Constant Envelope Modulation

Wireless & Mobile Communications

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Constant Envelope Modulation”.

1. In non-linear modulation, the amplitude of the carrier varies with the variation of modulating signal.
a) True
b) False

2. In constant envelope family of modulation, class C amplifiers introduces degradation in spectrum occupancy.
a) True
b) False

3. Constant envelope modulation techniques occupy ______ bandwidth than linear modulation schemes.
a) Larger
b) Smaller
c) Same
d) Twice

4. In BFSK __________ of constant amplitude carrier signal is switched between two values.
a) Phase
b) Angle
c) Frequency
d) Amplitude

5. MSK stands for ________
a) Maximum shift keying
b) Minimum shift keying
c) Minimum space keying
d) Maximum space keying

6. What is the modulation index of MSK?
a) 0.1
b) 1
c) 0.5
d) 0

7. The modulation index of an FSK signal is similar to modulation index of ________
a) Amplitude modulation
b) Phase modulation
c) QPSK
d) Frequency modulation

8. The name minimum phase shift keying implies minimum _________
a) Frequency separation
b) Amplitude separation
c) Phase change
d) Amplitude deviation

9. MSK is sometimes also referred as _________
a) Slow FSK
b) Fast FSK
c) Slow PSK
d) Fast PSK

10. Which of the following is not a property of MSK?
a) Variable envelope
b) Spectral efficiency
c) Good BER performance
d) Self synchronizing capability

11. MSK is a special form of OQPSK.
a) True
b) False

12. GMSK is a ________ of MSK.
a) Integral
b) Opposite
c) Derivative
d) Similar

13. Which of the following holds true for GMSK?
a) Minimum ISI
b) Minimum error rate
c) Good spectral efficiency
d) Variable envelope property

14. MSK has complex demodulation and synchronization circuits.
a) True
b) False

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