Eertmans, J., Vittuci, E. M., Degli Esposti, V., Jacques, L., & Oestges, C. (2024). Comparing Differentiable and Dynamic Ray Tracing: Introducing the Multipath Lifetime Map. Paper Submitted to EuCAP 2025 - 19th European Conference on Antennas and Propagation.
This paper presents a comparative analysis of Dynamic Ray Tracing (DynRT) and Differentiable Ray Tracing (DiffRT) for modeling radio propagation in dynamic environments, aiming to clarify their differences, advantages, and limitations. Additionally, the paper introduces a novel simulation-based metric, the Multipath Lifetime Map (MLM), to evaluate the spatial and temporal coherence of radio channels based on environmental geometry.
The authors provide a qualitative comparison of DynRT and DiffRT, highlighting their conceptual differences, implementation aspects, and practical implications. They use two state-of-the-art tools as examples: 3DSCAT (DynRT) and Sionna (DiffRT). The MLM is introduced as a visual tool and is accompanied by two metrics: the area covered by each multipath cell and the average minimal inter-cell distance. These metrics are then evaluated in a classic urban street canyon scenario.
The choice between DynRT and DiffRT depends on the specific application and the trade-off between automation, interpretability, and computational efficiency. The MLM offers a valuable tool for evaluating the scope of DynRT applicability and understanding the behavior of multipath structures in dynamic scenarios.
This research contributes to a better understanding of advanced ray tracing techniques for radio propagation modeling in dynamic environments, which is crucial for the development of future wireless communication systems, particularly in the context of emerging technologies like V2V communication.
The study primarily focuses on a qualitative comparison and a specific urban scenario. Future research could involve quantitative comparisons, larger and more diverse scenarios, and the inclusion of additional dynamic objects beyond moving receivers.
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