Energy Aware Architecture Using Spectrum Sensing Technique in Cognitive Radio Network
Journal Title: International Journal of Advanced Research in Computer Engineering & Technology(IJARCET) - Year 2012, Vol 1, Issue 7
Abstract
Cognitive radio (CR) is a novel concept that allows wireless systems to sense the environment, adapt, and learn from previous experience to improve the communication quality. The signal is detected by comparing the output of the energy detector with a threshold which depends on the noise floor. Spectrum sensing on reallocation is a concept of detecting the usage of carrier signal by different nodes and allowing the free spectrum to be used by nodes other than the principle of spectrum holder node. In this paper we Defines overall spectrum (range of frequency for the communication). Then space is divided into spectrum of equal span for example, if the communication basic spectrum is between 1Hz to 100Hz and there is a provision for 20 users than the spectrum ranges will be 1-5, 1-6, and so on. Each node transmits at its allocated spectrum using frequency modulation. Sensor takes the FFTs of channel and determines the pick. Each pick represent used spectrums then subtract used spectrum from total spectrum to get the free spectrum. After getting free spectrum we allocate one of the free spectrum to existing communicating node so that node can completes communication fast. At the end again free the spectrum so the reallocation problem is determined by the energy consumption at the node. If the noise level is uncertain, energy detection will eventually become difficult below a certain SNR level.
Authors and Affiliations
R Pavankumar, , Prof Santoshkumar Bandak,
Keywords
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