Saleem A. Kassam
Research Interests:
- Communication Systems and Signal Processing:
Research in communication systems is directed at
problems of equalization,
modulation, and coding.
One area of interest has been blind equalization and equalization of
nonlinear
channels using nonlinear signal processing techniques.
For wireless channels, we are interested in new
combinations of diversity, modulation, and coding techniques that
yield good performance under severe fading and multipath conditions.
Spectrally efficient modulation schemes such as GMSK are of particular
interest.
We are also interested in nonlinear signal processing techniques for
applications in interference rejection, image restoration, recognition,
and prediction.
Detection and estimation under conditions of non- Gaussian noise is a
general
problem area under study, with applications in radar and sonar systems.
We are also developing new methods of blind signal separation
based on independent component analysis (ICA) with applications in
signal
separation and equalization of linear channels.
-
High-Resolution Imaging Arrays:
For high resolution imaging with low sidelobe levels
for the point spread function, large physical apertures filled with a
large
number of array elements are generally needed. Our work has allowed
characterization
of all such imaging systems through the coarray, and this makes it
possible
to explore good reduced redundancy and minimum redundancy array
geometries.
Research on this aspect of imaging systems is producing new results for
minimum redundancy and minimum complexity active as well as passive
plane
and line arrays. Other related research directions that are being
pursued
include analysis and design of multi-frequency arrays,
'super-resolution'
techniques based on the coarray characterization, and applications of
the
coarray idea and redundancy reduction in the design of efficient
digital
filter structures.