HE beamformed the the case of transmissions come with BEAM_CHANGE = 0. a "smoothing" or "beamformed" indication Smoothing or not is a in the preamble, so the receiver’s decision, it is receiver can adjust. This not related to is not possible if BF is BEAM_CHANGE. The applied from the start of receiver checks if the the packet. Since the channel can be receiver can not know smoothed or not. Even whether BF is applied or for beamformed frames, not, it may have no choice sometimes it can be but to disable channel smoothed. For 11ax, smoothing. This would be even beamformed quite ironic since it would packet, the channel result in a reduction of needs to be smoothable channel estimate quality, in 1x and 2x HE-LTF. which BEAM_CHANGE is supposed to help with.
HE beamformed transmissions come with a "smoothing" or "beamformed" indication in the preamble, so the receiver can adjust. This is not possible if BF is applied from the start of the packet. Since the receiver can not know whether BF is applied or not, it may have no choice but to disable channel smoothing. This would be quite ironic since it would result in a reduction of channel estimate quality, which BEAM_CHANGE is supposed to help with. the the case of BEAM_CHANGE = 0. Smoothing or not is a receiver’s decision, it is not related to BEAM_CHANGE. The receiver checks if the channel can be smoothed or not. Even for beamformed frames, sometimes it can be smoothed. For 11ax, even beamformed packet, the channel needs to be smoothable in 1x and 2x HE-LTF.
11-18-1505-00-00ax-lb233-cr-mac-txvector.docx