DSSS - FFT plot of spread Vs despread signals

fft_plot_dsss_example_signals.py

f = signal.resample(mot, 512)

N = 512
# sample spacing
T = 1.0 / 12000.0
yf = fft(f)
xf = fftfreq(N, T)
xf = fftshift(xf)
yplot = fftshift(yf)

f1 = signal.resample(z, 512)

N = 512
# sample spacing
T = 1.0 / 12000.0
yf1 = fft(f1)
xf1 = fftfreq(N, T)
xf1 = fftshift(xf1)
yplot1 = fftshift(yf1)

fig, (ax1, ax2) = plt.subplots(2, figsize=(30,20))
# fig.suptitle('Vertically stacked subplots')
ax1.plot(xf, 1.0/N * np.abs(yplot))
ax1.set(xlabel='Frequency', ylabel='Magnitude')
ax1.set_title('Fourier transform of De-Spread/Un-Mixed wave', fontsize=20, fontweight="bold")
ax2.plot(xf1, 1.0/N * np.abs(yplot1))
ax2.set(xlabel='Frequency', ylabel='Magnitude')
ax2.set_title('Fourier transform of Spread/Mixed wave', fontsize=20, fontweight="bold")