3-Gbit/s Indoor Visible Light Communications Using Optical Diversity Schemes


A three-Gb/s high-speed indoor visible lightweight communication system using optical diversity schemes is presented. A double optical diversity (DOD) theme in time and frequency is employed with choice combining (SC) on the premise of red, inexperienced, and blue (RGB) light-emitting diodes (LEDs). Within the proposed scheme, the initial information and the delayed versions of this data are transmitted simultaneously by multiplying with orthogonal frequency in order to make diversity effect over the transmission. Additionally, RGB LEDs are used for parallel transmission of knowledge, so resulting in an increase in the info speed. At the receiver, color filters are used to filter out for the desired signal, and SC is performed to obtain the most probable bits. Simulation results demonstrate that the proposed theme is sturdy and economical to overcome the impact of multiple reflections with a link margin of approximately ten dB, as compared with a conventional on–off keying (OOK) modulation scheme at a small amount error rate (BER) of . Moreover, the scheme achieves a knowledge rate of 3 Gb/s with a BER of at a symptom-to-noise ratio (SNR) price of 3.6 dB over most locations in an indoor visible light communication (VLC) surroundings.

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