Proposal for Integration of PHY Layer Enhancement in IEEE 802.11 Standards
This proposal suggests integrating a new PHY layer to improve throughput and robustness in frequency-selective channels, complementing existing IEEE 802.11 specifications. The document outlines the characteristics, options, and feasibility of applying the proposed enhancements within the framework of IEEE standards.
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doc.: IEEE 802.11-19/0847r1 May 2019 TGbb PHY proposal Date: April 24, 2019 Authors: Name Company Email Nikola Serafimovski pureLiFi nikola.serafimovski@purelifi.com Chong Han pureLiFi chong.han@purelifi.com Gerard Oregon Gigalifi Gerardo_ho@hotmail.com Submission Slide 1 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Abstract This presentation aims to provide a suggestion on the integration of a PHY layer that could enable existing .11 PHY specifications to be applied for LC as well as the introduction of a new LC PHY to provide enhanced optimization for higher throughput and enhanced robustness in frequency- selective channels. Submission Slide 2 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Introduction TGbb pre-proposal was discussed in do. 11-19/0388r0. Submission Slide 3 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 LC PHY Options Existing 802.11 PHY - 20-160 MHz - bit-interleaved coded modulation - existing IEEE 802.11 technology - more advanced MIMO schemes LC-optimized PHY - 25 200 MHz - closed-loop adaptive bitloading - existing ITU-T G.vlc technology - good performance in frequency- selective channel - needs liaison btw. IEEE and ITU-T Main difference Pro Con - suboptimal performance in frequency-selective channel Submission Slide 4 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Characteristics of LC PHYs LC requires a non-negative and real-valued baseband-signal. Bipolar signals can be turned non-negative by adding a DC- bias before transmission. optical channel + RX DSP TX DSP Driver & LED High- pass Photo- diode DC It is removed by using a high-pass filter before reception. Submission Slide 5 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Option 1) Use existing 802.11 PHYs for LC Complex OFDM-baseband signals are real-valued after up- conversion to the carrier frequency fc. Up-con- version Data LED Re(.) CP IFFT fc For LC, one could simply change fcto a low carrier ( low IF ), yielding a real-valued baseband signal. Submission Slide 6 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Using existing 802.11 PHYs for LC (2) RF frontend up-converts baseband signals onto e.g. fc=2.4 GHz. LC frontend up-converts baseband onto low IF e.g. fc=BW/2 + . is to be agreed depending on signal mask design. This way, any complex-valued baseband signal (i.e. any existing IEEE 802.11 PHY) can be used to facilitate LC. Submission Slide 7 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 PROPOSAL: Baseband-offset ( ) Straw Poll: Should the mandatory baseband offset ( ) for existing 802.11 PHY modes as described in Slide 6 be set to 1.5 MHz for TGbb? Y/N/A 3 / 5 / 9 Submission Slide 8 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Option 2) Use a LC-optimized PHY The LC-optimized PHY benefits from adaptive bitloading Adaptive bitloading is widely used in LC R&D papers Brings enhanced mobility support and optimized PHY performance Seamless operation in both, LOS and NLOS channel conditions Ways to bring adaptive bitloading into 802.11 Integrate G.hn as LC-optimized PHY under 802.11 MAC Submission Slide 9 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 Use existing and LC-optimized PHY under 802.11 MAC 802.11 MAC could integrate existing and optimized PHY 802.11 MAC LC-Optimized PHY Existing PHY for LC Use existing 802.11ax PHY as a common, mandatory OFDM PHY. Negotiate the use of the LC-optimized PHY if both devices have that capability. Submission Slide 10 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 PROPOSAL: Use 11ax PHY as the common-mode for TGbb Straw Poll: Should the 11ax (High Efficiency PHY specification) be used as a mandatory, common-mode for TGbb? Y/N/A 1 / 7 / 10 Submission Slide 11 Nikola Serafimovski (pureLiFi)
doc.: IEEE 802.11-19/0847r1 May 2019 References [1] V. Jungnickel, V. Pohl, S. Nonnig and C. von Helmolt, "A physical model of the wireless infrared communication channel," in IEEE Journal on Selected Areas in Communications, vol. 20, no. 3, pp. 631- 640, April 2002. https://mentor.ieee.org/802.11/dcn/18/11-18-1237-02-00bb-ieee-802- 11bb-reference-channel-models-for-vehicular-communications.pdf ITU-T recommendation G.9660-2015 P. W. Berenguer, V. Jungnickel and J. K. Fischer, "The frequency-selective rate adaptation communications," 2016 10th Communication Systems, Networks and Digital Signal Processing (CSNDSP), Prague, 2016, pp. 1-6. [2] [3] [4] benefit of for optical Symposium wireless International on Submission Slide 12 Nikola Serafimovski (pureLiFi)
