ர 04000EC404052005 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Eighth Semester B.Tech. Degree Examinations, September 2020

Course Code: EC404
Course Name: ADVANCED COMMUNICATION SYSTEMS
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks

1 a) Explain Frequency Modulated microwave radio system with suitable block (8)
diagram.
b) Explain the basic principles involved in the compression of fixed pictures. (7)
2 a) Explain how the diversity is enhancing the performance of radio wave (8)
propagation? Explain frequency diversity and space diversity with block
diagram.
b) Explain the working principles of Liquid Crystal displays. Compare it with (7)
plasma and LED displays
3 a) Explain Free-Space Path Loss and derive the expression. Determine the path loss (7)
for a 3.4-GHz signal propagating 20,000 ൩.
b) With a block diagram explain the DVB-T system. (8)
PART 13
Answer any two full questions, each carries 15 marks.
4 a) State Kepler’s laws of planetary motion. Illustrate in each case their relevance to (7)

artificial satellites orbiting the earth.

b) With the help of figure, describe Wireless Local Loop technology. (4)
c) Explain with figure a wide area paging system. (4)
5 a) Explain Global Positioning System. (7)
b) Explain WIMAX architecture with necessary figure. (8)

6 a) Explain link budget calculations in satellite communication systems. Derive the (8)
expressions for uplink and down link
b) Compare the important characteristics of second-generation cellular networks, (7)

third generation wireless networks and fourth generation wireless technologies.

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