00338nam a22001217a 4500020001800000040000900018082001700027100002200044245004400066250001600110260004600126650004400172  a9788131725436  cNust  a621.382bCOU  aLeon W. Couch, II  aDigital and Analog Communication System  a7th Edition  aNew Delhi:bPearson Education Inc,c2009.  aDigital and Analog Communication System