advantages and disadvantages of frquency division multiplexing?

Answer 1

You need distance between the freqs. even then you'll get signals stepping on each other, as signal strength causes bleed over.
Usually (in my long ago SatComm experince) you need enough distance between the freqs to get the signal 3dB below the noise floor (or into the grass as we put it, on a green spec an) where they join.
Code Division muxing is much better. Or spred spec even better

I'm allmuxedup on most boards

Answer 2

Type frequency division multiplexing at yahoo search related URLs
are found , Find which best explains your question.