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Internet of Things (loT) aims at collecting data from billions of devices connected altogether. Despite there is no one technology able to cope with all possible scenarios, LPWAN solutions are emerging as viable technologies for implementing private, low-cost cellular like wireless networks. Distributed systems could leverage this approach as a driving technology for services as smart environment...
Cognitive radio (CR) sense the spectrum to discover the available white spaces in it for making better utilization of spectrum and alleviates the spectrum shortage problem. While using the available spectrum, it avoids the harmful interference with licensed users or primary users (PUs). Individual spectrum sensing by CR may not be accurate due to fading and shadowing effects. Cooperative spectrum...
Spectrum sensing is the most appropriate method performed by cognitive radio for the efficient utilization of RF spectrum without any harmful interference to the primary users. In this paper, we propose various spectrum sensing technique. Based on spectrum sensing, cooperative sensing is done over various spectrum sensing technique to overcome the problem of miss detection and false alarm which is...
To cope with the interference between UWB system and traditional narrow band wireless systems, CR (Cognitive Ratio) technology is introduced into UWB. The CUWB (Cognitive UWB) system realized by IR needs to generate sending pulse waveform whose spectrum can be adapted to the changing spectrum environment. In this paper, a CUWB pulse design method based on CSS is presented. The pulses designed by this...
Recently there have been many research topics in wireless sensor networks (WSN) for efficiently monitoring the environments, and localizing, detecting, and classifying targets of interest. Most of these researches assume that the environment to be stable. On the other hand, if the sensor nodes are deployed randomly, the establishing connection between the sensor nodes is critical importance. In this...
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