TY  - BOOK
AU  - Hsu, Hwei 
TI  - Anolog and digital communications: schaum's out lines 
SN  - 0-07-122997-3 
U1  - 621.382 HSU  
PY  - 2003///
CY  - Mc graw hill 
PB  - New York 
KW  - COMMUNICATION SYSTEM
ER  -