Multiplex communications – Crosstalk suppression
Reexamination Certificate
2011-05-24
2011-05-24
Vu, Huy D (Department: 2461)
Multiplex communications
Crosstalk suppression
C370S286000, C370S268000, C370S282000, C375S229000, C375S260000, C375S285000, C375S296000
Reexamination Certificate
active
07948862
ABSTRACT:
A crosstalk cancellation system and method is disclosed for use in a multi-channel communication system. Crosstalk which couples between channels is cancelled through use of an in-line FFE filter and in-line delay. A cross-connect system associated with each channel includes a cross-connect delay and cross-connect filter. The cross-connect system generates a cancellation signal for each of the channels, which is routed into a junction. The junction subtracts the cancellation signal from the received signal, which has also been delayed and filtered, to remove unwanted cross-talk. During training, cancellation magnitude is monitored at various delay offsets to determine which offset and corresponding filter coefficients, for each delay, maximizes cancellation. The filters are set with filter coefficients that maximize cancellation. The cross-connect delay with the maximum offset is set to zero and its calculated offset amount is established as the in-line delay offset. The other cross-connect delay offsets are adjusted accordingly.
REFERENCES:
patent: 4359778 (1982-11-01), Lee
patent: 4583235 (1986-04-01), Dömer et al.
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 5222084 (1993-06-01), Takahashi
patent: 5305307 (1994-04-01), Chu
patent: 5307405 (1994-04-01), Sih
patent: 5388124 (1995-02-01), Laroia
patent: 5633863 (1997-05-01), Gysel et al.
patent: 5646958 (1997-07-01), Tsujimoto
patent: 5856970 (1999-01-01), Gee et al.
patent: 5896452 (1999-04-01), Yip et al.
patent: 5903546 (1999-05-01), Ikeda et al.
patent: 5909466 (1999-06-01), Labat et al.
patent: 6081502 (2000-06-01), Paneth et al.
patent: 6088827 (2000-07-01), Rao
patent: 6147979 (2000-11-01), Michel et al.
patent: 6160790 (2000-12-01), Bremer
patent: 6167082 (2000-12-01), Ling et al.
patent: 6201831 (2001-03-01), Agazzi et al.
patent: 6212225 (2001-04-01), Agazzi et al.
patent: 6226332 (2001-05-01), Agazzi et al.
patent: 6236645 (2001-05-01), Agazzi et al.
patent: 6249544 (2001-06-01), Agazzi et al.
patent: 6252904 (2001-06-01), Agazzi et al.
patent: 6253345 (2001-06-01), Agazzi et al.
patent: 6259729 (2001-07-01), Seki
patent: 6272173 (2001-08-01), Hatamian
patent: 6285653 (2001-09-01), Koeman et al.
patent: 6297647 (2001-10-01), Kirk et al.
patent: 6304598 (2001-10-01), Agazzi et al.
patent: 6351531 (2002-02-01), Tahernezhaadi et al.
patent: 6356555 (2002-03-01), Rakib et al.
patent: 6433558 (2002-08-01), Sciacero et al.
patent: 6463041 (2002-10-01), Agazzi
patent: 6480532 (2002-11-01), Vareljian
patent: 6493448 (2002-12-01), Mann et al.
patent: 6553085 (2003-04-01), Trans
patent: 6584160 (2003-06-01), Amrany et al.
patent: 6618480 (2003-09-01), Polley et al.
patent: 6665402 (2003-12-01), Yue et al.
patent: 6751255 (2004-06-01), Reuven et al.
patent: 6792038 (2004-09-01), Agazzi
patent: 6813311 (2004-11-01), Pal et al.
patent: 6819709 (2004-11-01), Agazzi et al.
patent: 6862326 (2005-03-01), Eran et al.
patent: 6928168 (2005-08-01), Kirkeby
patent: 6961373 (2005-11-01), Jones
patent: 7110449 (2006-09-01), Heo et al.
patent: 2001/0036160 (2001-11-01), Curran et al.
patent: 2002/0067824 (2002-06-01), Wang
patent: 2002/0106016 (2002-08-01), Egelmeers et al.
patent: 2002/0176492 (2002-11-01), Zangi et al.
patent: 2002/0191552 (2002-12-01), Watkinson
patent: 2003/0067888 (2003-04-01), Bina et al.
patent: 2003/0223505 (2003-12-01), Verbin et al.
patent: 2004/0001427 (2004-01-01), Belotserkovsky et al.
patent: 2004/0001540 (2004-01-01), Jones
patent: 2004/0022311 (2004-02-01), Zerbe et al.
patent: 2004/0125487 (2004-07-01), Sternad et al.
patent: 2005/0157811 (2005-07-01), Bjerke et al.
patent: 2007/0143811 (2007-06-01), Powell
patent: 2007/0237270 (2007-10-01), Mezer et al.
patent: 2008/0013742 (2008-01-01), Chang
patent: 0250048 (1987-12-01), None
patent: 2003-250193 (2003-09-01), None
patent: 2009-116472 (2009-05-01), None
patent: 10-2007-0018663 (2007-02-01), None
Gi-Hong Im, et al., “Performance of a Hybrid Decision Feedback Equalizer Structure for CAP-Based DSL Systems”,IEEE Transactions on Signal Processingvol. 49, No. 8, Aug. 2001, pp. 1768-1785.
Eyuboglu M V., “Flexible Precoding for V.Fast”, Data Transmission—Advances in Modem and ISDN Technology and Applications, 1992., UK, IEE, UK 1992, pp. 13-18.
R.F.H. Fischer and J.B. Huber, “Comparison of precoding schemes for digital subscriber lines,”IEEE Transactions on Communications, vol. 45, pp. 334-343, Mar. 1997.
M. Hatamian et al., “Design considerations for Gigabit Ethernet 1000BASE-T twisted pair transceivers,” inProceeding IEEE Custom Integrated Circuits Conference, Santa Clara, CA, May 1998, pp. 335-342.
E.F. Haratsch and K. Azadet, “A 1-Gb/s joint equalizer and trellis decoder for 1000BASE-T Gigabit Ethernet,”IEEE Journal of Solid-State Circuits, vol. 36, pp. 374-384, Mar. 2001.
Jaime E. Kardontchik, 4D Encoding in Level-One's Proposal for 1000Base-T, Aug. 21, 1997, pp. 1-24.
Gottfried Ungerboeck, Trellis-Coded Modulation with Redundant Signal Sets Part 1: Introduction, IEEE Communications Magazine, Feb. 1987, pp. 5-21.
Oscar Agazzi, Nambi Seshadri, Gottfried Ungerboeck, 10Gb/s PMD Using PAM-5 Trellis Coded Modulation, Mar. 6-10, 2000, pp. 1-38.
M. Tomlinson, “New Automatic Equalizer Employing Modulo Arithmetic,”Electronic Letters, vol. 7, pp. 138-139, 1971.
H. Harashima and H. Miyakawa, “Matched-transmission technique for channels with intersymbol interference,”IEEE Transactions on Communications, vol. COM-20, No. 4, pp. 774-780, Aug. 1972.
P. Kabal and S. Pasupathy, “Partial-response signaling,”IEEE Transactions on Communications, vol. COM-23, No. 9, pp. 921-934, Sep. 1975.
R.F.H. Fischer, W.H. Gerstacker, and J.B. Huber, “Dynamics limited precoding, shaping, and blind equalization for fast digital transmission ever twisted pair lines,”IEEE Journal on Selected Areas in Communications, vol. 13, No. 9, pp. 1622-1633, Dec. 1995.
“Gigabit Ethernet Over Category 5”, Copyright 2000-2001 Agilent Technologies, 12 pages.
M.P. Sellers, et al., “Stabilized Precoder for Indoor Radio Communications”,IEEE Communications Letters, vol. 4, No. 10, Oct. 2000, pp. 315-317.
“Wirescope 350—Understanding ELFEXT”, © 2000 Agilent Technologies, 2 pages.
David Crawford, “Adaptive Filters”, © David Crawford 1996, pp. 1-5.
David A. Johns, et al., “Integrated Circuits for Data Transmission Over Twisted-pair Channels”, IEEE Journal of Solid-State Circuits, vol. 32, No. 3, Mar. 1997, pp. 398-406.
Prof. David Johns, University of Toronto, “Equalization”, © D.A. Johns 1997, 29 pages.
David Smalley, “Equalization Concepts: A Tutorial”, Atlanta Regional Technology Center, Texas Instruments, pp. 1-29, Oct. 1994.
Richard D. Wesel, et al., “Achievable Rates for Tomlinson-Harashima Precoding”,IEEE Transactions on Information Theory, vol. 44, No. 2, Mar. 1998, pp. 824-831.
Wolfgang H. Gerstacker, et al., “Blind Equalization Techniques for xDSL Using Channel Coding and Precoding”, submitted to AEÜ Int. J. Electr. Commun., pp. 1-4, May 1999.
Chip Fleming, “A Tutorial on Convolutional Coding with Viterbi Decoding”, © 1999-2002, Spectrum Applications, pp. 1-6.
ELFEXT—Introduction, Fluke Networks™, © 2000, pp. 1-2.
“Iowegian's dspGuru FIR FAQ Part 2: Properties”, © 1999-2000 Iowegian International Corp., pp. 1-4.
“28.5 Protocol Implementation Conformance Statement (PICS) Proforma for Clause 28, Physical Layer Link Signaling for 10 Mb/s 100 Mb/s and 1000 Mb/s Auto-Negotiation on Twisted Pair”,IEEE Std. 802.3, 1998 Edition, pp. 6-14 and 18-44.
Huiting Chen, et al. “Current Mirror Circuit with Accurate Mirror Gain for Low β Transistors”, supported in part by Dallas Semiconductor Corp., 4 pages, (Date Unknown).
A. Hekersdorf, et al., “A Scalable SDH/SONET Framer Architecture for DATACOM and TELCO Applications”,
Hailu Kibrom T
Solarflare Communications, Inc.
Vu Huy D
Weide & Miller Ltd.
LandOfFree
Crosstalk cancellation using sliding filters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crosstalk cancellation using sliding filters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crosstalk cancellation using sliding filters will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2628046