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Digital Communications
Digital Communications
Modulation Techniques
Question 1
Marks :
+2
|
-2
Pass Ratio :
100%
If we correlate the received signal with both orthogonal function the inner product will be
In phase
Quadrature
In phase and quadrature
Unity
Explanation:
If we correlate the received signal with both the orthogonal function, the two inner products obtained will be in phase and quadrature.
Question 2
Marks :
+2
|
-2
Pass Ratio :
100%
Simulation is used to determine
Bit error rate
Symbol error rate
Bit error
Symbol error
Explanation:
A simulation of digital communication system is used to estimate bit error rate.
Question 3
Marks :
+2
|
-2
Pass Ratio :
100%
Every frequency has ____ orthogonal functions.
One
Two
Four
Six
Explanation:
Every frequency has two orthogonal functions – sine and cosine.
Question 4
Marks :
+2
|
-2
Pass Ratio :
100%
Matched filter is a _____ technique.
Modulation
Demodulation
Modulation & Demodulation
None of the mentioned
Explanation:
Matched filter is a demodulation technique with LTI.
Question 5
Marks :
+2
|
-2
Pass Ratio :
100%
Average energy per bit is given by
average energy symbol/log2 M
average energy symbol * log2 M
log2 M/ Average energy symbol
none of the mentioned
Explanation:
Average energy per bit is given by average energy symbol divided by log2 M.
Question 6
Marks :
+2
|
-2
Pass Ratio :
100%
FSK reception uses
Correlation receiver
PLL
Correlation receiver & PLL
None of the mentioned
Explanation:
Frequency shift keying uses correlation receiver and phase locked loop.
Question 7
Marks :
+2
|
-2
Pass Ratio :
100%
FSK reception is
Phase Coherent
Phase non coherent
Phase Coherent & non coherent
None of the mentioned
Explanation:
Reception of FSK can be either phase coherent or phase non coherent.
Question 8
Marks :
+2
|
-2
Pass Ratio :
100%
If we correlate the received signal with any one of the two orthogonal function, the obtained inner product will be
In phase
Quadrature
Zero
Cannot be determined
Explanation:
If we correlate the received signal with only one of the orthogonal function for example sine, the inner product obtained will be zero.
Question 9
Marks :
+2
|
-2
Pass Ratio :
100%
In non coherent reception _____ is measured.
Phase
Energy
Power
None of the mentioned
Explanation:
In non coherent reception of FSK, energy in each frequency is measured.
Question 10
Marks :
+2
|
-2
Pass Ratio :
100%
Which FSK has no phase discontinuity?
Continuous FSK
Discrete FSK
Uniform FSK
None of the mentioned
Explanation:
Continuous frequency shift keying has no phase discontinuity between symbols.
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10
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