Communication start-up with variant spectral density mask

Details Communication start-up with variant spectral density mask Communication start-up with variant spectral density mask

2005-09-06

2005-09-06

Deppe, Betsy L. (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

06940913

ABSTRACT:
A method is provided for initiating communications over a channel between a transmitter and a receiver within a specified spectral range, subject to a mask to be applied at the transmitter so as to attenuate at least one segment of the spectral range. The method includes providing to the receiver a definition of the at least one segment and of a level of attenuation to be applied within the at least one segment during a training interval of the communications. A training signal is transmitted from the transmitter to the receiver while applying to the training signal the level of attenuation within the at least one segment. The receiver compensates for a response of the channel based on the received training signal and on the definition of the at least one segment and of the level of attenuation.

REFERENCES:
patent: 5559723 (1996-09-01), Mourot et al.
patent: 5636244 (1997-06-01), Goodson et al.
patent: 5949819 (1999-09-01), Bjarnason et al.
patent: 6219378 (2001-04-01), Wu
patent: 6332009 (2001-12-01), Olafsson
Recommendation G.992.1 (ex-G.dmt) of the International Telecommunication Union (ITU), Annex A & B, pp. 138-166, Jul. 1999.
Osnat Neulender, “A High-Performance ADSL Over POTS Mask Which is Compatible With FDD ADSL Over ISDN”, 8 pages, Feb. 28-Mar. 3, 2000, Orckit Communications LTD., ETSI STC TM6, Montreux, Switzerland.

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