Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-07-08
2008-07-08
Wang, Ted (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S136000, C375S147000, C375S229000, C375S316000
Reexamination Certificate
active
11267070
ABSTRACT:
In a method for achieving higher S/N, one or more signals are received and processed to provide one or more streams of samples. In a first processing scheme, the sample stream(s) are equalized within an equalizer to generate symbol estimates, which may be subsequently processed (e.g., despread and decovered) to provide a first stream of recovered symbols. Each sample stream is filtered with a set of coefficients and may be scaled with a scaling factor. The scaled samples for all streams are then combined to generate the symbol estimates. The sample stream(s) may also be processed by a second processing scheme with one or more rake receivers to provide a second stream of recovered symbols. The signal quality for each processing scheme can be estimated and used to select either the first or second processing scheme.
REFERENCES:
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5283531 (1994-02-01), Serizawa et al.
patent: 5490165 (1996-02-01), Blakeney, II et al.
patent: 5764687 (1998-06-01), Easton
patent: 5799005 (1998-08-01), Soliman
patent: 5812601 (1998-09-01), Schramm
patent: 5903554 (1999-05-01), Saints
patent: 5930296 (1999-07-01), Kot
patent: 6078573 (2000-06-01), Batalama et al.
patent: 6175588 (2001-01-01), Visotsky et al.
patent: 6314147 (2001-11-01), Liang et al.
patent: 6522683 (2003-02-01), Smee et al.
patent: 6545990 (2003-04-01), Amalfitano et al.
patent: 6570918 (2003-05-01), Rademacher
patent: 6574211 (2003-06-01), Padovani et al.
patent: 0961416 (1999-01-01), None
patent: 2346765 (2000-08-01), None
S. Haykin and A. Steinhardt, Adaptive Radar Detection and Estimation, Jun. 1992, pp. 205-207, John Wiley & Sons, Inc., New York.
S. Haykin, Adaptive Filter Theory, Third Edition, Dec. 1995, pp. 365-444, Prentice Hall, New Jersey.
International Search Report, International Searching Authority EPO, International Application No. PCT/US2001/022756, Feb. 28, 2002.
Javier Ramos et al., “Low-Complexity Space-Time Processor for DS-CDMA Communications,” IEEE Transactions on Signal Processing, vol. 48, No. 1, Jan. 2000, pp. 39-52.
Abdelgader M. Legnain et al. “New Adaptive Combined Space-Time Receiver for Multiuser Interference Rejection in Synchronous CDMA Systems,” Electrical and Computer Engineering, 1998, pp. 421-424.
Jalali Ahmad
Smee John E.
Chen Alex C.
Gordon Alan C.
QUALCOMM Incorporated
Rouse Thomas R.
Wang Ted
LandOfFree
Method and apparatus for processing a modulated signal using... 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 apparatus for processing a modulated signal using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for processing a modulated signal using... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3936963