Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2006-07-18
2010-06-29
Torres, Juan A (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C455S307000, C708S300000
Reexamination Certificate
active
07746970
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: 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: 2005/0047802 (2005-03-01), Jaynes et al.
patent: 2006/0023799 (2006-02-01), Kang et al.
patent: 2006/0251198 (2006-11-01), Ma et al.
patent: 2007/0098090 (2007-05-01), Ma et al.
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.
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.
Qualcomm Incorporated
Seo Howard
Torres Juan A
LandOfFree
Method and apparatus for filtering noisy estimates to reduce... 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 filtering noisy estimates to reduce..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for filtering noisy estimates to reduce... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4178885