Digital Communication Questions and Answers
Q1.
A rake receiver uses multiple
Answer :
Correlators
Q2.
If delay time is lesser than symbol time, ______ fading occurs.
Answer :
Frequency non selective & Flat
Q3.
When a user’s moving, the user’s velocity causes shift in frequency. This is called as
Answer :
Doppler shift
Q4.
The effect of Doppler shift can be counterattacked by
Answer :
1. OFDM
2. By using two receivers with separate antennas
3. By using diversity receiver
Q5.
The received power is attenuated by a factor called
Answer :
Path & Free space loss
Q6.
The parameters used to describe large scale fading are
Answer :
1. Reference distance
2. Path loss exponent
3. Standard deviation of random variable
Q7.
Prediction gain _____ for better prediction.
Answer :
Increases
Q8.
The low pass filter at the output end of delta modulator depends on
Answer :
Bandwidth
Q9.
The spectral density of white noise is
Answer :
Uniform
Q10.
Which is a quantization process?
Answer :
Rounding & Truncation
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