Trade-off between AND and OR Detection method for Cooperative Sensing in Cognitive Radio

Abstract

Cognitive Radio (CR) emerging approach which solves issues like spectrum scarcity and underutilization is resolved putting into effect the innovative ideas. FCC has announced a very interesting report in 2002, pointing out that more than 70% of the Radio Spectrums are underutilized at certain times or geographic positions, which proves that spectrum scarcity is not due to fundamental lack of spectrum instead because of waste of static spectrum allocation. In Non-Cooperative sensing has a very major limitation when a user experiences shadowing or fading effects under such situations, user cannot distinguish between an unused band and a deep fade. Collaborative spectrum sensing can be used to combat such effects. This paper deals with Cooperative Sensing using AND and OR Detection method and Trade-off point is calculated using simulation on precisely built Cognitive Radio MATLAB environment. Performance analysis using ROC curves taking into consideration the Probability of False alarm (Pfa) and Probability of Missed detection (Pmd) is done. This MATLAB Simulation analysis shows and intimate that in conditions where quick response is of great importance OR detection method leads with compromise over accuracy i.e more false alarms whereas AND detection method improve significantly the overall Cognitive system performance, bumping-off issues like Pfa in OR Detection method on the expense of delayed response. Best point is simulated out having acceptable accuracy and low latency period.