Publications

We present a novel method for efficient computation of complex channel characteristics due to multipath effects in urban microcell environments. Significant speedups are obtained compared to state-of-the-art ray-tracing algorithms by tracing continuous beams and by using parallelization techniques. We optimize simulation parameters using on-site measurements from real world networks. We formulate the adaption of model parameters as a constrained least-squares problem where each row of the matrix corresponds to one measurement location, and where the columns are formed by the beams that reach the respective location.

This paper presents a sketch-based interface for interactive modification of architectural design prototypes inside a virtual environment. The user can move around in the scenery and create line drawings to add annotations. In order to modify or extend the scenery, she can sketch command symbols, which are then recognized by the application to trigger the application defined commands. This allows the user to modify existing objects in the scene as well as to create new ones. This sketch based interface is supposed to act as a front-end application for architects in order to have a tool for the interactive reconfiguration of rooms and interior in a visual-acoustic virtual environment.