Wireless Communication - Dec 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) Compare 1G, 2G, 3G, 4G wireless cellular networks. Also explain the characteristics of 3G with special reference to cell size, data rate and mobile speed.(12 marks) 1 (b) With a neat circuit diagram, explain a wireless telegraphic transmitter.(8 marks) 2 (a) Explain with necessary diagrams the formats of MSISDN number, IMSI number and IMEI number.(8 marks) 2 (b) With a neat diagram, explain the common cellular network components and their functions.(12 marks) 3 (a) Explain how the capacity of a cellular system can be increased by cell sectoring.(7 marks) 3 (b) Explain the frequency reuse concept used in cellular communication. Explain with mathematical expression the possible cluster size and trade off in selection of the cluster size (N-3, 7, 12).(10 marks) 3 (c) Explain NCHO, MCHO and MAHO.(3 marks) 4 (a) Explain with necessary diagrams various TDMA frames.(6 marks) 4 (b) Explain the various control channels used in GSM.(8 marks) 4 (c) List the various GSM services.(6 marks) 5 (a) Explain with neat diagrams GSM inter-MSC handover and Intra-BSC handover.(12 marks) 5 (b) What is Location Area (LA) in a cellular system? What is location updating? Explain the basic steps involved in location updating (Idle Mode).(8 marks) 6 (a) What is the meaning of registration process in CDMA systems? Explain the various forms of registration supported by CDMA systems.(7 marks) 6 (b) Explain the different types of soft and hard hand-offs supported by CDMA systems.(7 marks) 6 (c) Compare AMPS, GSM and CDMA air interfaces.(6 marks) 7 (a) Explain with mathematical equations two-ray path loss model.(7 marks) 7 (b) Explain block interleaving technique to correct burst errors.(6 marks) 7 (c) Explain how cellular system performance can be improves using space and polarization diversity schemes and smart antenna system.(7 marks) 8 (a) Explain with necessary diagrams Bluetooth Piconet and Scatternet architectures.(8 marks) 8 (b) Explain a 4×4 antenna sectoring scheme used in wireless MAN.(6 marks) 8 (c) List the features of IEEE 802.11X technologies.(6 marks)