1. Institute for Signal and Information Processing (ISI), D-ITET, ETH Zürich, Zürich, Switzerland
2. School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel
3. Department of Electrical Engineering, Eindhoven University of Technology, and with Philips Research, Eindhoven, The Netherlands
4. Faculty of Mathematics and Computer Science, Weizmann Institute of Science, Rehovot, Israel