Performance Study between Two-Stage Detectors and Estimated SNR Based Detector in Cognitive Radio Networks

In this paper, we present a performance study between two-stage detectors and propose estimated signal to noise ratio (SNR) based detector. The propose sensing technique consists two detectors, energy detector (ED) & ED with ADT detector, out of these two detectors only one will perform sensing operation at a time. Selection of detector depends on condition between estimated SNR value (S_e) and threshold (γ). Numerical results show that proposed ESNR ADT scheme outperforms the cyclostationary based sensing method by 30.5 % at -10 dB signal to noise ratio (SNR). It is also shown that the proposed scheme has lesser sensing time than cyclostationary detection in the order of 5.2 ms at -20 dB SNR.