May 2019 doc IEEE 802 11 190686 r

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May 2019 doc. : IEEE 802. 11 -19/0686 r 2 PHY Numerology Discussions Date:

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 PHY Numerology Discussions Date: 2019 -05 -16 Authors: Submission Slide 1 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Introduction • In [1,

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Introduction • In [1, 2, 3], different 11 bd OFDM numerologies were investigated. • Tone spacing of 39 k. Hz, e. g. 11 ac 80 MHz downclock by 8, does not provide good tolerance to channel doppler. • In this contribution, more simulation results are provided for 11 bd 10 MHz OFDM numerology • 11 ac 20 MHz downclock by 2, and • 11 ac 40 MHz downclock by 4. • We will also discuss the 11 bd 20 MHz PPDU OFDM numerology. Submission Slide 2 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Simulation Settings • •

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Simulation Settings • • • 10 MHz DSRC channel @5. 9 GHz Channel model: C 2 C channel with pure Doppler CFO: uniform [-10 10]ppm on both Tx and Rx side. 1 x 1, 1 ss, 300 bytes. Ideal timing. LDPC with Midamble • 11 n LDPC codes • Midamble: one VHT-LTF, Period – 2, 4, 6, 8, 10 • OFDM numerology: • 11 ac 20 MHz DC 2 vs 11 ac 40 MHz DC 4 • Goodput is the maximum achievable effective data rate. Goodput (SNR) = max. MCS, M{Rate(MCS) * (1 -PER(MCS, SNR))* M/(M+1)} • M is the midamble period Submission Slide 3 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Rural LOS • Low

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Rural LOS • Low doppler channel: 40 MHz DC 4 is slightly better due to more number of pilots. Submission Slide 4 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Urban Approaching LOS •

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Urban Approaching LOS • Low doppler channel: 40 MHz DC 4 is slightly better due to more number of pilots. Submission Slide 5 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Urban Crossing NLOS •

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Urban Crossing NLOS • • 20 MHz DC 2 is preferred at high SNR, as 40 MHz DC 4 needs denser Midamble 40 MHz DC 4 is slightly better at low-medium SNR Submission Slide 6 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Highway LOS • •

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Highway LOS • • 20 MHz DC 2 is preferred at high SNR, as 40 MHz DC 4 needs denser Midamble 40 MHz DC 4 is slightly better at low-medium SNR Submission Slide 7 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Highway NLOS • •

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Highway NLOS • • 20 MHz DC 2 is preferred at medium-high SNR, as 40 MHz DC 4 needs denser Midamble. 40 MHz DC 4 is slightly better at low SNR Submission Slide 8 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 10 MHz Numerology Discussion

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 10 MHz Numerology Discussion • 11 ac 20 MHz DC 2 is shown to be a better option compared with 11 ac 40 MHz DC 4 • Similar goodput for low Doppler channels, and low SNR range. • Better goodput for higher Doppler channels @medium-high SNR. • Tone map: 11 ac 20 MHz v. s. 11 a/g 20 MHz • 11 ac 20 MHz OFDM tone plan uses four extra tone [-28 -27 27 28] on the edge compared to 11 a/g. • With state-of-art technology in Wi. Fi, to meet the spectrum mask with four extra tones is not very difficult. • 11 ac 20 MHz tone plan can achieve ~8% better OFDM efficiency. • No need to redefine LDPC tone mapper. Submission Slide 9 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 20 MHz Spectrum Mask

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 20 MHz Spectrum Mask STA Transmit Power class Permitted power spectrum density, d. Br 10 MHz BW 20 MHz BW +/-0. 5 MHz from edge +/5 MHz from edge +10 MHz from edge +0. 5 MHz from edge (*) +10 MHz from edge Class A -20 -28 -40 -15 -23. 5 -28 Class B -20 -28 -40 -18 -23. 5 -28 Class C -32 -40 -50 -29 -35. 5 -40 Class D -45 -55 -65 -40 -49. 4 -55 Note: * interpolated value from linear region • Existing 11 p 20 MHz spectrum mask is relatively relaxed than 10 MHz spectrum mask, with more spectrum leakage power. • Tightening the 20 MHz spectrum mask for 11 bd can allow better adjacent channel operation. • Submission Define new 20 MHz spectrum mask to maintain similar power leakage as 10 MHz mask. Slide 10 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 20 MHz OFDM Numerology

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 20 MHz OFDM Numerology • Option 1: Define tone plan over entire 20 MHz bandwidth, • For example, 11 ac 40 MHz with DC 2. • Option 2: 11 bd 10 MHz + 11 bd 10 MHz Submission Slide 11 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 20 MHz OFDM Numerology

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 20 MHz OFDM Numerology (cont. ) • Option 1 requires much sharper Tx filter to achieve the 20 MHz mask • ~4% better OFDM efficiency compared to Design 2. • Option 2 “ 10 MHz + 10 MHz” enables implementation flexibility to meet the tightened 20 MHz mask. • Design A: Reuse 10 MHz signal generation path, and combine two 10 MHz signals either in digital domain or analog domain. • Spectrum mask can be readily met by reusing 10 MHz signal generation. • Design B: Directly generate the signal using 20 MHz IFFT, same as option 1. Submission Slide 12 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Summary • In this

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Summary • In this contribution, we investigated the OFDM numerology choices for 10 MHz and 20 MHz 11 bd PPDU. • 11 ac 20 MHz DC 2 is the best candidate for 10 MHz 11 bd PPDU. • In order to enable 20 MHz 11 bd operation, tightened spectrum mask may be needed. • 20 MHz 11 bd PPDU can use 10 MHz + 10 MHz OFDM numerology. Submission Slide 13 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Reference [1] Rui Cao

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Reference [1] Rui Cao and etc. , “Potential PHY Designs for NGV”, IEEE 802. 11 -19/0016. [2] Dongguk Lim and etc. , “PHY Design for 11 bd”, IEEE 802. 11 -19/0332. [3] Li Nan, and etc. , “Simulation of Potential PHY Technology for NGV”, IEEE 11 -19/0393. Submission Slide 14 Rui Cao and etc. , Marvell

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Straw Poll 1 Do

May 2019 doc. : IEEE 802. 11 -19/0686 r 2 Straw Poll 1 Do you agree to add the following text into Section 3 of SFD? • 10 MHz 11 bd Data symbol shall use 11 ac 20 MHz OFDM numerology. Y: 19 N: 0 A: 12 Submission Slide 15 Rui Cao and etc. , Marvell