Bradley Department of Electrical & Computer EngineeringVirginia Tech
Title Interference Suppression with Minimal Signal Distortion
Author(s) A. A. (Louis) Beex and James R. Zeidler
Document Type Conference Proceeding
Conference IEEE Int'l Conference on Acoustics, Speech, and Signal Processing
Publication Information Volume 4, Pages 225-228
Conference Date Hong Kong, 6-10 April 2003
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Abstract

We propose a two-stage adaptive filtering process for canceling narrowband interference from a wideband signal process, based on a reference signal consisting of a Doppler shifted version of the interference. The first stage uses the time-varying behavior of NLMS with large step-size to produce an estimate of the interference signal, in which the Doppler shift is mitigated. The second stage uses NLMS with small step-size, as an approximation to the Wiener filter, in order to modify amplitude and phase of the Doppler-mitigated reference signal so that an estimate of the interference signal is produced suitable for interference cancellation. Simulations with a wideband QPSK signal corrupted by strong sinusoidal interference, for which a Doppler shifted reference is available, show the performance of the proposed approach in terms of signal-to-interference ratio and bit-error rate improvement.

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