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I'm tried to find the solution, but I failed.

my question in the figure below, and the correct answer it's shown at the end of Figure. enter image description here

I'm using this formula but the answer is not correct! enter image description here Is there another solution to this question?

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Using the formula you would arrive at 5Rs. Pay attention to the spacing given in the formula and the spacing of your actual carriers. The 4-orthogonal FSK system is not at the minimum frequency separation; you could actually fit in 3 more carriers that would still be orthogonal and thus have the same bandwidth as a 7-orthogonal FSK system.

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  • $\begingroup$ Can you explain more, I don't quite understand what you mean? $\endgroup$ Jun 19 at 9:30
  • $\begingroup$ @Abdallah_98 Look at $\Delta F$ in the formula, and look at $\Delta F$ for the carriers you actually have. $\endgroup$ Jun 19 at 12:19

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