Mobile networks are subject to a very conflicting demand: Data rates double each year while spectrum is limited. Increasing the spectral efficiency remains the most important wireless design criterion, beside energy efficiency, optimized coverage, limited cost and others. Adaptive and cooperative algorithms exploiting the spatial domain are major tools therefore.

In this group, we investigate broadband wireless channels with multiple inputs and multiple outputs (MIMO), explore the achievable data rates in real application scenarios and develop them closer towards efficient system solutions. Our main target is to come close to information-theoretic limits in wireless networks. Therefore we develop, evaluate and improve practical algorithms including the compensation of impairment effects such as imperfect hardware, mobility and interference. Essential features of new concepts are implemented in experimental systems and tested in realistic scenarios. For instance, our group operates the Berlin LTE-Advanced test-bed.

We provide suppliers and operators of mobile networks with practically approved innovative system concepts and support standardization and development of new products in this way. Moreover, we built bridges between spectrally efficient transmission and related technologies such as wireless backhauling and explore new applications, such as efficient communication over satellites and deep drill strings.