1 / 21

PAPR Reduction for HE SIG-B

PAPR Reduction for HE SIG-B. Date: 2016-05-16. Authors:. Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors(continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Introduction.

ortegaj
Télécharger la présentation

PAPR Reduction for HE SIG-B

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PAPR Reduction for HE SIG-B Date: 2016-05-16 Authors: Bin Tian, Qualcomm

  2. Authors (continued) Bin Tian, Qualcomm

  3. Authors (continued) Bin Tian, Qualcomm

  4. Authors (continued) Bin Tian, Qualcomm

  5. Authors (continued)

  6. Authors(continued) Bin Tian, Qualcomm

  7. Authors (continued) Bin Tian, Qualcomm

  8. Authors (continued) Bin Tian, Qualcomm

  9. Authors (continued) Bin Tian, Qualcomm

  10. Authors (continued) Bin Tian, Qualcomm

  11. Introduction • HE SIG-B can have very large PAPR when one OFDM symbol has all (or almost all) zeros or ones • Several examples are provided in the following slides. • In this presentation we investigate two schemes for HE SIG-B PAPR reduction Bin Tian, Qualcomm

  12. Example 1: All Zero Padding Bits Non-padding SIGB symbols Zero Padding symbols Zero Padding STA specific information subfields/CRC/Tail Common bits … Zero Padding STA specific information subfields/CRC/Tail Common bits SIG-B Channel 1 SIG-B Channel 2 …

  13. Example 2: Long Sequence of Zeros in HE-SIGB Content Common bits CRC (4) Tail (6) 2 STA info (21) + CRC (4) + Tail (6) 2 STA info (21) + CRC (4) + Tail (6) Padding … SIGB symbol (26 bits) 36 zeros in a row 000000 00000000000 0000 000 0 0 0 00000000011 1000 000 1 0 1 6 11 4 3 1 1 1 11 4 3 1 1 1 4 Tail STAID Nss BF DCM Coding STAID Nss BF DCM Coding CRC MCS MCS Broadcast Frame Unicast Frame Broadcast Frame Unicast Frame Note: Cases with a lot of sequential zeros can happen even if the bit ordering of the field are shuffled. Bin Tian, Qualcomm

  14. Solutions 1: Scrambler • Reuse the 11a scrambler on HE SIG-B content • Fixed scrambling seed preferred. No additional seed signaling required • Seed may not be optimal for certain content • Implementation drawback: need to skip scrambling tail bits in each common/per user code block • Use random padding bits • Assume scrambler doesn’t cover the padding bit Bin Tian, Qualcomm

  15. Solutions 2: Phase Rotation • Phase rotation is proposed in [1] to mitigate the PAPR issue for DCM MCS0 • Same approach can be reused to solve PAPR issue for other modulations • Phase rotation on data tones after constellation mapping • In each 20MHz HE-SIGA/B, there are 52 data tones. For the kth data tone, phase rotation pattern is defined as in [1] 1 for 0=<k<26 (-1)k for 26=<k<52 • For DCM + MCS0, since the same rotation is applied in the DCM BPSK bit mapping, this step of phase rotation after constellation mapping can be skipped • Legacy gamma rotation still applies among different 20MHz channels Bin Tian, Qualcomm

  16. Simulation • High PAPR configuration identified is simulated • PAPR results of following cases are compared • Data • HE-SIGB: without PAPR mitigation • HE-SIGB +11a scrambler with random seed • HE-SIGB +11a scrambler with fixed seed (0x01) • HE-SIGB with phase rotation Bin Tian, Qualcomm

  17. Simulation Results – MCS0 • Both scrambler and phase rotation method can effectively reduce the PAPR Bin Tian, Qualcomm

  18. Simulation Results – MCS5 • Both scrambler and phase rotation method can effectively reduce the PAPR Bin Tian, Qualcomm

  19. Summary • Two schemes are proposed for PAPR reduction on HE SIG-B • 11a scrambler based approach • Phase rotation • Simulations show that both schemes are effective • Prefer the phase rotation approach due to its simplicity in implementation Bin Tian, Qualcomm

  20. Straw Poll 1 • Do you support the following PAPR reduction scheme for HE SIG-B • Phase rotation is applied to the HE SIG-B data tones after constellation mapping. For the kth data tone in the HE SIG-B, the phase rotation pattern is defined as 1 for 0=<k<26 and (-1)k for 26=<k<52 • For DCM + MCS0, since the same rotation has already been applied in the DCM BPSK bit mapping, this step of phase rotation after constellation mapping shall be skipped • Legacy gamma rotation still applies among different 20MHz channels Bin Tian, Qualcomm

  21. Reference [1] IEEE 802.11-16/0xxxr0 On Modulation of MCS0 DCM and DCM Capability Bin Tian, Qualcomm

More Related