00329    a2200109   4500020001500000082001700015100002000032245006200052260005200114300002200166650003100188  a8120312791  a621.382bCOU  aCouch,  Leon W.  aModern communication systemsbprinciples and applications  aNew  DelhibPrentice- Hall of Indiac1995g1998  axxv, 598p.c23cm.  aCOMMUNICATIONS ENGINEERING