Doppler spectrum using channel impulse response

[KlaussIT]

Hello,

I'm trying to determine the doppler spectrum for a specific tap, using channel impulse response.
There is how I proceed to determine the channel impulse response :
- I have real and imaginary part from ray field E
- magnitude = abs(real + imaginary)
- phase = angle(real + imaginary)
- channel impulse response = magnifique*exp(-phase)

Now, how could I determine sur doppler spectrum thanks to the channel impulse response. Power delay profile = (channel impulse response)²

Best regards.