Wireless Network EC2043 April2014 8th Semester Question paper - Reg2008

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Question Paper Code : 51383
B.E./B.Tech, DEGREE EXAMINATION, APRIL 2014.
Eighth Semester - ElectronicS and Communication Engineering
EC 20431 / EC 608/10144 ECE 57 - WIRELESS NETWORKS
(Regulation 2008/2010)



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PART A - (10 x 2 = 20 marks)

1. Compare FDMA, TDMA and CDMA.
2. Mention some key factors that contribute to Security problems in wireless networks.
3. List out the difference between 1G and 2G systems.
4. Mention the key features of IS 95 systems.
5. What are. the functions of physical layer of IEEE 802.11 system.
6. Write the expansion.for WiMax and features of the system.
7. What are the characteristics of MANETs?
8. Define the types of Wireless Sensor Networks.
9. What is the frequency band and channel bandwidth specification of WiMax standard?
10. Mention the three error correction mechanism used by Bluetooth systems.

PART B — (5 x 16 = 80 marks)

11. (a) (i) Explain -Non–persistent,' Ipersistent and. P–persistent CSMA protocols. . . (10)
Compare the throughput performance of ALOHA, Slotted Aloha and CSMA protocols.. (6) -Or
Explain the principle, Frame structures and working of TDMA system. (8).
What is meant by hand off? Describe the different handoff mechanism... (8),

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