Date: 2016-03-14
Pilot location has been decided for 11ax SU/OFDMA/MU MIMO transmissions Pilot location has been decided for 11ax SU/OFDMA/MU MIMO transmissions Motions on pilot mapping were passed: - All 802.11ax PPDUs use single stream pilots (as defined in 11ac) in the data section
- Single stream pilot (like 11ac) in HE-LTF shall be used for SU, DL and UL OFDMA as well as DL MU-MIMO transmissions
This presentation discuss pilot sequences
Simply reuse 11ac/11ah pilot sequences Simply reuse 11ac/11ah pilot sequences - Depending on RU size, select the corresponding 11ac/ah pilot sequence
- Sequence is tied to the number of pilots in a RU only
- RU with same size always has same pilot sequence regardless its location and PPDU BW
Benefit - Reuse the existing sequences so that hardware can be consistent in processing
- RUs with the same size can be built and demoded in the same way
For 2 pilots in any 26-tone RU, use single stream pilot sequence of 11ah 1MHz For 2 pilots in any 26-tone RU, use single stream pilot sequence of 11ah 1MHz For 4 pilots in any 52/106-tone RU, use single stream pilot sequence of 11ac 20MHz For 8 pilots in any 242-tone RU, use single stream pilot sequence of 11ac 80MHz
For 16 pilots in any 484/996-tone RU, use single stream pilot sequence of 11ac 160MHz For 16 pilots in any 484/996-tone RU, use single stream pilot sequence of 11ac 160MHz Duplicate pilots of 996-tone RU for 2x996-tone RU (HE160MHz SU)
Propose to apply 11ax pilot tone mapping in the same way as 11ac SSP - Based on defined pilot sequence for certain RU, pilot values are shifted on pilot tones from symbol to symbol
- For example: for 52/106-tone RU with base pilot sequence of {1,1,1,-1}, the 1st data symbol with symbol index 0 will take the values {1,1,1,-1} on its 4 pilots, the second symbol has {1,1,-1,1}, the third symbol gets {1,-1,1,1}, and so on
- See detailed formula in Appendix
- Overlaying pilot polarity value: same as 11ac
Applicable to all options
We proposed base pilot sequences for 11ax PPDU Application of 11ax pilot sequence is proposed to be the same as in 11ac
Do you agree that 11ax pilot sequences shall reuse the 11ac/ah pilot sequences as shown in slides 13 and 14? Do you agree that 11ax pilot sequences shall reuse the 11ac/ah pilot sequences as shown in slides 13 and 14? Y/N/A
Do you agree that 11ax pilot sequence should be applied in the same way as in 11ac SSP Do you agree that 11ax pilot sequence should be applied in the same way as in 11ac SSP - Pilot values are shifted on pilot tones from symbol to symbol for each RU
- Overlaying pilot polarity value: same as in 11ac
Y/N/A
The pilot tone mapping in 26-tone RUs is: The pilot tone mapping in 26-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
The pilot tone mapping in 52-tone RUs is: The pilot tone mapping in 52-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
The pilot tone mapping in 106-tone RUs is: The pilot tone mapping in 106-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
The pilot tone mapping in 242-tone RUs is: The pilot tone mapping in 242-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
The pilot tone mapping in 484-tone RUs is: The pilot tone mapping in 484-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
The pilot tone mapping in 996-tone RUs is: The pilot tone mapping in 996-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
The pilot tone mapping in 2x996-tone RUs is: The pilot tone mapping in 2x996-tone RUs is: where is given in the table on slide 4, and where n is the HE-DATA symbol index starting at 0. Including the pseudo random scrambling sequence, the pilot value for the kth tone, with , is pn+zPnk, where z is TBD for HE depending on number of SIG symbols in preamble, and where pn is defined in Section 17.3.5.9 of IEEE802.11. This doesn’t include the Gamma rotation yet.
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