Kiran George, Ph.D.
Assistant Professor of Computer Engineering
Collaborative research with the with Dr. Henry Chen, Dept. of Electrical Engineering,
Wright State University, Dayton, Ohio and Air Force Research Laboratory(AFRL),
Wright-Patterson Air Force Base, Dayton, Ohio
One of the most predominant trends in modern microwave signals is the move toward wider bandwidths. Analog wideband receiver designs can accommodate the technology-stressing bandwidths, but come at a cost of reduced flexibility. Digital approaches, on the other hand, provide flexibility in receiver signal processing, but they are limited by analog-to-digital converter resolution and power consumption.
The goal of this research is to design and implement a 1-GHz signal bandwidth digital receiver which uses the Kaiser Window function and compensation technique. The Kaiser Window reduces the spectral leakage by eliminating the discontinuities at the time window edges and the compensation uncovers the weak signal for extension of the two-signal spurious free dynamic range (SFDR) of the receiver. The combination of both techniques extends the two-signal SFDR of the receiver to 24 dB. A novel hardware implementation using look-up tables for FFT, Kaiser Window and the compensation method is being developed. We are also exploring algorithms for multiple signal detection and data modulation using a configurable wideband digital receiver.