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Modeling and mitigation of nonlinear distortion in wideband A/D converters for cognitive radio receivers

Published online by Cambridge University Press:  27 April 2010

Markus Allén ,
Jaakko Marttila  and
Mikko Valkama
Markus Allén*
Affiliation:
Department of Communications Engineering, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland.
Jaakko Marttila
Affiliation:
Department of Communications Engineering, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland.
Mikko Valkama
Affiliation:
Department of Communications Engineering, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland.
*
Corresponding author: M. Allén Email: markus.allen@tut.fi
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Abstract

This article discusses the reduction of nonlinearities in analog-to-digital (A/D) converters using digital signal processing (DSP). Also modeling of certain essential nonlinearities is considered in detail. The main focus is on wideband radio receivers, such as the emerging cognitive radio applications, where a collection of signals at different frequency channels is converted to digital domain as a whole. Therefore, the overall dynamic range can easily be in the order of tens of dBs and thus even mild nonlinear distortion can cause strong carriers to block weaker signal bands. In this article, a mathematical model for clipping distortion due to improper input signal conditioning is derived through Fourier analysis. Additionally, stemming from the analysis an adaptive DSP-based post-processing method for reducing the effects of clipping and integral nonlinearity (INL) in A/D converters is presented with illustrative examples using both computer simulations and laboratory radio signal measurements.

Keywords

A/D converterCognitive radio receiverNonlinear distortionIntegral nonlinearityClippingInterference cancelation
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 2 , Issue 2 , April 2010 , pp. 183 - 192
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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