Ivan Dokmanić, Reza Parhizkar, Andreas Walther, Yue M. Lu, and Martin Vetterli aAudiovisual Communications Laboratory (LCAV), School of Computer and Communication Sciences, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland; andbSignals, Information, and Networks Group (SING), School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138