Spectrum sensing performance in cognitive radio system

Prior to access license channel, secondary user (SU) is supposed to sense available channel to confirm that channel spectrum is unoccupied by primary user (PU) in cognitive radio (CR). Secondary user necessarily performs spectrum sensing at a certain time. Longer time allocation for spectrum sensing is expected can increase the fidelity of sensing outcome that leads to improve detection performance in term of probability of detection. This paper studies the impact of sensing time to the detection performance in cognitive radio system. This work evaluates detection performance related to sensing time. Probability of detection (Pd) and probability of false alarm (Pf) are used as metric for performance evaluation. The derived results show that sensing time has a significant impact to the detection performance. More time allocation slot for spectrum sensing is possible to improve detection performance and directly decreases false detection.