Research questionHow can differentiable radio-wave propagation be simulated efficiently for channel impulse responses and radio maps?Radio propagation simulation must compute channel impulse responses and radio maps without making ray-tracing costs prohibitive. These outputs require different path calculations, while useful gradients must remain available for changing system and environmental parameters. Latest papersRecent research connected to this question, newest first.Sionna RT: Technical ReportThe source concerns Sionna RT, an open-source GPU-accelerated ray tracer. It covers differentiable channel impulse responses, radio maps, material properties, antenna patterns, and array geometries, using distinct algorithms for each output, including ray shooting and bouncing, the image method, duplicate-path elimination, and diffracted paths. The report also discusses current limitations.research paper · Sep 3, 2026