TY  - BOOK
AU  - Hsu, Hwei 
TI  - Anolog and digital communications: schaum's out lines 
SN  - 0-07-058611-X 
U1  - 621.382 2 HSU  
PY  - 2004///
CY  - Tata mcgraw hill 
PB  - New Delhi 
KW  - COMMUNICATION SYSTEM
ER  -