Adaptive subband filtering of narrowband interference

Michael J. Medley; Gary J. Saulnier; Pankaj K. Das

doi:10.1117/12.236020

22 March 1996 Adaptive subband filtering of narrowband interference

Michael J. Medley, Gary J. Saulnier, Pankaj K. Das

Proceedings Volume 2762, Wavelet Applications III; (1996) https://doi.org/10.1117/12.236020
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

Abstract

In many communications systems, spread spectrum techniques are used to spread the original message data over a large bandwidth in order to improve system performance in the presence of narrowband interference. The extent to which such interference can be tolerated depends on the system's processing gain and may be augmented using adaptive filtering techniques. In order to mitigate narrowband interference, spread spectrum receivers can incorporate filtering techniques that suppress interference and make bit decisions on the remaining signal energy. In this paper, block transforms and multirate filterbanks based on hierarchical subband trees are used to transform the received data signal to the transform domain wherein adaptive filtering is performed. Pre- and post-correlation transform domain least-mean-squared (LMS) algorithms are employed on a block-by-block basis to suppress the narrowband interference while simultaneously minimizing the mean-squared error between the received signal and the original data message. Convergence and misadjustment noise are evaluated as functions of the underlying subband transform and various system parameters. Subsequent performance analysis of these algorithms is presented in terms of the overall system bit-error-rate. Analytical and simulation results obtained in the presence of single-tone interference sources are presented. Although not considered, the analytical expressions discussed herein can be easily extended to handle other narrowband sources such as multitone jammers and narrowband Gaussian interference.

Citation Download Citation

Michael J. Medley, Gary J. Saulnier, and Pankaj K. Das "Adaptive subband filtering of narrowband interference", Proc. SPIE 2762, Wavelet Applications III, (22 March 1996); https://doi.org/10.1117/12.236020

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available