B.S.E.E. New Jersey Institute of Technology, Newark, NJ, 1976
M.S.E.E. Rensselaer Polytechnic Institute, Troy, NY, 1977
Ph.D.
(E.E.) Rensselaer Polytechnic Institute, Troy, NY, 1981
Communications and information processing area. Special interests include stochastic processes in communication, detection and estimation theory, information theory and coding, multidimensional digital signal processing, optical communications systems.
Present research activities are focused on data/bandwidth compression techniques in the context of image coding and transmission, including: combined source and channel encoding of image data with emphasis on the use of two-dimensional (2-D) Differential Pulse Code Modulation methods; communication system performance evaluation using different modulation and coding strategies in conjunction with both Gaussian and fading channel characterizations; and application of rate-distortion theoretic principles to image transmission system design and the development of performance bounds.
Recent research efforts include investigation of combined source-channel coding approaches to 2-D transform and hybrid image coding techniques; development of new rational rate convolutional code constructions and decoding procedures; stochastic image modeling and segmentation for real-world imagery analysis and/or transmission; and analysis of fiber optic communication systems.
a) Image Modeling for Image Data Compression Investigation of the relative merits of several stochastic image models in their ability to describe real-world image characteristics and utility in designing image data compression schemes. In this study attention is focused on developing spatially-discrete image models having parameters related to essential image features such as pixel-to-pixel correlation and edge structure. Investigation of image coding methods exploiting nonstationary image statistics.
b) Data Compression and Error Correction for Image Communications Systems Development of theoretical approaches and computer algorithms for data/bandwidth compression and error correction of digital television signals. Design of 2-D predictive encoding and transform techniques for low bit-rate image transmission. Applications to satellite and space communications are considered as well as packet video transmission over networks.
c) Digital Modulation Techniques and Channel Modeling Digital communication system performance evaluation using efficient modulation and convolutional channel encoding strategies including TCM and CPM. Development of a combined source- channel- modulation system structure optimized for bandlimited channels. Establishment of computer simulation methodologies for complex systems.
d) Fiber Optic Communication Techniques The study of single-mode fibers as an optical transmission link in conjunction with various modulation techniques. Effects of fiber characteristics on digital communication system performance. Investigation of direct and coherent receiver structures for a variety of standard and experimental fibers. Analysis of systems employing optical fiber amplifiers. Analytical characterization of optical wavelength division multiplexed communication systems.