EC8791 - MOBILE COMMUNICATION
Previous Year Question Paper
Part A:
1. Explain the concept of handoff and discuss the different types of handoff strategies.
2. What is the significance of CDMA in mobile communication? Discuss the fundamental principles of CDMA.
3. List and explain the various methods used for channel allocation in cellular systems.
4. Briefly discuss the concepts of rake receiver and multipath fading in mobile communication.
5. Define the co-channel interference and adjacent channel interference in cellular systems. Explain how these interferences can be minimized.
6. What is the concept of a frequency reuse factor? Explain its significance in cellular network design.
7. Write short notes on the following:
- FDMA
- TDMA
- MAC
Part B:
8. (a) Explain the operation of a GSM network with a neat block diagram. (10 Marks)
(b) Discuss the advantages and disadvantages of using TDMA as a multiple access technique. (6 Marks)
9. (a) Derive the expression for the average received power in a Rayleigh fading channel. (8 Marks)
(b) Explain the operation of a diversity receiver and discuss its benefits in reducing the effects of fading. (8 Marks)
10. (a) Discuss the operation of a cellular system with respect to call processing. Explain the steps involved in initiating and terminating a call. (8 Marks)
(b) What is call dropping? Explain the various factors that can contribute to call dropping in cellular networks. (8 Marks)
11. (a) Describe the power control mechanisms used in CDMA systems. (8 Marks)
(b) Draw and explain the structure of a CDMA frame. (8 Marks)
12. (a) Explain the operation of a rake receiver. Include a block diagram for illustration. (8 Marks)
(b) Derive the expression for the processing gain of a rake receiver. (8 Marks)