Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2008-03-18
2008-03-18
Ghayour, Mohammed (Department: 2611)
Multiplex communications
Duplex
Transmit/receive interaction control
C370S289000, C379S406010, C379S406050, C455S570000, C375S343000
Reexamination Certificate
active
10621293
ABSTRACT:
A system and method for estimating a channel spectrum. The method includes: (a) receiving an input signal from a channel, where the input signal includes one or more major echoes and zero or more minor echoes introduced by the channel; (b) identifying the one or more major echoes present in the input signal; (c) identifying the minor echoes from a filtered autocorrelation function of the input signal in response to a determination that there is only one major echo; (d) identifying the minor echoes from a filtered power spectrum of the input signal in response to a determination that there is more than one major echo; (e) computing a channel spectrum estimate from the major echoes and minor echoes; where the channel spectrum estimate is usable to remove at least a portion of the one or more major echoes and one or more minor echoes from the input signal.
REFERENCES:
patent: 4823382 (1989-04-01), Martinez
patent: 5117418 (1992-05-01), Chaffee et al.
patent: 5172232 (1992-12-01), Koo
patent: 5648987 (1997-07-01), Yang et al.
patent: 5809069 (1998-09-01), Polley et al.
patent: 2002/0051087 (2002-05-01), Limberg et al.
patent: 2002/0191779 (2002-12-01), Pham
patent: 2004/0030859 (2004-02-01), Doerr et al.
patent: 0 975 124 (2000-01-01), None
patent: WO 00/64114 (2000-10-01), None
Patent Application No. PCT/US03/22598, International Search Report, Mailed Feb. 27, 2004.
G. A. Clark, S. K. Mitra, S. R. Parker, “Block Implementation of Adaptive Digital Filters,” IEEE Trans. ASSP, pp. 744-752, vol. 29, Jun. 1981.
G. A. Clark, S. K. Mitra, S. R. Parker, “Block Implementation of Adaptive Digital Filters,” IEEE Trans. CAS, pp. 584-592, vol. 6, Jun. 1981.
J. C. Lee and C. K. Un, “Performance Analysis of Frequency-Domain Block LMS Adaptive Digital Filters,” IEEE Trans. on Circuits and Systems, pp. 173-189, vol. 36, No. 2, Feb. 1989.
Monisha Ghosh, “Blind Decision Feedback Equalization for Terrestrial Television Receivers,” Proceedings of the IEEE, pp. 2070-2081, vol. 86, No. 10, Oct. 1998.
Advanced Television Systems Committee, “ATSC Standard: Digital Television Standard, Revision B with Amendments 1 and 2,” Document A/53B, Aug. 7, 2001; Amendment 1, May 23, 2002; Amendment 2, May 19, 2003.
Garmany Jan D.
Hallidy William H.
Brightwell Mark K.
Coherent Logix, Incorporated
Ghayour Mohammed
Hood Jeffrey C.
Malek Leila
LandOfFree
Frequency domain equalization of communication signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency domain equalization of communication signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency domain equalization of communication signals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3924041