What is the exact relation between symbol duration and frequency spacing?

You may know in WiFi6, about 11ax band, there are more sub-carriers compared to WiFi5 because of using shorter frequency spacing, but also uses a longer symbol duration. I guess there is some relation between them.


1 Answer 1


Subcarrier spacing is equal to the reciprocal of the symbol time.

Equalizing narrower channels flattens group delay error and improves noise margin at the expense of added DSP processing.

  • \$\begingroup\$ Thank you for your answer. you mean that added DSP processing needs more time to process, and it extends the symbol time? \$\endgroup\$
    – ssabassaba
    Jul 30, 2021 at 18:51
  • \$\begingroup\$ It does everything \$\endgroup\$ Jul 30, 2021 at 20:01
  • \$\begingroup\$ What do you mean everything? \$\endgroup\$
    – ssabassaba
    Aug 1, 2021 at 5:39
  • \$\begingroup\$ More processing does not cause extended symbol time, it is caused by narrower BW \$\endgroup\$ Aug 1, 2021 at 10:09
  • \$\begingroup\$ Thank you! my point is how are those two parameters reciprocal? \$\endgroup\$
    – ssabassaba
    Aug 1, 2021 at 12:34

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