A-QL (Asynchronous Quick-Link) is a Screen-2-Camera operating mode being standardized at the IEEE 802.15.7m. This post introduces the BER measurement method and the performance of A-QL system. See this video demo for the BER measurement scenario: https://www.youtube.com/watch?v=Mkq2lYKzQsQ Experimental Setup The scenario for measuring BER is illustrated in Figure 1. The bit rate is measured … Continue reading A-QL: Part 2 -BER Measurement
A-QL (Asynchronous Quick-Link) is a Screen-2-Camera operating mode being standardized at IEEE 802.15.7m. This post describes what it is for and how it operates. Figure 1 - Example of color code displaying with video on a screen And before we start talking about A-QL system, a short demo of it is here: https://www.youtube.com/watch?v=B6uBTSdh44Y Introduction The … Continue reading A-QL: Part 1- Introduction of Reliable Screen-Camera Communication
The classification of OCC technologies has been given. Being a part of non-flicker modulation series, with the vast usage of rolling shutter cameras in the camera market, the use of rolling shutter cameras in OCC systems takes advantage of the high sampling rate of the rolling shutter mechanism, which sequentially exposes pixel lines to the … Continue reading Rolling shutter OCC: Communication distance vs Data rate Trade-off
C-OOK stands for Camera ON-OFF Keying, is also an operating mode being standardized in IEEE 802.15.7m. This post reviews the operation of this mode and highlights its characteristics. See video demo 1 (Manchester coded for Rolling shutter OCC): https://www.youtube.com/watch?v=tMaR7B5M3QI See video demo 2 (4B6B coded for Rolling shutter OCC): https://www.youtube.com/watch?v=wPbeZZxEMVY C-OOK for OCC and its … Continue reading C-OOK: Customizing OOK for Optical Camera Communication
CM-FSK stands for Camera M-ary Frequency Shift Keying, is also an operating mode being standardized in IEEE 802.15.7m. This post reviews the operation of this mode and highlights its characteristics. See video demo 1 to have a brief understanding of CM-FSK System: (7m transmission) https://www.youtube.com/watch?v=cUt5zbRSyoQ Also, video demo 2 (35m transmission distance): https://www.youtube.com/watch?v=BVqh570bCRY&t=5s FSK … Continue reading CM-FSK: Customizing FSK for Optical Camera Communication
Reed Solomon and Convolutional Code are chosen for IEEE 802.15.7-2011 and IEEE 802.15.7m implementation. In this post, we will review the generation of the codes and simulate their performance for comparison. Reed Solomon Systematic RS codes are used for FEC (typically outer FEC) with GF(16), generated by the polynomial x4+x+1. The generators for the RS(n, … Continue reading FEC: Generation of Reed-Solomon and Convolutional Code
Hi there! Two weeks busy in writing an SCI paper is over, and I am back beginning with a list of notations and acronyms that I usually use in OCC systems from now on. ACO-OFDM Asymmetrically Clipped OFDM Ab … Continue reading Abbreviation in OCC Systems
In the context of a safety assistance communication-based solution, OWC is a strong candidate for delivering the V2V communication power to cars. It is realized that the LED lighting is quipped to car mandatorily, meanwhile, a camera is considered as one of the indispensable sensors for car vision. The existence of supportive infrastructure enables the … Continue reading What is Optical Region-of-Interest Signaling?
This post briefly reviews the current status of standardization groups within IEEE 802.15 There are IEEE standards covering the optical spectrum, IEEE 802.15.7-2011 std., known as VLCIEEE 802.15.7m std., (publication in 2018, as expected), including OCC modesIEEE 802.15.13 std., (ongoing), adding LiFi (IEEE 802.15.7-2011 std. is also the base document as IEEE 802.15.7m)IEEE 802.11, introducing LiFi to 802.11IEEE 802.15 … Continue reading A comparison between OCC standardization groups within IEEE 802.15
PHY operating modes The latest IEEE 802.15.7m draft standard (until Aug. 2018) is on the Sponsor Balloting recirculation. This version has updated a lot in compared to the previous version before LiFi modes are moved to new task group under IEEE 802.15. A list of operating modes between two drafts is a good start. Notation … Continue reading PHY modes within IEEE 802.15.7m draft – a quick review
OWC Standards under IEEE 802 There are IEEE standards covering the optical spectrum, IEEE 802.15.7-2011 std., known as VLC IEEE 802.15.7m std., (publication in 2018, as expected), including OCC modes IEEE 802.15.13 std., (ongoing), adding LiFi (IEEE 802.15.7-2011 std. is also the base document as IEEE 802.15.7m) IEEE 802.11, introducing LiFi to 802.11 IEEE 802.15 … Continue reading OCC Standardization Roadmap
Figure 1 - Examples of promising use cases using OCC Various application fields of OCC include Indoor lighting Digital Signage Traffic lighting, V2V, V2X Interactive Display with Screen Augmented Reality experience with Smartphones There are plenty of promising applications with OCC. I have drawn several illustrations to explain "where OCC can be used" and "how … Continue reading OCC Use Cases/ Promising Services
Table 1- Classification of OCC, its expected performance, and intended usages Given that various modulation schemes for OCC systems have been investigated till the date, the proper modulation scheme should depend on both Tx and Rx. Table 1 suggests to classify OCC schemes into four categories under the following considerations: (i) The method by which … Continue reading Classification of OCC Technologies
Figure 1- Example of OCC promising services (a) OCC vehicular use case. (b) OCC indoor use case OCC: Optical Camera Communication VLC: Visible Light Communication LiFi: Light Fidelity OWC: Optical Wireless Communication What is Optical Camera Communication? OCC aims to deliver data from the light source(s) to the camera. Artificial lights (LED light) are available everywhere human being … Continue reading What is Optical Camera Communication?
Thanks for joining me! It is my pleasure to be a part of IEEE 802.15.7m standard. Since I have just graduated from Kookmin, I have some free time to create this blog and share my perspective on the current status of Optical Camera Communication (OCC) technologies. I would be nice if I could share not … Continue reading The Journey to Optical Camera Communication Begins