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The effects of non-linearity in spectrum sensing receivers

Published online by Cambridge University Press:  15 July 2015

Vesa Turunen ,
Marko Kosunen ,
Sami Kallioinen ,
Aarno Pärssinen  and
Jussi Ryynänen
Vesa Turunen*
Affiliation:
Department of Micro- and Nanosciences, Aalto University, 00076 Aalto, Finland
Marko Kosunen
Affiliation:
Department of Micro- and Nanosciences, Aalto University, 00076 Aalto, Finland
Sami Kallioinen
Affiliation:
Nokia Technologies, 02150 Espoo, Finland
Aarno Pärssinen
Affiliation:
Department of Communications Engineering and Centre for Wireless Communications, University of Oulu, 90570 Oulu, Finland
Jussi Ryynänen
Affiliation:
Department of Micro- and Nanosciences, Aalto University, 00076 Aalto, Finland
*
Corresponding author: V. Turunen Email: vesa.turunen@aalto.fi
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Abstract

This paper analyses the effects of receiver non-linearity on the performance of the most commonly utilized signal detectors in cognitive radio systems. The analysis covers both self-modulation products of a single orthogonal frequency-division multiplexing (OFDM) signal and intermodulation (IM) products of two OFDM signals, and also their contribution to the probability of false detections. As a result, this work presents the linearity requirements for the spectrum sensor receiver front-end as a function of the sensitivity of the signal detector. Furthermore, we show that the cyclostationary feature detectors are more robust than the energy detectors against IM products of multiple interferers. Theoretical results are verified in measurements with a cyclostationary feature detector using digital video broadcasting – terrestrial (DVB-T) signals as an example.

Keywords

Wireless systems and signal processing (SDR, MIMO, UWB, etc.)Applications and standards (Mobile, Wireless, networks)
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 7 , November 2016 , pp. 995 - 1003
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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