Flicker Mitigation Solutions in IEEE802.15.7 PHYs

Flicker mitigation solutions for PHYs in IEEE802.15.7 were proposed by Sang-Kyu Lim and Tae-Gyu Kang from ETRI. The solutions address issues related to intra-frame flicker, inter-frame flicker, dimming support, and modulation schemes. Techniques such as RLL codes, Manchester coding, and PPM modulation were discussed to reduce flicker effects in wireless personal area networks.

• Flicker Mitigation
• IEEE802.15.7
• PHYs
• Wireless Networks
• Modulation Schemes

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1. July 2017 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) doc.: IEEE 802.15-17-0445-00-0013 Submission Title: Flicker mitigation solutions of PHYs in IEEE802.15.7 Date Submitted: 15 July 2017 Source: Sang-Kyu Lim and Tae-Gyu Kang [ETRI] Address: Voice:[+82-42-860-1573], FAX: [+82-42-860-5218], E-Mail:[sklim@etri.re.kr] Re: Abstract: Purpose: Contribution to IEEE 802.15.13 Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Submission Slide 1 Sang-Kyu Lim (ETRI)

2. July 2017 doc.: IEEE 802.15-17-0445-00-0013 Flicker Mitigation Solutions of PHYs in IEEE802.15.7 Sang-Kyu Lim and Tae-Gyu Kang ETRI Submission Slide 2 Sang-Kyu Lim (ETRI)

3. July 2017 doc.: IEEE 802.15-17-0445-00-0013 VLC Characteristics distinguished from Other Communication System Flicker Mitigation Schemes Dimming Support Submission Slide 3 Sang-Kyu Lim (ETRI)

4. July 2017 doc.: IEEE 802.15-17-0445-00-0013 PHY Types in IEEE 802.15.7 < PHY I > < PHY II > < PHY III > Submission Slide 4 Sang-Kyu Lim (ETRI)

5. July 2017 doc.: IEEE 802.15-17-0445-00-0013 Flicker Issue Flicker is defined as the fluctuation of the brightness of light that can cause noticeable physiological changes in humans. Intra-frame Flicker Inter-frame Flicker Data Frame Data Frame Data Transmission Time Idle Time Data Transmission Time Submission Slide 5 Sang-Kyu Lim (ETRI)

6. July 2017 doc.: IEEE 802.15-17-0445-00-0013 Solutions for Flicker Mitigation RLL Codes Manchester 4B6B Intra-Frame Flicker 8B10B Dimming Support Solutions Variable- PPM Modulation Scheme Idle Pattern & Compensation Time Inter-Frame Flicker Visibility Pattern Submission Slide 6 Sang-Kyu Lim (ETRI)

7. July 2017 doc.: IEEE 802.15-17-0445-00-0013 Manchester Code Expands each bit into 2-bit symbols Same average brightness Flicker mitigation effect DC balancing code Strong clock spectral line Optical Power Optical Power = 50 % = t t T T bit 0 bit 1 Manchester - OOK Submission Slide 7 Sang-Kyu Lim (ETRI)

8. July 2017 doc.: IEEE 802.15-17-0445-00-0013 4B6B Code Expands 4-bits to 6-bits symbols Counts of 1 and 0 = 3 Same average brightness Flicker mitigation effect DC balancing code Strong clock spectral line 4B 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 6B 0 1 2 3 4 5 6 7 8 9 A B C D E F 001110 001101 010011 010110 010101 100011 100110 100101 011001 011010 011100 110001 110010 101001 101010 101100 Submission Slide 8 Sang-Kyu Lim (ETRI)

9. July 2017 Simulation Results of 4B6B Code doc.: IEEE 802.15-17-0445-00-0013 4B6B Spectrum 10 5 0 dBr relative to noise PSD -5 -10 -15 -20 -25 -30 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Normalized Frequency wrt Chip Rate DC Balancing Code: YES Spectrum at 0.05 Hz: -12 dBr DC residual: -infinity (perfect balance) Clock Strength: +21 dBr @ 2/3 Hz (Reference : IEEE 802.15-09-0766-00-0007) Submission Slide 9 Sang-Kyu Lim (ETRI)

10. July 2017 doc.: IEEE 802.15-17-0445-00-0013 8B10B Code The low 5 bits of data are encoded into a 6-bit group The top 3 bits are encoded into a 4-bit group The long-term ratio of 1s and 0s transmitted is exactly 50%. DC balancing code Strong clock spectral line (Reference : IEEE 802.15-09-0637-00-0007 and IEEE 802.15-09-0766-00-0007) Submission Slide 10 Sang-Kyu Lim (ETRI)