UNDER CONSTRUCTION
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Active Projects:
| Wireless Channel Security for Wireless Networks - Methods for making Personal Communications Systems secure from channel interference, interception, and spoofing | Delta-Sigma Data Converter Stability |
| Distortion Reduction in High-Power RF Amplifiers - Signal processing methods for reducing distortion in RF amplifiers employing Envelope Elimination and Restoration (EER) | .................................................................................... |
UNDER CONSTRUCTION
The behavior of cascaded and crosscoupled estimators for separating AM and FM/PM signals was studied. Theoretical results were derived that approximately describe the process. In essence, for FM/PM signals the estimators work by the capture effect. Simulations were made for different types of signals and interferers. Performance limits were determined by exhaustive simulation. Carrier amplitude estimators were developed and validated. Also some techniques for separating signals that are not based on the capture effect were developed.
A design method was developed for FIR digital filters with complex coefficients that approximate non-conjugate symmetric frequency responses of arbitrary amplitude and frequency shapes. The method was also adapted for the design of differentiators and Hilbert transformers.
Steve F. Russell, Ph.D., P.E.
Department of Electrical and Computer Engineering
3107 Coover Hall
Iowa State University
Ames, Iowa 50011
sfr@iastate.edu Phone: (515)-294-1273
Fax: (515)-294-8432
Created Apr 1, 1995, Revised: Mar 6, 1999