Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-11-15
2005-11-15
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S343000, C370S320000, C370S335000, C370S479000, C704S218000, C704S237000
Reexamination Certificate
active
06965631
ABSTRACT:
One embodiment of the present invention includes a circular shift register, K storage elements, and a code register. The circular shift register having N data samples circularly shifts a first data sample of the N data samples into a data position at a first clock frequency. The N data samples correspond to signal received from one of K satellites in a global positioning system (GPS). The N data samples are loaded into the circular shift register at a second clock frequency. The K storage elements store K code sequences, respectively. Each of the K code sequences has N code samples and includes a first code sample being written at a code position corresponding to the data position at a third clock frequency. The K storage elements correspond to the K satellites. The code register stores the N code samples loaded from one of the K storage elements at a fourth clock frequency. The fourth clock frequency is K times faster than the first clock frequency.
REFERENCES:
patent: 4651154 (1987-03-01), Wong et al.
patent: 4701934 (1987-10-01), Jasper
patent: 4785463 (1988-11-01), Janc
patent: 5222245 (1993-06-01), Ando
patent: 5365447 (1994-11-01), Dennis
patent: 5402347 (1995-03-01), McBurney
patent: 5420593 (1995-05-01), Niles
patent: 5535237 (1996-07-01), LaPadula
patent: 5592173 (1997-01-01), Lau
patent: 5594453 (1997-01-01), Rodal
patent: 5629708 (1997-05-01), Rodal
patent: 5650785 (1997-07-01), Rodal
patent: 5663734 (1997-09-01), Krasner
patent: 5703597 (1997-12-01), Yu
patent: 5781156 (1998-07-01), Krasner
patent: 5798732 (1998-08-01), Eshenbach
patent: 5831574 (1998-11-01), Krasner
patent: 5841396 (1998-11-01), Krasner
patent: 5854605 (1998-12-01), Gildea
patent: 5874914 (1999-02-01), Krasner
patent: 5884214 (1999-03-01), Krasner
patent: 5897605 (1999-04-01), Kohli
patent: 5901171 (1999-05-01), Kohli
patent: 5943363 (1999-08-01), Hanson
patent: 6169771 (2001-01-01), Shou et al.
patent: 6304216 (2001-10-01), Gronemeyer
patent: 6671311 (2003-12-01), Raphaeli et al.
Michael S. Braasch, A.J. Van Dierendonck, “GPS Receiver Architectures and Measurements”, Proceedings of the IEEE, vol. 87, No. 1, Jan. 1999, pp 18-64.
Chadha, K., “The Global Positioning System: Challenges in Bring GPS to Mainstream Consumers”, IEEE International Solid-State Circuits Conference, 1998, Digest of Technical Papers, p.: 26″28.
P.G. Mattos, “WAAS/EGNOS Ready 2-Chip GPS Chipset”, IEEE Conference on Satellite Systems for Mobile Communications and Navigation, May 13-15th, 1996, pp 24-27.
D.J.R. Van Nee et al. “New Fast GPS Code-Acquisition Technique Using FFT”, Electronics Letters, Jan. 17, 1991, vol. 27, No. 2, pp 158-160.
Asai, T.; Sakamoto, T.; Hase, T., “Software Solution of GPS Baseband Processing”, International Conference on Consumer Electronics, 1998. ICCE. 1998 Digest of Technical Papers, p.: 180″181.
K. Boehm, et al., “An IF Digitizing Receiver for a Combined GPS/GSM Terminal”, Proceedings of IEEE Rawcon 1998, pp 39-42.
Won Namgoong, Sydney Reader, Teresa Meng, “An All-Digital IF GPS Synchronizer for Portable Applications”, ISSCC 99, Paper WA 19.5, pp 340-341.
Teresa Meng, “Low Power GPS Receiver Design”, IEEE Workshop on Signal Processing Systems, 1998. SIPS 98 pp.: 1-10.
Reader, S., Namgoong, W., Meng, T., “Partitioning Analog and Digital Processing in a Single Chip GPS Receiver”, IEEE Workshop on Signal Processing Systems, 1998. SIPS 98, pp.: 253-259.
Weihua Zhuang; Sundara Murthy, K.M., “Modeling and Performance Analysis of Digital Baseband Processor of the GPS Receiver”, Third IEEE International Symposium on Personal, Indoor and Mobile Radio communications, 1992 Proceedings, PIMRC ′92, pp.: 372-376.
Won Namgoong, “Fast and Power-Efficient Synchronization of Direct-Sequence Spread Spectrum Signals”, PhD Dissertation, Stanford University, Jul. 1999.
Guo Guirong, et al. “Mixer Free All Digital Quadrature Demodulation”, Proceedings of ICSP98, pp. 1704-1707.
Mehrnia Alireza
Shakeri Kaveh
Soheili-Najafabadi Farshid
Blakely , Sokoloff, Taylor & Zafman LLP
Ha Dac V.
PRI Research & Development Corp.
LandOfFree
Low power passive correlators for multichannel global... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low power passive correlators for multichannel global..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low power passive correlators for multichannel global... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3453953