Home phone line networking next generation enhancements
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United States of America Patent
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-
Feb 5, 2008
Grant Date -
N/A
app pub date -
Apr 22, 2003
filing date -
Feb 15, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
New version devices of a home phone line network may operate on a first carrier frequency (within the new version frequency band) while old version devices may operate at a second carrier frequency (within the old version frequency band). Preamble, header, and trailer portions of a new version signal include a plurality of spectral copies of a baseband modulated signal. One or more of these spectral copies of the baseband modulated signal is/are indistinguishable from corresponding components of an old version signal. The new version signal is transmit filtered to have a negatively sloping power spectral density in order to maintain a constant power level in relation to old version signals and to have slope that is opposite of binder crosstalk so as to form, with the average crosstalk, a constant level white noise floor.
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