Concepts of Wireless Networking 2068

Attempt all questions.

1. What are the major challenges in wireless communication network? How can we combat those challenges? (3+3)

2. What are Doppler Effect and Doppler shift? Calculate Doppler shift for a person walking at a 3 km/hr in 900 MHZ cellular system. (6)

3. Define modulation. Explain QPSK modulation technique.

4. Why channel equalization is used in wireless communication? Explain linear channel equalization. (1+5)

5. Define co-channel interference and adjacent channel interference. In a cellular system, the acceptable signal-to-cochannel interference ratio is 20dB. From the measurement the path loss exponent is found to be 4. What is the minimum cluster size? (2+4)

6. Explain briefly about different techniques for capacity increase in cellular system.

7. Explain time division multiple access technique. (3+3)

8. Describe the steps involved in setting up the call between MSC and the called MSC with flow diagram. (6)

9. Write short notes on MIPv6. Also mention the advantages over MIPv4. (6)

10. Write short notes on (Any TWO): (2×3)

a) Fading

b) Probability of error of BPSK

c) Aloha

d) Call Admission Control (CAC)