Wireless Communications

 

The term Wireless Communications encompasses a wide set of different applications and challenges. On the one hand, high data throughput with increased spectral efficiency is targeted by cellular mobile communications, while on the other hand resource-constrained sensor networks require novel algorithms and protocols. Our research covers the full bandwidth of this spectrum.


The NiCom project (DFG) is set within the context of sensor networks. Its goal is the joint activity and data estimation of multiple sensors, by using techniques from the theory of Compressed Sensing.

The main focus of research focuses on novel detection algorithms, like augmented Sphere Decoding and other non-linear detectors for underdetermined signals, and will culminate in a hardware demonstration.
Cooperative communication is a very promising candidate to realize enhanced system performance, reliability, and coverage extension for wireless systems. Within the DFG-project “COIN”, we aim to improve the system performance in relaying networks which are using physical-layer network coding (PLNC) to exchange information between two sources via a relay. A major focus is placed on implementation aspects in the physical layer like synchronization and compensation of practical RF front end impairments. In order to confirm the theoretical investigations, a real-time testbed is implemented in the ITEM MIMO LTE demonstrator.


Data compression is one of the major tasks in information theory or signal processing. In order to save memory resources or transmission capacity, data compression techniques can be applied to reduce bits by identifying and eliminating redundancy (lossless) or unnecessary information (lossy). ITEM takes advantage of correlated input data to provide an efficient compression approach inspired by principles of Compressed Sensing and Image Inpainting. Across the different fields of activities, we implement promising algorithms for (baseband) signal processing applications. High-end multi-processor platforms as well as all necessary RF laboratory equipment are available for prototyping purposes. Selected architectures can be implemented as ASIC or ASIP circuits.