Fading and Decision Theory Effects

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Effects of fading and decision theory”.

1. Fading channel has memory.
a) True
b) False

2. How can frequency selective distortion be minimized?
a) By using pilot signal
b) By adaptive equalization
c) By spread spectrum
d) All of the mentioned

3. How can slow fading be minimized?
a) By diversity technique
b) Error correcting codes
c) By diversity technique & Error correcting codes
d) None of the mentioned

4. Fast fading can be minimized by
a) Robust modulation
b) Coding and interleaving
c) Robust modulation, Coding and interleaving
d) None of the mentioned

5. The decision feedback equalizer has a linear traversal filter which is
a) Feed forward section
b) Feedback section
c) Feed forward section & Feedback section
d) None of the mentioned

6. The ISI and adjacent channel interference is removed by
a) Cancelling filter
b) Port processing equalizer
c) Cancelling filter & Port processing equalizer
d) None of the mentioned

7. The inter-leaver is more effective if the vehicle is
a) Fast
b) Slow
c) Fast & Slow
d) None of the mentioned

8. Channel noise is
a) Additive
b) White and stationary
c) Has infinite bandwidth
d) All of the mentioned

9. Which noise component plays a role in decision making?
a) Relevant noise
b) Non relevant noise
c) Relevant & Non relevant noise
d) None of the mentioned

10. Decision making needs
a) Priors
b) Likelihoods
c) Priors & Likelihoods
d) None of the mentioned

11. In matched filter _______ is performed.
a) Convolution
b) Correlation
c) Convolution & Correlation
d) None of the mentioned

12. Which needs more signal power?
a) BPSK
b) 16-QAM
c) BPSK & 16-QAM
d) None of the mentioned

13. Which has higher transmission rate?
a) BPSK
b) 16-QAM
c) BPSK & 16-QAM
d) None of the mentioned

14. Symbol error probability can also be determined using upper bound.
a) True
b) False

15. Which signal sets are called as equivalent signal sets?
a) Simplex
b) Bi-orthogonal
c) Simplex & Bi-orthogonal
d) None of the mentioned

16. For neyman pearson decision criterion, which are important?
a) Probability of false alarm
b) Probability of miss
c) Probability of false alarm & miss
d) None of the mentioned

17. What are the parameters calculated for an estimator?
a) Error
b) Mean square error
c) Variance
d) All of the mentioned

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