How do I extract the coherence time and Doppler spread from S21 measurements?

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AR Reddy

+fm or -fm will be shown in the magnitude of S21. From +fm to -fm is the Doppler spread.

Hamza Nachouane

I recommend to you this article, it will help you to obtain the Doppler Spectrum by measured S21

"Doppler Spread Spectrum of a Circularly Moving Receiver in an Anechoic and a Reverberation Chamber" Progress In Electromagnetics Research C, Vol. 48, p. 125-132, 2014

Vikesh Shivik

many thanks