Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-01-29
2008-01-29
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S144000, C375S229000, C375S316000, C375S350000, C455S067110, C455S063100, C455S522000
Reexamination Certificate
active
10790168
ABSTRACT:
A narrowband interference cancellation system, method and digital signal processor is disclosed that removes narrowband interference in wide band communication systems. The system includes a narrowband processing component, wideband processing component, soft metric generator and at least one filter. The system is configured to receive a signal, identify one or more narrowband interferers in the received signal and filter out identified narrowband interferers. The narrowband processing component includes a filter bank configured to separate the received signal into a predetermined number of channel bands and identify a band with interference. The wide band processing component provides an average level for an unfiltered version of the received signal. The soft decision metric generator produces metrics based on predetermined thresholds. The filters receive coefficients that are determined using outputs from the soft decision metric generator that are first averaged using long term integrators and then stored in lookup tables.
REFERENCES:
patent: 6115614 (2000-09-01), Furukawa
patent: 6192067 (2001-02-01), Toda et al.
patent: 6426983 (2002-07-01), Rakib et al.
patent: 7092352 (2006-08-01), Shattil
patent: 2001/0050987 (2001-12-01), Yeap et al.
patent: 2002/0006174 (2002-01-01), Nafie et al.
patent: 2002/0087199 (2002-07-01), Bange et al.
patent: 2003/0119450 (2003-06-01), Vannatta et al.
patent: 2003/0179840 (2003-09-01), Oh et al.
patent: 2004/0008765 (2004-01-01), Chung et al.
patent: WO 01/78242 (2001-10-01), None
patent: WO 03/90422 (2003-10-01), None
Haub David R.
Rahman Mahibur
Sobchak Charles L.
Vannatta Louis J.
Fan Chieh M.
Fortkort John A.
Fortkort & Houston P.C.
Lee Siu M
Motorola Inc.
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