通信原理练习题03.docx-综合文档
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Chapter3
1. Comparison of AM, DSB, SSB and FM these four communication system,
which has the best efficiency? Which has the best reliability? Which have the
same efficiency?
2. What is the requirement on the characteristics of the filter for producing the
VSB signal?
3. What kind of baseband signal is suitable for VSB modulation?
4. Let the expression of a FM modulated signal be
10 cos
(
2 π × 10
6
t+5 sin 10
3
πt
)
Find: (1) the maximum frequency deviation of the modulated signal.
(2) the frequency of the carrier.
(3) the bandwidth and the average power of the modulated signal.
(4) if the FM circuit constant is
k
f
=5
kHz/V, then the expression of the baseband
signal can be written as:
5. Assume the amplitude of a FM modulated signal is 10V, the instantaneous
frequency of the FM signal is:
f
(
t
)
=10
6
+10
4
cos
(
2 π × 10
3
t
)
(Hz)
Find: (1) the expression of the FM modulated signal.
(2) the maximum frequency deviation , the modulation index, and the bandwidth
of the modulated signal.
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