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I've been reading this summary(info.tek.com) of Wifi standards from Tektronix, which seems to do a pretty decent job of explaining things, but has left me with a couple of questions:

  • For access points that support multiple standards, how are the beacons transmitted? I would guess they use BPSK, but it's not clear whether this would be DSSS or OFDM (e.g. 802.11n devices don't support DSSS as far as I can see)
  • When both the access point and end device support multiple standards (b/g/n seems pretty common) how do they decide which standard to use? I guess they let other devices know what they support through broadcasts/probe requests, so do they just default to the one offering highest data rates?
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  • $\begingroup$ This question may be better suited for the electronics SE? $\endgroup$ – Gürkan Çetin Jun 28 '15 at 9:11

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