Digital Communications Questions and Answers – Equalization

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 Answer

Answer: b
Explanation: To achieve ideal transmission characteristics, the signal’s bandwidth must be constant and the channel’s phase response must be a linear function of frequency.

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
View Answer

Answer: d
Explanation: When modulus of channel’s transfer function is not constant within W then amplitude distortion occurs.

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
View Answer

Answer: b
Explanation: When channels phase response is not a linear function of frequency within W then phase distortion occurs.
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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
View Answer

Answer: c
Explanation: Equalization process can be divided into two major categories called as maximum likelihood sequence estimator and equalizer with a filter.

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

Answer: a
Explanation: In maximum likelihood sequence estimator it measures the impulse response value and adjusts the receiver environment according to that of the transmitter.
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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
View Answer

Answer: c
Explanation: The filters used with equalizers can be linear devices that contain only feed forward elements or non linear devices with both feed forward and feed back elements.

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
View Answer

Answer: a
Explanation: Linear devices with only feed forward elements are called as transversal equalizers and non linear devices with both feed forward and feed back elements are called as decision feedback equalizers.
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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
View Answer

Answer: a
Explanation: Predetection samples are provided only on symbol boundaries. A condition in which only one sample per symbol are provided is called as symbol spaced and the condition in which multiple samples are provided per symbol is called as fractionally spaced.

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
View Answer

Answer: b
Explanation: An eye pattern is a display that results from measuring a system’s response to baseband signals in a prescribed way. The width of the opening gives the time over which the sampling for detection might be performed.
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10. Range of time difference of the zero crossing gives the value of
a) Width
b) Distortion
c) Timing jitter
d) Noise margin
View Answer

Answer: c
Explanation: The time difference of the zero crossing in the eye pattern gives the value of timing jitter.

Sanfoundry Global Education & Learning Series – Digital Communications.

To practice all areas of Digital Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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