Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-12-12
2011-11-08
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S238000, C375S239000, C375S242000, C375S256000, C375S353000, C455S130000, C329S311000, C329S304000
Reexamination Certificate
active
08054920
ABSTRACT:
A repeated preamble bit or symbol pattern such as for a binary phase shift keyed (BPSK) communications signal is received within a modem. An initial frequency offset and phase error estimate is generated by processing a Fast Fourier Transform (FFT) that detects the repeated preamble pattern for a block of samples within the communications signal. Two halves of the block of samples are correlated with a plurality of different BPSK shifted sequences to obtain a symbol timing alignment based on the shifted sequence providing the maximum correlation value. A frequency offset estimate is iteratively updated an N number of times using the shifted sequence providing the maximum correlation value to refine an acquisition estimate of the frequency offset and phase error of the received 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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