June 12, 2021

Intersymbol Interference – 2 MCQ’s

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This set of Digital Communications Systems Multiple Choice Questions & Answers (MCQs) focuses on “Intersymbol Interference – 2″.

1. Optimum threshold value is given by
a) a0+a1/2
b) a0-a1/2
c) a0/2
d) a1/2

2. The impulse response of the filter is the ________ of the mirror image of the signal waveform.
a) Delayed version
b) Same version
c) Delayed & Same version
d) None of the mentioned

3. According to the rule of minimizing the error probabilities, the hypothesis should be like if the priori probabilities are ________ than the ratio of likelihoods.
a) Lesser
b) Greater
c) Equal
d) None of the mentioned

4. The detector that minimizes the error probability is called as
a) Maximum likelihood detector
b) Minimum likelihood detector
c) Maximum & Minimum likelihood detector
d) None of the mentioned

5. The symbol of the probability under the tail of Gaussian pdf is called as
a) Complementary error function
b) Co error function
c) Complementary error & Co error function
d) None of the mentioned

6. An error in binary decision making occurs when the channel noise is
a) Greater than the optimum threshold level
b) Lesser than the optimum threshold level
c) Greater or Lesser than the optimum threshold level
d) None of the mentioned

7. Example of antipodal bandpass signaling is
a) BPSK
b) ASK
c) FSK
d) MSK

8. Matched filter provides _____ signal to noise ratio.
a) Maximum
b) Minimum
c) Zero
d) Infinity

9. The likelihood ratio test is done between
a) Likelihood of s1 by likelihood of s2
b) Likelihood of s2 by likelihood of s1
c) Likelihood of s1 by likelihood of s1
d) None of the mentioned

10. For an M-ary signal or symbol the number of likelihood functions are
a) M
b) M+1
c) M-1
d) 2M

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