Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-05-10
2011-05-10
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S341000, C714S795000
Reexamination Certificate
active
07940872
ABSTRACT:
A joint demodulation filter for reducing co-channel interference between a desired signal and a co-channel interfering signal may include an input receiving samples of the desired signal and the co-channel interfering signal, a Viterbi decoder, and a first signal path between the input and the Viterbi decoder comprising a first filter. The joint demodulation filter may further include a second signal path between the input and the Viterbi decoder and comprising a linear finite impulse response (FIR) modeler for generating a channel impulse response estimate for the co-channel interfering signal. Additionally, a third signal path may be between the input and the Viterbi decoder and include a whitened matched filter for generating a channel impulse response estimate for the desired signal.
REFERENCES:
patent: 5349607 (1994-09-01), Moreno
patent: 5493307 (1996-02-01), Tsujimoto
patent: 5528625 (1996-06-01), Ayanoglu et al.
patent: 6154443 (2000-11-01), Huang et al.
patent: 6330294 (2001-12-01), Ansbro et al.
patent: 6714607 (2004-03-01), Kobylinski et al.
patent: 6724809 (2004-04-01), Reznik
patent: 6775260 (2004-08-01), Dabak et al.
patent: 7155660 (2006-12-01), Burd
patent: 7257174 (2007-08-01), Dornstetter et al.
patent: 7295636 (2007-11-01), Onggosanusi et al.
patent: 7487432 (2009-02-01), Ashley et al.
patent: 2004/0017863 (2004-01-01), Learned
patent: 2004/0081074 (2004-04-01), Piechocki
patent: 2004/0141565 (2004-07-01), Kwak et al.
patent: 2004/0234004 (2004-11-01), Ketchum et al.
patent: 2008/0159452 (2008-07-01), Kelley
patent: 0952711 (1999-10-01), None
patent: 2007/022627 (2007-03-01), None
Samanta,Joint Co-channel Interference Cancellation and Channel Shortening with Space-Time Processing, Wireless Systems Innovations Laboratory, University of Texas at Austin, Spring 2003.
Pipon et al.,Multichannel Receivers Performance Comparison in the Presence of ISI and CCI, Thomson-CSF Communications, IEEE Digital Signal Processing Proceedings, 1997. DSP 97, 1997 13th International Conference on Publication Date: Jul. 2-4, 1997, vol. 1, pp. 371-374.
Liang et al.,A Two-Stage Hybrid Approach for CCI/ISI Reduction with Space-Time Processing, IEEE Communications Letters, vol. 1, No. 6, Nov. 1997.
Spagnolini,Adaptive Rank-One Receiver for GSM/DCS Systems, IEEE Transactions on Vehicular Technology, vol. 51, No. 5, Sep. 2002.
Ding et al.,Single-Channel Blind Equalization for GSM Cellular Systems, IEEE Journal on Selected Areas in Communications, vol. 16, No. 8, Oct. 1998.
Seshadri,Joint Data and Channel Estimation Using Blind Trellis Search Techniques, IEEE Transactions on Communications, vol. 42, No. 2/3/4, Feb./Mar./Apr. 1994.
Daneshgaran et al.,Blind Estimation of Output Labels of SIMO Channels Based on a Novel Clustering Algorithm, IEEE Communication Letters, vol. 2, No. 11, Nov. 1998, pp. 307-309.
Pedersen et al.,SAIC Helps Combat Interference, CommsDesign, Aug. 15, 2005, available at www.commdesign.com.
Forney, “Maximum-likelihood sequence estimation of digital sequences in the presence of intersymbol interference”, IEEE Transactions on Information Theory, vol. IT-18, No. 3, May 1972, pp. 363-378.
Ungerboeck, “Adaptive maximum likelihood receiver for carrier-modulated data-transmission systems”, IEEE Transactions on Communications, vol. COM-22, No. 5, May 1974, pp. 624-636.
Kemenczy Zoltan
Simmons Sean
Wu Huan
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Bocure Tesfaldet
Research In Motion Limited
LandOfFree
Joint demodulation filter for co-channel interference... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Joint demodulation filter for co-channel interference..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Joint demodulation filter for co-channel interference... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2693554