Abstract
Visible light backscatter (VLB) is an innovative passive transmission paradigm to enable ultra low-power communication and localization for the Internet of Things (IoT), overcoming some limitations of conventional active visible light communication (VLC) as well as active/passive radio-frequency (RF) systems. In this paper, we provide a survey of VLB-based techniques and briefly discuss their applications in healthcare applications. After describing the principles of operation and the main enabling technologies, we survey the existing VLB techniques according to several features, discussing their merits and limitations. Finally, we introduce some open challenges in this area, by delineating future research directions.
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