Project M02 - Multidimensional Multiscale Simulations for Sub-mm-Wave Radio Systems


Principal Investigator: Prof. Dr. Ilona Rolfes, RUB HFS

Up to now, the frequency range from 250 GHz to 1.5 THz, which is addressed during the first phase of MARIE, has been rather unexplored. Even though it is well known that molecular absorption lines influence the free-space propagation of electromagnetic waves in this frequency band, further propagation mechanisms such as scattering phenomena are not completely investigated and understood yet. Due to the short wavelength, simplifying approximations that are commonly used in conventional channel models below 100 GHz cannot be applied to these frequencies.

Therefore, this project aims at taking multiple scales of the propagation channel separately into account in order to accurately describe the dominating propagation mechanics. These mainly include directional reflections and transmissions, diffuse scattering, and frequency dependent absorption. A holistic propagation model is achieved by applying different simulation methods to the multiple scales of the electromagnetic problem: full 3D simulation of antennas, appropriate descriptions for free space propagation (e.g. frequency dependent ray tracing) and accurate simulations for wave-object interactions such as reflection, refraction or diffuse scattering that depend on material properties (e.g. surface roughness, permittivity).

In addition to modelling the complex physical propagation effects, it is intended to build up a simulation infrastructure that allows the different simulation scales to be done in parallel. This targets a multidimensional simulation using coupled solvers on multiple scales. This can drastically reduce the total computation time, making a simulation of MARIE (sub-) systems affordable in terms of required time.

A detailed system-level validation is achieved through close cooperation with other projects. By making use of the THz channel measurement system in M01, the simulator performance can be evaluated in realistic propagation scenarios. There is also a strong link to M03, since electromagnetic signatures of objects with complex (i.e. rough) surfaces are a valuable input to the simulation of wave object interactions and can further improve the simulations’ total accuracy.

Eventually, a holistic simulation environment based on coupled simulators in the considered frequency range will be available for all partners within MARIE and can be used for identifying performance requirements of developed devices (C01, C03, C05, C08) and also for testing algorithms and signal processing principles in realistic scenarios (S01, S02, S03).