Systems Seminar
Equalization and Exploitation of Receiver Nonlinearities
Gil Raz
Abstract
In many RF receivers nonlinear device behavior is a fundamental limit to
receiver performance. Classical methods for digitally reducing nonlinear
distortion have proven to be computationally onerous or of limited
practical use for wideband channels. In this talk we explore some aspects
of mitigation of such distortions as well as the possibility of exploiting
them. The discussion includes a description of the complexities of the
problem at hand during identification and real-time operation along with
some of the approaches to overcoming them. These approaches include the
possibility of replacing the combinatorial task of finding an optimal
sparse description for a nonlinear system with a fast approach similar to
methods of compressed sensing. Further, we explore the notion of
compressed excitation, allowing for system identification using signals
that do not provide persistent excitation, but which are nonetheless
sufficient. Finally, we briefly touch on the notion of using nonlinear
distortions as a form of signal diversity such that nonlinearities are
actually desirable and help reduce sample rate or increase overall
receiver dynamic range.
Time and Place: Tue. Sep. 19 at 4 pm in 2540 EH
*** NOTE SPECIAL DAY, TIME, & PLACE ***
SYSTEMS SEMINAR WEB PAGE:
http://homepages.cae.wisc.edu/~gubner/seminar/schedule.html