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rfsimulator: add support to simulate a long propagation delay

Thomas Schlichter requested to merge rfsim_add_prop_delay into develop

Add the option --rfsimulator.prop_delay to specify the simulated receive-path (gNB: UL, UE: DL) propagation delay in ms. This option can be used e.g. to simulate a simple GEO satellite channel by specifying --rfsimulator.prop_delay 238.74 to both, the gNB and the UE.

This is part of the work developed by Fraunhofer IIS within the ESA-funded project 5G-GOA (

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