Centralized cooperative spectrum sensing with energy detecion in cognitive radio and optimization
Samrat Chandrakant Shinde, Ajitsinh Jadhav · 2016
In this paper cognitive radio method is used for advanced wireless sensing technology. In cognitive radio, the secondary user utilizes the primary user's spectrum when primary user is not utilizing the band. The sensing of spectrum is of very importance in cognitive radio technology, as interference to the primary user is intolerable. Here in this paper we have used energy detection method for spectrum sensing. The performance of system gets degraded when factors such as fading and noise gets introduced. To further enhance the sensing capability of the system and overcome above issues, we are using centralized cooperative spectrum sensing technique. Cooperative sensing considers the neighboring cognitive radios decision in radio environment, for making final decision of availability of spectrum band. The centralized fusion center enables us to make a firm decision regarding the status of channel and broadcast the signal back to the transmitter. The number of cognitive radios to be considered for final outcome has to be kept limited. Thus we have focused on optimization of number of cognitive radio and optimum threshold required to get best results with minimum resources. The proposed system model designed based on hard decision, sends the fused decision back to the base station, where depending upon understanding between cognitive nodes and service provider assigns the vacant band to one of the needy cognitive radios.