Boundaryless Visible Light Communication System Without Attocell for Industrial Internet of Things

Recently, visible light communication (VLC) in the industrial Internet of Things has been widely concerned. In these systems, multi-access technologies are always used to eliminate interference between adjacent transmitters, significantly decreasing transmission efficiency. Meanwhile, the attocell boundaries caused by multi-access technologies can also limit communication coverage and lead to frequent receiving switches. To overcome these weaknesses caused by the division of attocell, we design a boundaryless none-attocell VLC system in this paper. In the proposed system, each transmitter uses all available communication resources, and a cubic receiver is adopted to receive in both non-overlapping and overlapping areas. Specifically, we propose a scheme for adaptive signal selection, enabling the receiver to select the recoverable transmitting signals. After that, we introduce an adaptive channel estimation and signal recovery method, which adaptively achieves signal combining and overlapping signal recovery. Our simulations verify the proposed scheme and demonstrate that the proposed system with the adaptive receiving scheme has better error performance and broader communication coverage than the traditional attocell system.