A Quiz On Mobile Communication! Trivia

20 Questions | Total Attempts: 540

SettingsSettingsSettings
Please wait...
A Quiz On Mobile Communication! Trivia

.


Questions and Answers
  • 1. 
    Radio link bandwidth utilization factor is defined as the transmitted data rate divided by the available channel bandwidth
    • A. 

      True

    • B. 

      False

  • 2. 
    Power-limited region is when
    • A. 

      Bandwidth utilization factor is less than 1

    • B. 

      Bandwidth utilization factor is greater than 1

  • 3. 
    Bandwidth-limited region is when
    • A. 

      Bandwidth utilization factor is greater than 1

    • B. 

      Bandwidth utilization factor is less than 1

  • 4. 
    The most efficient method to increase the channel capacity operates in a power-limited region is
    • A. 

      Increase signal to noise ratio at the receiver

    • B. 

      Use MIMO at the receiver and the transmitter

    • C. 

      Increase the channel bandwidth

    • D. 

      Increase the transmitter power

    • E. 

      Use multiple antennas at the receiver side (receiver antenna diversity)

    • F. 

      Use multiple antennas at the transmitter side (beam focusing)

    • G. 

      Reduce the noise power at the receiver (use advanced receiver RF design)

  • 5. 
    The most efficient method to increase the channel capacity operates in a bandwidth-limited region is
    • A. 

      Increase signal to noise ratio at the receiver

    • B. 

      Use MIMO at the receiver and the transmitter

    • C. 

      Increase the channel bandwidth

    • D. 

      Increase the transmitter power

    • E. 

      Use multiple antennas at the receiver side (receiver antenna diversity)

    • F. 

      Use multiple antennas at the transmitter side (beam focusing)

    • G. 

      Reduce the noise power at the receiver (use advanced receiver RF design)

  • 6. 
    Interference is the dominant source of radio-link impairment in mobile communications.
    • A. 

      True

    • B. 

      False

  • 7. 
    Combining 16QAM or 64QAM with channel coding may produce less bit-error probability, compared to QPSK.
    • A. 

      True

    • B. 

      False

  • 8. 
    16QAM or 64QAM uses more bandwidth and produces less bit-error probability compared to QPSK.
    • A. 

      True

    • B. 

      False

  • 9. 
    The modulation scheme that has the highest variations in instantaneous transmit power is   
    • A. 

      64QAM

    • B. 

      QPSK

    • C. 

      16QAM

  • 10. 
    Even though the large variations in instantaneous transmit power for higher-order modulation schemes, the transmit power amplifier can operate with 100% efficiency.
    • A. 

      True

    • B. 

      False

  • 11. 
    The higher-order modulation schemes are more suitable for the downlink compared to the uplink due to variations in instantaneous transmit power.
    • A. 

      True

    • B. 

      False

  • 12. 
    In order to provide high data rates as efficiently as possible in terms of required signal-to-noise ratio, the transmission bandwidth should be at least of the same order as the data rates to be provided (bandwidth utilization factor =1).
    • A. 

      True

    • B. 

      False

  • 13. 
    Time dispersion
    • A. 

      Time dispersion occurs when the transmitted signal propagates to the receiver via multiple paths with different delays.

    • B. 

      Is the time required for a data symbol to propagate from the base station to the terminal mobile

    • C. 

      Is the delay of a radio packet

  • 14. 
    Frequency selectivity
    • A. 

      Is the frequency response of a channel that suffers of a time dispersion problem

    • B. 

      Is the Doppler dispersion

    • C. 

      Is the bandwidth of the channel that is selected in frequency division multiplexing

    • D. 

      None of the above

  • 15. 
    It is easier to design equalizers for wider bandwidth channels than narrower bandwidth channels?
    • A. 

      True

    • B. 

      False

  • 16. 
    The bandwidth of a WCDMA signal is
    • A. 

      5 MHz

    • B. 

      1 MHz

    • C. 

      15 MHz

    • D. 

      10 MHz

  • 17. 
    The reasons for using OFDM in 4G systems are
    • A. 

      Better performance against time dispersion

    • B. 

      Better performance against frequency selectivity

    • C. 

      The design for an equalizer is easier for bandwidths larger than 5 MHz

    • D. 

      It can perform well even at the edge of a cell

  • 18. 
    One of the main reasons for using multi-carrier for transmitting high data rates is to avoid the frequency selectivity problem.
    • A. 

      True

    • B. 

      False

  • 19. 
    WCDMA/HSPA uses
    • A. 

      Multicarrier transmission

    • B. 

      One carrier transmission

Back to Top Back to top