Mobile Communication - May 2014

Electronics & Telecomm. (Semester 7)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Explain umbrella cell concept in cellular system.(5 marks) 1 (b) Explain GSM services and features(5 marks) 1 (c) What are the factors influencing small scale fading.(5 marks) 1 (d) Disuss about non-linear effects in CDMA(5 marks) 2 (a) Explain how does 60^o and 120^o sectoring improves signal to interference ratio(10 marks) 2 (b) Explain diversity methods used in cellular system(10 marks) 3 (a) Explain signal processing in GSM. What is use of interleaver?(10 marks) 3 (b) Explain frame structure used in GSM. (10 marks) 4 (a) Explain traffic channel, control channel, broadcast channel and common control channel in GSM(10 marks) 4 (b) Give a complete functional account on NSS(10 marks) 5 (a) Describe open loop and close loop system of power control in CDMA(10 marks) 5 (b) With neat diagram explain reverse CDMA channel(10 marks) 6 (a) Elaborate on forward w-CDMA channel.(10 marks) 6 (b) Explain the major 3G RTT proposal(10 marks)

Short notes (any two) :-

7 (a) Rake receiver(10 marks) 7 (b) GPRS technology(10 marks) 7 (c) IMT 2000 Concept.(10 marks)