Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2006-07-25
2006-07-25
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S136000, C375S144000, C375S147000, C370S206000, C370S335000, C370S342000
Reexamination Certificate
active
07082174
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 and combined 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. The sample stream(s) may be equalized prior to being combined. In this case, 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. Alternatively, the sample stream(s) may be combined prior to being equalized. In this case, each sample stream is scaled by a scaling factor. The scaled samples for all streams are then combined to generate summed samples that are further filtered with a set of coefficients 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: 0961416 (1999-01-01), None
patent: 2346765 (2000-08-01), None
U.S. Appl. No. 08/963,386, entitled “Method and Apparatus for High Rate Packet Data Transmission,” filed Nov. 3, 1997, now pending. Paul E. Bender, Qualcomm Inc., San Diego, CA (USA).
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.
Godsey Sandra L.
Liu Shuwang
QUALCOMM Incorporated
Rouse Thomas R.
Wadsworth Philip
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