Digital Communication Questions and Answers
Q1.
Information reliability depends on
Answer :
Magnitude & Time of arrival of each component
Q2.
If delay time is greater than symbol time, _______ fading occurs.
Answer :
Frequency selective
Q3.
Minimum time required for magnitude change or phase change is called as
Answer :
Coherence time
Q4.
Flat fading can be avoided or stopped by
Answer :
1. Error coding
2. Equalization
3. Adaptive bit loading
Q5.
What is the source for performance degradation?
Answer :
1. Thermal noise
2. Man made noise
3. Natural noise
Q6.
Small scale fading manifests due to
Answer :
Signal dispersion & Time variant behavior
Q7.
The SNR value can be increased by _____ the number of levels.
Answer :
Increasing
Q8.
Which helps in maintaining the step size?
Answer :
Adaptive delta modulation
Q9.
Vector quantization is used in
Answer :
Speech coding
Q10.
Spread spectrum is used for
Answer :
Encrypting & Hiding signal
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