IEEE 802.11-17: Midamble Design for 5/15/2025 Presentation
"Explore the midamble design proposal for IEEE 802.11-17 focusing on addressing Doppler scenarios for 11ax. The presentation delves into midamble frame format, periodicity simulations, and PHY parameter computations. Emphasis is placed on power fluctuation compensation, HE-LTF proposals, and detailed simulation setups for high throughput feasibility in various channel scenarios."
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5/15/2025 doc.: IEEE 802.11-17/0994r0 Midamble Design Date: 2017-07-06 Authors: Name Hongyuan Zhang Hua Mu Affiliations Address Marvell Phone email hongyuan@marvell.com Marvell 5488 Marvell Ln, Santa Clara, CA 95054 hmu@marvell.com Yan Zhang Rui Cao Marvell Marvell ruicao@marvell.com Submission Slide 1 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Introduction Midamble was proposed in [1][2] to address the Doppler scenario for 11ax. This presentation: Midamble Frame Format Further simulations to address the options for Midamble periodicity Tx and Rx PHY Parameter Computations Submission Slide 2 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Midamble Format (1) According to [1], the typical power fluctuation between midambles in predestrian scenarios is low, much below the typical headroom. Even if there is some power fluctuation, receiver should be able compensate digitally without additional STF field. Propose to NOT have HE-STF field in the midamble. MMA=5 MMA=20 Submission Slide 3 Hongyuan Zhang, Marvell, et al Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Midamble Format (2) HE-LTF: propose HE-LTFs in midamble is the same as those in the preamble of the same PPDU. ???? ??? Number of Midambles: ???= after the MMA-th symbol, and no Midamble inserted after the last (even when NSYM is dividable by MMA). 1, i.e. the 1st Midamble is right MMA Data Symbols MMA Data Symbols ... ... ... HE Preamble Midamble Midamble ... HE-LTF HE-LTF Identical to the HE-LTF field(s) in Peamble Submission Slide 4 Hongyuan Zhang, Marvell, et al Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Midamble Periodicity Simulation Setups: DNLOS channel, speed: [3kmph, 60kmph, 3kmph] UMi-LOS channel, Speed: 60kmph on 2nd and 3rd clusters, 3kmph on all other clusters 80M BW @ 5GHz testing high throughput feasibility Packet length: 100 OFDM symbols regardless of MCS LDPC, 4xLTF, GI 1.6us 4x2, 2ss 2x4, 2ss 1x1, 1ss Submission Slide 5 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 DNLOS 1x1 Submission Slide 6 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 DNLOS 4x2 Submission Slide 7 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 DNLOS, 2x4 Submission Slide 8 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 UMI-LOS, 1x1 Submission Slide 9 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 UMI-LOS, 4x2 Submission Slide 10 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 UMI-LOS, 2x4 Submission Slide 11 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 DNLOS, MCS1, 1x1, Different Midamble Periodicity Submission Slide 12 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Midamble Periodicity Discussions MMA = 10 is a good choice Good performance in most cases Reduces PER at high MCS and/or high Doppler MMA = 20 has some advantage at low MCS and/or low Doppler Further increasing MMA value does not improve much from MMA = 20 Propose to define 2 options of midamble periodicity: 10 and 20 symbols Tradeoff between flexibility and complexity Submission Slide 13 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Tx PHY Parameters Tx side: TXTIME needs to be adjusted when midamble is present. All other parameters (e.g. L-LENGTH) are adjusted based on TXTIME. = + + + + TXTIME 20 . HE_PREAMBLE T T SignalExtension + N SYM T N N HE LTF SYM T HE LTF SYM MA PE ???? ??? ???? ??? where ???= 11 = 1 Submission Slide 14 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Rx PHY Parameters (1) Rx computation on number of midambles NMA multiple options, receiver may choose whatever more feasible for its implementation, e.g. 0, Doppler = 0 + + ty + + 3 mod 4 3 MMA Data Symbols after the previous midamble (or preamble) 3 LENGTH m = 4 / 1, Doppler = 1 and 0 N HE PREAMBLE T PE Disambigui b SYM T T Residue T SYM T MA MA 3 3 LENGTH m 4 / 1, Otherwise HE PREAMBLE T PE Disambiguity b SYM T T MA 3 + + LENGTH m = , Residue T HE PREAMBLE T PE Disambiguity SYM b T T where MA Duration less than TSYM but longer than a midamble Corner case: ... Data Data PE Midamble L-LENGTH 4us boundary ambiguity Submission Slide 15 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Rx PHY Parameters (2) Another Example: 0, Doppler = 0 + + = = N _ 3 L LENGTH m MA 4 / 1, Doppler = 1 N HE PREAMBLE T SYM T T MA MA 3 = = 1 1 0 PE Disambiguity b b where = 0.9375 PE Disambiguity Submission Slide 16 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Rx PHY Parameters (3) Rx computation on NSYMand TPE: + + 3 LENGTH m = 4 / N HE PREAMBLE T N N HE LTF SYM T SYM T PE Disambiguity b HE LTF SYM MA 3 + + 3 LENGTH m 4 HE PREAMBLE T N SYM T N N HE LTF SYM T HE LTF SYM MA 3 = 4 T PE 4 Rx computation on RXTIME: = + + + ( ) 20 RXTIME s HE PREAMBLE T T + + N SYM T N N HE LTF SYM T HE LTF SYM MA SignalExtension PE Submission Slide 17 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 Conclusions Midamble is appropriate to address channel Doppler, meanwhile possible to achieve high throughput. Shown 80MHz, multi-stream and relative mid-high MCS performances. Simple to implement, fast industry adoption. Detailed Midamble design proposals: No HE-STF, same HE-LTF as preamble. Two periodicity options. Tx, and Rx parameter computations. Refer to [3] for detailed text change proposals (comment resolution for Doppler related CIDs) Submission Slide 18 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 SP1 Do you agree that Midamble is composed by HE-LTF(s) the same as in the preamble of the same PPDU, and no HE-STF field. There is always no midamble inserted after the last Data OFDM symbol? Submission Slide 19 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 SP2 Do you agree that there are two options of midamble periodicity, which are 10 and 20 Data OFDM symbols, respectively? Submission Slide 20 Hongyuan Zhang, Marvell, et al
5/15/2025 doc.: IEEE 802.11-17/0994r0 References [1] 11-17-0734-01-00ax-doppler-discussions [2] 11-17-0773-02-00ax-thoughts-on-doppler-design-in- 802-11ax [3] 11-17-0995-00-00ax-Doppler-comment-resolutions Submission Slide 21 Hongyuan Zhang, Marvell, et al
