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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. Frequency demodulator is a frequency to amplitude converter circuit.
2. An FM signal is a ______ envelope signal.
3. Which of the following FM demodulator is sometimes known as pulse averaging discriminator?
4. _______ is equal to width of main spectral lobe.
5. The transmission bandwidth of spread spectrum techniques is equal to the minimum required signal bandwidth.
6. M-ary signalling techniques are not sensitive to timing jitters.
7. Single sideband AM systems occupy same bandwidth as of conventional AM systems.
8. As the value of M _________ the bandwidth efficiency ________
9. QPSK provides twice the bandwidth efficiency and _______ energy efficiency as compared to BPSK.
10. Which of the following is a drawback of FM systems?
11. Frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is differentiated before modulation.
12. Intersymbol interference (ISI) leads to ________ probability of the receiver for making an error in detecting the symbols.
13. Frequency modulation index defines the relationship between the ______ and bandwidth of transmitted signal.
14. The performance of modulation scheme is not measured in terms of __________
15. Which of the following is true for a Gaussian filter?
16. Gaussian pulses are used when cost and power efficiency are major factors.
17. Which of the following holds true for GMSK?
18. Power efficiency of M-ary FSK increases, since _________
19. Which of the following is not a linear modulation technique?
20. FM is called constant envelope because ______ of carrier wave is kept constant.
21. The name minimum phase shift keying implies minimum _________
22. According to Nyquist, the impulse response of the overall communication system should have ______ decay with _______ magnitude for sample values not equal to zero.
23. The modulation index of an FSK signal is similar to modulation index of ________
24. QPSK has ________ the bandwidth efficiency of BPSK.
25. AM signal have all information in ______ of the carrier.