How to analyze multiple amplitude modulated signals?

1. What are the methods of measuring modulation index of AM?
2. How do you find the amplitude of a modulating signal?
3. What is the major limitation of AM method?

What are the methods of measuring modulation index of AM?

In AM schemes, the modulation index refers to the amplitude ratio of the modulating signal to the carrier signal. With the help of Fast-Fourier-Transforms (FFT), the modulation index can be obtained by measuring the sideband amplitude and the carrier amplitude.

How do you find the amplitude of a modulating signal?

Let Amax and Amin be the maximum and minimum amplitudes of the modulated wave. We will get the maximum amplitude of the modulated wave, when cos(2πfmt) is 1. We will get the minimum amplitude of the modulated wave, when cos(2πfmt) is -1.

What is the major limitation of AM method?

Amplitude modulation systems are susceptible to noise generation. This deteriorates the quality of the original signal at the receiving end and causes problems in the quality of the signal. This limits the applications of Amplitude Modulation to Radios, VHF, and systems used for one to one communications only.