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The directional antenna provides energy focusing in a specific direction, therefore becoming an effective energy-saving solution. In this paper, we consider energy saving problem in a further way by resource allocation in base station equipped with direction-variable antennas. Besides the total power limitation and the total time slot limitation, the concurrent transmissions are also limited by the...
Anonymous communication is a challenging task in resource constrained wireless sensor networks (WSN). However, anonymity is important for many sensor networks, in which we want to conceal the location and identify of important nodes (such as source nodes and base stations) from attackers. Existing WSN anonymous protocols either cannot achieve complete anonymity, or have large computation and/or storage...
Cooperative spectrum sensing taking into account the error effect on the sensing information reporting is studied. Employing the relay, a novel cooperative spectrum sensing algorithm based on network coding is proposed by correcting the received sensing information. The efficiency of the algorithm and the method of relay selection are given. The simulation results show that the performance of the...
In cognitive radio systems, unlicensed users can use the frequency bands when the licensed users are not present. Hence reliable detection of available spectrum is the foundation of cognitive radio technology. In order to efficiently detect the licensed users under prior knowledge constraints in the fusion center, a novel cooperative spectrum sensing algorithm based on Dempster-Shafer theory is proposed...
In cognitive radio systems, unlicensed users can use the frequency bands when the licensed users are not present. Hence reliable detection of available spectrum is the foundation of cognitive radio technology. To ensure that the unimpaired operation of licensed users and to improve the spectrum sensing performance, a novel cooperative spectrum sensing algorithm based on credibility is proposed. In...
We considered the problem of use the reliability of unlicensed users for cooperative spectrum sensing in cognitive radio systems by analyzing the Huffman encoding algorithm. We present a novel cooperative spectrum sensing algorithm in cognitive radio systems. We drive the close-form expressions for the average sending bits for each unlicensed user for cooperation and expression for the probability...
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