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In this paper, we study a more practical cognitive radio (CR) scenario where the primary user (PU) operates under more than one transmit power levels. Different from the existing research where PU is assumed to have only one constant transmit power, the new consideration well matches the existing and ongoing standards, i.e., ШЕЕ 802.11 Series, GSM, LTE, LTE-A, etc. The primary target in this new consideration...
In this paper, we propose a novel transmission probability scheduling scheme for opportunistic spectrum access in cognitive radio networks. With the proposed scheme, the secondary user's throughput over a single channel is maximized while collision probability perceived by the primary user is constrained under a required threshold since the secondary user optimally schedules its transmission probabilities...
In this paper, we propose a novel spectrum sensing technique, called as multi-slot spectrum sensing, to detect spectral holes and to opportunistically use under-utilized frequency bands without causing harmful interference to legacy (primary) networks. The key idea of the proposed sensing scheme is to combine the observations from the past N (N ?? 2) sensing blocks including the latest one. Specifically,...
Spectrum sensing is a crucial technology for cognitive radio networks. In this paper, we develop a novel spectrum sensing method for secondary users to sense the idle spectrum. The key idea of the proposed method is combining multiple slots energy detection. Firstly, we establish the probability model regarding the appearance of the primary user at each slot of a secondary user slots window structure...
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