Abstract
The visible light communication (VLC) systems are generally considered secure since the light cannot penetrate through solid objects. However, both in the line of sight (LoS) scenarios as well as in non LoS scenarios with wide and strong optical signal, information security must be considered. The conventional information security technologies used for wireless communications based on radio frequency are not suitable to be applied straight for VLCs because of the limited hardware resources, especially for the optical receivers (oRx). In this paper, a study on the VLC security at the physical layer approach based on optical beamforming to achieve secure transmissions for indoor and underground scenarios is presented.
Highlights
The visible light communication (VLC) systems are generally considered secure since the light cannot penetrate through solid objects
There was a VLC kit offered for sale that raised an unexpected interest and the development team found that they were out of stock in a surprisingly short time after launching the product
Following the Nobel Prize awarded in 2014 to the researchers who discovered the white LED [3], the research regarding the VLC deployments have raised with the same speed as the electronic parts with low costs were improved and became available for research teams and to design and develop systems ready to be applied in a number of areas
Summary
The academic community agrees that the VLC technology development started with the demonstration of a reliable indoor wireless transmission system, in Japan, in 2001 [1]. There was a VLC kit offered for sale that raised an unexpected interest and the development team found that they were out of stock in a surprisingly short time after launching the product. Following the Nobel Prize awarded in 2014 to the researchers who discovered the white LED [3], the research regarding the VLC deployments have raised with the same speed as the electronic parts with low costs were improved and became available for research teams and to design and develop systems ready to be applied in a number of areas. Despite the major drawbacks that the currently LEDs have, for fast transmission and a long-range optical link communication in VLC systems, the limited bandwidth (up to about 20MHz) and non-linearity, since 2001 to date, there are more and more systems and new coined wireless communication technologies based on the visible light. The Free Space Optics (FSO) technology is applied in outdoor environments and recently is intensively researched and developed for the vehicle to vehicle (V2V) communication [7,8] and underwater transmission [9,10], as well
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