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  • Anna University : B.E Electronics & Communication Engineering B.E/B.Tech Degree Examination, April/May 2010 Question Papers

    Anna University : B.E Electronics & Communication Engineering B.E/B.Tech Degree Examination, April/May 2010 Question Papers

    QUESTION Paper Code- D2197

    B.E/B.TECH. DEGREE EXAMINATION, APRIL/MAY 2010

    EIGHTH SEMESTER

    ELECTRONICS AND COMMUNICATION ENGINEERING

    EC 1451-MIBILE COMMUNICATION
    (REGULATION 2004)
    (Common to B.E (part time) seventh semester regulation 2005)

    Time:3 hrs Maximum:100 marks

    Answer ALL Questions

    PART A(10*2=20 marks)

    1.List any four advantage of third generation (3G) mobile networks

    2.Write down the formula for co-channel reuse ratio.

    3.What is Doppler shift.

    4.What is meant by coherence bandwidth.

    5.Name the four space diverrsity receptiob technique.

    6.Define absolute bandwith.

    7.what is meant by vocoders.

    8.What is self-jamming in CDMA.

    9.What is the purpose of SIM.

    10.What are the five functional entities of a DECT system.

    PART B (5*16=80 marks)

    11. (a) (i) Explain in detail the various cellular components. (8)

    (ii)Explain the fundamentals of Digital cellular systems. (8)

    OR
    (b) (i) Explain the process of operation of paging systems. (8)

    (ii)Describe the steps involved in making a cellular telephone call (8)

    12. (a) Derive the Impluse response model of a multiplepath channel. (16)
    OR
    (b) Explain in detail about type of small scale fading. (16)

    13. (a)(i)Write a note on RAKE recevier, with block diagram. (10)
    (ii)Explain frequency diversity and time diversity . (6)

    OR
    (b)Explain the concept of minimum shift keying and Gaurion MSK (16)

    14. (a) Explain TDMA and discuss the time division Multiple acess frame structure (16)

    OR
    (b) (i) Draw the block diagram of RELP encoder. Explain the function of coder. (6)
    (ii)Enumerate the process for selecting the optimum excitation signal (10)

    15. (a) (i) Discuss the features and service of GSM. (8)
    (ii)Explain the GSM system architecture with the neat sketch. (8)

    OR

    (b) discuss the channels and cellular operation in Advanced Mobile Phone
    Systems(AMPS). (16)

  • CAT aspirants hope for fewer hurdles this year

    CAT aspirants hope for fewer hurdles this year

    Having burnt its fingers last year with the online CAT exams, the IIMs are leaving no stone unturned to ensure that the exam goes off smoothly this year. IIMs, along with their US based partners Prometrics, have uploaded preparatory videos on their website and on YouTube, so students can understand how to navigate through the exam. This apart, there would also be mock CAT tests held a month before the real thing. Also, the CAT shall be spread across 20 days this year, so there is less load on the servers.

    Last year, more than 17,000 applicants suffered because of navigational difficulties and because the servers kept crashing. Nandini Dasgupta says she went through a torrid time during last year’s CAT because of the servers crashing repeatedly.
    “They should use more powerful servers that don’t crash as easily. The mock CATs and the videos were all fine and quite helpful. But nothing will make any sense if things go awry on the D-day,” she said.

    Aditya Krishnan says holding the exams across 20 days would mean the IIM will need to come up with 20 different sets of question papers. “Last year, there were a lot of complaints about some sets being easier than the others and about the IIMs normalising scores. If there were so many problems for just four sets of questions last year, then imagine what would be the scene this time,” he said.

    Source: Deccan Chronicle

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