1-Gb/s Transmission Over a Phosphorescent White LED by Using Rate-Adaptive Discrete Multitone Modulation

Abstract

Light-emitting diodes (LEDs), which will be increasingly used in lighting technology, will also allow for distribution of broadband optical wireless signals. Visible-light communication (VLC) using white LEDs offers several advantages over the RF-based wireless systems, i.e., license-free spectrum, low power consumption, and higher privacy. Mostly, optical wireless can provide much higher data rates. In this paper, we demonstrate a VLC system based on a white LED for indoor broadband wireless access. After investigating the nonlinear effects of the LED and the power amplifier, a data rate of 1 Gb/s has been achieved at the standard illuminance level, by using an optimized discrete multitone modulation technique and adaptive bit- and power-loading algorithms. The bit-error ratio of the received data was 1.5 10^(-3), which is within the limit of common forward error correction (FEC) coding. These results twice the highest capacity that had been previously obtained

Efficient frequency‐domain channel equalisation methods for OFDM visible light communications

“…The orthogonal frequency division multiplexing (OFDM) scheme widely and successfully used in RF systems [8,9] has also been adopted in VLC systems to combat multipath distortion and boost the data rate without any bandwidth or power expansion [10][11][12][13][14]. In OFDM-VLC systems, the received signal is usually distorted by the wireless channel.…”

Position encoded asymmetrically clipped optical orthogonal frequency division multiplexing in visible light communications

“…Furthermore, the low frequency noise caused by the DC wandering and flickering interference owing to florescent lights was mitigated by not modulating the first OFDM subcarrier [12] . Finally, OFDM can compensate for the performance degradation at frequencies beyond the 3 dB modulation bandwidth by exploiting its bit-and powerloading feature [13] . As such, OFDM is a robust modulation scheme that can support high R d in VLC systems.…”

A Review: Miller Encoder for Outdoor Mimo VLC Application

“…In 2001, Kulhavy of Twibright Labs developed RONJA (Reasonable Optical Near Joint Access) [8], a free technology project for reliable free-space optical data links using visible light with a range of 1.4 km and communication speed of 10 Mbps full duplex. The use of white-LED for both lighting and communication was driven by Tanaka et al in the early 2000s [9,10], reporting a 400 Mbps data transmission based on numerical analysis and computer simulations. Over the past few years research groups have been able to demonstrate that high data rates up to the gigabit per second range are possible with LED based VLC using the right choice of modulation and line coding schemes, and use of equalizers at transmitter and receiver [8][9][10][11].…”