" Modulation is a process in which one parameter of a signal is varied according to a parameter of another signal "
Modulation is used to reduce the size of antenna , because the length of the antenna is the one forth of the wavelength,
In Communication system there are many type of modulation , in analog communication there are three type of modulation:
1.) Amplitude Modulation
2.)Frequency Modulation
3.) Phase Modulation
