TY  - BOOK
AU  - COUCH LEON W.
TI  - DIGITAL AND ANALOUG COMMUNICATION SYSTEMS, 3rd ed / 
U1  - 621.380413 
PY  - 1990///
CY  - [S.N] : 
PB  - MACMILLAN PUBLISHING COMPANY ، 
KW  - DIGITAL COMMUNICATIONS
KW  - TELECOMMUNICATION - SYSTEMS
ER  -