Visible light communication based system using high power LED and dicode pulse position modulation technique

Abstract

-In this paper a dicode pulse position modulation (DiPPM) technique has been successfully implemented for an indoor visible light communication (VLC) based system using an FPGA and a commercial high power white LED (30 W). A data rate of 13 Mbps has been achieved with a bit error rate (BER) <10 -11 at a free space distance of 1.2 m through a basic transceiver circuit, and 14.5 Mbps with 1.15x10 -6 of BER. Furthermore, a data rate of 13 Mbps has been successfully transmitted over a distance of 1.8 m with BER of 10 -5 . This proves that the application of DiPPM is a viable modulation system over free space communication links.

Comparison between dicode PPM and offset PPM enhancement with different error correction codes

“…In the iterative parity check decoder, there are two categories of judgments: Soft and hard. The Sum–Product Method is a message‐passing soft choice system wherein the probability of former channel information is represented by the input of each received bit [19]. The Sum–Product Method is classified as Probability Domain, Log Domain, or Min‐Sum SPA, according to the message building between the variables and check nodes.…”

Realization of real‐time OFDM‐based visible light communication using an InGaN/GaN multiquantum‐wells LED

“…[2][3][4] However, commercial white-light LED has a limited bandwidth of about 3 MHz, which constrained the rate of VLC. 5 To deal with this situation, several technologies have been suggested, such as designing new LED structure, 6,7 extending bandwidth by using pre-emphasis and equalization method, 8 employing high spectral-efficiency modulation, [9][10][11] and using wavelength-division multiplexing technology. 12 Previous works of VLC system can be separated into two research directions 13 : off-line VLC and real-time VLC.…”