Distributed indoor spectrum occupancy measurements in the UHF TV band

In this paper we present spectrum usage results from a measurement campaign conducted in Berlin (Germany) during the International Radio Exhibition in September 2013. The measurements were performed in order to understand the characteristics of spectrum usage in the UHF TV band within a large indoor area. The measurement campaign relies on a spectrum sensing grid which is installed across multiple halls on the fairground at the Messe Berlin. We present our measurement setup and report our main findings regarding duty cycles and spatial correlation. Additionally, we focus on the analysis of possible coexistence threats for professional wireless microphone systems.