Download JNTUA B.Tech 4-2 R13 2018 April 13A04802 Advanced 3G And 4G Wireless Communications Question Paper

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Code: 13A04802

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B.Tech IV Year II Semester (R13) Regular & Supplementary Examinations April 2018

ADVANCED 3G & 4G WIRELESS COMMUNICATIONS

(Electronics and Communication Engineering)

Time: 3 hours

Max. Marks: 70

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PART - A

(Compulsory Question)

1. Answer the following: (10 X 02 = 20 Marks)
   1. Define Rayleigh Fading.
   2. What is delay spread?
   3. Differentiate between wired and wireless communication.

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   4. List out the essential elements of a cellular system.
   5. What is CDMA? Give its advantages.
   6. What are the issues in OFDM?
   7. Briefly explain about multiplexing in MIMO.
   8. Write down the features of Ultra Wide Band.

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   9. What do you understand by GSM?
   10. What are the limitations of WiMAX?

PART - B

(Answer all five units, 5 X 10 = 50 Marks)

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UNIT - I

1. Explain in detail about BER of wired and wireless communication.

   OR

2. Discuss in detail about Multi-antenna Maximal Ratio Combiner.

UNIT - II

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1. Describe the following channel models:
   1. Doppler spectrum.
   2. Jakes model.

   OR

2. Give a detailed note on Multiple Access Technologies for Cellular Communication. Give its applications.

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UNIT - III

1. Give the comparison between RAKE receiver and CDMA receiver.

   OR

2. Explain in detail about Multi carrier Modulation and Cyclic Prefix in OFDM.

UNIT - IV

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1. Write short notes on:
   1. MIMO Spatial Multiplexing.
   2. MIMO Diversity.

   OR

2. Describe about the Bit Error Rate Performance of UWB.

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UNIT - V

1. Explain about GSM standard with essential diagrams.

   OR

2. Discuss in detail about WCDMA with necessary diagram.

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