doc.: IEEE Submission September 2009 Roberts [Intel] Slide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: OOK For VLC Link Establishment Date Submitted: September 2009 Source: Rick Roberts [Intel Corporation] Address: Voice: , Re: Abstract:A VLC source must have intensity to be useful, but it is not required to be emitting any particular color; therefore, intensity modulation via OOK is the most fundamental modulation format and can be used with any VLC source. In this contribution it is suggested that OOK be used for VLC link establishment before switching to an alternate modulation format. Purpose: Notice:This document has been prepared to assist the IEEE P 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 P

doc.: IEEE Submission September 2009 Roberts [Intel] Slide 2 OOK for link establishment 1. Intensity modulation via OOK does not require a priori knowledge of the source color. 2. Many applications are monochromatic in nature and do not require an RGB tri-color LED. 3. Some applications are not color stable (such as LCD displays) and the emitted color rapidly changes. 5. All VLC sources and VLC receivers can support OOK, but not all can support modulation based upon transmitting and receiving different colors.

doc.: IEEE Submission September 2009 Roberts [Intel] Slide 3 Use OOK for Link Establishment Therefore, it is suggested that we use OOK for discovery, association, authentication, and link establishment (reading the headers). After reading the capability fields, and finding out which devices can support CSK (color shift keying – e.g. CCM), an appropriate switch can be made to CSK for the rest of the packet exchanges.

doc.: IEEE Submission September 2009 Roberts [Intel] Slide 4 Relevance of light “band plans” to OOK implementations In regards to band plans that divide up the visible light spectrum into multiple operating bands, the following options should be available: TX using all bands – this will be the case for LCD displays that are modulating the LED back lighting in an uncoordinated manner with respect to the video content. RX using all bands – this will be the case when either no optical filter is used or a visible light optical filter is used (i.e. ingesting the entire VL band). This case covers the circumstance when a low cost receiver implementation has no a priori knowledge of what color the transmitter is going to use for OOK. Assume Wideband Mode during Link Establishment – during link establishment, it will have to be assumed that the TX and RX are operating in the “wideband” mode (using the whole visible light band) until capabilities IEs have been shared. Only after sharing capabilities will a particular device know what the other device is capable of doing.