PSD Computation using modified Welch algorithm

Power Spectral Density (PSD) shows strength of energy as a function of frequency. PSD computation can be done by the method called FFT. Welch algorithm is used to calculate Power Spectral Density. High computational complexity is the main drawback of Welch method. By using 50% overlap we are reducing the computational complexity of Welch method. Here N/2 point FFT is computed instead of N-point FFT and we are using Windowing in frequency domain for high performance. In this approach even samples are computed exactly but odd samples required half sample delay shift. So, overlap method reduces the computational complexity as half of the normal method. To reduce area, pipeline stage is introduced instead of parallel structure.