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In wireless sensor networks, clustering schemes have been adopted as an efficient solution to prolong the network lifetime. In these schemes, the performance of energy-efficient data transmission is affected the cluster ratio (CR). This paper analyzes the optimal CR from the perspective of network energy efficiency, and its impact on the network lifetime. In order to provide a generic analytic model,...
Applying cognitive radio technologies to wireless sensor networks (WSNs) explores new possibilities for network architectures. The cognitive radio technology enables opportunistic access of unlicensed sensor nodes to licensed bands without influencing primary users (PUs). Spectrum sensing is a key technology to identify the presence of PUs. Benefit from the diversity of different sensors, Cooperative...
In this paper, we primary focus on prolonging the network lifetime of wireless sensor networks (WSN), since the small, portable batteries integrated into the sensor chips can not be re-charged easily from an economical point of view. We first made a further analysis about the relationship between energy consumption and hop number. Then, an optimal hop number is deduced for minimizing the energy consumption...
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