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%128 samples:
x = 1:1e6;
Fs = length(psdn)/128;
psdnf = psdn(1:length(psdn)/128:end);
x128 = linspace(x(1), x(end), 128); %im trying to divide the data into 128 points only
% Pxx = abs(fft(psdn)).^2/length(psdn)/Fs;
figure (1)
plot(x128,psdnf);
grid on
xlabel ('Frequency in Hz')
ylabel ('Power Spectral Density in dbm/kHz')
title ('Background Noise')
figure(2)
periodogram(psdn)
