[1] Ecole Nationale Supérieure des Télécommunications,
[2] 46 rue Barrault,undefined
[3] F-75634 Paris cédex 13,undefined
[4] France (e-mail: cohen@inf.enst.fr),undefined
[5] Department of Electrical Engineering-Systems,undefined
[6] Tel-Aviv University,undefined
[7] Ramat-Aviv,undefined
[8] 69978,undefined
[9] Israel (e-mail: litsyn@eng.tau.ac.il),undefined
[10] Centre National de la Recherche Scientifique,undefined
[11] Ecole Nationale Supérieure des Télécommunications,undefined
[12] 46 rue Barrault,undefined
[13] F-75634 Paris cédex 13,undefined
[14] France (e-mail: lobstein@inf.enst.fr),undefined
[15] School of Computer and Information Science,undefined
[16] 2-120 Center for Science and Technology,undefined
[17] Syracuse,undefined
[18] NY 13244-4100,undefined
[19] USA (e-mail: hmattson@syr.edu),undefined