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US 7,406,117 B2Granted
XDSL multi-hybrid modem with power spectral density shaping
AssigneeWestell Technologies, Inc.
InventorsGreg Bella, Henry Gilsdorf, George Pitsoulakis
Life of this patent
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Abstract
Power spectral density shaping can be used in an XDSL system in order to adjust power spectral density properties of signals transmitted by an XDSL modem. The XDSL modem may include a power spectral density shaping filter, which can be adjusted to change the power spectral density properties of outputted signals. A processor may also perform power spectral density shaping of signals transmitted by the XDSL modem. The power spectral density shaping may be used to increase a downstream transmission rate.
Claims14
An ADSL transceiver comprising:
- an upstream transmission path filter comprising at least one adjustable power spectral density shaping filter for increasing a stopband between an upstream frequency range and a downstream frequency range for ADSL communications over an ADSL transmission line;
- a hybrid circuit communicatively coupled to an output from the upstream transmission path filter, wherein the hybrid circuit connects to the ADSL transmission line;
- and
- a processor communicatively coupled to the upstream transmission path, wherein the processor selectively adjusts the power spectral density shaping filter based on at least one condition causing an impedance mismatch between the hybrid circuit and the ADSL transmission line.
1 more element
Dependencies are inferred from the claim text.