1d bewollt 101 Figure P4.3-3 SAM (t)=2[b+0.5m(t)]cos wcl (a) Determine the average power in SAM (t) as a function of b and A. (b) If b = A, determine the modulation index and the modulation power efficiency. (c) Find the minimum value of b such that the AM signal can still be demodulated via envelope detection. Determine maximum modulation index and maximum modulation power efficiency based on the resulting b. 4.3-3 Repeat Prob. 4.3-1 for the message signal m(t) shown in Fig. P4.3-3. m(1) A- MMM. AA -0.05 0.05 -A++

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Repeat prob. 4.3-2 for the message signal m(t) given in Fig. P4.3-3.

Figure P4.3-3
4.3-2 In an amplitude modulation system, the message signal is given by Fig. P4.3-1 and the carrier
frequency is 1 kHz. The modulator output is
SAM (t) = 2[b+0.5m(t)] cos wet
won Bylis
(a) Determine the average power in SAM (t) as a function of b and A.
(b) If b = A, determine the modulation index and the modulation power efficiency.
(c) Find the minimum value of b such that the AM signal can still be demodulated via
envelope detection. Determine maximum modulation index and maximum modulation
power efficiency based on the resulting b.
4.3-3 Repeat Prob. 4.3-1 for the message signal m(t) shown in Fig. P4.3-3.
m(t)
MATAA
-0.05 10 0.05
-A-+
t
Transcribed Image Text:Figure P4.3-3 4.3-2 In an amplitude modulation system, the message signal is given by Fig. P4.3-1 and the carrier frequency is 1 kHz. The modulator output is SAM (t) = 2[b+0.5m(t)] cos wet won Bylis (a) Determine the average power in SAM (t) as a function of b and A. (b) If b = A, determine the modulation index and the modulation power efficiency. (c) Find the minimum value of b such that the AM signal can still be demodulated via envelope detection. Determine maximum modulation index and maximum modulation power efficiency based on the resulting b. 4.3-3 Repeat Prob. 4.3-1 for the message signal m(t) shown in Fig. P4.3-3. m(t) MATAA -0.05 10 0.05 -A-+ t
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