Power spectral density or meansquare spectrum estimate using periodogram method
DSP System Toolbox / Estimation / Power Spectrum Estimation
The Periodogram block estimates the power spectral density (PSD) or meansquare spectrum (MSS) of the input. The block uses the periodogram method and Welch's averaged, modified periodogram method. The block averages the squared magnitude of the FFT function computed over windowed sections of the input. It then normalizes the spectral average by the square of the sum of the window samples. For more information, see Periodogram and Welch's Method.
Data Types 

Multidimensional Signals 

VariableSize Signals 

[1] FFTW (
http://www.fftw.org
)
[2] Frigo, M. and S. G. Johnson, “FFTW: An Adaptive Software Architecture for the FFT,” Proceedings of the International Conference on Acoustics, Speech, and Signal Processing , Vol. 3, 1998, pp. 13811384.
[3] Oppenheim, A. V. and R. W. Schafer. DiscreteTime Signal Processing . Englewood Cliffs, NJ: Prentice Hall, 1989.
[4] Orfanidis, S. J. Introduction to Signal Processing . Englewood Cliffs, NJ: PrenticeHall, 1995.
[5] Proakis, J. and D. Manolakis. Digital Signal Processing. 3rd ed. Englewood Cliffs, NJ: PrenticeHall, 1996.