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The figure is the FDMA,and i know that FDMA is that dividing the bandwidth into many blocks(frequency band),i want to ask Is there just a carrier in each frequency band in FDMA?i mean one carrier for User1 ,one carrier for User2,and one carrier for User3,and so on.Or for the user N,there are lots of carrier in it,if i want to send a signal,then i have to use a carrier?

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That's undefined.

FDMA just says that different users use different parts of the spectrum.

What these users do within "their" frequency ranges is up to the system to define.

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  • $\begingroup$ So you mean how many carrier in one frequency band is up to the system or user? $\endgroup$
    – Shine Sun
    Aug 9, 2018 at 12:39
  • $\begingroup$ yes. That is what I wrote. $\endgroup$
    – Marcus Müller
    Aug 9, 2018 at 12:44

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