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Hi Lin, Not sure if we are aligned. With the 11ax scrambler as in the example below, at transmitter side, do you think the service field
after scrambling is “0000111” or “1111111”? BRs, Xiaogang. From: Lin Yang <linyang@xxxxxxxxxxxxxxxx>
Hi Xiaogang, Regardless if we should keep the initial state as the 1st a few bits in the scrambling sequence. In the following plot in Chenchen’s PDT, the initial state is sent
to both XOR scrambling and the shift register. Yes the first 7 bits (now is 11 bits) are skipped and replaced by the initial state bits but they will be re-generated after the 11bits initial state move into the shift register completely. So with the initial
state upfront, the sequence does not change, the difference is the entire scrambling sequence starts from the last state of the sequence generated by the given initial state. Thanks, Lin From: Chen, Xiaogang C <xiaogang.c.chen@xxxxxxxxx>
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>
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]
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>
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]
Hi Chenchen, I added more comments on top of Lin’s. Thanks. BRs, Xiaogang. From: Lin Yang <linyang@xxxxxxxxxxxxxxxx>
Thanks Chenchen for drafting the scrambler section. Please find my comments in the attached file.
Thanks, Lin From: liuchenchen <liuchenchen1@xxxxxxxxxx>
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 To unsubscribe from the STDS-802-11-TGBE list, click the following link:
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