1 / 22

Midamble Design Continued

Midamble Design Continued. Authors:. Date: 2017-09-12. Overview. Doppler bit and Midamble design were well-discussed in reference [1]~[4]. Well-accepted design concepts in SPs Following two topics are addressed in this presentation: More simulations on >2SS—per request in July meeting

ianh
Télécharger la présentation

Midamble Design Continued

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. Midamble Design Continued Authors: • Date:2017-09-12 Hongyuan Zhang, Marvell, et al

  2. Overview • Doppler bit and Midamble design were well-discussed in reference [1]~[4]. • Well-accepted design concepts in SPs • Following two topics are addressed in this presentation: • More simulations on >2SS—per request in July meeting • Propose a special handling rule for the last Midamble period at the end of PPDU. Hongyuan Zhang, Marvell, et al

  3. I. More Simulation for 3SS and 4SS • Simulation Setting • Channel: • DNLOS channel, • Doppler: [3kmph, 60kmph, 3kmph] • Packet length 100 OFDM symbols, • LDPC, 80MHz, 5GHz Hongyuan Zhang, Marvell, et al

  4. Goodput Results-3SS, 4SS Hongyuan Zhang, Marvell, et al

  5. Goodput Results All with Midambles Hongyuan Zhang, Marvell, et al

  6. II. Last Period Special Handling • When there is only one residue symbol over the last midamble period, it may not be worthwhile to insert the last midamble. • In many cases the number of info bits in the last symbol is small (e.g. when pre-FEC padding factor is small, or data rate is low), inserting the midamble may reduce the efficiency while not improving the PER much. • Propose to not insert the last midamble in this case: Hongyuan Zhang, Marvell, et al

  7. (Updated) TxPHY Parameters • Tx side: TXTIME needs to be adjusted when midamble is present. • All other parameters (e.g. L-LENGTH) are adjusted based on TXTIME. where Hongyuan Zhang, Marvell, et al

  8. (Updated) Rx PHY Parameters (1) • Rx computation on number of midambles NMA—multiple options, receiver may choose whatever more feasible for its implementation, e.g. where Hongyuan Zhang, Marvell, et al

  9. Rx PHY Parameters (2) • Rx computation on NSYMand TPE: • Rx computation on RXTIME: Hongyuan Zhang, Marvell, et al

  10. Simulations Settings • HE 11ax 80MHz, SU PPDU • DNLOS: 3 clusters, speed [3kmph, 60kmph, 3kmph] • LDPC, 1SS and 4SS • Goodput is calculated as • Data rate (1-PER) midamble efficiency • Data: 21 (or 22)data symbols with different Pre-FEC factor • Midamble Periodicity MMA = 10 symbols • With and without midamble after 20th data symbol Hongyuan Zhang, Marvell, et al

  11. 4x1-1ss, Pre-FEC factor = 1 Hongyuan Zhang, Marvell, et al

  12. 4x1-1ss, Pre-FEC factor = 2 Hongyuan Zhang, Marvell, et al

  13. 4x1-1ss, Pre-FEC factor = 3 Hongyuan Zhang, Marvell, et al

  14. 4x1-1ss, Pre-FEC factor = 4 Hongyuan Zhang, Marvell, et al

  15. 4x4-4ss, Pre-FEC factor = 1 Hongyuan Zhang, Marvell, et al

  16. 4x4-4ss, Pre-FEC factor = 2 Hongyuan Zhang, Marvell, et al

  17. 4x4-4ss, Pre-FEC factor = 3 Hongyuan Zhang, Marvell, et al

  18. 4x4-4ss, Pre-FEC factor = 4 Hongyuan Zhang, Marvell, et al

  19. 4x1-1ss, Pre-FEC factor = 4, 22 symbols Hongyuan Zhang, Marvell, et al

  20. Conclusions • More simulations provided to show the advantage of midamble even when Nss>2. • Propose a special handling of the last midamble period at the end of PPDU, and the corresponding equation updates. • Refer to [5] for the complete text proposal on Doppler Hongyuan Zhang, Marvell, et al

  21. SP1 • Do you agree to accommodate the midamble last period handling rule and the corresponding Tx/Rx equations as described in slides 6~9? Hongyuan Zhang, Marvell, et al

  22. References • [1] 11-17-0734-01-00ax-doppler-discussions • [2] 11-17-0773-02-00ax-thoughts-on-doppler-design-in-802-11ax • [3] 11-17-0994-00-00ax-midamble-design • [4] 11-17-0960-00-00ax-follow-up-on-doppler-design-in-802-11ax • [5] 11-17-0995-02-00ax-Doppler-comment-resolutions Hongyuan Zhang, Marvell, et al

More Related