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After a decade of extensive research on application-specific wireless sensor networks (WSNs), the recent development of information and communication technologies makes it practical to realize the software-defined sensor networks (SDSNs), which are able to adapt to various application requirements and to fully explore the resources of WSNs. A sensor node in SDSN is able to conduct multiple tasks with...
In cognitive radio networks (CRNs), wideband spectrum sensing is an important task for secondary users (SUs) to achieve the dynamic spectrum access. Even though the wideband spectrum detection is feasible by combining the compressive sensing (CS) with wavelet transform, however, accurate detection of the small-scale primary users (SSPUs) such as wireless microphones and mobile devices is still difficult...
In cognitive radio networks, secondary users (SUs) need to sense/detect the vacant spectrum holes in a wide frequency band for achieve the dynamic spectrum access. The combination of compressive sensing (CS) with wavelet edge detection makes the wideband spectrum reconstruction and detection to be feasible. The existence of small-scale primary users (SSPUs) such as wireless microphones and mobile...
After a decade of extensive research on application-specific wireless sensor networks (WSNs), the recent development of information and communication technologies make it practical to realize software-defined sensor networks (SDSNs), which are able to adapt to various application requirements and to fully explore the resources of WSNs. In SDSNs, wireless sensor nodes can be dynamically reprogrammed...
A novel robust detection algorithm based on goodness-of-fit test is proposed to achieve spectrum sensing for the small-scale primary users (SSPUs) including wireless microphones and mobile devices. In the proposed algorithm, a new test statistic is proposed to measure the non-Gaussianity of the power spectral density (PSD) of the received signals. Since the estimated PSD of the ambient Gauss noise...
A novel goodness-of-fit testing based spectrum sensing method is proposed to detect the small-scale primary users (SSPUs) such as wireless microphones and mobile devices. In the proposed method, a secondary user (SU) measures the non-Gaussianity of the spectrum of the received signal using a novel test statistic. Then, the absence and presence of SSPUs can be effectively distinguished by evaluate...
This paper studies the design of a wireless data acquisition system applied in greenhouse by building a wireless sensor network based on ZigBee. The system includes acquisiton terminals, routing nodes, an ethernet gateway and a server. The terminals are solar powered with no external power supply, which can be flexibly deployed. Through multiple sensors connected to it, the system can collect the...
In clustering wireless sensor networks, cluster-head nodes are backbone network to process and transmit data. Vast intra-cluster nodes obtain sleep, reduce data delay, lighten cluster head burden. In this paper, we derived the smallest active node number K, and achieved a new intra-cluster active nodes scheduling algorithm. The experimental results show that the result of the algorithm in saving energy...
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