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wigig-tools / qd-realization

A quasi-deterministic (Q-D) channel implementation in MATLAB software
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Frequency dependency of material libraries #14

Open csathob opened 3 years ago

csathob commented 3 years ago

Dear Developers, As one of the satisfied users of your ray tracer, I was wondering about the validity of the NIST material library at ~39GHz. If I'm not mistaken -- and sorry if I misunderstood something --, the current library is based on measurement campaigns (both NIST and TGay) that have been carried out in the 60GHz band. Do you have any experience with the ray tracer in other bands? Thank you very much in advance!

mattia-lecci commented 3 years ago

Hi, The NIST measurement team replied us that they can vouch only for the specific frequencies and the environments they tested. Similarly, check the TGay documentation for similar constraints. Hope this can help!

neerajvarshney commented 3 years ago

Hi @csathob

We are currently supporting 60 GHz and 28 GHz material libraries only. All NIST and TGay scenarios are based on 60 GHz except parking lot which is based on 28 GHz. You cannot use the same libraries for ~39 GHz. However, if you have these material libraries, and pre and post cursors parameters [e.g. src/material_libraries/intraClusterTgayParameters.txt and src/material_libraries/materialLibraryConferenceRoom.csv] for ~39 GHz, you can easily use our raytracer with TGay QD model. Please let me know if you need more information

Best

csathob commented 3 years ago

Dear Mattia Lecci and Neeraj Varshney,

Thank you very much for your time and detailed answers! Unfortunately, I don't have material libraries for 39 GHz, which I might obtain from some source. (Recently, Matlab also provide relative permittivity and conductivity through buildingMaterialPermittivity() function) However, the pre and post cursor parameters require a particular measurement. I think, from your detailed description and the examples, I will be able to adjust the material library if the parameters are available.

I would like to ask one more question on the topic. For which step does the simulation utilize the frequency specified in the parCfgCurrent.txt? If I'm not mistaken for evaluating the delay, AoA and AoD, the frequency is irrelevant.

Thank you very much for your answer in advance! Best regards, Botond

neerajvarshney commented 3 years ago

Hi

you are right, carrier frequency is only utilized in path gain and doppler as can be found in LOSOutputGenerator.m and multipath.m

csathob commented 3 years ago

Dear Neeraj Varshney,

Thank you very much for the answer. I'll check the source code.

Best regards, Botond