Re: Numerically Computing Impulse Response from Power Frequency Response

On Mar 30, 10:57 am, "sushe...@xxxxxxxxx" <sushe...@xxxxxxxxx> wrote:
I am trying to compute the impulse response of a given channel to
include in a BER analysis. I have the power transfer function of the
channel, not the classical amplitude/phase transfer function of the
channel. Fortunately, the transfer function is symmetric, so I can
numerically calculate the impulse response as:

amp_freq_resp = sqrt(power_freq_resp);
imp_resp = ifft(amp_freq_resp);
imp_resp = real(imp_resp);

Is the above actually correct? If you don't have
phase information, then in general you can't get the
impulse response from the power spectral density
alone. I don't see how the symmetry helps in this
case. Can you explain, please?

Julius

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