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FPGA Implementation of Nonparametric Power Spectrum Estimation Methods

Power spectrum estimation is an important area in signal processing with wide range of application. Different methods developed to estimate power spectrum can be categorized as parametric and nonparametric methods. Parametric methods based on parametric models of a time series are computationally complex. Nonparametric methods are based on the Fourier transform. Due to the development of the computationally efficient Fast Fourier Transform (FFT) algorithm, nonparametric methods are preferred over the parametric methods for spectral estimation. In this paper, hardware implementation of nonparametric methods on FPGA platform has been discussed. Implementation has been carried out on Virtex5 based xc5vlx50 FPGA device using Xilinx software and VHDL language. This study would help in choosing the appropriate nonparametric method for the required application by considering the spectral resolution and variance of the spectral estimate along with the processing time and hardware resource utilization of the method.