Digital Communication Questions and Answers
Q1.
Coherent PSK and non coherent orthogonal FSK have a difference of _____ in PB.
Answer :
4db
Q2.
Phase distortion occurs when
Answer :
Phase response is not a function of frequency
Q3.
Symbol spaced has ____ sample per symbol and fractionally spaced has ___ samples per symbol.
Answer :
One, many
Q4.
The detector that minimizes the error probability is called as
Answer :
Maximum likelihood detector
Q5.
Matched filter provides _____ signal to noise ratio.
Answer :
Maximum
Q6.
What is symbol rate packing?
Answer :
Maximum possible symbol transmission rate
Q7.
Which value of r (roll off factor) is considered as Nyquist minimum bandwidth case?
Answer :
0
Q8.
Thermal noise in the communication system due to thermal electrons
Answer :
Cannot be eliminated
Q9.
The sample from the demodulation process consists of sample which is ______ to energy of the received symbol and _____ to noise.
Answer :
Directly and inversely proportional
Q10.
M-ary signalling produces _____ error performance with orthogonal signalling and _____ error performance with multiple phase signalling.
Answer :
Improved, degraded
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