Wireless Technology - Dec 2015

Information Technology (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) Consider a single high-power transmitter that can support 100 voice channels covering a given service area. Let the service area be divided into seven smaller area/cells. As shown in figure, each supported by lower power transmitters. The available spectrum of 100 voice channels is divided into 4 groups of 25 Channels each. The cells (1, 7) (2, 4) (3, 5) and 6 are assigned distinct channel groups. Show that the total number of channels that can be supported is enhanced to 175 to cover the same service area. (10 marks) 1 (b) Explain in detail TDMA, CDMA and FDMA.(10 marks) 2 (a) Explain in detail the CDMA architecture.(10 marks) 2 (b) Explain in detail the IEEE 802-11 MAC Layer.(10 marks) 3 (a) Explain in detail LRWPAN.(10 marks) 3 (b) Compare CDMA 2000 & W-CDMA.(10 marks) 4 (a) Explain in detail Mobile IP.(10 marks) 4 (b) Explain possible attacks on wireless LAN and explain WEP in detail.(10 marks) 5 (a) Explain in detail Bluetooth architecture.(10 marks) 5 (b) Explain in detail GSM architecture.(10 marks)

Write short note on any four:

6 (a) FHSS and DSSS(5 marks) 6 (b) OFDMA(5 marks) 6 (c) MMDS(5 marks) 6 (d) WLAN Architecture(5 marks) 6 (e) WiMAX(5 marks)