Which parameters are useful to determine for an Ultranarrowband system with static RX and TX but dynamic environment ?
Power delay profile, Doppler spectral density, RMS delay spread, coherence bandwidth, Mean delay, Mean doppler shift,RMS doppler spread ?
Interesting question, you cited all the main channel parameters in your question.
A narrowband system does not exced the coherence bandwidth, which is related to the inverse of the delay spread, for this reason I do not consider these parameters in this kind of channels. I would focus the study on the doppler spread characterization instead of the delay spread, which is related to the coherence time of the channel. Apart from that, the doppler shift information has to taken into account to describe the phase rotation provided by the channel.
Looking forward to hearing from your comments
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