Mobility

Cognitive Radios in Cooperative Environment: Detection, Sensing and Clustering of Spectral Bands

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Executive Summary

The cognitive radio allows spectrum sharing between licensed users (primary users) and many unlicensed users (secondary users). The secondary users are only allowed to use a licensed spectrum in the absence of its rightful owner. Thus, the ability to accurately sense the presence of the rightful owners is highly essential. In this paper, a novel Cooperative Spectrum Sensing (CSS) approach to efficiently sense a wideband spectrum is introduced. This paper addresses two specific issues in CSS. The first issue is on dynamic detection of primary user's bands. A Dynamic Band Clustering (DBC) algorithm that uses K-means clustering technique is proposed in this paper. The proposed algorithm reduces the number of erroneous narrow sub-bands resulting from spurious noise.

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