Current research applies optimization theory to problems in digital filter design.
Areas of expertise include FIR and IIR digital fiter design, wavelet approximation, signal and image processing, and optimization theory. R. A. Vargas and C. S. Burrus, Adaptive Iterative Reweighted Least Squares Design of L p FIR Filters , Proc. 3, Signal Processing Theory and Methods, p. 1129-32, 1999. R. A. Vargas, Comparison of Interpolation Methods for ISAR Imaging , Master's Thesis, University of Texas at El Paso, El Paso, TX, August 1997. R. A. Vargas and B. C. Flores, Comparison of Interpolation Methods for ISAR Imaging , Proc. SPIE, vol.