Long-Range Backscatter Device Capabilities Overview
This document discusses the capabilities of long-range backscatter devices in IEEE 802.11 networks, focusing on specific features required for enabling long-range backscatter modes and implications for transmitter and receiver capabilities.
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March 2025 doc.: IEEE 802.11-25/0268r0 Long-Range Backscatter Device Capabilities Date: 2025-03-10 Authors: Name Nelson Costa Affiliations Address Phone email nelson@haila.io Suite 403, 460 Saint- Catherine St. W. Montreal, QC. Canada vytas@haila.io Vytas Kezys HaiLa Technologies kamran@haila.io Kamran Nishat pbower@haila.io Patricia Bower Submission Slide 1 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Abstract This presentation is a follow-on to 25/0267, SFD Review for Long-Range Backscatter. In that presentation, We identified the features implied by the SFD as related to the receiver and transmitter capabilities of a Backscatter non-AP AMP STA. We discussed gaps in the current SFD for both close-range and long-range backscatter applications. Here, we present an example scenario for both long-range and close-range backscatter modes. Submission Slide 2 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Background In trying to define a long-range backscatter mode, and on further discussion, the group still had some questions. What specific SFD features would be required to enable a long-range backscatter mode? Combined channel shifting and bit flipping. (SSB and PSK modulation in the Uplink) 1 Mb, 2 Mb DSSS in the AMP Excitation field [3-4] This (and previous) presentations Medium protection mechanisms for long range backscatter [5] Submission Slide 3 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Putting It All Together Submission Slide 4 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Putting It All Together (2) Submission Slide 5 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Putting It All Together (3) Submission Slide 6 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Putting It All Together (4) Submission Slide 7 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Putting It All Together (5) Submission Slide 8 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation Submission Slide 9 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation (2) Submission Slide 10 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation (3) Submission Slide 11 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation (4) Submission Slide 12 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation (5) Submission Slide 13 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation (6) Submission Slide 14 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 SSB & PSK Backscatter Modulation (7) Submission Slide 15 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0266r0 Device Capabilities Summary Submission Slide 16 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Conclusion In this presentation, we covered an example exchange for the long-range and close-range backscatter modes. The examples referred to features implied in the current draft SFD. We also discussed the proposed capabilities required for long-range backscatter. SSB or channel center frequency shifting for greatly increased link margin. PSK data modulation for higher receive sensitivity versus OOK. Pre-formed coherently modulated DSSS PPDU in the Excitation field, complete with training for long-range bistatic backscatter applications. Submission Slide 17 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 Straw Polls SP1: Do you agree to add the following content to TGbp SFD? 11bp defines at least one backscattering mode that supports using DSSS within the Excitation field of an AMP DL PPDU. Submission Slide 18 Nelson Costa (HaiLa Technologies)
March 2025 doc.: IEEE 802.11-25/0268r0 References [1] Qi, Yinan, Specification framework for TGbp, 11-24/1613, September 2024. [2] Costa et al., SFD Review for Long-Range Backscatter, 11-25/0267, March 2025. [3] Costa et al., PSK Modulation for Long-Range Backscatter, 11-25/0266, March 2025. [4] Costa et al., Single Side Band Backscatter Modulation, 11-25/0265, March 2025. [5] Nishat et al., Long-range Backscatter Protection Mechanisms, 11-25/0264, March 2025. [6] M. Zgaren et al., "EPC Gen-2 UHF RFID tags with low-power CMOS temperature sensor suitable for gas applications," 2016 14th IEEE International New Circuits and Systems Conference (NEWCAS), Vancouver, BC, Canada, 2016, pp. 1-4. Submission Slide 19 Nelson Costa (HaiLa Technologies)
