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

Volume

1

fYear

2000

fDate

Oct. 29 2000-Nov. 1 2000

Firstpage

375

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on

Conference_Location

Pacific Grove, CA, USA

ISSN

1058-6393

Print_ISBN

0-7803-6514-3

Type

conf

DOI

10.1109/ACSSC.2000.910981

Filename

910981