Mobile Communication - Dec 2013

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) Discuss non-linear effects in FDMA(5 marks) 1 (b) Explain cell dragging and dwell time(5 marks) 1 (c) Explain handoff strategies for 1G to 3G cellular system(5 marks) 1 (d) Discuss about frequency reuse used in cellular system. (5 marks) 2 (a) Explain GSM protocol architecture in detail(10 marks) 2 (b) Explain signal processing in GSM (10 marks) 3 (a) Explain block called delayed and block call cleared system(10 marks) 3 (b) Discuss different methods used for improvement of cellular capacity with suitable diagram.(10 marks) 4 (a) With suitable diagram explain role of Rake Receiver(10 marks) 4 (b) A transmitter which radiates a carrier frequency of 1850 MHz for a vehicle moving 60 mph, calculate the received carrier frequency if the mobile is moving :-
(a) Directly toward the transmitter
(b) Directly away from the transmitter
(c) In the direction which is prependicular to the direction of arrival of the transmitted signal(10 marks) 5 (a) Compare SDMA, TDMA, CDMA and FDMA system(10 marks) 5 (b) Explain frequency and channel specification of IS-95(10 marks) 6 (a) Explain hadoff in 3G system(10 marks) 6 (b) Elaborate on forward w-CDMA channel.(10 marks)

Write short notes any two :-

7 (a) 3G CDMA evolutionary path.(10 marks) 7 (b) Security and authentication in GSM(10 marks) 7 (c) Discuss GPRS technology.(10 marks)