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VII Semester B.Tech. - Including Part Time Degree (Reg./Sup./lmp.)
Examination, April 2012
(2007 Admn. Onwards)
PT2K6/2K6 EC 804 : WIRELESS MOBILE COMMUNICATION
Time : 3 Hours Max. Marks : 100
Instruction : Answer all question.
1. a) Explain different standards in 1G, 2G, 3G. [Marks 5]
b) Explain the types of modulation used in GSM, CDMA, HSCSD, GPRS, EDGE. [Marks 5]
c) Explain frequency reuse. What is frequency reuse factor in GSM, lS-95. [Marks 5]
d) Explain Hard-off strategy used in GSM, lS-95. [Marks 5]
e) Explain small scale propagation model. [Marks 5]
f) Explain coherence time and coherence B.W. [Marks 5]
g) Explain gold sequence. [Marks 5]
h) Explain how power control is done in CDMA. [Marks 5]
2. A) Explain different types of interference in cellular communication system. [Marks 15]
Derive Q = sqrt(3N) where Q is the co-channel reuse ratio
N is the cluster size , Prove S/I=(sqrt(3N)/Io).
OR
B) Explain in detail how carriage and capacity can be increased in cellular system. [Marks 15]
A) Explain different types of fading in wireless communication system. Explain :
a) coherence time
b) coherence B.W. [Marks 15]
OR
B) Explain:
1) Flat fading
2) Frequency selective fading
3) Fast fading
4) Slow fading
5) Doppler shift. [Marks 15]
4. A) Explain why power control is required in CDMA. Explain how capacity can
be increased in CDM system. [Marks 15]
OR
B) Explain different types of spread spectrum with examples. Explain where
each spread spectrum used practically. [Marks 15]
5. A) Explain the following with architecture and type of modulation used :
i) GSM
ii) GPRS
iii) HSCSD [Marks 15]
OR
B) Explain the difference between 1G, 2G, 3G system. Give example for each
system and explain the different system used in each system. [Marks 15]
VII Semester B.Tech. - Including Part Time Degree (Reg./Sup./lmp.)
Examination, April 2012
(2007 Admn. Onwards)
PT2K6/2K6 EC 804 : WIRELESS MOBILE COMMUNICATION
Time : 3 Hours Max. Marks : 100
Instruction : Answer all question.
1. a) Explain different standards in 1G, 2G, 3G. [Marks 5]
b) Explain the types of modulation used in GSM, CDMA, HSCSD, GPRS, EDGE. [Marks 5]
c) Explain frequency reuse. What is frequency reuse factor in GSM, lS-95. [Marks 5]
d) Explain Hard-off strategy used in GSM, lS-95. [Marks 5]
e) Explain small scale propagation model. [Marks 5]
f) Explain coherence time and coherence B.W. [Marks 5]
g) Explain gold sequence. [Marks 5]
h) Explain how power control is done in CDMA. [Marks 5]
2. A) Explain different types of interference in cellular communication system. [Marks 15]
Derive Q = sqrt(3N) where Q is the co-channel reuse ratio
N is the cluster size , Prove S/I=(sqrt(3N)/Io).
OR
B) Explain in detail how carriage and capacity can be increased in cellular system. [Marks 15]
A) Explain different types of fading in wireless communication system. Explain :
a) coherence time
b) coherence B.W. [Marks 15]
OR
B) Explain:
1) Flat fading
2) Frequency selective fading
3) Fast fading
4) Slow fading
5) Doppler shift. [Marks 15]
4. A) Explain why power control is required in CDMA. Explain how capacity can
be increased in CDM system. [Marks 15]
OR
B) Explain different types of spread spectrum with examples. Explain where
each spread spectrum used practically. [Marks 15]
5. A) Explain the following with architecture and type of modulation used :
i) GSM
ii) GPRS
iii) HSCSD [Marks 15]
OR
B) Explain the difference between 1G, 2G, 3G system. Give example for each
system and explain the different system used in each system. [Marks 15]
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