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    EC8652 Wireless Communication

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    Punitha
    This document is a question paper for the Sixth Semester Electronics and Communication Engineering examination covering the topic of Wireless Communication. It contains 3 parts with a total of 100 marks. Part A contains 10 short answer questions worth 2 marks each. Part B contains 5 long answer questions worth 13 marks each. Part C contains 1 long answer question worth 15 marks focusing on frequency planning for a cellular network or designing a cellular network using knife edge diffraction geometry.

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    EC8652 Wireless Communication

    Uploaded by

    Punitha
    144 views2 pages
    This document is a question paper for the Sixth Semester Electronics and Communication Engineering examination covering the topic of Wireless Communication. It contains 3 parts with a total of 100 marks. Part A contains 10 short answer questions worth 2 marks each. Part B contains 5 long answer questions worth 13 marks each. Part C contains 1 long answer question worth 15 marks focusing on frequency planning for a cellular network or designing a cellular network using knife edge diffraction geometry.

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    EC8652-Wireless-Communication

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    This document is a question paper for the Sixth Semester Electronics and Communication Engineering examination covering the topic of Wireless Communication. It contains 3 parts with a total of 100 marks. Part A contains 10 short answer questions worth 2 marks each. Part B contains 5 long answer questions worth 13 marks each. Part C contains 1 long answer question worth 15 marks focusing on frequency planning for a cellular network or designing a cellular network using knife edge diffraction geometry.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    144 views2 pages

    EC8652 Wireless Communication

    Uploaded by

    Punitha
    This document is a question paper for the Sixth Semester Electronics and Communication Engineering examination covering the topic of Wireless Communication. It contains 3 parts with a total of 100 marks. Part A contains 10 short answer questions worth 2 marks each. Part B contains 5 long answer questions worth 13 marks each. Part C contains 1 long answer question worth 15 marks focusing on frequency planning for a cellular network or designing a cellular network using knife edge diffraction geometry.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    www.binils.

    com
    Anna University | Polytechnic | Schools
    Reg. No. :

    Question Paper Code : 40453

    B.E./B.Tech. DEGREE EXAMINATIONS, NOVEMBER/DECEMBER 2021.

    Sixth Semester

    Electronics and Communication Engineering

    EC 8652 – WIRELESS COMMUNICATION

    (Common to: Computer and Communication Engineering/Electronics and


    Telecommunication Engineering)

    (Regulations 2017)

    Time : Three hours Maximum : 100 marks


    Answer ALL questions.

    PART A — (10 × 2 = 20 marks)

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    1. What is Small Scale fading?
    2. Write the significance of link budget.
    3. Define frequency reuse.
    4. What is the trade off that exists between system capacity and coverage?
    5. How PAPR issue can be addressed?
    6. Why GMSK is better than QPSK?
    7. How equalization is achieved through Zero Forcing Algorithm?
    8. How error probability is computed for fading channel in SISO system?
    9. Define Pre-coding.
    10. How beam forming can improve performance of communication system?

    PART B — (5 × 13 = 65 marks)
    11. (a) Derive the two ray ground model expressing the relationship between
    received power and path loss component.
    Or
    (b) (i) Find the Fraunhofer distance for an antenna with maximum
    dimension of 1 m and operating frequency of 60 GHz. If antennas
    have unity gain, calculate the path loss. (3)
    (ii) If a transmitter produces 50W of power, express the transmit power
    in units of dBm, dBW. If 50 W is applied to a unity gain antenna
    with a 900 MHz carrier frequency, find the received power in dBm
    at a free space distance of 100m from the antenna. What is Pr
    (10 Km)? Assume unity gain for the receiver antenna. (10)

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    Anna University, Polytechnic & Schools
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    Anna University | Polytechnic | Schools
    12. (a) With neat sketch, illustrate the first tier co-channel interference caused
    in a cluster size of 7. Also derive the expression that relates the system
    capacity in terms of co-channel reuse ratio.
    Or

    (b) How many users can be supported for 0.5% blocking probability for
    following the trunked channels in a blocked calls cleared systems? 1,5,10,
    20, 100. Assume each user generates 0.1 Erlangs of traffic.

    13. (a) Compare and contrast QPSK, p/4 QPSK, MSK and GMSK.
    Or

    (b) Explain the working principal of OFDM, also the significance of cyclic
    prefix and windowing.

    14. (a) Explain the working mechanism of Equalizer with a simplified


    communication system that uses adaptive equalizer at the receiver.
    Or

    (b) Write short note on

    (i) Rake receiver (4)

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    (ii) Space Diversity and

    (iii) Frequency diversity


    (4)

    (5)

    15. (a) Discuss about the Space Time Block codes and Derive Alamouti Block
    Codes for a 2 × 1 MIMO system.
    Or
    (b) Compare the error performance of digital modulation techniques for
    AWGN channel, wireless fading channels and discuss the impact made
    by diversity techniques in the performance.

    PART C — (1 × 15 = 15 marks)
    16. (a) Given a foot print by the service provider, prepare and illustrate the
    frequency planning addressing all practical limitations that can be
    envisaged. (Hint: N=7).
    Or
    (b) Design a cellular network in a hilly terrain using knife edge Diffraction
    geometry.

    —————————

    2 40453

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