Digital Communication Questions and Answers
Q1.
Which is the main system consideration?
Answer :
1. Probability of error
2. System complexity
3. Random fading channel
Q2.
The maximum likelihood sequence estimator adjusts _____ according to _____ environment.
Answer :
Receiver, transmitter
Q3.
Range of time difference of the zero crossing gives the value of
Answer :
Timing jitter
Q4.
An error in binary decision making occurs when the channel noise is
Answer :
Greater or Lesser than the optimum threshold level
Q5.
Example for antipodal bandpass signaling is
Answer :
BPSK
Q6.
Examples of nyquist filters are
Answer :
Root raised & Raised cosine filter
Q7.
Examples of double side band signals are
Answer :
ASK & PSK
Q8.
Which are called as hard decisions?
Answer :
Estimates of message symbol without error correcting codes
Q9.
The channel may be affected by
Answer :
Thermal noise & Interference from other signals
Q10.
In which system, bit stream is portioned into even and odd stream?
Answer :
QPSK
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