Pulse or digital communications – Transceivers – Modems
Patent
1996-11-13
2000-03-28
Chin, Stephen
Pulse or digital communications
Transceivers
Modems
H04B 138
Patent
active
060441070
ABSTRACT:
An MDSL modem is provided that is inter-operable with an ADSL modem. The present invention provides a method for modem operation, by dividing available bandwidth for the modem into a plurality of subsets, selecting at least one of the plurality of subsets for use as a communication path, reducing the SNR value used for bit loading for the selected subsets by a predetermined amount, undersampling any received data, and fast fourier transforming the received data to recover the data transmitted. An MDSL modem is provided having circuitry for dividing available bandwidth for the modem into a plurality of subsets, circuitry for selecting at least one of the plurality of subsets for use as a communication path, circuitry for reducing the SNR value used for bit loading for the selected subsets by a predetermined amount, circuitry for undersampling any received data, and circuitry for fast fourier transforming the received data to recover the data transmitted.
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Gatherer Alan
Nafie Mohammed
Shaver Donald P.
Chin Stephen
Donaldson Richard L.
Franz Warren L.
Ghayour Mohammad
McClure C. Alan
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