(d) Software Defined Radio (SDR) allows agile tuning / demodulation for mobile and wireless receivers. (i) Assuming the

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(d) Software Defined Radio (SDR) allows agile tuning /
demodulation for mobile and wireless receivers. (i) Assuming the
availability of a 120MHz ADC, draw the main signal processing
components of a QAM based architecture of an IF (intermediate
frequency) SDR receiver (you do not require to show
timing/synchronisation). Assume your band of interest is over the
range 200MHz to 600MHz and of bandwidth 5MHz. Ensure you label your
diagram and write short notes on each of the main components. (4
marks) (ii) Assuming the availability of a 4GHz ADC, draw an
equivalent architecture for a zero-IF SDR receiver and add short
notes on components not already shown in part d(i). Over what
frequency bands could this SDR tune? (4 marks) (iii) Review any
advantages of the zero-IF receiver over that of the IF receiver. (2
marks) (e) Discuss why a zero-IF SDR would be appropriate for
design of a DSA TVWS receiver.