Matlab, incomplete code for spectrum estimation ; Hamming window, plotting the density against periods rather than frequency bins

1. How to plot power spectral density in Matlab?
2. What is the Matlab command for Hamming window?
3. How do you find the periodogram in Matlab?

How to plot power spectral density in Matlab?

Estimate the one-sided power spectral density of a noisy sinusoidal signal with two frequency components. Fs = 32e3; t = 0:1/Fs:2.96; x = cos(2*pi*t*1.24e3)+ cos(2*pi*t*10e3)+ randn(size(t)); nfft = 2^nextpow2(length(x)); Pxx = abs(fft(x,nfft)).

What is the Matlab command for Hamming window?

w = hamming( L ) returns an L -point symmetric Hamming window. w = hamming( L , sflag ) returns a Hamming window using the window sampling specified by sflag .

How do you find the periodogram in Matlab?

pxx = periodogram( x ) returns the periodogram power spectral density (PSD) estimate, pxx , of the input signal, x , found using a rectangular window. When x is a vector, it is treated as a single channel.