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Energy Aware Architecture Using Spectrum Sensing Technique in Cognitive Radio Network

Author(s): R Pavankumar, Prof. Santoshkumar Bandak

Journal: International Journal of Advanced Research in Computer Engineering & Technology (IJARCET)
ISSN 2278-1323

Volume: 1;
Issue: 7;
Start page: 270;
Date: 2012;
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Keywords: cognitive radio network | spectrum sensing | energy detection sensing | simulation result.

Cognitive radio (CR) is a novel concept thatallows wireless systems to sense the environment, adapt, andlearn from previous experience to improve the communicationquality. The signal is detected by comparing the output of theenergy detector with a threshold which depends on the noisefloor. Spectrum sensing on reallocation is a concept of detectingthe usage of carrier signal by different nodes and allowing thefree spectrum to be used by nodes other than the principle ofspectrum holder node.In this paper we Defines overall spectrum (range offrequency for the communication). Then space is divided intospectrum of equal span for example, if the communication basicspectrum is between 1Hz to 100Hz and there is a provision for20 users than the spectrum ranges will be 1-5, 1-6, and so on.Each node transmits at its allocated spectrum using frequencymodulation. Sensor takes the FFTs of channel and determinesthe pick. Each pick represent used spectrums then subtractused spectrum from total spectrum to get the free spectrum.After getting free spectrum we allocate one of the free spectrumto existing communicating node so that node can completescommunication fast. At the end again free the spectrum so thereallocation problem is determined by the energy consumptionat the node. If the noise level is uncertain, energy detection willeventually become difficult below a certain SNR level.
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