Telephonic communications – Transmission line conditioning – Interference suppression
Reexamination Certificate
2005-01-04
2005-01-04
Isen, F. W. (Department: 2644)
Telephonic communications
Transmission line conditioning
Interference suppression
C379S416000, C379S093010, C379S282000, C379S286000, C370S201000, C375S296000
Reexamination Certificate
active
06839429
ABSTRACT:
System and methods for determining an optimized transmit spectra (spectral distributions of transmission power) for a set of communications channels that experience cross-talk among themselves and for transmitting data on the channels. The transmit spectra are preferably constructed so that largely contiguous frequency bands are allocated to each signaling direction (upstream/downstream) on each communications channel and/or to each channel in the set of channels. In one embodiment, each communications channel is restricted to a maximum time-averaged power. The method preferably includes steps of determining the channel transfer functions of the communications channel, determining interference characteristics of the channels, calculating substantially optimal transmit spectra for the communications channels, and redistributing the frequency bins so that they are contiguously grouped in each transmit spectra. The contiguous groupings allow wider frequency bands for signaling in the channel. In one embodiment, the channel is limited by a “peak-power constraint.”
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Baraniuk Richard G.
Gaikwad Rohit V.
Conley & Rose, P.C.
Isen F. W.
Singh Ramnandan
WM. Marsh Rice University
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