A Novel Multiband Spectrum Sensing Method Based on Wavelets and the Higuchi Fractal Dimension.

Yanqueleth Molina-Tenorio,Alfonso Prieto-Guerrero,Rafael Aguilar-Gonzalez

doi:10.3390/s19061322

Yanqueleth Molina-Tenorio, Alfonso Prieto-Guerrero + Show 1 more

Open Access

https://doi.org/10.3390/s19061322

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Abstract

In this work, two novel methodologies for the multiband spectrum sensing in cognitive radios are implemented. Methods are based on the continuous wavelet transform (CWT) and the multiresolution analysis (MRA) to detect the edges of available holes in the considered wideband spectrum. Besides, MRA is also combined with the Higuchi fractal dimension (a non-linear measure) to establish the decision rule permitting the detection of the absence or presence of one or multiple primary users in the studied wideband spectrum. Methods were tested on simulated and real signals showing a good performance. The results present these two methods as effective options for detecting primary user activity on the multiband spectrum. The first methodology works for 95% of cases, while the second one presents 98% of effectivity under simulated signals of signal-to-noise ratios (SNR) higher than 0 dB.

Highlights

The cognitive radio (CR) concept is considered as a radio with the capacity to opportunely take advantage of the spectral gaps to continue transmitting [1]
Two novel methodologies based on wavelets and the Higuchi fractal dimension
Two novel methodologies based on wavelets and the Higuchi fractal dimension applied to multiband spectrum sensing were proposed

Summary

Introduction

The cognitive radio (CR) concept is considered as a radio with the capacity to opportunely take advantage of the spectral gaps to continue transmitting [1]. CR techniques provide the ability to use or share the spectrum in a timely manner and operate in the best available channel. In this way, CR technology will allow to secondary users (SUs), called unlicensed users, to determine what parts of the spectrum are available and detect the presence of licensed users or primary users (PUs). The CR paradigm involves the stages of sensing, decision, sharing, and mobility of the spectrum [3]. The first stage of CR, i.e., spectrum sensing (SS), is fundamental to determine the presence of PUs and it is the goal of this work

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Results

Conclusion