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Maybe I'm wrong here. Looks like bladeRF and USRP B200-series have the bandwidth, sample rate, and data speed to do 802.11b.

Maybe some radio smartperson can clarify?

The USRP B200 sales page actually says it can be used for WiFi. It also says "up to" 56MHz of bandwidth -- if that's actually available in the 2.4 and/or 5GHz bands, it should be able to implement 802.11n which uses 20 or 40MHz channels.

(802.11ac is out of bounds, its channels are 80MHz minimum.)

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