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HE-STF Sequences

HE-STF Sequences. Date: 2015-11-11. Authors:. Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Overview.

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HE-STF Sequences

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  1. HE-STF Sequences Date: 2015-11-11 Authors: Eunsung Park, LG Electronics

  2. Authors (continued) Eunsung Park, LG Electronics

  3. Authors (continued) Eunsung Park, LG Electronics

  4. Authors (continued) Eunsung Park, LG Electronics

  5. Authors (continued) Eunsung Park, LG Electronics

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  7. Authors (continued) Eunsung Park, LG Electronics

  8. Authors (continued) Eunsung Park, LG Electronics

  9. Authors (continued) Eunsung Park, LG Electronics

  10. Overview • Based on agreed 1x and 2x FFT size for HE-STF [1], this contribution discusses how to design HE-STF sequence for 11ax • In this contribution, we build up HE-STF sequences by combining some extra values for additional usable tones and M sequence which can yield low PAPR • All proposed sequences consist of binary values • Also, the proposed HE-STF sequences have a nested structure, and thus those maintain similarities among 20, 40, 80MHz • Extra values and coefficients of each M sequence are optimized in terms of the PAPR • While we only consider the PAPR of the entire band for 1x HE-STF (i.e. 0.8us time period), we take into account the PAPRs of all resource units of OFDMA for 2x HE-STF (i.e. 1.6us time period) • Note that PAPR is always calculated by applying 4x FFT sample rate in this contribution Eunsung Park, LG Electronics

  11. HE-STF Sequence for 0.8us Periodicity (1/3) • HE-STF sequence building procedure for 0.8us Periodicity • M sequence is defined in the next page • Candidates of a and c :{1, -1} {M} 20MHz {c1M} 20MHz {M, 0, M} 40MHz {c2M, 0, c3M} 40MHz {M, 0, M,0, M, 0, M} 80MHz {c4M, a1, c5M,0, c6M, a2, c7M} 80MHz Extra value Extra value 1. Repeat the structure 2. Put extra values and coefficients and optimize those values Eunsung Park, LG Electronics

  12. HE-STF Sequence for 0.8us Periodicity (2/3) • The coefficients and extra values have been selected in such a way that the PAPR of the entire band is minimized • M sequence is defined as follows • M = {-1 -1 -1 +1 +1 +1 -1 +1 +1 +1 -1 +1 +1 -1 +1} • 20MHz • HES-112,112(-112:16:112) = M *(1+j)*sqrt(1/2) • HES-112,112(0) = 0 • 40MHz • HES-240,240(-240:16:240) = {M, 0, -M} *(1+j)*sqrt(1/2) • 80MHz • HES-496,496(-496:16:496) = {M, 1, -M, 0, -M, 1, -M} *(1+j)*sqrt(1/2) Eunsung Park, LG Electronics

  13. HE-STF Sequence for 0.8us Periodicity (3/3) • PAPR [dB] • In 20MHz and 40MHz, the proposed sequences have lower PAPR than those of 11ac • Also, even in 80MHz, the PAPR of the proposed sequence is comparable Eunsung Park, LG Electronics

  14. HE-STF Sequence for 1.6us Periodicity (1/7) • HE-STF sequence building procedure for 1.6us Periodicity {M, 0, M} 20MHz {M, 0, M,0, M, 0, M} 40MHz {M, 0, M,0, M, 0, M, 0, M, 0, M,0, M, 0, M} 80MHz 1. Repeat the structure {c1M, 0, c2M} 20MHz {c3M, a1, c4M,0, c5M, a2, c6M} 40MHz {c7M, a3, c8M,a4, c9M, a5, c10M,0, c11M, a6, c12M,a7, c13M, a8, c14M} 80MHz 2. Put extra values and coefficients and optimize those values Eunsung Park, LG Electronics

  15. HE-STF Sequence for 1.6us Periodicity (2/7) • The coefficients and extra values have been selected in such a way that based on the agreed OFDMA tone plan [1], the worst PAPR among all PAPRs of resource units is minimized • In order to check the PAPRs of all resource units, we have considered the UL OFDMA where each user occupies only one resource unit • 20MHz • HES-120,120(-120:8:120) = {M, 0, -M} *(1+j)*sqrt(1/2) • 40MHz • HES-248,248(-248:8:248) = {M, -1, -M, 0, M, -1, M} *(1+j)*sqrt(1/2) • HES-248,248(±248) = 0 • 80MHz • HES-504,504 (-504:8:504) = {M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M} *(1+j)*sqrt(1/2) • HES-504,504(±504) = 0 Eunsung Park, LG Electronics

  16. HE-STF Sequence for 1.6us Periodicity (3/7) • PAPR [dB] • Assuming UL OFDMA, we have checked PAPR in all resource units with agreed tone plans • 20MHz 7 DC 1 1 13 26 26 26 26 26 26 1 26 13 26 1 6 Edge 5 Edge 7 DC 1 13 1 52 52 52 52 13 1 1 5 Edge 6 Edge 7 DC 5 Edge 6 Edge 13 102+4 pilots 102+4 pilots 13 5 Edge 6 Edge 242 + 3 DC Eunsung Park, LG Electronics

  17. HE-STF Sequence for 1.6us Periodicity (4/7) • PAPR [dB] (cont.) • 40MHz 5 DC 12 Edge 11 Edge 2 2 2 26 26 1 1 1 1 1 1 26 26 26 26 26 26 26 26 26 26 26 26 2 1 1 26 26 26 26 5 DC 11 Edge 12 Edge 1 2 1 1 2 1 1 2 1 52 52 52 52 26 26 52 52 1 2 1 52 52 5 DC 11 Edge 12 Edge 1 1 102+4 1 26 102+4 26 102+4 1 1 1 102+4 1 1 5 DC 11 Edge 12 Edge 242 242 Eunsung Park, LG Electronics

  18. HE-STF Sequence for 1.6us Periodicity (5/7) • PAPR [dB] (cont.) • 80MHz 1 1 1 1 1 26 26 26 1 26 1 26 26 26 1 26 26 26 1 26 26 2 26 26 2 26 26 26 1 26 26 2 26 26 2 26 26 2 2 26 1 26 2 2 26 1 26 26 26 2 26 26 26 26 2 26 26 26 7 DC 1 1 1 1 1 52 1 1 1 52 52 52 52 52 26 2 26 2 2 52 2 2 52 2 52 52 52 52 52 52 2 2 13 11 Edge 1 1 1 52 1 52 2 26 2 26 12 Edge 13 7 DC 11 Edge 13 13 12 Edge 1 1 102+4 102+4 102+4 102+4 26 1 1 1 26 1 1 1 1 26 1 2 102+4 26 2 102+4 102+4 102+4 1 1 11 Edge 7 DC 13 13 12 Edge 242 242 242 242 11 Edge 7 DC 13 13 12 Edge 996 usable tones +5 DC Eunsung Park, LG Electronics

  19. HE-STF Sequence for 1.6us Periodicity (6/7) • PAPR [dB] (cont.) • 80MHz (cont.) • PAPRs of left hand side 26 52 106 242 484 Eunsung Park, LG Electronics

  20. HE-STF Sequence for 1.6us Periodicity (7/7) • PAPR [dB] (cont.) • 80MHz (cont.) • PAPRs of right hand side • PAPR of center 26 tone RU is 1.94 • PAPR of entire band is 5.77 26 52 106 242 484 Eunsung Park, LG Electronics

  21. Summary • We have proposed HE-STF sequences for 0.8us and 1.6us periodicity • For building up HE-STF sequences, we have simply applied the nested structure and put some extra values and coefficients • HE-STF sequences for 0.8us periodicity have been optimized in terms of the PAPR of the entire band • Based on the OFDMA tone plan, HE-STF sequences for 1.6us periodicity which minimize the worst PAPR have been determined • The proposed sequences use binary signaling as in 11ac • In terms of PAPR, the proposed sequences are not bottle-necks compared to the data part as shown in appendix Eunsung Park, LG Electronics

  22. Straw poll • Do you agree to add the following HE-STF sequences for 0.8us and 1.6us periodicity to the 11ax SFD: • M = {-1 -1 -1 +1 +1 +1 -1 +1 +1 +1 -1 +1 +1 -1 +1} • 1x HE-STF sequences • 20MHz • HES-112,112(-112:16:112) = M *(1+j)*sqrt(1/2) • HES-112,112(0) = 0 • 40MHz • HES-240,240(-240:16:240) = {M, 0, -M} *(1+j)*sqrt(1/2) • 80MHz • HES-496,496(-496:16:496) = {M, 1, -M, 0, -M, 1, -M} *(1+j)*sqrt(1/2) • 2x HE-STF sequences • 20MHz • HES-120,120(-120:8:120) = {M, 0, -M} *(1+j)*sqrt(1/2) • 40MHz • HES-248,248(-248:8:248) = {M, -1, -M, 0, M, -1, M} *(1+j)*sqrt(1/2) • HES-248,248(±248) = 0 • 80MHz • HES-504,504 (-504:8:504) = {M, -1, M, -1, -M, -1, M, 0, -M, 1, M, 1, -M, 1, -M} *(1+j)*sqrt(1/2) • HES-504,504(±504) = 0 Eunsung Park, LG Electronics

  23. References [1] 11-15-0132-09-00ax-spec-framework Eunsung Park, LG Electronics

  24. Appendix Eunsung Park, LG Electronics

  25. PAPR comparison betweenData and 2x HE-STF • The CDF for the data and 2x HE-STF PAPR in UL OFDMA with the tone plan described in slide 8-10 will be shown in the next three slides • We obtain the PAPR assuming each user occupies only one resource unit • As shown in slide 8-10, possible resource units (max tone units are just for checking on entire band) are • Nine 26, four 52, two 106 and one 242 tone units in 20MHz • Eighteen 26, eight 52, four 106, two 242 and one 484 tone units in 40MHz • Thirty-seven 26, sixteen 52, eight 106, four 242, two 484 and one 994 tone units in 80MHz • Then, we aggregate PAPR results of all possible resource units for each bandwidth and plot the CDF Eunsung Park, LG Electronics

  26. PAPR Comparison - 20MHz Eunsung Park, LG Electronics

  27. PAPR Comparison - 40MHz Eunsung Park, LG Electronics

  28. PAPR Comparison - 80MHz Eunsung Park, LG Electronics

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