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I have noticed in some OFDM systems, some null subcarriers are added in frequency domain. What's the benefit of those zero subcarriers, and is that mandatory ?

An example I have read about that adding of zero subcarriers is here This paper

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    $\begingroup$ I believe the question has been addressed at dsp.stackexchange.com/a/40341/26081 $\endgroup$
    – AlexTP
    Oct 9, 2020 at 11:42
  • $\begingroup$ @AlexTP Thank you, Is inserting zero subcarriers mandatory in all cases ? or it's optional ? .. $\endgroup$
    – Fatima_Ali
    Oct 9, 2020 at 12:21
  • $\begingroup$ It depends on your criteria. For example as answered in the link, it is mandatory for device production cost savings. It can be optional if you don't care about causing interference to other channels and cost is not your concern. $\endgroup$
    – AlexTP
    Oct 9, 2020 at 12:28

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