Mobile Communication Question Paper - Dec 16 - Electronics Engineering (Semester 8)

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yashbeer ★ 11k

Mobile Communication - Dec 16

Electronics Engineering (Semester 8)

Total marks: 80
Total time: 3 Hours INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1 Answer any four of the following:

1.a. What is meant by term umbrella cell and micro-cell in a cellular systems.

(5 marks) 10140

1.b A large city with an area of 1500 km$^2$ is needed to be covered by a finite number of cells with a radius of 2 km each. How many cell sites would be required assuming regular hexagonal shaped cells?

(5 marks) 10141

1.c Differentiate between CDMA, TDMA and FDMA.

(5 marks) 10142

1.d Explain the different handoff strategies from 1G to 3G

(5 marks) 11751

1.e What is RFID and what is the diference between active and passive RFID tags?

(5 marks) 10186

2.a Explain the GSM network architecture with a neat block diagram.

(10 marks) 10151

2.b What is frequency reuse? How does it influence the co-channel interference? What is the advantage of frequency reuse?

(10 marks) 11752

3.a A spectrum of 30 MHz is allocated to a wireless FDD cellular system which uses two 25 kHz simplex channels to provide full duplex voice and control channels. Compute the number of channels available per cell if a system uses, a) four cell reuse, b) seven cell reuse, c) 12 cell reuse and d) 13 cell's reuse.

(10 marks) 10137

3.b Compare GSM and CDMA technologies.

(10 marks) 10150

4.a Explain IS-95 forward and reverse channels.

(10 marks) 10166

4.b What is WCDMA air interface? Give important parameters of it.

(10 marks) 10173

5.a Describe UMTS technology with a neat block diagram.

(10 marks) 10174

5.b Write a detailed note on LTE.

(10 marks) 10179

6 Write short notes on any four of the following:

6.a Wireless sensor networks

(5 marks) 10283

6.b Speech coding in GSM

(5 marks) 10157

6.c Mobile IP

(5 marks) 10180

6.d IMT 2000

(5 marks) 11753

6.e WiMax

(5 marks) 10177

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