A Reliable Adaptive Multitaper Spectral Detector in Wideband Strong Interference Environments

Dramatic increase in demand for spectrum access opportunities has triggered a deficiency of conventional single frequency band sensing. Moreover, methods needing large amounts of observations are also inefficient. This has motivated the proposition of an adaptive multitaper spectral detector (AMTSD) for wideband sensing based on Locally Most Powerful Test (LMPT). By taking advantage of multitaper gains, the proposed detector provides a higher degree of freedom (DoF) for the improvement of detection performance. Besides, the detector performs two phase sensing with adjustable spectral-resolution. This makes the system robust to strong interference environments and compatible with wideband spectrum sensing applications. Numerical simulations show that the proposed detector outperforms the cooperative autocorrelation-based and energy detectors in single band sensing by more than 30% in detection performance under SNR=0 dB and P_{FA}=10^{-3}. Moreover, by the provided detector, weak PU (-5 dB) detection can be achieved with multitaper gains even with adjacent strong interference (30 dB).