B.E. Electronics & Telecommunication, Wireless Networks (WN), Semester 8, May 2009.

B.E. Electronics & Telecommunication,

Wireless Networks (WN), Semester 8, May 2009.

Con. 3016-09

VR-4282

(REVISED COURSE)

(3 Hours)

[Total Mark: 100]

N.B. (1) Question No 1 is compulsory.

(2) Attempt any four questions out of remaining six questions.

(3) Draw neat sketches wherever required.

(4) Assume suitable data if required.

1. (a) Explain RAKE receiver in CDMA. ----- (5 Marks)

(b) Explain various states in Bluetooth system. ----- (5 Marks)

(c) List the major technical differences between cdma-2000 and W-CDMA. ---- (5 Marks)

(d) Explain authentication procedures used in IS-95. ---- (5 Marks)

2. (a) What are hand off messages in IS-95? Explain them with threshold. ----- (10 Marks)

(b) Describe the three search windows used by the mobile to track the received pilot Signals in CDMA system. ---- (10 Marks)

3. (a) Draw and explain architecture of WAP. ---- (10 Marks)

(b) Draw the architecture of air loop WLL system. Explain each block in detail. ---- (10 Marks)

4. (a) Explain various functionalities of LAC sub layers on common and dedicated Channels. ---- (10 Marks)

(b) Explain in detail Bluetooth security features and security levels with proper diagrams. ---- (10 marks)

5. Explain in detail with their flow diagrams, various call processing states in CDMA. ---- (20 Marks)

6. (a) “CDMA is an interference limited system". Give proper justification to support this statement. Also explain in short methods used for power control in CDMA environment. ---- (10 Marks)

(b) List forward link features for CDMA-2000. Explain each in brief. ---- (10 Marks)

7. Write short notes on:- ----- (20 Marks)

(a) Cell loading

(b) Gold, Kasami and Walsh Sequences

(c) FHSS used in IEEE 802.11.

(d) OFDM used in WLL.