Open Access

Blind Detection of Wideband Interference for Cognitive Radio Applications

EURASIP Journal on Advances in Signal Processing20092009:727686

https://doi.org/10.1155/2009/727686

Received: 28 January 2009

Accepted: 8 July 2009

Published: 3 September 2009

Abstract

Cognitive radio technologies are being developed which allow heterogeneous systems to share spectrum access while minimizing interference to improve the overall efficiency of spectrum usage. Thus, one important function of a cognitive radio is dynamically to avoid transmitting in occupied spectrum by detecting signals received from unknown competing systems. Robust operation requires the detection of multiple wideband interferers of unknown statistics from a single received sample vector. This paper describes the hypothesis tests that must be evaluated to perform detection of such signals and discusses several methods for performing detection. Computer simulation results are presented to show that hidden Markov modelling and power spectral analysis with edge enhancement are more robust than a simple "interference temperature-" based energy detector.

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Authors’ Affiliations

(1)
Communications Team, Industrial Research Ltd.

Copyright

© Alan J. Coulson. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.