Doppler Effect

Antonio Fiore

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Apr 30, 2021, 6:25:51 AM4/30/21

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Hi everyone!

I've been using OMNeT++ for a few months to simulate a kind of satellite link for my Master Degree thesis, but up to now I haven't been able to figure out wheter the INET framework, on its own, takes into account the Doppler effect/shift while a host is moving, because I can't find it neither in the mobility modules nor in the modules which deal with the path loss models and propagation models.

Could you kindly help me find the answer, please?

Thanks for your attention.

Best regards,

Antonio Fiore

Levente Mészáros

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Apr 30, 2021, 6:30:20 AM4/30/21

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No, by default it does not.

Although you could give a reasonable approximation by changing the dimensional analog model by taking into account the transmitter/receiver speeds.

Regards,

levy

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Antonio Fiore

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Apr 30, 2021, 11:24:12 AM4/30/21

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Hi!

Thanks a lot for your reply.

I can try the solution you proposed, but the dimensional radio model does not use techniques such as Forward Error Correction, interleaving or spreading and I need at least the FEC for my purposes. Sorry, I should have said it right away.

Therefore, I am trying the SimuLTE framework, instead, which I have read that includes both FEC and the Doppler Effect, by using the realistic LTE channel.

Unfortunately, I can't figure out how to make 2 hosts in D2D communication reach each other at a distance of more than 5000 m. Moreover, they still seem to be dependent on the eNodeB, although the type of communication is D2D. I think I am missing something important.

Any hints?

Levente Mészáros

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Apr 30, 2021, 2:36:27 PM4/30/21

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I don't know much about simuLTE but the dimensional analog model has nothing to do with it FEC, interleaving or spreading. It's just a way of specifying the power spectral density of the signal. The FEC, etc. is just meta data that is taken into account by the error model. The actual computation is not done in a packet level stimulation.

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Antonio Fiore

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May 3, 2021, 6:03:11 AM5/3/21

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Hi!

Thanks for the elucidation, I really appreciate your help, I had read it on the documentation at the web address "https://doc.omnetpp.org/inet/api-current/neddoc/inet.physicallayer.apskradio.packetlevel.ApskDimensionalRadioMedium.html", that's why I thought so.

However, if I can get the SimuLTE work at a distance higher than 5000 m, it would be better than implement the Doppler Effect by modifying the default dimensional analog model, right now, because I only know some theoretical formulas of the Doppler Effect, I haven't figured out how to have it by modifying that model, and I have seen that, in SimuLTE, they also take into account the phase shift. Therefore, it seems to be well implemented.