1. Department of Electrical Engineering and Information Technology, Technical University of Munich, Munich, Germany
2. Christian Doppler Laboratory for Digitally Assisted RF Transceivers for Future Mobile Communications, Johannes Kepler University (JKU) Linz, Linz, Austria
3. Intel, Neubiberg, Germany
4. Institute for Integrated Circuits, Johannes Kepler University (JKU) Linz, 4040 Linz, Austria