a)Name the digital modulation schemes used to generate the waveforms drawn in (ii) and (iv) , and then draw the modulating data signals in (i) and (iii) corresponding to the waveforms in (ii) and (iv)...

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Extracted text: a)Name the digital modulation schemes used to generate the waveforms drawn in (ii) and (iv) , and then draw the modulating data signals in (i) and (iii) corresponding to the waveforms in (ii) and (iv) respectively: () Modulating data signal time > wwvimi (ii) | time > Modulating data signal I time - (iv) time > b) Explain what is meant by Coherent and Non- coherent demodulation