Authors Date 202009 September 2020 Ardimas Purwita University of Edinburgh Slide 1 Abstract This presentation reviews the proposals and related work on the optimal center frequency for the common mode mandatory PHY of ID: 1045663
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1. Proposals and related work on Center Frequency for the Common Mode Mandatory PHYAuthors:Date: 2020-09September 2020Ardimas Purwita (University of Edinburgh)Slide 1
2. AbstractThis presentation reviews the proposals and related work on the optimal center frequency for the common mode mandatory PHY of TGbb. Documents IEEE 802.11-20/0572r1 and IEEE 802.11-20/1037r0 are reviewed. Slide 2Ardimas Purwita (University of Edinburgh)September 2020
3. Ardimas Purwita (University of Edinburgh)April 2020September 2020Ardimas Purwita (University of Edinburgh)Slide 3
4. EVM TestSlide 4Ardimas Purwita (University of Edinburgh)September 2020Constellation referenceEstimated symbols from equalizerCalculate EVM(Eq. 28-127 in IEEE P802.11ax™/D3)IEEE 802.11-19/0187r4High SNR assumption: limited by freq. selective channels and shot noise
5. Further DiscussionsFor example, with respect to the previous AWGN simulations, we have the EVM in dB for MCS6 as:Slide 5Ardimas Purwita (University of Edinburgh)September 2020fc 10.5 MHz11.5 MHz15 MHz40 MHzEVM (dB)-23.45-29.01-34.95-37.29BETTER
6. Problem FormulationGiven that we are confident with the EVM values, then we can find the optimal frequency as follows:i.e., it is an exhaustive search over CIRs and MCS index values, but the EVM value must be lower than the allowed EVM values that are defined in the 802.11ax documentSlide 6Ardimas Purwita (University of Edinburgh)September 2020fc* = arg min (EVM) for each CIR and MCS index values s.t. the EVM does not exceed the allowed EVM values
7. Our ApproachSlide 7Ardimas Purwita (University of Edinburgh)September 2020Find the knee pointSamples, BW = 20 MHz- - EVM limitInsignificant improvement
8. Snapshot (1)BW = 20 MHzMost channels exhibit the optimal center frequency at 12.45 MHzSlide 8Ardimas Purwita (University of Edinburgh)September 202012.45 MHzheavy tail
9. Snapshot (2)BW = 40 MHzMost channels exhibit the optimal center frequency at 24 MHzSlide 9Ardimas Purwita (University of Edinburgh)September 202024 MHzheavy tail
10. Snapshot (3)BW = 80 MHzMost channels exhibit the optimal center frequency at 47 MHzSlide 10Ardimas Purwita (University of Edinburgh)September 202047 MHzheavy tail
11. Snapshot (4)BW = 160 MHzMost channels exhibit the optimal center frequency at 96 MHzSlide 11Ardimas Purwita (University of Edinburgh)September 202097 MHzheavy tail
12. Observation ResultsSlide 12Ardimas Purwita (University of Edinburgh)September 2020BW [MHz]fc* [MHz]Δ [MHz]2016 (-24.63 dBr)64026 (-22.26 dBr)68046 (-21.11 dBr)616086 (-20.55 dBr)6BW [MHz]fc* [MHz]Δ [MHz]2020 (-28 dBr)104030 (-23.89 dBr)108050 (-21.92 dBr)1016090 (-20.96 dBr)10BW [MHz]fc* [MHz]Δ [MHz]2026 (-33.05 dBr)164036 (-26.35 dBr)168056 (-23.14 dBr)1616096 (-21.56 dBr)16BW [MHz]fc* [MHz]Δ [MHz]2024 (-31.37 dBr)144034 (-25.53 dBr)148054 (-22.73 dBr)14160 94 (-21.36 dBr)14Notes: Red means the corresponding Δ results in an nonoptimal performance. The criterion is based on the following limits, which are based on the intermediate results (see the previous page).{BW,Limit in dBr} = {20 MHz, -21.68 dBr}, {40 MHz, -21.43 dBr}, {80 MHz, -21.32 dBr}, {160 MHz, -21.56 dBr}
13. Experimental validationExperimental validation is done on the center frequency for the common mode mandatory PHY for 20 MHz and 40 MHz channels. September 2020Ardimas Purwita (University of Edinburgh)Slide 13
14. Experimental SetupSlide 14Ardimas Purwita (University of Edinburgh)September 2020802.11acLaptopeth0SBC + RF down-conversionDown-conversion5 GHz bandfcOWC Front-end70 cmPDOscilloscope CPU/host 802.11acUp-conversionfcSBC + RF up-conversioneth0OWC Front-endLaptopCPU/host 5 GHz band
15. Experimental Setup videohttps://photos.google.com/share/AF1QipNTcH1Fe5Yqsj92M-nTI-5Ks7mOoES7_cAVPSmrp2qGaZV5O4sW2eqUEnda-EbKwQ/photo/AF1QipNv5hXvyyJYri_C17R3GPwhMryHYtJgPiYyFurH?key=SXFPdkwwZldoNFFoQWlCNHRQWDNrRHNsTzFqckJn Slide 15Ardimas Purwita (University of Edinburgh)September 2020
16. Initial MeasurementUsing an 802.11ac chipset and a down-conversion, we obtain the following optical spectrum, for example, with fc =12.5 MHz and fc = 111.25 MHz, respectivelySlide 16Ardimas Purwita (University of Edinburgh)September 2020
17. Experimental video for 21 MHz centre freq.https://photos.google.com/share/AF1QipNTcH1Fe5Yqsj92M-nTI-5Ks7mOoES7_cAVPSmrp2qGaZV5O4sW2eqUEnda-EbKwQ/photo/AF1QipPX0cHX0Fjegiyonlfp2iP1PIEUOE8Pl01ld_g8?key=SXFPdkwwZldoNFFoQWlCNHRQWDNrRHNsTzFqckJn Slide 17Ardimas Purwita (University of Edinburgh)September 2020
18. Measurements with BW = 20 MHzNote: Our simulation shows the optimum center frequency of 12.5 MHz based on the knee-point criterion. Slide 18Ardimas Purwita (University of Edinburgh)September 2020fc [MHz]Data rate [Mbps] (1 min measurement)1020-251130125512.5*60-6517702178.55.06 GHz (default)79.5
19. Measurements with BW = 40 MHzNote: Our simulation shows the optimum center frequency of 24 MHz based on the knee-point criterion. Slide 19Ardimas Purwita (University of Edinburgh)September 2020fc [MHz]Data rate [Mbps] (1 min measurement)2040226024*130-14025140-14527145-15034150-1555.06 GHz (default)165
20. ResultsSlide 20Ardimas Purwita (University of Edinburgh)September 2020BW [MHz]fc* [MHz]Δ [MHz]2026 (-33.05 dBr)164036 (-26.35 dBr)168056 (-23.14 dBr)1616096 (-21.56 dBr)16BW = 20 MHzBW = 40 MHzBW = 80 MHzBW = 160 MHzfc=26 MHzfc=36 MHzfc=56 MHzfc=96 MHz
21. ChannelizationBW [MHz]fc [MHz]2026, 46, 66, 146, 166, 186, 206, 226, 246, 266, 286, 306, 326, 466, 486, 506, 526, 546, 566, 586, 606, 6264036, 56, 96, 136, 176, 376, 416, 456, 496 8056, 136, 376, 45616096, 416320176Slide 21Ardimas Purwita (University of Edinburgh)September 2020
22. Straw PollShould TGbb adopt 26 MHz as the center frequencies for the 20 MHz mandatory, common mode PHY of TGbb.Result (Y / N / A): 13 / 0 / 8Slide 22Ardimas Purwita (University of Edinburgh)September 2020
23. MotionSlide 23Ardimas Purwita (University of Edinburgh)September 2020Instruct the Technical Editor to replace the existing content of clause 32.3.2.3.9.4 in draft D0.2 with the following text:“The LC common mode shall operate at a centre frequency of 26 MHz. The common bandwidth shall be 20 MHz. This centre frequency shall correspond to LC channel 0.”Moved: Nikola SerafimovskiSeconded: Result (Y / N / A): / /
24. 32.3.3.3.24 Centre frequencies Slide 24Ardimas Purwita (University of Edinburgh)September 2020The centre frequencies and channel numbering depending on the CBW are shown in Table 1.Table 1 — Channelization Channel numberfc (MHz)Frequency range (MHz)20 MHz40 MHz80 MHz160 MHz320 MHzLC02616-36204080160320LC13616-56 LC24636-5620LC35616-96 LC46656-762040LC57656-96 LC68676-9620LC79616-176 LC810696-116204080LC911696-136 LC10126116-13620LC1113696-176 LC12146136-1562040LC13156136-176 LC14166156-17620LC1517616-336 LC16186176-196204080160LC17196176-216 LC18206196-21620LC19216176-256 LC20226216-2362040LC21236216-256 LC22246236-25620LC23256176-336 LC24266256-276204080LC25276256-296 LC26286276-29620LC27296256-336 LC28306296-3162040LC29316296-336 LC30326316-33620
25. MotionSlide 25Ardimas Purwita (University of Edinburgh)September 2020Instruct the Technical Editor to replace the existing content of clause 32.3.3.3.24 in draft D0.2 with the content from slide 24.Moved: Nikola SerafimovskiSeconded: Result (Y / N / A): / /