1. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Output signal specification Date Submitted: 19th May 2010 Source: Clint Chaplin Company Samsung Electronics Address San Jose, California, USA Voice: +1-408-768-0827, FAX:, E-Mail: clint.chaplin@gmail.com Re: N/A Abstract: Suggested resolution to CIDs 517, 519, 529, 530. Purpose:Helping 802.15 TG7 to resolve comments arising from the initial WG ballot 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.

2. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 2 Output Signal Specification Clint Chaplin Samsung Electronics San Jose, California, USA

3. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 3 Reason for specifying output signal The goal of writing standards is so that any entity could build equipment to the standard, and that equipment will interoperate with all other equipment built to the specification that is supposed to interoperate. More specifically, the output signal of the device has to be specified well enough that someone can build a receiver that will successfully receive that signal. Even more specifically, someone building a receiver needs to know how good a receiver they need to design. Stating that the receiver must be able to receive any and all dirty, dim, degraded, and slow signals means that receivers will need to be extremely precise and expensive. Specifying the limits of just how dirty, dim, degraded, and slow an output signal can be will help the receiver designer design a receiver that will be just good enough to receive the signal. The receiver designer is free to design receivers that are better if they want to (business case, etc), but at least the receiver designer will know how good the receiver has to be.

4. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 4 Output signal specifications (not amplitude modulated) Frequency tolerance Clock edge jitter Output signal minimum “on” brightness Output signal maximum “off” brightness Output signal slew rate

5. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 5 Frequency Tolerance Maximum amount actual clock can vary from specified frequency. Clock can vary due to manufacturing variations, aging effects, temperature variation, etc. Usually specified in ppm Suggested 802.15.7 specification: ±100ppm

6. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 6 Clock Edge Jitter Clock edges can jitter due to circuit noise, shot noise, etc. Statistical phenomenon; tends to have a random Gaussian distribution Jitter can be specified either by p-p (14σ) jitter or RMS (1σ) jitter Suggested 802.15.7 specification for 120Mbps: 100ps p-p

7. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 7 Output signal minimum “on” brightness Brightness can be specified as an irradiance at a certain distance from the source. Need to specify the area that the brightness covers (narrow signal vs. wide signal) If specification is met, obviously signal is brighter closer to the source. Proposed 802.15.7 specification: minimum “on” irradiance of x W/m2 between 380 nm and 780 nm over an area of at least y cm x y cm at a distance of z cm. x, y, z needs to be decided.

8. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 8 Output signal maximum “off” brightness Brightness can be specified as an irradiance at a certain distance from the source. Need to specify maximum “off” brightness to guarantee a certain signal swing between “on” and “off” Proposed 802.15.7 specification: maximum “off” irradiance of x W/m2 between 380 nm and 780 nm at a distance of z cm. x, z needs to be decided.

9. doc.: IEEE 802. 15-10-0341-00-0007 Submission to IEEE 802.15.7 May 2010 Clint Chaplin, Samsung ElectronicsSlide 9 Output signal slew rate Need to define the sharpness of the signal transition. Typically defined as a time between 10% and 90% of signal Suggested 802.15.7 specification for 120Mbps: 10% to 90% rise and fall time of 1.5 ns max