NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Spectrum sharing through distributed coordination in dynamic spectrum access networks
Wireless Communications & Mobile Computing - Cognitive Radio, Software Defined Radio And Adaptive Wireless Systems
What and how much to gain by spectrum agility?
IEEE Journal on Selected Areas in Communications
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Cognitive radio technology necessitates accurate and timely sensing of the primary users' activity on the chosen set of channels. We assume that sensing is performed by a number of nodes in a personal area network (PAN), and that sensing results are collected by the PAN coordinator which combines them to form a coherent channel map. The simplest selection procedure is a simple random choice of channels to be sensed; to reduce the delay in detecting the end of spectral opportunities, different sensing probabilities are assigned to active and inactive channels. To improve the accuracy of the sensing process even further, we propose to modulate the sensing probabilities according to the duration of active/inactive periods, or according to the time of last sensing event. The paper analyzes the performance of these policies and discusses the range of parameters in which they lead to a reduction of sensing error.