We investigate and design accurate radio signal predictions tools using ray-tracing and propagation graphs. These prediction methods allow for advanced indoor localization solutions in a GPS denied environments (tunnels, office buildings, shopping malls). The AIT has know-how for beacon based Bluetooth low energy hardware infrastructures, as well as ultra-wideband and multi-antenna systems for high accuracy applications. We offer an advanced wave propagation computation engine based on geometrical building data that can be customized for various application scenarios.