Air Interface - Nikko

21 Questions

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Air Interface - Nikko

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Questions and Answers
  • 1. 
    The air interface is the interface located between the _______ and the _________.
    • A. 

      UE, base station

    • B. 

      Base station, base station controller

    • C. 

      Base station controller, mobile switching center

    • D. 

      Node B, RNC

  • 2. 
    In the UMTS Standard, the air interface is referred as the ______.
  • 3. 
    The transmission in the air interface is based on CDMA tecthnology and it's called _____________ because it's using 3 times the bandwidth which is used by the CDMA.
  • 4. 
    Before sending the data over the Uu interface, data need not to be processed in order to comply with the air interface requirement in terms of bandwidth and QoS.
    • A. 

      True

    • B. 

      False

  • 5. 
    1 and 2 represents the steps in data processing before data is sent through the air interface while 3 and 4 represents the steps in data processing after data is received from the air interface. 1,2,3 and 4 refer to _________, _________, _______ and _________, respectively.
    • A. 

      Depreading, Wideband Modulation, Demodulation, Spreading

    • B. 

      Spreading, Wideband Modulation, Demodulation, Despreading

    • C. 

      Depreading, Demodulation, Wideband Modulation, Spreading

    • D. 

      Spreading, Demodulation, Wideband Modulation, Despreading

  • 6. 
    Channel coding refers to _____________.
    • A. 

      A technique used to protect data against losses in the Iu interface.

    • B. 

      A technique used to backup data in the Uu interface.

    • C. 

      A technique used to protect data against losses in the air interface.

    • D. 

      None of the above

  • 7. 
    The process of adding bits or puncturing in a controlled way in order to make a correct framing is called ___________.
  • 8. 
    What is the spreading factor given a chip rate of 1 kbps and a data symbol rate of 512 bps?
    • A. 

      2

    • B. 

      0.5

    • C. 

      512 kbps

    • D. 

      1.5 kbps

  • 9. 
    After rate matching, the data from previous block comes with a tight bandwidth and a higher output power. So in order to reduce the power of the signal, we multiply it by a _______________ so that the signal will be spread all over the total bandwidth reducing then the power under the noise level.
    • A. 

      Channelization code

    • B. 

      Subscriber code

    • C. 

      Scrambling code

    • D. 

      None of the above

  • 10. 
    Given the bipolar data and spreading code below, sketch the resulting data after spreading on the grid provided. Sketch answer:
  • 11. 
    UMTS modulation schemes for both uplink and downlink, although somewhat different, are both based around GMSK formats.
    • A. 

      True

    • B. 

      False

  • 12. 
    As the uplink and downlink have different requirements for both uplink and downlink, the exact format for the modulation format used on either direction is slightly different.
    • A. 

      True

    • B. 

      False

  • 13. 
    It is necessary to ensure that the data is carried efficiently over the available spectrum and therefore, maximum use is made of the available spectrum and hence, the capacity of the system is minimized.
    • A. 

      True

    • B. 

      False

  • 14. 
    Which of the following constellation diagrams represent QPSK modulation?                                                                    A.                                                             B.                                                
    • A. 

      A only

    • B. 

      B only

    • C. 

      Both A and B

    • D. 

      None of the above

  • 15. 
    OQPSK's difference with QPSK is that in OQPSK, jumps are permitted over the intermediate states.
    • A. 

      True

    • B. 

      False

  • 16. 
    Multipath propagation is _________.
    • A. 

      Is the use of multiple antennas at both the transmitter and receiver to improve communication performance.

    • B. 

      The phenomenon where microwave signals are reflected by different obstacles before they reach the BTS or the MS due to the environment of the serving area.

    • C. 

      A signal processing technique used in sensor arrays for directional signal transmission or reception. This is achieved by combining elements in the array in such a way that signals at particular angle experience constructive interference and while others experience destructive interference.

    • D. 

      None of the above

  • 17. 
    In order to deal with multipath propagation, the _________ receiver is used.
    • A. 

      RAKE

    • B. 

      RAYKE

    • C. 

      RAEK

    • D. 

      None of the above

  • 18. 
    Spreading is done using ____________.
    • A. 

      Channelization codes

    • B. 

      Scrambling codes

    • C. 

      Both A and B

    • D. 

      None of the above

  • 19. 
    Channelization codes are used _______________.
    • A. 

      To separate physical data and control data from the same terminal in the uplink direction and to separate connection to different terminals in the same cell in the downlink direction.

    • B. 

      To separate physical data and control data from the same terminal in the uplink direction and to separate connection to different terminals in the same cell in the downlink direction.

    • C. 

      None of the above

  • 20. 
    Channelization codes are orthogonal. Which of the following sets of codes are orthogonal to each other? Set A: Set B: Set C:
    • A. 

      Set A only

    • B. 

      Set B only

    • C. 

      Set C only

    • D. 

      Set A and Set B

    • E. 

      Set B and Set C

    • F. 

      Set A and Set C

    • G. 

      None of them

  • 21. 
    Scrambling codes are used to ___________.
    • A. 

      Distinguish in the uplink between different users and in the downlink between different Nobe B's.

    • B. 

      Distinguish in the uplink between different Node B's and in the downlink between different userss.

    • C. 

      None of the above