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Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION, MAY 2019

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) With a block schematic explain microwave radio IF repeater station. (8)
b) Explain Hot standby protection switching arrangement of a microwave radio system. (7)
2 a) Witha block diagram explain the DVB-T system. (10)
b) How the diversity is enhancing the performance of radio wave propagation? (5)

3 9) How the images compressed with the help of Discrete Cosine Transform(DCT)? (10)

Explain.
b) Compare LED and LCD display systems. (5)
PART 13
Answer any two full questions, each carries 15 marks.
4 a) Explain the effect of Non-spherical shape of earth on a satellite orbit. (5)

0) With the help of a block diagram briefly explain Satellite Transponder (5)
Subsystem.

©) A satellite TV signal occupies the full transponder bandwidth of 36 MHz and it (5)
must provide a C/N ratio at the destination earth station of 22 dB. Given that the
total transmission loss is 210 dB and the destination earth station G/T ratio is
31 dB/K. Calculate the satellite EIRP required.
Given value k in dB is - 228.6 dB.

5 a) Briefly describe about global positioning satellite system. (5)
b) With the help of figure, describe WLL technology and its advantages. (7)
c) Mention the features of Bluetooth. (3)
6 a) What are the different versions of WLAN. (5)
b) Compare 1G, 20,36 & 4G systems. (7)
c) State the differences between TDD & FDD in cellular communications. (3)

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