Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2002-11-27
2009-10-06
Payne, David C (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S150000, C375S324000, C375S325000, C375S329000, C375S330000, C375S331000, C375S332000, C375S342000, C375S343000
Reexamination Certificate
active
07599452
ABSTRACT:
A method and system of improving sensitivity in the demodulation of a received signal over an arbitrary measurement time epoch, the method comprising the steps of: correlating the received signal in a coherent fashion (80); and utilizing a Viterbi phase state keying trellis demodulation with a variable resolution of phase states over 360° to demodulate the radio frequency phase trajectory of the signal throughout the measurement time epoch (70); and the system comprising a receiver for receiving a direct sequence spread spectrum signal, the receiver comprising: an antenna (10) for receiving the direct sequence spread spectrum signal; a downconverter (40) for downconverting the received signal, producing a downconverted signal; an analog to digital converter (60) to convert the downconverted signal to a digital signal; a despreader (80) for despreading and coherently correlating the digital signal to a known signal, creating a despread signal; and a processor (70) for applying a Viterbi algorithm to the despread signal.
REFERENCES:
patent: 5237587 (1993-08-01), Schoolcraft
patent: 5353278 (1994-10-01), Murakami et al.
patent: 5375129 (1994-12-01), Cooper
patent: 5448600 (1995-09-01), Lucas
patent: 5654667 (1997-08-01), Adachi
patent: 5832041 (1998-11-01), Hulyalkar
patent: 5872801 (1999-02-01), Mobin
patent: 6356595 (2002-03-01), Czaja et al.
patent: 6370201 (2002-04-01), Abbaszadeh et al.
patent: 6404801 (2002-06-01), Lennen
patent: 6477208 (2002-11-01), Huff
patent: 6633615 (2003-10-01), Pekarich et al.
patent: 6721366 (2004-04-01), Van Stralen
patent: 6940927 (2005-09-01), Van Stralen
patent: 7120207 (2006-10-01), Nordman
patent: 7154965 (2006-12-01), Zeng et al.
Bruno et al., “Design and Evaluation of a Soft Output Viterbi Algorithm (SOVA) for use in a Concatenated Coding Scheme”, (Oct. 16, 2001).
Mutsumu Serizawa et al.: Phase-Tracking Viterbi Demodulator Electronics & Communications, Scripta Technica/ New York, US vol. 79, No. 1, 1996, pp. 82-96.
Moffat & Co.
Payne David C
Research In Motion Limited
Vlahos Sophia
LandOfFree
Method and system for applying Viterbi type PSK demodulation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for applying Viterbi type PSK demodulation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for applying Viterbi type PSK demodulation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4065674