Hi Chenchen
The current figure actually changed the scrambling sequence. It works but it’s a new way to descramble.
Take the follow note as an example, with the current figure the sequence will be “1111111(initial state) 0 11110010….” So the first 7 bits are skipped and replaced with all
1.
For Rx, since the sequence is repeated, receiver only need to find the 7 bits match the first 7bits of service field and continue roll the 127bits sequence. It doesn’t need
to generate only the fly.
BRs,
Xiaogang.
From: liuchenchen <liuchenchen1@xxxxxxxxxx>
Sent: Friday, September 18, 2020 5:27 PM
To: Chen, Xiaogang C <xiaogang.c.chen@xxxxxxxxx>; STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: 答复: [STDS-802-11-TGBE] PDT of scrambler and LTF sequence Uploaded
Hi
Xiaogang
I think you referring to only the scramble case. But to descramble, the initial state shall be estimated and the scrambler shall be initialized. The same scrambler
is used to scramble transmit data and to descramble receive data. So it may be better to keep it there.
BRs
Chenchen Liu
发件人: Chen, Xiaogang
C [mailto:xiaogang.c.chen@xxxxxxxxx]
发送时间: 2020年9月18日 23:55
收件人:
STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: Re: [STDS-802-11-TGBE] PDT of scrambler and LTF sequence Uploaded
Hi Chenchen
I double checked with Youhan and the rule should be as in the new figure. i.e. we don’t need the initialization branch which is only for non-HT dup BW indication.
Also I checked
I.1.5.2 Scrambling the BCC example
in 11md draft. You can see the first 7 bits after scrambling is
not “1011101”
which is used to initialize the scrambler. If the initialization branch always exist, the first 7 bits after scrambling should be “1011101”.
BRs,
Xiaogang.
From: liuchenchen <liuchenchen1@xxxxxxxxxx>
Sent: Thursday, September 17, 2020 11:50 PM
To: Chen, Xiaogang C <xiaogang.c.chen@xxxxxxxxx>;
STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: 答复: [STDS-802-11-TGBE] PDT of scrambler and LTF sequence Uploaded
Hi Xiaogang
Thanks for your comments. All your comments are accepted except the modification to the figure. The initialization is always needed I think. We can talk more
on that if needed.
BRs
Chenchen Liu
发件人: Chen, Xiaogang
C [mailto:xiaogang.c.chen@xxxxxxxxx]
发送时间: 2020年9月18日 2:51
收件人:
STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: Re: [STDS-802-11-TGBE] PDT of scrambler and LTF sequence Uploaded
Hi Chenchen,
I added more comments on top of Lin’s. Thanks.
BRs,
Xiaogang.
From: Lin Yang <linyang@xxxxxxxxxxxxxxxx>
Sent: Wednesday, September 16, 2020 9:40 PM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBE] PDT of scrambler and LTF sequence Uploaded
Thanks Chenchen for drafting the scrambler section. Please find my comments in the attached file.
Thanks,
Lin
From: liuchenchen <liuchenchen1@xxxxxxxxxx>
Sent: Wednesday, September 16, 2020 8:13 PM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [EXT] [STDS-802-11-TGBE] PDT of scrambler and LTF sequence Uploaded
Dear TTT members and all.
The PDT draft on EHT PHY data scrambler and EHT LTF sequences has been uploaded. Please check it out and share your comments so as to make it better.
https://mentor.ieee.org/802.11/dcn/20/11-20-1495-00-00be-pdt-of-eht-ltf-sequences.docx
Thank you
Best regards
Chenchen
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