Spectral Optimization for Communication in the
Presence of Crosstalk
Rohit Gaikwad
(rohitg@rice.edu)
Electrical and Computer Engineering, Rice University
Richard Baraniuk (richb@rice.edu)
Electrical and Computer Engineering, Rice University
This paper presents a general framework for designing optimal transmit spectra
for communication services dominated by crosstalk --- for example Digital
Subscriber Lines (DSLs) and wireless LANs.
Using the channel, noise, and interference transfer functions,
we set up and solve an optimization problem to maximize the joint
channel capacity.
We employ joint signaling techniques and optimal power distribution to
yield significant gains in bit rates (or performance margins).
Furthermore, by design, the spectra are spectrally compatible with
existing neighboring services. The framework is quite general; it does
not depend on the exact choice of the modulation scheme, for example. It is
also extremely simple and of low computational complexity.