An amplitude-modulated signal 6AM (t) = A.[1+ m(t)] cos (@.1 + 0), where m(t) is the...

 

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An amplitude-modulated signal 6AM (t) = A.[1+ m(t)] cos (@.1 + 0), where m(t) is the message signal to be demodulated with the DSC-SC synchronous demodulator of Figure 3.12(a). The local carrier at the demodulator has both a frequency error and a phase error and is given by c(t) = cos [(m. + A@)t + a]. (a) Obtain an expression for the output of the demodulator. (b) What is the demodulator output if the frequency error is zero? (c) What is the demodulator output if the phase error is zero? (a) ODSB (1) = m1) cos at cos An amplitude-modulated signal 6AM (t) = A.[1+ m(t)] cos (@.1 + 0), where m(t) is the message signal to be demodulated with the DSC-SC synchronous demodulator of Figure 3.12(a). The local carrier at the demodulator has both a frequency error and a phase error and is given by c(t) = cos [(m. + A@)t + a]. (a) Obtain an expression for the output of the demodulator. (b) What is the demodulator output if the frequency error is zero? (c) What is the demodulator output if the phase error is zero? (a) ODSB (1) = m1) cos at cos