MIMO Transmitters with Single Power Amplifier

Abstract:
Future wireless access points are expected to be equipped with a massive number of antenna elements. This makes the costs of analog hardware to become an important factor in the design of wireless transmitters. This presentation gives an overview over the possibilities to implement a true multiple-input multiple-output (MIMO) system with only a single power amplifier that even can be fed with constant envelope. Various possible implementations are discussed. These include parasitic elements, star-point and out-phasing architectures, and reflect arrays. Furthermore, signal processing designed to reduce the adverse effects of some of these implementations are presented. Finally, phase shift keying on the hypersphere, a modulation scheme particularly suited for single amplifier MIMO transmitters, is proposed.

Biography:
Prof. Müller was born in Schwabach, Germany, 1970. He received the Dipl.-Ing. and Dr.-Ing. degree with distinction from the Friedrich-Alexander-University (FAU) Erlangen-Nuremberg in 1996 and 1999, respectively. From 2000 to 2004, he directed a research group at Vienna Telecommunications Research Center in Vienna, Austria and taught as an adjunct professor at Vienna University of Technology. In 2005, he was appointment full professor at the Department of Electronics and Telecommunications at the Norwegian University of Science and Technology in Trondheim, Norway. In 2013, he joined the Institute for Digital Communications at FAU Erlangen-Nuremberg in Erlangen, Germany.He held visiting appointments at Princeton University, US, Institute Eurecom, France, University of Melbourne, Australia, University of Oulu, Finland, National University of Singapore, Babes-Bolyai University, Cluj-Napoca, Romania, Kyoto University, Japan, FAU Erlangen-Nuremberg, Germany, and Munich University of Technology. 

Prof. Müller received the Leonard G. Abraham Prize (jointly with Sergio Verdú) for the paper "Design and analysis of low-complexity interference mitigation on vector channels'' from the IEEE Communications Society. He was presented awards for his dissertation "Power and bandwidth efficiency of multiuser systems with random spreading'' by the Vodafone Foundation for Mobile Communications and the German Information Technology Society (ITG). Moreover, he received the ITG award for the paper "A random matrix model for communication via antenna arrays,'' as well as the Philipp-Reis Award (jointly with Robert Fischer). Prof. Müller served as an associate editor for the IEEE Transactions on Information Theory from 2003 to 2006.