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

2007-11-13

2007-11-13

Deppe, Betsy L. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S259000

Reexamination Certificate

active

11190770

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.

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Recommendation G.992.1 (ex-G.dmt) of the International Telecommunication Union (ITU), Annex A & B, pp. 138-166 (1999).
Osnat Neulender “A High-Performance ADSL over POTS Mask which is Compatible with FDD ADSL over ISDN.” (2000) Orckit Communications Ltd., ETSI STC TM6, Montreux, Switzerland 8 pages.

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