B.E. Electronics & Telecommunication, Wireless Networks (WN), Semester 8, May 2013.

B.E. Electronics & Telecommunication,

Wireless Networks (WN), Semester 8, May 2013.

Con. 8551–13.

GS - 3673

(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 forward link features of CDMA 2000. ---- (4 Marks)

(b) Explain concept of HSDPA with respect to WCDMA. ---- (4 Marks)

(c) What is adaptive multirate coding? ----- (4 Marks)

(d) Give different WLAN topologies. ----- (4 Marks)

(e) Explain the concept of OFDM. ---- (4 Marks)

2. (a) Explain in detail components of sensor node. ---- (10 Marks)

(b) Explain in detail various IEEE 802.11 standard used in wireless Network. ---- (10 Marks)

3. (a) Difference between WCDMA and CDMA 2000. ---- (10 Marks)

(b) Calculate the downlink cell load factor and number of voice users per cell for a WCDMA system using the following data. ---- (10 Marks)

- Information Rate (Ri) = 12.2 Kbps

- Chip Rate (Rc) = 3.84 Mops

- Required Eb/Nt = 4 dB

- Average interference factor due to other cells = 0.5

- Orthogonality factor = 0.6

- Interference margin = 3 db

4. (a) Give UMTS Air – Interface specifications, also explain 3 types of channels defined in UMTS. --- (10 Marks)

(b) Explain blue tooth protocol stack. ---- (10 Marks)

5. (a) Describe forward link and reverse link physical channels for CDMA 2000. ---- (10 Marks)

(b) Explain WLAN technologies in detail. ---- (10 Marks)

6. (a) Discuss in detail WAP programming model. ---- (8 Marks)

(b) Using the following data for GSM 1800, Develop downlink and uplink budget and determine cell radium. ---- (12 Marks)

- Base station transmit power = (P_b) = 36 dBM = 4 W

- Mobile station transmit power = P_m = 24 db_m

- Base station noise figure = 5 dB_s

- Mobile station (hand held unit) noise figure = 8 dBs

- Base station transmit and receive antenna gain = G_A= 18 dBi

- Mobile antenna gain = 0 dBi

- Required signal to noise ratio (SNR) = 12 dB

- Transmit antenna Cable, Connector Loss = L_c = 5 dB

- BS receiver antenna cable, connector Loss (L_c = 2 dB)

- Orientation / body loss of mobile = 3 dB

- Shadow fading = 10.2 dB

- Thermal noise density = -174 dBm/Hz

- Antenna diversity gain at B_s = 5 dB

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

(a) Wimax

(b) Zigbee Protocol.