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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.
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.
