Visible light communication (VLC) technology, which provides green lighting and data communication functions, is one of the most vibrant research topics in optical wireless communications. Since the popularity of smartphones, imaging sensor-based VLC (or optical camera communication, OCC) is receiving more and more attention and investigation. Such OCC technology has the ability to separate light signals coming from the different angles of incidence, thus shows an extensive application prospect in many areas. The OCC has lots of differences from the traditional single photodiode-based VLC system, not only in signal processing filed but also in modulation and other domains. Therefore, we have to develop dedicated techniques to support the OCC. This paper reviews some key techniques in OCC system, and discusses the application scenarios of this system.

visible light communication  /  imaging sensor  /  undersampling  /  application scenarios