Analog & digital Sharma, Sanjay creator New Delhi S.K. Kataria 2007 4th rev. & enl. ed 972 p 24 cm (pbk) by Sanjay Sharma include appendix & model question paper this is 4th revised & enlarged edition in 2007 Communication systems 621.382 8188458201 RP-L-218 / UBH-07-08:2 / RP-07-08:ENG