Date: 2016-03-14

• 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

• Mainly for data section; LTF has its own pilot values

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.