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VHT-SIG-B in NDPs

VHT-SIG-B in NDPs. Authors:. Date: 2010-11-02. Authors (cont’d):. Abstract. This presentation proposes fixed bit patterns for VHT-SIG-B to fill in a TBD in the 11ac spec framework (11-0992r15). Introduction. The 11ac specification framework (11-0992r15) defines:

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VHT-SIG-B in NDPs

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  1. VHT-SIG-B in NDPs Authors: Date: 2010-11-02 Allert van Zelst, Qualcomm

  2. Authors (cont’d): Allert van Zelst, Qualcomm

  3. Abstract This presentation proposes fixed bit patterns for VHT-SIG-B to fill in a TBD in the 11ac spec framework (11-0992r15). Allert van Zelst, Qualcomm

  4. Introduction • The 11ac specification framework (11-0992r15) defines: • The VHT NDP format is shown in Figure 8 and has the following properties: • has the same format as the VHT PPDU but with no data portion • has a VHT-SIG-A indicating a SU packet • and has VHT-SIG-B carrying a TBD fixed bit pattern Figure 8 -- VHT NDP format • This presentation proposes bit patterns for VHT-SIG-B Allert van Zelst, Qualcomm

  5. Disadvantage of Using the Normal SU Content of VHT-SIG-B for NDPs • For NDPs, the VHT-SIG-B length field will be zero, resulting in very high Peak-to-Average Power Ratios (PAPRs) • The PAPR of VHT-SIG-B with a length field of 0, with a four times oversampled IFFT, equals • for 20 MHz: 12.06 dB • for 40 MHz: 15.21 dB • for 80 MHz: 15.72 dB Allert van Zelst, Qualcomm

  6. Proposal for Fixed Bit Patternsin VHT-SIG-B of NDPs • Select bit patterns in the 20, 21, and 23 useful VHT-SIG-B bits for 20, 40, and 80 MHz, respectively, that have the lowest Peak-to-Average Power Ratio (PAPR) • The following sequences (showed LSB first) result in the lowest PAPR when using a four times oversampled IFFT • 20 MHz: 0 0 0 0 0 1 1 1 0 1 0 0 0 1 0 0 0 0 1 0 (PAPR = 3.16 dB) • 40 MHz: 1 0 1 0 0 1 0 1 1 0 1 0 0 0 1 0 0 0 0 1 1 (PAPR = 5.42 dB) • 80 MHz: 0 1 0 1 0 0 1 1 0 0 1 0 1 1 1 1 1 1 1 0 0 1 0 (PAPR = 5.13 dB) Allert van Zelst, Qualcomm

  7. Pre-motion • Move to accept the bit patterns as listed on slide 5 as the fixed bit patterns for VHT-SIG-B in VHT NDPs? • Y • N • A Allert van Zelst, Qualcomm

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