EE 445S Real-Time Digital Signal Processing Laboratory - Lecture 18

Announcements

• The first two multicarrier communication standards were finalized in 1995:
  • ETSI ETS 300 401, Radio Broadcasting Systems for Digital Audio Broadcasting (DAB), Feb. 1995. Note: DAB service was available in Europe in 1996.
  • ANSI T1.413-1995 Discrete Multitone (DMT) Standard for Asymmetric Digital Subscriber Line (ADSL) Modems, Aug. 1995. Note: ADSL lines were available in Austin in 1997, and interoperable commercial modems were available in 1999.

• For customer premise equipment for ADSL, i.e. modems for the home:
  • In 2004, TI had largest market share (37%) worldwide
  • In 2007, Broadcom has the largest market share.

• ADSL modems reached 62M units in 2007 and 70M units in 2008. Modem choices include ADSL1, ADSL2, ADSL2+. ADSL2+ modems can provide up to 24 Mbps downstream in a point-to-point connection.

• DOCSIS 3.0 standard approved for cable modems. Minimum of 160 Mbps downstream and 120 Mbps upstream, shared by the users on the local area network. [December 2007].

• In 2009, DSL had $100B in revenue of the $164B fixed broadband service market that also includes cable modems and fiber broadband. (News story)

Lecture

• Lecture slides on ADSL Transceivers in PowerPoint format.

Supplemental Material

• Video "CMA Video.wmp" in the Companion CD that comes with Johnson & Sethares' Telecommunication Breakdown book explains how an equalizer works.
• Discrete Multitone Modulation Time Domain Equalizer Design Toolbox for Matlab, by Güner Arslan, Biao Lu, and Brian L. Evans.

• LabVIEW ADSL2 Simulator. Version 1.1 (May 24, 2006) implements a discretized, physical layer simulator for an ADSL2 system. The structure and default parameters of the transmitter, channel model, and receiver follow the ADSL2 ITU-T G.992.3 standard. A standalone executable demonstration that does not need a LabVIEW license is also available.

• Güner Arslan, "Introduction", ch. 1 of Equalization for Discrete Multitone Transceivers, Dept. of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712-1084, Dec. 2000.
• Güner Arslan, "Previous Methods for Time Domain Equalizer Design", ch. 2 of Equalization for Discrete Multitone Transceivers, Dept. of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712-1084, Dec. 2000.
• Walter Y. Chen, DSL: Simulation Techniques and Standards Development for Digital Subscriber Line Systems, Macmillan Technical Publishing, 1998, ISBN 1-57870-017-5.
• Thomas Starr, John M. Cioffi, and Peter J. Silverman, Understanding Digital Subscriber Line Technology, (CD-ROM included), Prentice Hall PTR, 1999, ISBN 0-13-780545-4.

Last updated 11/15/14. Send comments to bevans@ece.utexas.edu