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VHT-STF for 11AC

VHT-STF for 11AC. Date: 2010-07-11. Authors:. Summary. Definition of VHT-STF field Definition of VHT-STF sequence for 20MHz/40MHz/80MHz Definition of CSD values for NTX up to 8. 20/40 MHz STF Sequence. Using the same 20/40 MHz HT-STF sequence as 802.11n 20MHz HT-STF sequence:

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VHT-STF for 11AC

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  1. VHT-STF for 11AC Date: 2010-07-11 Authors: Vinko Erceg, Broadcom

  2. Summary • Definition of VHT-STF field • Definition of VHT-STF sequence for 20MHz/40MHz/80MHz • Definition of CSD values for NTX up to 8 ACcord

  3. 20/40 MHz STF Sequence • Using the same 20/40 MHz HT-STF sequence as 802.11n • 20MHz HT-STF sequence: • 40MHz HT-STF sequence: ACcord

  4. 80 MHz STF Sequence • Copies of the 20MHz STF in each 20MHz sub-band • Apply phase rotations [1, -1, -1, -1] in each 20MHz sub-band to reduce PAPR. ACcord

  5. CSD for VHT Portion of The Frame 802.11n CSD table • Propose to use the following CSD table for SU-MIMO (NTX<=8): ACcord

  6. AGC Power Error (8TX, 11nB/C/D/E, 20/40MHz)CSD = {0, -400, -200, -600, -350, -650, -100, -750} ACcord

  7. Spec Framework Wording • “The 20 MHz L-STF pattern in the VHT preamble is as defined in 20.3.9.3.3 of Std 802.11n-2009. ” • “The frequency domain sequence used to construct the VHT-STF in 20 MHz transmission is identical to the L-STF; in 40 MHz transmission, the VHT-STF is constructed from the 20 MHz version by duplicating, frequency shifting, and rotating the upper sub-carriers by 90°; in 80 MHz transmission, the VHT-STF is constructed from the 20 MHz version by replicating it in each 20 MHz band, frequency shifting, and applying appropriate phase rotations for each 20MHz sub-band. ” • “For a 160 MHz transmission, subcarriers in the VHT-STF symbol with indices -250 to -6 shall use the VHT-STF pattern for the 80 MHz VHT-STF, with the VHT-STF pattern for subcarrier index -122 mapping to subcarrier index -250 in the 160 MHz transmission. Furthermore, subcarriers in the VHT-STF symbol in the 160 MHz transmission with indices 6 to 250 shall also use the the VHT-STF pattern for the 80 MHz VHT-STF, with the VHT-STF pattern for subcarrier index -122 mapping to subcarrier index 6 in the 160 MHz transmission. All other subcarriers shall not be modulated.” • “For non-contiguous transmissions using two 80 MHz frequency segments, each 80 MHz frequency segment shall use the VHT-STF pattern for the 80 MHz VHT-STF.” ACcord

  8. Straw Polls Vinko Erceg, Broadcom

  9. Straw Poll #1 • Do you support using the VHT-STF sequence • As defined in 11n for 20 MHz and 40 MHz? • For 80 MHz, copies of the 20 MHz VHT-STF sequence for each 20 MHz subband with proper phase rotation? • For 160 MHz, copies of the 80 MHz VHT-STF sequence for each 80 MHz subband? and agree to add the following text (as shown on slide 7 ) to the specification framework document? • Yes: • No: • Abs: ACcord

  10. Straw Poll #2 • Do you support using [1 -1 -1 -1] as the 80MHz phase rotation factors for VHT-STF sequence in each 20MHz subband and agree to edit the specification framework accordingly? • Yes: • No: • Abs: ACcord

  11. Straw Poll #3 • Do you support using the following CSD table for the VHT portion of the SU-MIMO frame and agree to edit the specification framework accordingly? • Yes: • No: • Abs: ACcord

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