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enter image description here

This diagram again. This is clearly not the shape of $\log_2(1+SNR)$ but I very frequently see this instead of this:

enter image description here

But this is also a stupid diagram because it doesn't cross at the origin.

Also why do the modulation techniques veer away from $\log_2(1+SNR)$, they should stay on the curve and then get suddenly capped at their spectral efficiencies.

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    $\begingroup$ The upper graph clearly IS the shape of $log_2(1+SNR)$. Why do you think it's not ? $\endgroup$ – Hilmar May 24 at 12:27
  • $\begingroup$ @Hilmar imgur.com/a/DLHhKPb because that's the shape $\endgroup$ – Lewis Kelsey May 24 at 12:32
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    $\begingroup$ @LewisKelsey the question was why do you think it's not? Seriously, insert the definition of dB into log(1+SNR), and come to your own conclusions, instead of citing other pictures! $\endgroup$ – Marcus Müller May 24 at 12:56
  • $\begingroup$ @MarcusMüller well actually I typed that in desmos to illustrate what I was expecting, so that's my picture, but that's it, dB is logarithmic which I forgot about, thanks for the reminder. This is the answer $\endgroup$ – Lewis Kelsey May 24 at 13:06
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    $\begingroup$ Morale of the story: read the axis labels! $\endgroup$ – Hilmar May 24 at 13:38

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