Pulse or digital communications – Transceivers
Reexamination Certificate
2006-03-07
2006-03-07
Chin, Stephen (Department: 2634)
Pulse or digital communications
Transceivers
C379S345000, C379S394000, C379S398000, C370S379000, C333S117000, C343S822000, C340S315000, C326S030000
Reexamination Certificate
active
07010025
ABSTRACT:
An improved analog front end and methods for increasing the power efficiency of duplex signals on a transmission line are disclosed. The improved analog front end bifurcates a hybrid into a fixed portion and an adaptive portion. The adaptive portion combines a biquad and a summer to produce a filter transfer function suited to compensate for transmission line irregularities. A method for configuring a local transceiver to minimize power requirements at a remote transmitter is disclosed. Broadly the method entails, applying a transmit signal to a front end in the absence of a remote signal; optimizing the transmit signal power; recording the reflected transmit signal; applying an adaptive filter in response to transmission line irregularities; and controllably adjusting the adaptive filter to minimize the amplitude of the reflected version of the transmit signal in the receive path. A method for recovering a remotely generated signal is also disclosed. The method entails, applying a local transmit signal to the front end in the absence of a remote signal; recording a reflected version of the transmit signal in the receive path; controllably adjusting an adaptive portion of the front end to minimize the amplitude of the reflected version of the local transmit signal; and combining a scaled replica of the local transmit signal with a plurality of adaptive filter outputs to recover a remotely generated receive signal from the transmission line.
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An Integrated Adapative Analog Balancing Hybrid For Use In (A) DSL Modems, Frédéric Pécourt, Jörg Hauptmann, Aner Tenen, 1999 IEEE International Solid-State Circuits Conference, ISSCC99/Session 14Paper TP 14.8, Feb. 16, 1999, pp. 252-253, 466.
Helfenstein Markus
Lim Drahoslav
Moschytz George S.
Muralt Arnold
Chin Stephen
GlobespanVirata Inc.
Thomas Kayden Horstemeyer & Risley
Vartanian Harry
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