Title :
Comparison of two techniques for attenuation of narrow-band interference in spread-spectrum communication systems
Author :
Soderstrand, Michael A. ; Jenkins, W. Kenneth
Author_Institution :
Univ. of California, Davis
Abstract :
A new adaptive notch filter based on the complex heterodyne approach achieves better performance than a similar filter designed using the popular Gray-Markel all-pass lattice circuit. Both adaptive filters make use of a simple second-order FIR adaptive filter using the LMS algorithm to detect the narrow-band interference. The Gray-Markel filter is tuned to the narrow-band interference by adjusting one parameter in the lattice circuit, while the complex heterodyne filter is fixed with the heterodyne frequency adjusted to the narrow-band interference. The new adaptive filter is able to respond to changes in the narrow-band interference frequency more quickly and provides better attenuation during the transition than does the popular Gray-Markel filter.
Keywords :
FIR filters; adaptive filters; all-pass filters; electromagnetic wave scattering; heterodyne detection; interference (signal); lattice filters; least mean squares methods; notch filters; spread spectrum communication; FIR adaptive filter; Gray-Markel all-pass lattice circuit; LMS algorithm; adaptive notch filter; attenuation; complex heterodyne filter; heterodyne frequency; narrow-band interference; spread-spectrum communication system; Adaptive filters; Adaptive systems; Attenuation; Circuits; Finite impulse response filter; Frequency; Interference; Lattices; Narrowband; Spread spectrum communication;
Conference_Titel :
Circuits and Systems, 2007. MWSCAS 2007. 50th Midwest Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
978-1-4244-1175-7
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2007.4488737
