Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2005-08-23
2005-08-23
Nguyen, Simon (Department: 2685)
Multiplex communications
Duplex
Transmit/receive interaction control
C455S063100, C455S114200, C455S295000, C370S286000, C370S289000, C375S254000, C375S346000
Reexamination Certificate
active
06934265
ABSTRACT:
Interference reduction with a current-mode transversal filter having taps including binary current sources is provided. Each binary current source provides an output current having either of two distinct values, depending on a binary input. The product of a tap coefficient and an interference data signal value is obtained by independently generating the contribution from each interference data bit using a binary current source and providing these contributions to a current summing junction. Binary current sources can be implemented in analog, digital, or mixed-mode circuitry. Echo, near end cross talk, and far end cross talk are examples of interference that can be reduced in this manner. The use of binary current sources provides significant flexibility, especially in connection with multilevel modulation schemes such as pulse amplitude modulation (PAM).
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Callicotte Mark
Hara Susuma
KeyEye
Lumen Intellectual Property Services Inc.
Nguyen Simon
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