Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-07-07
2009-12-08
Perilla, Jason M. (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S327000, C375S340000, C375S344000
Reexamination Certificate
active
07630459
ABSTRACT:
A frequency acquisition circuit for compensating a frequency offset of a received signal. A multiplier compensates the received signal according to a phase compensation signal to generate a first compensation signal, wherein the first compensation signal comprises a preamble and a plurality of symbols, and each of the symbols has a symbol length. A correlator generates a conjugate value according to symbols adjacent to the first compensation signal. A phase evaluator generates a phase angle through a COSTAS circuit according to a real part and an imaginary part of the conjugate value and generates a phase angle signal according to the phase angle and the symbol length. A phase accumulator for accumulating the phase angle signals of different symbols to generate an accumulated phase angle signal. An oscillator generates the phase compensation signal by looking up a table according to the accumulated phase angle signal.
REFERENCES:
patent: 5506836 (1996-04-01), Ikeda et al.
patent: 5579338 (1996-11-01), Kojima
patent: 6639939 (2003-10-01), Naden et al.
patent: 6983134 (2006-01-01), Asahara et al.
patent: 7200188 (2007-04-01), Fague et al.
patent: 2004/0146122 (2004-07-01), Fague et al.
patent: 1758639 (2006-04-01), None
patent: 10-303997 (1998-11-01), None
patent: 10-2004-0107607 (2004-12-01), None
Marvin K. Simon, IEEE Transactions on Communications, vol. com- 26, No. 4, Apr. 1978, pp. 420-432.
Stephen Riter, IEEE Transactions on Aerospace and Electronics Systems, vol. Aes-5, No. 4, Jul. 1969, pp. 627-631.
Holly C. Osborne, IEEE Transactions on Communications, vol. Com-30, No. 10, Oct. 1982, pp. 2289-2296.
Birch & Stewart Kolasch & Birch, LLP
Industrial Technology Research Institute
Perilla Jason M.
LandOfFree
Frequency acquisition and tracking circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency acquisition and tracking circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency acquisition and tracking circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4063497