Rake Receivers

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Diversity technique and rake receivers”.

1. The technique for combining diversity signals are
a) Feedback
b) Maximal ratio
c) Equal gain
d) All of the mentioned

2. Diversity technique is used for combating
a) Fading
b) Error bursts
c) Co-channel interference
d) All of the mentioned

3. Diversity technique is applied at
a) Base station
b) Mobile receiver
c) Base station & Mobile receiver
d) None of the mentioned

4. Which is more effective and commonly preferred technique?
a) Time diversity
b) Spatial diversity
c) Frequency diversity
d) None of the mentioned

5. Diversity technique
a) Provides significant link improvement
b) Needs training overhead
c) All of the mentioned
d) None of the mentioned

6. What are the modes of adaptive equalizer?
a) Training mode
b) Tracking mode
c) Training & Tracking mode
d) None of the mentioned

7. Which signalling scheme is preferred for fading channel?
a) Frequency based modulation
b) Phase based modulation
c) Frequency & Phase based modulation
d) None of the mentioned

8. Uncorrelated fading occurs when
a) Time span is small
b) Time span is large
c) Does not depend on time span
d) None of the mentioned

9. Interleaving does
a) Forward error correction
b) Backward error correction
c) Forward & Backward error correction
d) None of the mentioned

10. Rake receiver does
a) Counter effects multi-path fading
b) Resembles equalizer
c) Resembles equalizer & Counter effects multi-path fading
d) None of the mentioned

11. Information reliability depends on
a) Magnitude of each component
b) Time of arrival of each component
c) Magnitude & Time of arrival of each component
d) None of the mentioned

12. A rake receiver uses multiple
a) Delay circuits
b) Correlators
c) Detectors
d) None of the mentioned

13. Rake receivers are used in
a) Radio astronomy
b) CDMA
c) W-CDMA
d) All of the mentioned

14. The rake receivers functions are similar to
a) Equalizer
b) Matched filter
c) Equalizer & Matched filter
d) None of the mentioned

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