Gina
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