How do I convert a sampled complex signal to a real signal?

1. What is the difference between real and complex signal?
2. What is the resultant signal called after it has been sampled?
3. Can a signal take complex value?

What is the difference between real and complex signal?

A real signal at any given time takes its value in the set of real numbers, and a complex signal takes its value in the set of complex numbers.

What is the resultant signal called after it has been sampled?

When the signal is converted back into a continuous time signal, it will exhibit a phenomenon called aliasing. Aliasing is the presence of unwanted components in the reconstructed signal. These components were not present when the original signal was sampled.

Can a signal take complex value?

While the domain set determines the arguments of the signal, the range set determines the values of it. Therefore a real valued signal is a function whose range set is the real numbers. Consequently a complex valued signal is the one whose range set is the complex numbers.