Cellular Network and Explain Frequency Reuse

Topics: Cellular network, Fading, Error detection and correction Pages: 12 (1191 words) Published: September 12, 2013
EC2401- WIRELESS COMMUNICATION QUESTION BANK IV ECE

UNIT I SERVICES AND TECHNICAL CHALLENGES

Part-A
1. Give any four examples of wireless communication systems. 2. What is a base station?

3. List any four advantages of third generation (3G) mobile networks. 4. Define co channel cells.

5. What are the reasons for choosing Hexagonal cells? 6. Define footprint 7. Define Frequency Reuse

8. What are the advantages of micro cell zone concept? 9. Define cluster.

10. Write the objectives of channel assignment strategies.

12. What is borrowing strategy in channel assignment? 13. Define handoff?

14. What happens if the Handoff threshold is high?

16. Define cell dragging.

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17. Define MAHO. 18. Write the formula for co-channel reuse ratio.

19. What is cell splitting? 20. List the methods to improve coverage and capacity in cellular systems. 21. What is intersystem handoff? 22. Define Co-channel Interference 23. Define Adjacent-channel Interference

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15. Define Dwell time.

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11. Differentiate Fixed and Dynamic channel assignment strategies.

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24. Define near-far effect

Part-B
1. Explain the cellular system architecture in detail. 2. Explain frequency reuse in detail.

3. Discuss different techniques used for improving coverage and capacity in cellular systems. 4. Explain the various types of Handoff processes available 5. Explain Trunking and Grade Of Service. 6. Compare Between FDMA, TDMA, CDMA, SDMA.

9. Explain the operations of CDMA

WIRELESS PROPAGATION CHANNELS

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system?

2. What is scattering?

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3. What is diffraction? 4. Mention any four Indoor propagation models 5. Define Brewster angle? 6. Calculate the Brewster angle for a wave impinging on ground having a permittivity εr = 2.

7. List out any three small-scale fading effects of multipath in the radio channel. 8. What is Doppler shift?

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1. What are all the three basic propagation mechanisms in mobile communication

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UNIT- II

Part-A (2 Marks)

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8. Explain TDMA & FDMA

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7. What do you mean by Duplexing? Explain the types of Duplexing.

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9. What are Fresnel Zones? 10. List out the types of small-scale multipath measurements techniques 11. Consider a transmitter, which radiates a sinusoidal carrier frequency of 1850MHZ. For a vehicle moving 60mph, compute the received carrier frequency if the mobile is moving directly away from the transmitter. 12. Define Doppler spread and Write the relationship between Doppler spread and Coherence time. 13. 14. What is meant by Coherence bandwidth?

14. Differentiate Fast fading and slow fading in Small Scale fading

15. What are the Time Dispersion Parameters of Multipath channels?

2. Derive the equation of the Path loss using Two-Ray Model with neat diagrams. 3. Explain knife Edge Diffraction Model

6. Explain the various methods for small scale measurement 7. 8. Explain detail about type of small scale fading?

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Explain Clarke’s model for flat fading?

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1. What is the function of channel encoder? 2. Define BFSK 3. Briefly explain about coherent detection 4. Define baud rate 5. What is the relation of bit rate and baud rate in QPSK

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5. What is small scale fading? What are the factors influencing small scale fading?

WIRELESS TRANSCEIVERS Part-A (2 Marks)

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4. Derive the Impulse response model of a Multipath channel.

UNIT III

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1. With neat diagrams explain the Free Space Propagation Model?

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Part-B

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6. What is the function of a carrier recovery circuit? 7. What are the disadvantages of QPSK? 8. In π/4 QPSK the maximum phase change is limited...
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