AUTHORS: Yongju Xian, Long Xu, Ruijie Li
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ABSTRACT: In cognitive radio networks, secondary users may temporarily occupy dynamic sub-channels originally authorized to primary users. With the increase of the number of aggregated dynamic channels for secondary users, there is an increase of collision probability leading to degradation of the overall system. In this paper, the effects of the number of aggregated dynamic sub-channels on the collision probability are studied, and the system capacity is analyzed. Based on this, an aggregation scheme is designed. By the scheme and under collision probability constraint, the optimal number of aggregated dynamic sub-channels is obtained. Simulation results show that the optimal number of aggregated channels and the maximum capacity are gained while the collision probability is bounded below the collision tolerable level.
KEYWORDS: multi-type spectrum, collision constraint, collision probability, dynamic sub-channel, spectrum aggregat
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