Digital Communication Questions and Answers
Q1.
The relation between the probability of bit error and probability of symbol error in M-ary orthogonal signalling is
Answer :
(M/2)/M-1
Q2.
In differential PSK the date is
Answer :
Encoded differentially
Q3.
In differential encoding the _________ different between two wave forms is measured.
Answer :
Phase
Q4.
The real part of a sinusoid carrier wave is called as
Answer :
Inphase
Q5.
The term heterodyning refers to
Answer :
Frequency conversion & mixing
Q6.
The space window region ranges from
Answer :
1GHz to 10 GHz
Q7.
In which repeaters uplink is decoupled from the downlink?
Answer :
Regenerative
Q8.
The beam-width becomes narrower on
Answer :
Increasing frequency & antenna size
Q9.
Visibility is ________ to required availability.
Answer :
Inversely proportional
Q10.
Automatic repeat request is also called as
Answer :
Backward error correction
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