During beamforming, the Tx first sends NDP Announcement (which is a broadcast frame) thereby reaching all Rx in its area. And then it follows by sending NDP.

  1. Is the 2nd frame (NDP) is also a broadcast frame?
  2. What happens if Tx wants to implement beamform with a specific Rx.
  • $\begingroup$ Hi! What standard are you referring to? What does NDP stand for? $\endgroup$ – Marcus Müller Feb 20 '18 at 10:03
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    $\begingroup$ I am guessing that OP is talking about Null Data Packet in 802.11ac. Have a Survival Guide. $\endgroup$ – jojek Feb 20 '18 at 11:11
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    $\begingroup$ Yes, NDP (Null Data Packet) 802.11n/ac std. It is used for beamforming $\endgroup$ – Nusrat Feb 20 '18 at 17:13

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