Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-07-26
2011-07-26
Torres, Juan A (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C455S307000, C708S300000
Reexamination Certificate
active
07986756
ABSTRACT:
Techniques for filtering noisy estimates to reduce estimation errors are described. A sequence of input values (e.g., for an initial channel impulse response estimate (CIRE)) is filtered with an infinite impulse response (IIR) filter having at least one coefficient to obtain a sequence of output values (e.g., for a filtered CIRE). The coefficient(s) are updated based on the sequence of input values with an adaptive filter, a bank of prediction filters, or a normalized variation technique. To update the coefficient(s) with the adaptive filter, a sequence of predicted values is derived based on the sequence of input values. Prediction errors between the sequence of predicted values and the sequence of input values are determined and filtered to obtain filtered prediction errors. The coefficient(s) of the IIR filter are then updated based on the prediction errors and the filtered prediction errors.
REFERENCES:
patent: 4243935 (1981-01-01), McCool et al.
patent: 5461426 (1995-10-01), Limberg et al.
patent: 5513221 (1996-04-01), Parr et al.
patent: 5557646 (1996-09-01), Honma
patent: 5825832 (1998-10-01), Benedetto
patent: 6209014 (2001-03-01), Prasad
patent: 6907092 (2005-06-01), Yakhnich et al.
patent: 7065371 (2006-06-01), Kleinerman
patent: 7433402 (2008-10-01), Al-Dhahir et al.
patent: 7505537 (2009-03-01), Sutardja
patent: 2003/0072277 (2003-04-01), Subrahmanya et al.
patent: 2003/0231725 (2003-12-01), Scarpa
patent: 2005/0047802 (2005-03-01), Jaynes et al.
patent: 2005/0157801 (2005-07-01), Gore et al.
patent: 2005/0207508 (2005-09-01), Singh et al.
patent: 2006/0023799 (2006-02-01), Kang et al.
patent: 2006/0072485 (2006-04-01), Cairns et al.
patent: 2006/0251198 (2006-11-01), Ma et al.
patent: 2007/0098090 (2007-05-01), Ma et al.
patent: 2008/0260014 (2008-10-01), Yang et al.
patent: 2009/0129458 (2009-05-01), Pietraski et al.
patent: 1555638 (2004-12-01), None
Rao, “Adaptive notch filtering for the retrieval of sinusoids in noise”, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 32, Issue 4, Aug. 1984 pp. 791-802.
Ozcelik, “Recursive quadratically constrained least squares bias-free IIR system identification via variable loading”, The 2002 45th Midwest Symposium on Circuits and Systems, 2002, MWSCAS-2002, vol. 3, Aug. 4-7, 2002 pp. III-660-III-663 vol. 3.
Johnson, “Adaptive IIR filtering: Current results and open issues” IEEE Transactions on Information Theory, Issue Date: Mar. 1984, vol. 30 Issue:2, On pp. 237-250.
International Search Report and Written Opinion—PCT/US2006/060952, International Search Authority—European Patent Office—Mar. 15, 2007 (051150).
Shen, Q. et al: “The Linear Prediction Method of Fading Channel Estimation for the Rake Receiver with Impulsive Interference” Wireless Personal Communications, Springer, Dordrecht, NL, vol. 6, No. 3, Mar. 1, 1998, pp. 233-248.
Alilaghatta-Kantharaj Vijayaraj
Kasturi Nitin
Mergen Gokhan
Subrahmanya Parvathanathan
Moskowitz Larry J.
Patel Ashish L.
Qualcomm Incorporated
Torres Juan A
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