Title :
FPGA implementation of adaptive heterodyne filters
Author :
Soderstrand, Michael A. ; Nelson, Karl E. ; Wen Feng Leong ; Soo, Hooi Miin ; Azam, Asad ; Sasidaran, D.
Author_Institution :
Sch. of Electr. & Comput. Eng., Oklahoma State Univ., Stillwater, OK, USA
fDate :
Oct. 29 2000-Nov. 1 2000
Abstract :
A tunable heterodyne filter makes use of the heterodyne process to create a tunable notch filter from a fixed coefficient high-pass filter. Through the use of a simple second-order IIR band-pass filter to detect the narrow-band interference, it is possible to generate a signal that can be used to see the heterodyne frequency to match the tunable heterodyne notch filter to the center of the detected interference. The result is a single-chip adaptive heterodyne notch filter that can adapt a very high order notch filter to the center of the narrow-band interference to substantially attenuate the interference.
Keywords :
IIR filters; adaptive filters; band-pass filters; circuit tuning; field programmable gate arrays; heterodyne detection; high-pass filters; interference suppression; notch filters; FPGA; fixed-coefficient high-pass filter; narrow-band interference detection; second-order IIR band-pass filter; single-chip adaptive heterodyne filter; tunable notch filter; Adaptive filters; Band pass filters; Digital filters; Field programmable gate arrays; Finite impulse response filter; Frequency; IIR filters; Interference; Low pass filters; Prototypes;
Conference_Titel :
Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-6514-3
DOI :
10.1109/ACSSC.2000.910981
