(01: A) - The figure shown below is a quadrature amplitude modulation (QAM). Define QAM if, m₁ (t) = 2 coswm1(t) and m₂ (t) = 5 coswm2 (t), find a₁(t), a₂(t), Sc(t), x₁(t), x₂(t), y₁ (t) and y₂ (t). m₁ (²) DSB a(t) Icos 2 ct sc(t) QAM signal -90° sin 2 fet DSB a (t) Transmitter LPF + x ₁(t) y ₁(t) У -90° 2 cos 2* fc ! Local carrier 2 sin 2 fet LPE Receiver 7₂(!)

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Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.