Published Paper Details:

Spectrum scarcity is an major issue in latest wireless technologies used now a days. Literature shows 70% of spectrum is either underutilized or not utilized at all. The main process in determination of spectrum scarcity starts with Spectrum sensing in cognitive radio. Sensing through one Secondary Users (SU) node faces various issues (like hidden node, shadowing problem etc) which occurs due to channel impediments, or obstacles like buildings etc to overcome such problems cooperation based spectrum sensing is brought into existence. Although collaboration between multiple SU’s improves the sensing performance, but cooperation between nodes is itself an challenging issue. Concept of Look up Table (LUT) is widely as well as efficiently used in this paper to improve the efficiency of the system while doing cooperative sensing. Lookup Table will hold the status of the spectrum which is updated every time by multi node/Cooperative sensing process which makes sensing reliable, fast and robust. In this paper we are introducing an LUT based cooperative sensing method to improve transmission time and hence improve throughput of Cognitive radios system. We have achieved Probability of detection (PD) significantly improved by 8%, Probability of False alarm(Pfa) significantly decreased by 18% and achievable normalized throughput improved by 5% along with significant improvement in end to end delay with respect to traditional sensing method.