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For successful Opportunistic Spectrum Access (OSA) using spatial information, accurate localization is a crucial first step. In this paper, the authors consider a group of unlicensed (secondary) nodes that collaboratively localize a target licensed (primary) transmitter. They propose an optimal hybrid localization scheme based on Signal Strength (SS) and Angle-Of-Arrival (AOA) measurements. Such a localization scheme may play an important role in the sensing mechanisms of cognitive radios employing OSA, which is seen as a promising approach to solving the problem of spectrum scarcity.
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