Question Paper: Mobile Communication Question Paper - May 17 - Electronics And Telecomm (Semester 7) - Mumbai University (MU)
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## Mobile Communication - May 17

### Electronics And Telecomm (Semester 7)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question No. 1 is compulsory
(2) Attempt any three questions from remaining five questions
(3) Draw neat diagrams wherever necessary

1(a) What is coherence bandwidth
(5 marks) 00

(5 marks) 00

1(c) Explain Foliage loss in propagation.
(5 marks) 00

1(d) Explain how prioritizing in Hand off is done
(5 marks) 905

2(a) Explain Handoff in 2G, 3G, & 4G in detail
(10 marks) 876 900

2(b) A receiver in an urban cellular radio system detects a 1mW signal at $d = d_0 = I$ meter from the transmitter. In order to mitigate co-channel interference effects, it is required that the signal received at any base station receiver from another base station transmitter which operates with the same channel must be below - 100 dBm. A measurement team has determined that the average path loss exponent in the system is $n = 3$. Determine the major radius of each cell in a 7-cell reuse pattern is used. What is the major radius of each cell if a 4-cell reuse pattern is used?
(10 marks) 00

3(a) Explain cellular networks (WMAN) evolution from 1G to 3G.
(10 marks) 00

3(b) Explain how GPRS architecture handles data call.
(10 marks) 888

4(a) Why are so many logical channels used in GSM? Explain GSM channel structure.
(10 marks) 892

4(b) Draw and explain 3GPPL TE architecture.
(10 marks) 908

5(a) Explain RPE-LTP speech coder as used in GSM.
(10 marks) 00

5(b) Explain IMT 2000 family.
(10 marks) 899

Q6) Write short notes on: (any two)

• (a) Problems in SDR communications
• (b) Multiantenna technologies 910