Compensating for spectral attenuation

Details Compensating for spectral attenuation Compensating for spectral attenuation

2008-05-06

2008-05-06

Phu, Phuong (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S219000, C375S220000, C375S231000, C375S232000, C375S350000

Reexamination Certificate

active

07369603

ABSTRACT:
A method and apparatus to compensate for spectral attenuation are described wherein the spectral attenuation for a communications channel is determined, a first filter is created for the attenuation and the first filter compensates for the attenuation. The spectral attenuation for the communications channel is determined by a received L sequence signal that is used to model the spectral attenuation as a second filter. Other embodiments are described and claimed.

REFERENCES:
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patent: 5483243 (1996-01-01), Gramlich et al.
patent: 5646621 (1997-07-01), Cabler et al.
patent: 6118879 (2000-09-01), Hanna
patent: 6219378 (2001-04-01), Wu
patent: 6608862 (2003-08-01), Zangi et al.
patent: 2002/0106035 (2002-08-01), Harikumar et al.
patent: 2003/0023430 (2003-01-01), Wang et al.
patent: 2004/0209585 (2004-10-01), Wang et al.

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