00322    a2200121   4500020001500000082001700015100002100032245004600053250000900099260004100108300002100149650003000170  a8120308506  a621.382bROD  aRoden, Martin S.  aAnaloge and digital communication systems  a3rd   aNew DelhibPrentice hallc1991g2002  axv, 505p.c23cm.  aCOMMUNICATION ENGINEERING