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This paper proposes a space division multiplexing aided opportunistic spectrum access (SDM-OSA) scheme for cognitive radio networks by exploiting the spatial signal processing ability provided by multiple antennas. With the scheme, cognitive transmission could be carried out using SDM even though there is no idle spectrum resource available. We make further discussion about antenna requirements for...
In the cognitive radio networks, the cognitive user must scan the multi-channel to acquire an idle channel before its cognitive transmission. If the sensing capability is limited, the user must sense the multi-channel one by one. So the sensing order is very crucial to the realization of maximum throughput. In this paper, we aim to find the optimal wideband sensing order in polynomial time which is...
We consider a cognitive network consisting of n cognitive users uniformly distributed with constant density among primary users. Each user has a single transmitter and a single receiver, and the primary and cognitive users transmit concurrently. The cognitive users use single-hop transmission in two scenarios: (i) with constant transmit power, and (ii) with transmit power scaled according to the distance...
The current regulation of static spectrum distribution is a key factor that results in underutilization of fruitful wireless spectrum. Cognitive transmission must be predetermined to resolve the problems in the future network. In this paper, two kinds of cognitive channel, which are mutual interference cognitive channel with and without cognitive relay, will be modeled and analyzed. In mutual interference...
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