Since that presentation was a customer research case I doubt there are any more implementation details available.
I would simply recommend to learn how to use OptiX to implement algorithms which can be solved with ray tracing. It’s a general purpose high-level ray casting SDK.
Maybe start working through the new OptiX Introduction samples. Links here:
That series of examples implements a uni-directional path tracer and the concepts are similar to that pseudo algorithm description.
Your transmitter handling would go into the ray generation program and the receivers would be the lights. Apart from the cone around the reflection direction, the visibility tests are basically the same.
You would need to adapt whatever your output results should be and generate the proper data at the per ray payload when a path connects to a receiver and save that at the end of the ray generation program.
Though I have no idea how channel impulse responses or power delay profiles are affected by the wavefront propagation through space and especially what the material properties would need to be to simulate the reflection, transmission or diffraction behaviour through a scene. That’s your responsibility to implement.