Why would we simulate baseband rather than passband

1. Why is baseband needed?
2. What is the difference between baseband and passband?
3. What are the advantages of passband transmission over baseband transmission?
4. Why is baseband not practical for radio communication?

Why is baseband needed?

A signal at baseband is often used to modulate a higher frequency carrier signal in order that it may be transmitted via radio. Modulation results in shifting the signal up to much higher frequencies (radio frequencies, or RF) than it originally spanned.

What is the difference between baseband and passband?

Baseband transmission is transmission of the encoded signal using its own baseband frequencies i.e. without any shift to higher frequency ranges. Passband transmission is the transmission after shifting the baseband frequencies to some higher frequency range using modulation.

What are the advantages of passband transmission over baseband transmission?

Passband digital transmission allows more efficient use of the allocated RF bandwidth, and flexibility in accommodating different baseband signal formats.

Why is baseband not practical for radio communication?

But a baseband signal cannot be transmitted over a radio link or a satellite because this would require a large antenna to radiate the low-frequency spectrum of the signal.