Differential sensing in cognitive personal area networks with bursty secondary traffic and varying primary activity factor Online publication date: Mon, 30-Mar-2009
by Jelena Misic, Vojislav B. Misic
International Journal of Autonomous and Adaptive Communications Systems (IJAACS), Vol. 2, No. 1, 2009
Abstract: Cognitive radio technology necessitates accurate and timely sensing of primary users' activity on the chosen set of channels. We assume that the number of sensing nodes is smaller than the number of channels; the results of sensing are cooperatively combined to form a coherent channel map. Since each secondary user has its own bursty data traffic, it is unavailable for sensing until that data is transmitted. Furthermore, we assume that idle channels ought to be sensed more frequently than the active ones, so that the end of transmission opportunities are sensed with greater accuracy. The article presents a probabilistic analysis of the sensing mechanism under these circumstances, and investigates the range of parameter values in which the sensing process is capable of maintaining an accurate view of the status of the working channel set.
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