00334nam a2200133 a 450000500170000002000150001708200170003210000210004924500380007025000120010826000350012030000250015570000200018020251203110731.0  a8178086107  a621.382bPRO  aProakis, John G.  aCommunication Systems Engineering  a2nd ed.  aDelhibPearson Educationc2002  axiv, 801p.c24 cm PB  aSalehi, Masound