[1] Univ Politecn Valencia, Dept Comunicac, Valencia, Spain
[2] European Space Agcy, Noordwijk, Netherlands
[3] Polytech Univ, Brooklyn, NY USA
[4] New Jersey Inst Technol, Newark, NJ 07102 USA
[5] European Space Agcy, RF Syst Div, European Space Res & Technol Ctr ESTEC, Noordwijk, Netherlands