Joint signaling techniques for crosstalk-dominated communication channels

Rohit V. Gaikwad, Richard G. Baraniuk

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present a framework for maximizing the capacity (or bit rate) of symmetric bit-rate communication services dominated by crosstalk, in particular Digital Subscriber Line (DSL) services. We assume the DSL channel is a Gaussian channel, so transmit power spectral density (PSD) design is sufficient to maximize bit rates. Using the channel, noise, and crosstalk transfer functions, we set up an optimization problem and solve for transmit PSDs that maximize the joint capacity of same-service users. Joint signaling techniques and optimal power distribution yield significant gains in bit rates (or performance margins) over current schemes. Furthermore, the designed transmit PSDs are inherently spectrally compatible with existing services on neighboring lines. We purposefully design a general framework; it does not depend on the exact choice of modulation scheme, for example. It is also extremely simple and of low computational complexity. The framework can also apply to other channels besides DSLs, such as wireless channels, coaxial cables, power lines, and telemetry cables used in geophysical well-logging tools.

Original languageEnglish
Title of host publicationConference Record / IEEE Global Telecommunications Conference
Place of PublicationPiscataway, NJ, United States
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
StatePublished - Dec 1 1999
Event1999 IEEE Global Telecommunication Conference - GLOBECOM'99 - Rio de Janeiro, Braz
Duration: Dec 5 1999Dec 9 1999


Other1999 IEEE Global Telecommunication Conference - GLOBECOM'99
CityRio de Janeiro, Braz

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change


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