For what it's worth, in digital communications, OFDM you could say "is designed ...

wg-throw-away on Dec 30, 2021 | parent | context | favorite | on: Why can’t you design noise in frequency space?

For what it's worth, in digital communications, OFDM you could say "is designed in frequency space" and then passed through a FFT/IFFT and the output time-domain signal is what is sent over the air.