11ac on 2,4

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  • Updated 5 years ago
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What's the reason 256QAM was not implemented on 2,4 Ghz. Wider channels left aside, 2,4Ghz client could benefit from higher modulation schemes.

Steven
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steven

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Posted 5 years ago

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Ronald Esveld

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11ac is only on 5GHz as it was defined for that.
160Mhz channels (wave 2) are not possible on the 2.4GHz band.
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steven

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I known, but 2,4 might benefit from the higher modulation scheme only.
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Matthew Gast

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The higher modulation scheme only buys you an extra 33%, but it requires 5-7 dB higher performance. Given the somewhat higher noise floor in 2.4 GHz, that's a pretty high bar for a small return.

And you can't even begin to think about wider channels -- the 2.4 GHz band is only 83 MHz wide, so running an 80 MHz channel requires that the entire 2.4 GHz band be free. That just won't happen in the real world unless you're in an RF isolation chamber.