Wireless Communication - Jun 2014

Electronics & Communication (Semester 8)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) With an appropriate diagram, explain the OSI model. How does it relate to communication network?(10 marks) 1 (b) Describe the characteristics of 1G, 2G and 3G cellular system, How do 2G cellular system support more than one user per channel?(10 marks) 2 (a) Draw the neat block diagram of common cellular system and explain the base station system (BSS) components.(10 marks) 2 (b) With neat flow diagram, explain the mobile terminated call operation.(10 marks) 3 (a) Explain the following capacity expansion techniques:
i) Cell splitting
ii) Cell sectoring
iii) Overlaid cells(10 marks) 3 (b) Explain the power control and power saving schemes in cellular system.(10 marks) 4 (a) With a neat GSM network architecture, explain the network switching system (NSS).(10 marks) 4 (b) With suitable diagram, explain the GSM channel concept.(10 marks) 5 (a) List the different call set-up operations and with flow diagram explain interrogation phase and IMEI check operation.(10 marks) 5 (b) With neat flow diagram, explain GSM inter BSC handover operation.(10 marks) 6 (a) With a neat block diagram, explain the generation of CDMA forward traffic channel.(10 marks) 6 (b) Explain the CDMA mobile originated timeline.(10 marks) 7 (a) With neat diagram, explain 4-PSK modulation technique.(10 marks) 7 (b) Explain the following:
i) Path loss model
ii) Block interleaving(10 marks) 8 (a) What are the IEEE 802.11 extensions?(6 marks) 8 (b) With suitable diagram, explain the Bluetooth piconet architecture.(7 marks) 8 (c) With suitable diagram, explain the Bluetooth system component.(7 marks)