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Posted Date: 30 Dec 2008 Posted By: harshavardhan Member Level: Gold
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2005 Jawaharlal Nehru Technological University IV B.Tech I Semester Regular Examinations, November 2005 CELLULAR & MOBILE COMMUNICATION Question paper
Code No: RR411701 Set No.1
IV B.Tech. I Semester Regular Examinations, November -2005
CELLULAR & MOBILE COMMUNICATION
(Electronics & Telematics)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Present the model of the mobile transmission medium and the fading charac-
teristics?
(b) Explain in detail coherence bandwidth and delay spread? [8+8]
2. (a) Between the pager , a cellular phone and cordless phone which device will
have the longest battery life between charging? Why?
(b) Explain the importance of K = i2+ij + j2. [8+8]
3. (a) Illustrate the real time co channel interference measurement at the mobile
radio transceiver?
(b) Discuss the diversity schemes for interference reductions at both mobile unit
and cell site? [8+8]
4. (a) Discuss about the multi path propagation present the associated losses and
place the problem?
(b) Discuss about the point to point and area to area prediction model for cell
coverage? [10+6]
5. (a) Explain the fundamentals of antenna gain?
(b) Explain the concept of horizontally space diversity antennas [8+8]
6. Explain the following in detail concern to the mobile system
(a) Setup channel
(b) Accesses channel
(c) Paging channel
(d) Voice channel. [16]
7. (a) List and briefly define different performance metrics that may be used to make
the handoff decision?
(b) If the number channels at the cell site N=45 the call holding time is 1.76minutes
The number of originated calls per hour expressed as is 2270. The number
of handoff calls attempted per hour is expressed as2 is 80 Find the probabil-
ity of the queuing handoff. calls but not the originated calls . Also find the
probability of the queuing the originated calls but not the handoff calls?
8. Explain the different approaches to increase the coverage of a cellular system in a
noisy environment.
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