NDLI: Adaptive Analog Nonlinear Algorithms and Circuits for Improving Signal Quality in the Presence of Technogenic Interference

Content Provider	IEEE Xplore Digital Library
Author	Nikitin, A.V. Davidchack, R.L. Sobering, T.J.
Copyright Year	2013
Description	Author affiliation: Avatekh Inc., Lawrence, KS, USA (Nikitin, A.V.) \|\| Dept. of Math., Univ. of Leicester, Leicester, UK (Davidchack, R.L.) \|\| Electron. Design Lab., Kansas State Univ., Manhattan, KS, USA (Sobering, T.J.)
Abstract	We introduce algorithms and conceptual circuits for Nonlinear Differential Limiters (NDLs), and outline a methodology for their use to mitigate in-band noise and interference, especially that of technogenic (man-made) origin, affecting various real, complex, and/or vector signals of interest, and limiting the performance of the affected devices and services. At any given frequency, a linear filter affects both the noise and the signal of interest proportionally, and when a linear filter is used to suppress the interference outside of the passband of interest, the resulting signal quality is invariant to the type of the amplitude distribution of the interfering signal, as long as the total power and the spectral composition of the interference remain unchanged. Such a linear filter can be converted into an NDL by introducing an appropriately chosen feedback-based nonlinearity into the response of the filter, and the NDL may reduce the spectral density of particular types of interferences in the signal passband without significantly affecting the signal of interest. As a result, the signal quality can be improved in excess of that achievable by the respective linear filter. The behavior of an NDL filter and its degree of nonlinearity is controlled by a single parameter in a manner that enables significantly better overall suppression of the noise compared to the respective linear filter, especially when the noise contains components of technogenic origin. Adaptive configurations of NDLs are similarly controlled by a single parameter, and are suitable for improving quality of non-stationary signals under time-varying noise conditions. NDLs are designed to be fully compatible with existing linear devices and systems, and to be used as an enhancement, or as a low-cost alternative, to the state-of-art interference mitigation methods.
Sponsorship	IEEE Commun. Soc.
Starting Page	1145
Ending Page	1154
File Size	1375901
Page Count	10
File Format	PDF
ISBN	9780769551241
DOI	10.1109/MILCOM.2013.197
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Noise Bandwidth Receivers Passband Thermal noise Q-factor technogenic interference analog signal processing electromagnetic interference in-band noise man-made interference non-Gaussian noise nonlinear differential limiters nonlinear filtering signal quality
Content Type	Text
Resource Type	Article

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