Research On Spectrum Sensing Technique For Cognitive Radio

Cognitive radio technology can alleviate the spectrum allocation effectively and the utilization of the conflict between the increasing tensions with the spectrum resources. Cognitive radio technology is the hot spots in the field of wireless communication.In cognitive radio technology, how to master spectrum sensing technology accurately and fast is the most important task for the application of cognitive radio, which is the basis and premise of the radio application. It is one of the key cognitive radio technologies, which determined the other aspects of its implementation.In this paper, I introduce the background of the cognitive radio technology and the development of spectrum detection technology, which laid a theoretical foundation for the following research. Second, I introduced energy detection technology, which is one of the spectrum detection technology. I found spectrum problems through theoretical analysis and simulation.Third, perceived as a result of the spectrum for the above methods, the perceptual threshold is more difficult to determine. I proposed adaptive threshold sensing methods, through the theoretical and simulation analysis to prove the superiority of the method. At the same time, for the short comings of the spectrum cooperation and detection, I proposed a new spectrum sensing program. Although the method was greatly enhanced detection performance, but it very complicated. For the shortcomings of the program, I also raised the amount of 2bit combination of hardware program, which can achieve the balance of the complexity and detection performance; Finally, I analyzed the method of reduced threshold under the condition of the N-channel signal to noise ratio.