3. From the following figure, answer the following questions.
(a) What is the modulation process shown in the figure?
Quadatic Amplitude Modulation (QAM)
(b) Explain clearly how it works.
- At the receiver side, the composite modulated signal will be mixed with two demodulating signals
(c) What is the main advantage of this modulation type?
- In a QAM, the composite carrier signal contains two orthogonal signals
- the number of bits of information that can be conveyed in a single symbol