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Spectrum sensing is an essential functionality of cognitive radio networks (CRN). Among existing spectrum sensing methods, cooperative spectrum sensing is the best one which can achieve superior sensing performance by introducing spatial diversity of sensing data sources. Such cooperation also introduces additional information exchanging which leads to extra power consumption and reporting delay....
Information system based on the demand-driven, function-oriented and software life cycle, inevitably had to make excessive abstraction of the richness of the data and application, and then unable to deal with the rapid demand changes, business innovations and organizational changes. In this paper, a user-based query network (UBQN) design is proposed, which designs an interactive Q & A system by...
Cooperative transmission technique is now widely considered as a promising approach to combat fading and achieve energy efficiency in wireless networks. In this paper we focus on the routing problem in energy-constrained wireless sensor networks (WSNs), of which a cooperative MISO-based routing strategy is adopted. We first analyze the physical layer energy consumption model of cooperative transmission...
Although static sensor nodes have low computation and communication capabilities, they have specific properties, and can acquire stable neighboring nodespsila information, which can be used for detection of anomalies in networking and behaviors of the neighbor nodes, thus providing security for wireless sensor networks. In many attacks against sensor networks, the first step for an attacker is to...
In cognitive radio networks, secondary users (SUs) opportunistically exploit the spectrum unutilized by primary users (PUs). In this paper, we study the secondary communication where secondary transmitters and receivers have different available spectrum. Considering the spectrum diversity and the space distance between different PUs, we introduce cognitive relay node into the secondary communication...
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