i) ii): Draw the complete hierarchy of modulation schemes used in communication systems. iii) iv) If...

 

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i) ii): Draw the complete hierarchy of modulation schemes used in communication systems. iii) iv) If the bandwidth of a telephone channel is 4KHz and SNR is 20dB. Calculate the channel capacity. v) Briefly explain synchronous detection or coherent detection and which type of modulated signals can be demodulated using this type of de-modulation. If A is the amplitude of the carrier signal, what are the effects of the value of A in the de-Modulation of a pure AM signal? Briefly explain by sketching the AM envelop for different values of A. How AM modulators (except the multipliers) can be used as de-Modulators, briefly explain with some example. i) ii): Draw the complete hierarchy of modulation schemes used in communication systems. iii) iv) If the bandwidth of a telephone channel is 4KHz and SNR is 20dB. Calculate the channel capacity. v) Briefly explain synchronous detection or coherent detection and which type of modulated signals can be demodulated using this type of de-modulation. If A is the amplitude of the carrier signal, what are the effects of the value of A in the de-Modulation of a pure AM signal? Briefly explain by sketching the AM envelop for different values of A. How AM modulators (except the multipliers) can be used as de-Modulators, briefly explain with some example.

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