Digital Communication Questions and Answers
Q1.
Which refers to the presence of error correction coding scheme?
Answer :
Coded
Q2.
Code’s redundancy is given as
Answer :
n/k
Q3.
Channelization characterized by orthogonal spectra is called as
Answer :
Frequency division multiplexing
Q4.
QPSK is a composite of
Answer :
Two BPSK
Q5.
Which modulation is the most efficient one?
Answer :
QAM
Q6.
Which modulation has lower side lobe levels?
Answer :
MSK
Q7.
QAM is a combination of
Answer :
ASK and PSK
Q8.
When phase noise and phase jitter is doubled, the phase variance increases by
Answer :
Four times
Q9.
Continuous phase modulation has
Answer :
More bandwidth efficiency & smoothness
Q10.
Non coherent system requires
Answer :
Phase & Frequency synchronization
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