A Novel Signal Detector based on Approximated Fractional Integrator in Frequency Domain

This paper investigates weak signal detection using approximated fractional integrator (AFI). An optimal spectrum sensing scheme based on the criterion of maximization of the deflection ratio coefficient (DR) has been proposed in the frequency domain. Due to the easy availability and less time complexity of fast Fourier transform (FFT) chips in the industry, signal detection is primarily done in the frequency domain. Approximated fractional integrator transforms the data to give the maximum DR because of its non-linear low-pass characteristic. Example and simulation results have been illustrated to observe the performance and properties of the proposed detector. A precise comparison has been discussed with state-of-the-art techniques.