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Wireless Communication Systems Practice Test: Modulation Techniques for Mobile Radio
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Modulation reduces the size of the antenna and attracts low attention.  Some modulation techniques for mobile radio are: Frequency modulation (FM): A popular analog modulation technique used in mobile communications systems. In FM, the amplitude of the modulating carrier is kept constant while its frequency is varied by the modulating message signal. Amplitude modulation (AM): A modulation technique that is used in electronic communication. It is most commonly used for transmitting messages with a radio carrier wave. Quadrature amplitude modulation (QAM): A form of modulation widely used... Show more
Wireless Communication Systems Practice Test: Modulation Techniques for Mobile Radio
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25 Questions

1. FM can improve the receiver performance through adjustment of transmitted power.
2. Which of the following is a drawback of FM systems?
3. A percentage of modulation greater than ___________ will distort the message signal.
4. MSK stands for ________
5. In angle modulation, signal to noise ratio before detection is a function of ______
6. Amplitude modulation has ______ relationship between the quality of the received signal and the power of the received signal.
7. GMSK is a ________ of MSK.
8. The power efficiency of the M ary PSK decreases because of the _____
9. By applying cos(2πft), BPSK signal is equivalent to ________
10. Which of the following is not a characteristic of PN sequence?
11. In linear modulation technique __________ of transmitted signal varies linearly with modulating digital signal.
12. Gaussian pulses are used when cost and power efficiency are major factors.
13. In frequency modulation, the amplitude of modulated carrier signal is ______and its frequency is ______ by the modulating message signal.
14. What is the full form of OQPSK?
15. FM signals are _____ susceptible to atmospheric and impulse noise as compared to AM.
16. An FM signal is a ______ envelope signal.
17. Intersymbol interference (ISI) leads to ________ probability of the receiver for making an error in detecting the symbols.
18. Carrier signal in modulation technique is _______ signal.
19. The constellation of M-ary PSK is ____________ dimensional.
20. FM has _______ noise immunity when compared to amplitude modulation.
21. In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is _____ and power efficiency is ________
22. Which of the following is a disadvantage of tone-in-band SSB system?
23. QPSK signals perform better than OQPSK in the presence of phase jitter.
24. AM signal have all information in ______ of the carrier.
25. Increasing the data rate implies the increase in pulse width of digital symbol.