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Artificial bee colony (ABC) algorithm is a biological-inspired optimization algorithm, which has been shown to be competitive with some biological-inspired algorithms, such as differential evolution, genetic algorithm and particle swarm optimization. In this paper, the work in defining a general framework for spectrum allocation in cognitive radio systems is described, and a method using ABC algorithm...
This paper addresses the problem of energy detection of a primary signal in a cognitive radio environment over Nakagami channels. As an extension to the previous works, we start with the no diversity case, and present some alternative closed-form expressions of detection probability under Nakagami channels. Then we pay much attention to studying the square-law combining technology when wireless users...
In cognitive radio networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the sensing performance of a cognitive user U1 by allowing another cognitive radio user U2 to act as its relay (cooperation). We take the average power rather than the instantaneous power as the decision statistic, so, we can use multiple signal samples in each...
In cognitive radio networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the improvement on sensing performance for a cognitive user U1 by allowing another cognitive radio user U2 to act as its relay, when there is transmit power constraint for the relay U2. We first propose a novel numerical model for sensing performance analysis,...
In cognitive networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the sensing performance of a cognitive user U1 by allowing another cognitive user U2 to act as its relay. We vary the scaling factors (used by the relay U2 to amplify its received signal) of the unconstrained scheme (there is not power constrain for relay), and develop...
In cognitive networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. The difference of sensing performance between totally cooperative networks and partially cooperative networks (network cooperation gain) is studied in this paper. In a two user partially cooperative network, cognitive users U1 and U2 share their sensing results. While in a totally cooperative...
In cognitive networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the improvement in sensing performance of a cognitive user U1 by allowing another cognitive user U2 to act as its relay. We derive the expression of SNR, and exploit the improvement in SNR to explain why the sensing performance may be improved by using cooperation...
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