Communication Engineering Systems 과제

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Consider the modulation and demodulation of an AM wave.

(a) Develop a Matlab script to simulate the modulation of a 20kHz carrier with a 0.4kHz modulation wave. Use a modulation index of 50 percent and a sampling rate of 160kHz.

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본문내용

Consider the modulation and demodulation of an AM wave.

(a) Develop a Matlab script to simulate the modulation of a 20kHz carrier with a 0.4kHz modulation wave. Use a modulation index of 50 percent and a sampling rate of 160kHz.
(b) An envelope detector is assumed to have a forward resistance rf of 25Ω and a capacitance of 0.01uF. The source resistance is 75Ω and the load resistance is 10kΩ
(c) The output of the envelope detector is applied to a unit-gain RC filter with time constant 1ms. Develop a discrete-time truncated impulse response model of this filter .Apply this filter model to the envelope detector output. Comment on the results.

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