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Why sub carrier spacing is more for wifi than lte

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Why sub carrier spacing is more for wifi than lte
posted Feb 29, 2016 by Shyam Narayan

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1 Answer

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I thinks it is because of orthogonal frequency usages in LTE which make sure at any point of time only one sub-carrier can be at peak. Which minimizes the sub-carrier frequency interference.
Let others comment if anyone has some extra information.

answer Feb 29, 2016 by Salil Agrawal
In LTE , cellular signal coverage is more, so more delay spread-> More ISI-> More freq selective fading due to less coherence BW. Coherence BW is inversely proportional to delay spread.  
To make channel freq flat channel, sub-carrier BW must be less than coherence BW

In wifi , delay spread is less due to less area coverage
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