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Modulation is the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal, with the amplitude of low-frequence modulating signal which typically contains information to be transmitted.

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What is symbol in signal processing?

I came across this statement: "Assuming the signal modulation $\mathfrak{M}$ has an alphabet A of M symbols and the symbol $A_{m}$ having the equal probability to be transmitted". … Can anyone help me understand this with any modulation example? …
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