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The main focus of this research area is the development of transmission concepts and coding schemes for communication systems. The research work concentrates on the physical layer and the data link layer (OSI layers 1 and 2). Here, state-of-the-art forward error correction schemes approach Shannon's channel capacity for point-to-point communications very closely. However, the practical implementation of these sophisticated concepts is still going on and needs further progress.

While the ultimate limits are closely reached for point-to-point communications a more or less unsolved problem is the deterination of the capacity of even small networks like relay or sensor networks. For example, relay nodes are currently discussed as a suited mean for improving the coverage in cellular mobile radio systems. Moreover, sensor networks become more and more important in many different areas like ambient assisted living or environmental protection. Although information theory is dealing with relay networks already for decades, their capacity is not known until now. The information technology team is primarily working on the optimization of relay networks for mobile communications. Coding and transmission concepts as well as information theoretical considerations are the main focus.

Moreover, a real-time hardware MIMO demonstrator is currently developed. Based on Matlab-Simulink simulations the algorithms are finally implemented on FPGA and DSP platforms. It is intended to extent the demonstrator to a relay network as well.

Future information communities rely on a high throughput between mobile participants at low costs. Electro-magnetic waves are the only known physical medium qualified for such a high throughput. Solely high frequency engineering can offer the theoretical background to solve such problems. Advances in the field of data communication using electro-magnetic waves are only possible by consideration whole systems consisting of several transmitters, transmitter antennas, radio channels, receiver antennas and receivers as one communication system. Thereby, areas such as signal processing, the theory of Maxwell, the propagation of radio waves, high frequency circuitry and digital technology have an strong influence and impact on the considered solutions. Here, MIMO and OFDM mobile communication systems belong to current research topics.

The reserach group Signal Processing and Virtual Acoustics focuses on audio signal processing, virtual acoustics and psychoacoustics in reserach and education. Novel approches for the analysis and synthesis of spatial sound fields and their evaluation are of special interest. The research topics are focussed around the analysis of sound fields by spherical microphone arrays, binaural synthesis, synthesis of sound fields (Wave Field Synthesis, Higher-Order Ambisonics), perception of synthetic sound fields and (Real-time) implementation of algorithms for the analysis and synthesis of sound fields. More information on our activities can be found on the pages of the reserach group.

The research group Image Processing deals with the development, analysis and optimization of methods and algorithms for efficient processing and compression of multimedia data (e.g. signals, images, stereo and video data (2D, 3D)).
Current research is mainly focused on multimedia signal processing (in particular energy-efficient and robust video data compression and multimedia security (watermarking of digital data for authentication, copyright protection and fingerprinting).

In the field of Hydroacoustics supported by some third party projects, there are longstanding experiences with solutions of engineering and geo-scientific problems in the field of examining of ocean bottoms (source for raw materials, construction ground, shipping, environmental protection, underwater archeology, global climate changings). Different techniques were developed and tested, also under sea conditions. Data was evaluated actively by students. Especially the development of the sedimant echo sounder SEL must be mentioned. With this device outstanding results in shallow water regions and in the deep sea were achieved (expeditions to the north sea, the baltic sea, the north and south atlantic).

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Institut für Nachrichtentechnik
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