Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Equalization “.

1. Channel’s phase response must be a linear function of
a) Time
b) Frequency
c) Time & Frequency
d) None of the mentioned
View AnswerAnswer: b

2. Amplitude distortion occurs when
a) Impulse response is not constant
b) Impulse response is constant
c) Frequency transfer function is constant
d) Frequency transfer function is not constant

3. Phase distortion occurs when
a) Phase response is function of frequency
b) Phase response is not a function of frequency
c) All of the mentioned
d) None of the mentioned

4. Equalization process includes
a) Maximum likelihood sequence estimation
b) Equalization with filters
c) Maximum likelihood sequence estimation & Equalization with filters
d) None of the mentioned

5. The maximum likelihood sequence estimator adjusts _______ according to _____ environment.
a) Receiver, transmitter
b) Transmitter, receiver
c) Receiver, receiver
d) None of the mentioned

6. The filters used with the equalizer is of ______ types.
a) Feed forward
b) Feed backward
c) Feed forward and feedback
d) None of the mentioned

7. Transversal equalizers are ________ and decision feedback equalizers are ______
a) Feed forward, feed back
b) Feed back, feed forward
c) Feed forward, feed forward
d) Feedback, feedback

8. Symbol spaced has ____ sample per symbol and fractionally spaced has ___ samples per symbol.
a) One, many
b) Many, one
c) One, one
d) Many, many

9. The _______ of the opening of eye pattern indicates the time over which the sampling for detection might be performed.
a) Length
b) Width
c) X-axis value
d) Y-axis value

10. Range of time difference of the zero crossing gives the value of
a) Width
b) Distortion
c) Timing jitter
d) Noise margin

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