Digital Communication Questions and Answers
Q1.
The error performance of MPSK ______ as M or k increases.
Answer :
Decreases
Q2.
As limit of k increases, the ratio of PB/PE becomes
Answer :
1:2
Q3.
Envelope detector consists of
Answer :
Rectifier and low pass filter
Q4.
The error probability of DPSK is ________ worse than PSK.
Answer :
Twice (3db)
Q5.
Antipodal signal sets are those vectors that can be illustrated as
Answer :
Two 180 opposing vector
Q6.
The transformation of the waveform into a single point in signal space is called as
Answer :
Predetection point
Q7.
Atmospheric window region is used for
Answer :
Satellite & Deep-space communication
Q8.
AM-to-AM conversion brings about
Answer :
Amplitude variation
Q9.
Path loss Ls is dependent on
Answer :
Wavelength
Q10.
The stop and wait ARQ needs _______ connection.
Answer :
Half duplex
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