In face of rarer and rarer wireless spectrum resources, Cognitive Radio is proposed, in order to improve spectrum usage efficiency through reusing licensed channels. The key point of cognitive radio is that without disturbing primary user, the secondary user could find idle channels for their own data transmission through spectrum sensing. So spectrum sensing is
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Cognitive Radio (CR) technology is a new revolutionary mode of information communication. How exactly to find―spectrum hole‖and the rational use of the discovery of―spectrum hole‖capability as its core idea. An application of cognitive radio technology can take advantage of detecting―spectrum hole‖, in order to improve spectrum utilization. Spectrum sensing technology is the key integrant in
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The article focuses on the key technology of cognitive radio frequency spectrum detection. This paper discusses how to use the difference of the polarization information of the signal and the noise for spectrum detection, and propose several polarization detection algorithms under different conditions. analyze the performance of the polarization detection on the condition of the
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The problem of spectrum resource scarcity is becoming more and more serious as the number of wireless communication devices developing rapidly. Cognitive Radio (CR) technology can solve the problem effectively. CR is a revolutionary technology of the wireless mobile communication area; users can detect all the opportunities of utilizing spectrum in the wireless network environment,
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The problem of spectrum resource scarcity is becoming more and more serious as the number of wireless communication devices developing rapidly. Cognitive Radio (CR) technology can solve the problem effectively. CR is a revolutionary technology of the wireless mobile communication area; users can detect all the opportunities of utilizing spectrum in the wireless network environment,
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With the rapid development of wireless communication currently, the problem of shortage of wireless spectrum is increasingly serious. As a matter of fact, too much load is depending on some of frequency bands in the current network, but still so many spectrums have fewer efficiency of utility. In the light of this situation, people considered
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With the rapid development of science and technology, wireless communication plays a more and more important part in daily lives. However, due to the fixed spectrum allocation policy, spectrum utilization gets lower and spectrum resources become scarce, which have been a major factor of restricting the wireless communication development. The proposed idea of cognitive radio
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With the rapid development of communication technology and the growing increasement in wireless communication services, people pay much attention to the increasingly scarce spectrum resources. The technology of cognitive radio provides a strong technical support in solving the scarce spectrum problem, management for the dynamic spectrum and improvement in spectrum efficiency. Spectrum sensing of cognitive
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Nowadays, as the shortage of spectrum resource becomes a serious problem, how to save the spectrum resource and how to utilize the spectrum more efficiently have been a hot topic. The appearance of cognitive radio provides a solution of this problem. Cognitive radio, as a technology of spectrum access and spectrum sharing intelligently, consists of
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In recent years, with the rapid development of wireless sensor networks, ZigBeetechnology are widely used in the application of medical sensors, building automation,consumer electronics, industrial control and families at low complexity. The reasons for usingZigbee are showed as following: self- organization, low power, supports large number of nodes,secure, etc. At the same time, lots of
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