Pilot location has been decided for 11ax su/ofdma/mu mimo transmissions


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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



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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