Department of Electronic Media: System Theory and Technology


During the last couple of years we have placed the emphasis of the research activities on the co-existence of (wireless) broadcast and broadband networks. In addition, we continue work related to the more classical broadcast systems. A number of work items in this field relate to the activities of the International DVB Consortium. Prof. Reimers chaired the DVB Technical Module (TM) for 20 years - until June 2012.

In order to enable the co-existence of broadcast and broadband, we invented three new systems. The first one is "Dynamic Broadcast". Dynamic Broadcast allocates frequency spectrum dynamically to either wireless broadband or to terrestrial broadcast networks. The second system is called "Tower Overlay over LTE-A+". Its aim is to offload popular content from cellular broadband networks by integrating broadcast infrastructures, while also reducing energy consumption and network costs. The third invention (Redundancy on Demand) extends the coverage area of terrestrial broadcast networks through the use of a broadband network. If the signal quality provided by the broadcast network is insufficient (like for instance in deep indoor environments), the broadband network is used to deliver supporting data (redundancy) in order for the broadcast receiver to display perfect image and sound.

In the research area of transmission standards for digital radio, a researcher is engaged in the local service insertion for DAB+.
Furthermore, one staff member conducts research into measurement technology for the transmission standard DOCSIS 3.1 - the latest version of a standard which allows fast Internet access via cable.
A flagship of our research is the Software Defined Radio Toolkit developed at the IfN. Its extensive software library enables the flexible implementation of modern transmission technologies.

One of our researchers concentrates on supporting households and enterprises during Germany´s departure from nuclear and fossil-fuel energy by means of communication technology.