Diversity Techniques

Wireless & Mobile Communications

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Diversity Techniques”.

1. Diversity requires a training sequence.
a) True
b) False

2. Diversity decisions are made by ____________
a) Receiver
b) Transmitter
c) Channel
d) Adaptive algorithms

3. Small scale fades are characterized by ____________ amplitude fluctuations.
a) Large
b) Small
c) Rapid
d) Slow

4. ____________ is used to prevent deep fade for rapidly varying channel.
a) Modulation
b) Demodulation
c) Macroscopic diversity technique
d) Microscopic diversity technique
.

5. Large scale fading can be mitigated with the help of _________
a) Modulation
b) Demodulation
c) Macroscopic diversity technique
d) Microscopic diversity technique

6. Space diversity s also known as ________
a) Antenna diversity
b) Time diversity
c) Frequency diversity
d) Polarization diversity

7. Which of the following is not a category of space diversity technique?
a) Selection diversity
b) Time diversity
c) Feedback diversity
d) Equal gain diversity

alse

8. In selection diversity, the gain of each diversity branch provides different SNR.
a) True
b) False

9. Polarization diversity uses the ________ as the diversity element.
a) Modulation index
b) Carrier frequency
c) Reflection coefficient
d) Coherence time

10. Which of the factor does not determine the correlation coefficient?
a) Polarization angle
b) Cross polarization discrimination
c) Offset angle from the main beam direction
d) Coherence time

11. Frequency diversity is implemented by transmitting information on more than one ___________
a) Carrier frequency
b) Amplitude
c) Phase
d) Modulation scheme

12. Frequency diversity uses ________ as a diversity element.
a) Correlation coefficient
b) Coherence time
c) Coherence bandwidth
d) SNR
.

13. Frequency diversity is good for low traffic conditions.
a) True
b) False

14. Time diversity repeatedly transmits information at time spacings that exceed ___________
a) Coherence bandwidth
b) Dwell time
c) Run time
d) Coherence time

15. In maximal ratio combining, the output SNR is equal to __________
a) Mean of all individual SNRs
b) Maximum of all SNRs
c) Sum of individual SNR
d) Minimum of all SNRs

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