Pulse or digital communications – Equalizers
Reexamination Certificate
2006-10-31
2006-10-31
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Equalizers
C375S232000, C375S285000, C375S350000, C455S307000
Reexamination Certificate
active
07130342
ABSTRACT:
A wireless receiver and method employs a forward/backward recursive covariance based filter coefficient generation scheme for equalizing a received wireless signal, such as a CDMA signal or other suitable signal. A forward/backward recursive covariance based filter coefficient generating circuit (206) includes a forward recursion portion (300) that receives data representing channel estimates (18) of a communication channel, and data representing an auto-covariance matrix (22). The forward recursion portion (300) produces a set of output values (306) from each iteration stage (400a–400n) of the forward recursion portion (300). The set of output values (306) are stored and a backward recursion portion (302) obtains the set of output values (306) and also receives the data representing the auto-covariance matrix (22), and generates filter coefficients (208) based on this information.
REFERENCES:
patent: 6658071 (2003-12-01), Cheng
patent: 6952460 (2005-10-01), Van Wechel et al.
patent: 6954495 (2005-10-01), Piirainen
Yakun Sun, Reduced-rank Adaptive Equalization, Northwestern University, Evanston, Illinois, Jan. 30, 2001.
David C. Ricks and J. Scott Goldstein, Efficient Architectures for Implementing Adaptive Algorithms, Proceedings of the 2000 Antenna Applications Symposium, Allerton Park, Monticello, Illinois, Sep. 20-22, 2000.
Bachu Raja
Buckley Michael Eoin
Stewart Kenneth
Ha Dac V.
Motorola Inc.
Vedder Price Kaufman & Kammholz P.C.
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