Basics Of Software Defined Radio Architectures And Building Blocks Of Sdr Waveform Development For Sdr

25 Questions | Total Attempts: 80

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Questions and Answers
  • 1. 
    What is the major drawback of Superheterodyne transceivers with respect to homodyne receivers?
    • A. 

      I/Q imbalance

    • B. 

      LO leakage

    • C. 

      DC Offset

    • D. 

      Difficult to integrate on-chip

  • 2. 
    The transmit frequency is kept higher to
    • A. 

      Be able to use smaller antenna size

    • B. 

      To send more information

    • C. 

      Both of above

    • D. 

      None of above

  • 3. 
    Which of the following is a drawback of Homodyne transceivers:
    • A. 

      I/Q imbalance component can be avoided by filtering.

    • B. 

           Large size as compared to other architectures.

    • C. 

      Difficult to integrate on-chip

    • D. 

      DC offset errors interefere with signal of interest.

  • 4. 
    Without using an IF frequncy, the desired signal is directly frequency downconverted to baseband / frequency up-converted to RF in
    • A. 

      Superheterodyne transmitter/ Superheterodyne receiver

    • B. 

      Superheterodyne receiver/ Superheterodyne transmitter

    • C. 

      Homodyne receiver/ Homodyne transmitter

    • D. 

      Homodyne transmitter/ Homodyne receiver

  • 5. 
    If measure SNR is around 98 dB in an ADC. What is bit-resolution of ADC ?
    • A. 

      16-bit

    • B. 

      10-bit

    • C. 

      12-bit

    • D. 

      8-bit

  • 6. 
    Which of the following is merit of out-of-band error
    • A. 

      NMSE

    • B. 

      ACPR

    • C. 

      EVM

    • D. 

      BER

  • 7. 
    Numerically Controlled Oscillators is used in
    • A. 

      Superheterodyne architecture

    • B. 

      Digital-IF based Homodyne architecture

    • C. 

      Homodyne architecture

    • D. 

      Dual-conversion superheterodyne architecture

  • 8. 
    Increase in fIF (IF frequency) in Superheterodyne transceivers is not related to
    • A. 

      Capability of filtering the image signal.

    • B. 

      Increase in constraint on DAC and ADC.

    • C. 

      Increase in clock jitter.

    • D. 

      Increase in I/Q imbalance component power

  • 9. 
    Digital-IF based Homodyne transmitter require
    • A. 

      Numerically Controlled Oscillators

    • B. 

      Two LOs

    • C. 

      Two bandpass filters.

    • D. 

      More than two LOs and Oscillators.

  • 10. 
    In an analog quadrature modulator, frequency of input data is 30 MHz and LO frequency is1.8 GHz. What would be frequency of output RF?
    • A. 

      1.8 GHz

    • B. 

      1.86 GHz

    • C. 

      1.83 GHz

    • D. 

      None of the above

  • 11. 
    This is not a benefit of oversampling:
    • A. 

      Improved bit-resolution of ADC

    • B. 

      Increase in SNR.

    • C. 

      Avoid aliasing

    • D. 

      Decrease in I/Q imbalance signal power.

  • 12. 
    Which of the following is not true regarding software-defined-radios
    • A. 

      Functions are digitally defined

    • B. 

      Reconfigurable

    • C. 

      No hardware is required at all

    • D. 

      Algorithms should be updated according to the digital platform

  • 13. 
    Pulse shaping is applied on the digitally modulated signal to
    • A. 

            Enhance signal quality

    • B. 

            Be able to send more information

    • C. 

      Contain the signal information in smaller bandwidth

    • D. 

      Remove the need for power amplifier

  • 14. 
    Which of the following are the limitations in achieving (completely digital) ideal software define radios
    • A. 

      Baseband Processing

    • B. 

      Local Oscillators, due to phase noise

    • C. 

      Sampling speed of A/D and D/A, which is sufficient to cover transmission frequency

    • D. 

      Data encoding which consumes digital resources

  • 15. 
    Please consider following sentences (i) Rectangular signal in time domain corresponds to a SINC signal in frequency domain. (ii) Rectangular signal in frequency domain corresponds to a SINC signal in time domain.
    • A. 

      Only (i) is true

    • B. 

      Only (ii) is true

    • C. 

      Both (i) and (ii) are wrong

    • D. 

       Both (i) and (ii) are correct

  • 16. 
    Select the correct statement
    • A. 

      SNR is lower than the SNDR

    • B. 

                  SINAD is lower than the SNDR

    • C. 

      SINAD is lower than the SNR

    • D. 

                 SNR is lower than the SINAD

  • 17. 
    Which of the following are most suitable for computation heavy applications
    • A. 

      Digital signal processor

    • B. 

      Graphics processing units

    • C. 

      General-purpose microprocessors

    • D. 

      Field programmable gate arrays

  • 18. 
    Highest frequency in the discrete domain is given by
    • A. 

      Angular frequency π, frequency 0.5.

    • B. 

      Angular frequency π, frequency 0.75.

    • C. 

      Angular frequency 4π, frequency 0.5.

    • D. 

      Angular frequency π, frequency 1.

  • 19. 
    We need to apply N- point DFT for 16382 samples, which of the following is the most suitable value of N to be implemented in a DSP
    • A. 

      16384

    • B. 

      10000

    • C. 

      15000

    • D. 

      16380

  • 20. 
    Applying windowing techniques in time domain waveform results in
    • A. 

      Broader main lobe

    • B. 

      Better attenuation of side lobes

    • C. 

      Less spectrum leakage

    • D. 

      All of the above

  • 21. 
    Under-sampling methods allow utilizing lower sampling rates than the highest frequency of the incoming signal for
    • A. 

      Pass-band signal

    • B. 

      Base-band signal

    • C. 

      Both of above

    • D. 

      None of above

  • 22. 
    For band-pass sampling
    • A. 

      Lower ADC bandwidth is required as compared to baseband sampling technique.

    • B. 

      The sampling rate of ADC is always higher than the baseband sampling technique.

    • C. 

      Both of above

    • D. 

      None of above

  • 23. 
    For measuring time domain performance and frequency domain performance respectively, we require
    • A. 

      Oscilloscope and Spectrum analyzer respectively.

    • B. 

      Spectrum analyzer and Oscilloscope respectively.

    • C. 

      Oscilloscope only.

    • D. 

      Spectrum analyzer only.

  • 24. 
    If the IF frequency in a transmitter is equal to 0 then the architecture of the transmitter is called
    • A. 

      Superheterodyne / Digital-IF

    • B. 

      Homodyne / Direct Conversion.

    • C. 

      Superheterodyne / Direct Conversion

    • D. 

      Homodyne / Digital-IF

  • 25. 
    What to do you understand by Digital IF
    • A. 

      IF Shift using analog component

    • B. 

      IF Shift in baseband 

    • C. 

      Both a and b

    • D. 

      None of the above.

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