Design Considerations of DL Data Rate and SYNC for IEEE 802.11-24
Explore the design considerations for DL data rate and SYNC proposals within IEEE 802.11-24 standard, focusing on low-power tag hardware characteristics, mono-static backscattering tag concepts, and SYNC field design for AMP DL PPDU format. The presentation delves into SYNC field requirements, pulse durations, data rates, Manchester coding, and synchronization considerations for efficient AMP tag design.
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November 2024 doc.: IEEE 802.11-24/1797r0 Design Considerations of DL Data Rate and SYNC Date: 2024-11-09 Authors: Name Affiliations Address Phone email NXP Rui Cao 350 Holger Way, San Jose, CA 95134 rui.cao_2@nxp.com Somayeh Khosroazad Xilin Cheng somayeh.khosroazad@nxp.co m xilin.cheng@nxp.com Hongyuan Zhang hongyuan.zhang@nxp.com Franz Amtmann Mikron-Weg 1, 8101 Gratkorn, Austria franz.amtmann@nxp.com Peter Th ringer peter.thueringer@nxp.com Submission Slide 1 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 Introduction The low power tag hardware characteristics have been discussed and compared [1, 2] More relaxed design is needed to accommodate and facilitate ambient power device design In this presentation, we continued the discussion on the DL data rates and SYNC design proposals. Submission Slide 2 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 Recap: Mono-static Backscattering Tag [2] AMP + UHF: one tag for both B2B and B2C applications 900MHz + 2.4GHz AMP Logic Antenna Z_ant Modul ator Memory RFID Logic B2B: sub-1GHz backscattering with ~10m range B2C: 2.4GHz backscattering with ~10cm range AMP mono-static backscattering tag should share common or similar RF/hardware requirements Submission Slide 3 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 SYNC design In Sept. meeting, SYNC field is agreed to be part of the DL PPDU format Initial synchronization of AMP DL PPDU Manchester coding for DL PPDU data portion A shorter SYNC than 11ba is suggested in [3], to cover all integrated energizer case with up to 70dB link budget SNR is not the limitation factor Submission Slide 4 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 DL PPDU Rx for AMP Tag Design requirement for backscattering Tag Rx [2]: At least 2us pulse duration Limitation due to envelope detector sensitivity and 2MHz clock rate Each pulse of SYNC field needs to be at least 2us 250kbps max data rate with Manchester coding 100k ppm requires per-pulse synchronization SYNC design: Low false trigger rate on data portion with Manchester coding Invalid Manchester code, e.g. 3 consecutive ON/OFF pulses Limited consecutive OFF pulses to avoid regular WiFi receiver: suggested max 3 OFF pulses same as WUR SYNC Zero-DC to simplify Rx design Good cross-correlation properties Slide 5 Submission Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 SYNC Sequences Sequence 1: [0 1 1 1 0 1 0 0 0 1 1 1 0 0 0 1] Sequence 2: [1 1 0 1 0 0 0 1 1 0 0 0 1 1 1 0] Sequence 3: [1 1 0 0 0 1 0 1 1 1 0 0 0 1 1 0] Submission Slide 6 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 SYNC Performance Simulation settings: 2MHz Tag Rx nominal clock rate Tag clock ppm: [0, +/-10k, +/-50k, +/-100k] ppm SYNC performance waveform: 160 Manchester Encoded data bits (250kbps) + SYNC Rx SYNC detection: Counter based per-bit transition detection Pmiss: miss detection probability of SYNC Reference Manchester data performance: no initial timing estimation SNR = ON pulse power noise power AWGN channel Note: SYNC sequence 2 Submission Slide 7 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 Performance SYNC 1% Pmiss SNR requirement matches with 250kbps PER Note: Pfalse = 0 Submission Slide 8 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 Discussions SNR = 16dBm [3] Pathloss (db) (-85dBm) Noise floor = -95dBm (80MHz BW) Noise figure: 10dB Sensitivity of ~9dB for 100k ppm Maximum supported pathloss = 92dB The supported range can be even longer with advanced preamble detection Length 16 SYNC is sufficient to support main use cases Submission Slide 9 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 Summary Discuss AMP DL PPDU SYNC design requirement Minimum 2us pulse width Bit-level synchronization Invalid code for avoid false trigger in Manchester data portion Several SYNC design proposals and performance evaluation Length 16 SYNC is sufficient to support the link budget requirement Submission Slide 10 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 References [1] 11-24/1475, Discussion on ultra-low power timing clock [2] 11-24/1237, AMP-Tag-requirements-for-Mono-static- Backscattering [3] 11-24/1163, WUR for Integrated Energizer Case [4] EPC UHF Gen2 Air Interface Protocol | GS1 Submission Slide 11 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 SP Do you agree to add the following to TGbp SFD? AMP DL PPDU SYNC field is defined based on pulse duration of 2us? Submission Slide 12 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 SP Do you agree to add the following to TGbp SFD? AMP defines one data rate of 250kbps for DL transmission? Submission Slide 13 Rui Cao, etc. (NXP)
November 2024 doc.: IEEE 802.11-24/1797r0 SP Do you agree to add the following to TGbp SFD? AMP DL PPDU defines SYNC of length 16? Submission Slide 14 Rui Cao, etc. (NXP)
