Abstract: In recent past the growth of wireless devices and multimedia applications has resulted in increased usage of spectrum causing spectral congestion problem. In order to access the electromagnetic spectrum in an opportunistic way Cognitive radio (CR) provides tempting solution by making best use of the frequency band which is not heavily occupied by licensed users i.e. primary user(PU), hence improving the spectrum utilization and quality of service (QoS) of a secondary user (SU). In this paper, a new hybrid spectrum sensing technique is proposed for transmitter based spectrum sensing which can reduce the computational power consumption and sensing time of frequency band. The proposed technique helps in detecting the inactive spectrum bands opportunistically with better utilization of the spectrum with increase in the overall spectrum efficiency. The Strategy is being described in the following sections. Where two parameters of comparison are taken, with which the results are formulated which are probability of detection and probability of misdetection. In both the considered parameters the Selective Variant Intelligent Spectrum Sensing (SVSS) performs better than Intelligent Spectrum sensing scheme (I3S).

Keywords: cognitive radio, spectrum hole, spectrum sensing, opportunistic spectrum access, Primary User, Secondary User.