Pulse or digital communications – Equalizers
Reexamination Certificate
2007-04-10
2007-04-10
Kumar, Pankaj (Department: 2611)
Pulse or digital communications
Equalizers
Reexamination Certificate
active
10204249
ABSTRACT:
The invention relates to implementing a training phase of adaptive channel equalization on a digital communications path using QAM- or CAP-modulation method and comprising at least one band-stop filter that forms a stop band on a the signal spectrum. Training of adaptive equalizers is performed utilizing a sparse symbol constellation, wherein a number of symbol states (S) is smaller than that of a symbol constellation used in a normal data transmission state. The benefit of the sparse symbol constellation is that a strong intersymbol interference caused by the stop band can thus be reduced to such a low level in regard to a signal power that a linear equalizer may be used to reach a situation, wherein a proportion of correct symbol decisions becomes sufficiently high for training of a decision-feedback equalizer.
REFERENCES:
patent: 4227152 (1980-10-01), Godard et al.
patent: 6360369 (2002-03-01), Mahoney
patent: 6493381 (2002-12-01), Werner et al.
patent: 6842495 (2005-01-01), Jaffe et al.
patent: 1 014 635 (2000-06-01), None
Garth et al., IEEE Transactions on Communications, vol. 49, No. 3, pp. 455-466 (2001).
Yang et al., 13thInternational Conference on Digital Signal Processing Proceedings, vol. 1, DSP 97, pp. 127-130 (1997).
Kumar Pankaj
Tellabs Oy
LandOfFree
Method and system for training adaptive channel equalization 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 system for training adaptive channel equalization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for training adaptive channel equalization will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3765957