Forschungsthemen im Bereich Mobilfunk

Adaptive MIMO communication systems
In future mobile communication systems, the valuable resource of bandwidth has to be used more efficiently than today. Therefore, it is necessary to adapt transmission techniques to the propagation conditions in a better way. For conventional radio communication systems, the temporal and spatial properties of the radio channel lead to degradations because of time dispersion and fading effects.

Time dispersion causes intersymbol interference which is avoided by multicarrier transmission. The effects of fading are reduced by adaptive transmission techniques as well as multi-antenna concepts (MIMO, multiple-input multiple-output).
Adaptive multicarrier transmission
In the last years, Orthogonal Frequency Division Multiplexing (OFDM) has become the dominant transmission technique for both wired and wireless communication systems. Besides its advantages to combat multipath propagation with simple receiver structures, it furthermore enables a flexible adaption of modulation schemes on a subcarrier basis or group of subcarriers.
Filter bank multicarrier transmission systems
In the last years, Orthogonal Frequency Division Multiplexing (OFDM) has become the dominant transmission technique for both wired and wireless communication systems. Besides its advantages to combat multipath propagation with simple receiver structures, it furthermore enables a flexible adaption of modulation schemes on a subcarrier basis or group of subcarriers.
Smart antennas
In the last years, Orthogonal Frequency Division Multiplexing (OFDM) has become the dominant transmission technique for both wired and wireless communication systems. Besides its advantages to combat multipath propagation with simple receiver structures, it furthermore enables a flexible adaption of modulation schemes on a subcarrier basis or group of subcarriers.