64128-mt----mobile Communications

NR

Code No: 64128/MT M.Tech. – I Semester Supplementary Examinations, September, 2008 MOBILE COMMUNICATIONS (Wireless & Mobile Communication) Time: 3hours

Max. Marks:60 Answer any FIVE questions All questions carry equal marks ---

1.a) b)

Discuss the evaluation of mobile Tele communications. Explain the main characteristics of mobile services through satellite media.

2.a) b)

Explain the salient coverage features of Satellite. Discuss the effect of Eclipse on satellite with a neat diagrams.

3.a) b)

Explain Hybrid constellations in detail. Discuss availability considerations for non geostationary Satellites.

4.a) b)

Explain spectrum sharing methods. Discuss the General propagation characteristics.

5.a)

Explain main functional entities of a ship Earth station with a neat block diagram. Discuss the biological effects on human with the usage of Mobile phones.

b) 6.a) b)

Draw the block diagram of conventional Transponder and Explain. Explain about “Inter Satellite Links”.

7.a) b)

Mention the main characteristics of ORB COM Satellites. Draw the block diagram of ELLIPSO Satellite and explain its functioning.

8.a) b)

Explain MSAT Network concept. Discuss the statistics of Mobile Propagation. *****