Why is SC-FDMA called "Single Carrier"?

Explains the relationship between SC-FDMA, OFDMA and FDMA in digital mobile communication systems.

Note that I should have drawn the sub-carrier/sub-channel side lobes having zeros under the peaks of the neighbouring sub-carriers/sub-channels. I was a bit too representational/simplistic in my drawings. The reason I don't pay too much attention to the zero-crossings in the frequency domain, is because they are not actually "the reason" the sub-channels are orthogonal (although many people believe it is). More details on why the sub-carriers are orthogonal can be found here: "Orthogonal Basis Functions in the Fourier Transform"    • Orthogonal Basis Functions in the Fou...  

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