Digital Communication Questions and Answers
Q1.
Rake receivers are used in
Answer :
1. Radio astronomy
2. CDMA
3. W-CDMA
Q2.
When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.
Answer :
Frequency non selective
Q3.
Coherence time is _______ to Doppler spread.
Answer :
Inversely proportional
Q4.
When transmitter and receiver moves towards each other, the magnitude of frequency shift is
Answer :
Positive
Q5.
Scintillation describes the fading caused by
Answer :
Physical changes
Q6.
Small scale fading occurs due to
Answer :
Doppler shift & Time delay
Q7.
Delta modulation is
Answer :
1 bit DPCM
Q8.
In early late timing error detection method if the bit is constant, then the slope will be
Answer :
Close to zero
Q9.
The probability density function of the envelope of narrow band noise is
Answer :
Gaussian
Q10.
Quantization is a _____ process.
Answer :
Many to few mapping
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