Experimental investigation of analog and digital dimming techniques on photometric performance of an indoor Visible Light Communication (VLC) system

Fahad Zafar, Vineetha Kalavally, Masuduzzaman Bakaul, Rajendran Parthiban

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)


For making commercial implementation of light emitting diode (LED) based visible light communication (VLC) systems feasible, it is necessary to incorporate it with dimming schemes which will provide energy savings, moods and increase the aesthetic value of the places using this technology. There are two general methods which are used to dim LEDs commonly categorized as analog and digital dimming. Incorporating fast data transmission with these techniques is a key challenge in VLC. In this paper, digital and analog dimming for a 10 Mb/s non return to zero on-off keying (NRZ-OOK) based VLC system is experimentally investigated considering both photometric and communicative parameters. A spectrophotometer was used for photometric analysis and a line of sight (LOS) configuration in the presence of ambient light was used for analyzing communication parameters. Based on the experimental results, it was determined that digital dimming scheme is preferable for use in indoor VLC systems requiring high dimming precision and data transmission at lower brightness levels. On the other hand, analog dimming scheme is a cost effective solution for high speed systems where dimming precision is insignificant.
Original languageEnglish
Title of host publicationProceedings of SPIE: Fourteenth International Conference on Solid State Lighting and LED-based Illumination Systems
EditorsMatthew H Kane, Jianzhong Jiao, Nikolaus Dietz, Jian-Jang Huang
Place of PublicationWashington USA
Pages1 - 8
Number of pages8
ISBN (Print)9781628417371
Publication statusPublished - 2015
EventInternational Conference on Solid State Lighting and LED-based Illumination Systems 2015 - San Diego, United States of America
Duration: 12 Aug 201513 Aug 2015
Conference number: 14th
https://spie.org/Publications/Proceedings/Volume/9571?SSO=1 (Proceedings)


ConferenceInternational Conference on Solid State Lighting and LED-based Illumination Systems 2015
Country/TerritoryUnited States of America
CitySan Diego
Internet address

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