Cooperative spectrum sensing study using Welch periodogram

Atso Hekkala, Ilkka Harjula, D. Panaitopol, Teemu Rautio, R. Pacalet

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    5 Citations (Scopus)


    Spectrum sensing is one of the crucial tasks for enabling the use of the cognitive radios. In this paper, we study cooperative spectrum sensing using the Welch periodogram in different fading channel environments. We consider the performance of the Welch periodogram using receiver operating characteristic curves for single- and multicarrier signals. In the cooperative sensing, we study how the number of the cooperative users affects the selection of the reasonable combining rules. In addition, we present the idea of the simultaneous sensing of several sub bands. Finally, we discuss the implementation aspects of the Welch periodogram. In particular, we study the complexity reduction by shortening the length of Fast Fourier Transform (FFT) used in the Welch periodogram. Our theoretical and simulation results indicate that the parameters for the Welch periodogram should be carefully selected to achieve the best performance. In addition, by using smaller FFT sizes, we are able to reduce the complexity of the Welch periodogram without any degradation on the performance. We show that its practical implementation is possible with any existing baseband processor. Finally, we show that the sensing performance can be significantly improved by increasing the number of the cooperative users at the cost of the signalling overhead over the network. (11 refs.)
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publication11th International Conference on Telecommunications, ConTEL 2011
    Place of PublicationPiscataway, NJ, USA
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Print)978-1-61284-169-4, 978-9-5318-4152-8
    Publication statusPublished - 2011
    MoE publication typeA4 Article in a conference publication
    Event11th International Conference on Telecommunications, ConTEL 2011 - Graz, Austria
    Duration: 15 Jun 201117 Jun 2011


    Conference11th International Conference on Telecommunications, ConTEL 2011
    Abbreviated titleConTEL 2011


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