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Suppose we have two OFDM based systems A & B.

  • System A has $N$ subcarriers and bandwidth $W$, and the number of samples in the CP is 10% of $N$.
  • System B has $2N$ subcarriers, $2W$ bandwidth and the number of samples in the CP is 5% of $2N$.

Which system has higher capacity?

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    $\begingroup$ Guessing this is some sort of homework question, have you tried answering it yourself first? If so, you should post where you are in your reasoning at least. $\endgroup$
    – Jdip
    Commented Aug 14, 2022 at 15:22
  • $\begingroup$ Does this answer your question? Does the data rate of ofdm depends on number of subcarriers $\endgroup$ Commented Aug 15, 2022 at 14:06
  • $\begingroup$ (my answer there addresses all the aspects in your homework/exam problem: changing number of subcarriers, changing procentual length of CP, bandwidth) $\endgroup$ Commented Aug 15, 2022 at 14:08
  • $\begingroup$ Can be solved the above questions by using data rate= bandwidth * spectral efficiency ? $\endgroup$
    – Ravindra
    Commented Aug 16, 2022 at 5:06
  • $\begingroup$ The question is actually from an interview. $\endgroup$
    – Ravindra
    Commented Aug 16, 2022 at 5:11

1 Answer 1

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The capacity of $A$ is $W\log_2(1+\text{snr})/1.1/NW$

The capacity of $B$ is $2W\log_2(1+\text{snr}/2)/1.05/NW$

So the capacity of $B$ is larger than that of $A$.

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