SRM University 2007 B.Tech Electronics and Communications Engineering Bank : Wireless Communication - Question Paper

4. Explain about Reflection in Mobile Radio Propagation with the help of 2 ray Ground Reflection model.
5. Explain about Diffraction in Mobile Radio Propagation with the help of Knife Edge Diffraction model.
6. Prove that with necessary equations envelope of a faded channel is Rayleigh distributed.
7. Explain in detail about the Factors influencing fading.
8. With neat diagram, derive the formula for the Impulse response model.
9. What are the parameters involved in mobile multipath channels? define them in detail
10. Explain the Clark’s model for flat fading channel in detail.
11. Describe the antennas used in the cellular system in detail

UNIT IV
PART A
1. What is meant by modulation?
2. What are the different modulation techniques available?
3. What is meant by angle modulation?
4. Write the upper and lower bound for a frequency modulated signal?
5. Explain the trade-off ranging from SNR and Bandwidth in a FM signal.
6. Explain about the factors based on which digital modulation techniques are chosen.
7. What is meant by absolute bandwidth and half power bandwidth?
8. What is meant by Intersymbol Interference?
9. Explain how the Nyquist criterion is used for ISI computation.
10. Draw the waveforms for Unipolar NRZ, Bipolar NRZ, Manchester NRZ.
11. What is the function of a raised cosine rolloff filter? Write the transfer function of this filter.
12. Write a brief note about the Gaussian pulse shaping filter.
13. Write a short note on Differential PSK.
14. Write a short note on ?/4 QPSK
15. What is meant by constant envelope modulation?
16. What is meant by Psuedo random sequence?
17. What is meant by equalization and diversity?
18. What is the purpose of channel coding of a transmitted signal?
19. Define Prediction fault.
20. Explain about the linear Transversal equalizer.
21. What are the non linear methods available for equalization.
22. What are the factors that determine the performance of the algorithms used for adaptive equalization?
23. Write a short note on polarization diversity.
24. What is meant by channel coding?
25. What are the different quantization techniques available?
26. What is meant by sub band coding?
27. What is a voice excited vocoder?

PART B
1. Explain the RAKE receiver with a neat block diagram.
2. Explain about the different vocoders and their functions in detail.
3. What is the need for equalization in a receiver and discuss about the linear equalizer in detail.
4. Give an account of the algorithms used for adaptive equalization.
5. Explain about the space diversity reception methods in detail with neat diagrams.
6. Explain the binary frequency shift keying with suitable equations.
7. With the constellation diagram, discuss the M-ary PSK system.
8. Give an account of the direct sequence spread spectrum technique with necessary diagrams.
9. What is meant by quadrature phase shift keying? Write in detail about the transmission and detection of QPSK signals with block diagrams.
10. Explain in detail about the amplitude modulation and demodulation techniques in detail.
11. Explain the different methods used for FM detection.
12. Explain the binary phase shift keying and derive the probability of bit fault.
13. Write in detail about the detection techniques for a ? /4 QPSK signal.

UNIT- V
PART A

1. Give a few examples for IEEE 802 standards.
2. Define BSS & ESS
3. Define DCF & PCF
4. What are the functions of Physical layer of IEEE802.11?
5. What are the functions of MAC layer of IEE802.11?
6. What are the functions of LLC of IEEE802.11?
7. Explain Distribution service & Integration service.
8. Explain the 3 transition services based on mobility.
9. What are the associations’s related services based on AP?
10. Explain Reliable Data Delivery.
11. Give the kinds of authentication?
12. Differentiate IEEE802.11a & IEEE802.11b.
13. What do you mean by SIG?
14. What are the core protocols in the 5 layer stack of Bluetooth?
15. Define LMP.
16. Define L2CAP.
17. Define SDP.
18. Explain about the Cable Replacement Protocol.
19. What are the logical channels of L2CAP?
20. What are the fields available in the L2CAP commands?

PART B

1. Explain in detail about the different IEEE 802 standards & basic architecture of IEEE 802.11 Standard.
2. Explain the functions of different layers of WLAN & and the protocol architecture.
3. Explain the security considerations and the WEP algorithm for the MAC layer of IEEE 802.11.
4. Write short notes on Bluetooth overview & Protocol Stack architecture.
5. Write short notes on
a) Link Manager Specification
b) L2CAP
6. Write short notes on
a) Radio Specification
b) Baseband Specification

Earning:   Approval pending.