Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2007-10-30
2007-10-30
Tran, Khanh (Department: 2611)
Pulse or digital communications
Transceivers
Modems
C370S201000, C370S484000
Reexamination Certificate
active
10618678
ABSTRACT:
A method and apparatus for efficient filter structure for an enhanced operation of an ADSL-DMT modem on a subscriber loop with an environment consisting of ISDN interference. The method performs equalization of the channel by impulse response shortening and at the same time rejecting interference signals exhibiting cyclostationary properties. The method and apparatus for reducing the crosstalk involves a frequency-shifted versions of the received signal being filtered through frequency-shifted adaptive filters in the appropriate branches, and providing a joint time domain equalizer/crosstalk canceller to perform equalization of the channel and crosstalk cancellation in one instance and a separate crosstalk canceller to cancel crosstalk plus a time domain equalizer to equalize the channel. Downsampling the signal outputs of both the combined crosstalk equalizer and the frequency-shifted adaptive filters to reduce sampling rate; and subtracting the outputs of the combined crosstalk equalizer and the frequency-shifted adaptive filters to remove the cyclostationary interferer.
REFERENCES:
patent: 5566167 (1996-10-01), Duttweiler
patent: 5859914 (1999-01-01), Ono et al.
patent: 5991311 (1999-11-01), Long et al.
patent: 6266347 (2001-07-01), Amrany et al.
patent: 6393051 (2002-05-01), Koizumi et al.
patent: 6944289 (2005-09-01), Tahernezhaadi et al.
patent: 6999504 (2006-02-01), Amrany et al.
patent: 6999517 (2006-02-01), Bombay et al.
Koen Vanbleu, Geert Ysebaert, Marc Moonen, Piet Vandaele; “Combined Equalization and Alien Crosstalk Cancellation in ADSL Receivers”; Proc. 3rdIEEE Benelux Signal Processing Symposium (SPS-2002), Belgium, Mar. 21-22, 2002; vanbleu,ysebaert,moonen@esat.kuleuven.ac.be; piet.vandaele@alcatel.be.
Brooktree Broadband Holding, Inc.
Thomas Kayden Horstemeyer & Risley LLP
Tran Khanh
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