ICDT 2012 The Seventh International Conference on Digital Telecommunications ISBN: 978-1-61208-193-9 April 29 - May 4, 2012 Chamonix / Mont Blanc, France ICDT 2012 Editors Eugen Borcoci, Politehnica University of Bucharest, Romania Petre Dini, Concordia University, Canada // China Space Agency Center, China 1 / 144