Ray Tracing implementation for indoor scenario

Hello All,

I wonder if one could get back to me .

I want to implement the ray tracing concept for indoor wireless scenario. But clueless that how to initiate. I want to transmit signal to Receiver with some reflectors and diffraction due to roughness on walls. How to implement the ray tracing concepts? I need to check the power and delay profile for the same.

Any hint or detailed help is appreciated.

Thank you,

[Wei Joann]

Hello Ranjan,

Have you found any solution to your question?

I'm curious about that because currently I am working on a similar simulation based on matlab. I've tried using wireless insite but it failed to meet the requirement because although it can provide a simulation scenario but it can not provide the change of receiver's signal with time.

Any reply will be appreciated.

Thanks

Answer 1

[Greg]

Hi Ranjan and Wei, Recent MATLAB releases provide built-in ray tracing for indoor wireless scenarios. Define the room as an STL or glTF scene, create Cartesian transmitter and receiver sites, and use the shooting-and-bouncing-rays model:

siteviewer(SceneModel="room.stl");

fc = 5.8e9;
tx = txsite("cartesian", ...
    AntennaPosition=[-1.5; -1.5; 2.1], TransmitterFrequency=fc);

rx = rxsite("cartesian", AntennaPosition=[0.3; 0.3; 0.85]);

show(tx,ShowAntennaHeight=false)
show(rx,ShowAntennaHeight=false)

pm = propagationModel("raytracing", CoordinateSystem="cartesian", Method="sbr", MaxNumReflections=2, ... 
    MaxNumDiffractions=1, SurfaceMaterial="concrete");
    
rays = raytrace(tx,rx,pm);
rays = rays{1,1};
plot(rays)

The propagation delay and path loss of each ray can then be obtained with:

delay = [rays.PropagationDistance] / physconst("lightspeed");
pathLoss = [rays.PathLoss];

To build and visualize a channel power-delay profile:

rtChan = comm.RayTracingChannel(rays,tx,rx);
showProfile(rtChan)

The current model supports line-of-sight paths, surface reflections, and edge diffraction. It does not currently model diffuse scattering caused by rough walls, refraction, or corner/vertex diffraction.

Useful MathWorks examples:

• Indoor MIMO-OFDM Communication Link Using Ray Tracing https://www.mathworks.com/help/comm/ug/indoor-mimo-ofdm-communication-link-using-ray-tracing.html
• Ray Tracing for Wireless Communications https://www.mathworks.com/help/comm/ug/ray-tracing-for-wireless-communications.html
• raytrace documentation: https://www.mathworks.com/help/comm/ref/txsite.raytrace.html