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In this paper, we present a cross-layer perspective on data transmission in energy harvesting cognitive radio networks. The physical layer power allocation and network layer delay are jointly considered. The delay optimal power allocation is studied under the intermittence of harvested energy, the randomness of data generation, the variation of channel state, and the uncertainty of the grid price...
In spectrum sharing environments of cognitive radio (CR), secondary users are permitted to share the primary user's spectrum only if limited interference to the primary user can be guaranteed. On the other hand, when multiple CR users share the same channel at one time, the total throughput of the CR networks can be maximized by allocating the common radio resource to the CR users with the best channel...
Spectrum sensing is one of the major elements of cognitive radio applications. A single secondary user (SU) usually cannot provide robust sensing capability due to channel effects. In order to overcome this problem, cooperative spectrum sensing techniques have been proposed. Because conventional cooperative spectrum sensing schemes assumed that all sensing nodes have the same sensing reliability,...
In cognitive radio networks, knowledge of the position of the primary users is very important as it can be used to avoid harmful interference to the primary users, while at the same time be exploited to improve the spectrum utilization. In this paper, a semi range-based localization algorithm is proposed for the secondary users in cognitive radio networks to estimate the positions of the primary users...
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