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When calculating the maximum number of users, limiting factor in FDM is ___________

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When calculating the maximum number of users, limiting factor in FDM is ___________

(a) bandwidth of each signal

(b) type of each signal

(c) amplitude of each signal

(d) length of the channel

I got this question in an internship interview.

Question is from Reactance Modulator topic in section Angle Modulation of Analog Communications

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The correct option is (a) bandwidth of each signal

To explain I would say: When calculating the maximum users in frequency division multiplexing, the bandwidth of each transmitting signal must be observed very carefully and thus it is also the limiting factor in FDM.

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