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Thanks Ross for the prompt review. I will correct the typos in the next version. Masked LTF sequence was not used much in 11ax, and yes, it would be good to get rid of it, especially as the number of streams are going up-to 16. I remember the performance of that scheme degraded
as the number of streams increased (the orthogonality assumption over frequency broke down more and more as number of masked tones increased, due to channel variation across frequency ). It does not make much sense for 11be.
Also, no pilot mode might be problematic with 16 LTFs as well. See slide 4 of 11-20/0382, where we showed issues without tracking in the 16 EHT-LTF case. So, yes performance analysis is saying that these two modes should not be allowed in 11be. Regards, Sameer From: Yujian (Ross Yu) <ross.yujian@xxxxxxxxxx> CAUTION: This email originated from outside of
the organization. Hi Sameer, Thanks for the contribution. Some minor comments. The subclause number is 27.3.3. Should be changed to 34.x.x 27.3.3.1.2 Maximum number of spatial streams in an
HE MU PPDU A non-AP STA that supports UL MU-MIMO shall support transmitting an
HE TB PPDU using MU-MIMO where: HE should be EHT. Another clarification question, you mentioned: Single stream pilot is the only EHT-LTF mode for the transmission of an EHT TB PPDU where MU-MIMO is employed on an RU, both when the MU-MIMO RU does or does not span the entire PPDU BW. So your intention is to not support something similar as “HE masked HE-LTF sequence mode” for 11be? How about something like HE no pilot HE-LTF mode (1X HE-LTF without pilot)? regards 于健 Ross Yu Huawei Technologies 发件人: Sameer Vermani [mailto:svverman@xxxxxxxxxxxxxxxx]
Dear MU-MIMO TTT members and all, I have uploaded the initial draft for the PHY: MU-MIMO section to the server. Link is below. https://mentor.ieee.org/802.11/dcn/20/11-20-1160-00-00be-pdt-phy-mu-mimo.docx Please let me know if you have any feedback. Thank you. Regards, Sameer To unsubscribe from the STDS-802-11-TGBE list, click the following link:
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