Wirelessly Transmitting a Grayscale Image using Visible Light

Abstract

This paper discusses the use of visible light as an alternative to wireless radio communication for short distances. The paper highlights how a regular grayscale image can be transmitted with this method and faithful reproduction is achieved at the receiver. LED bulbs are used as transmitters and the intensity of the LEDs is varied at very high rate, using OFDM modulation in accordance to the image data, such that the intensity appears constant to the human eye. Thus, apart from providing illumination, the LED bulb transmits data at high rates. Specific design measures prevent ambient light from interfering with the demodulation process at the receiver. Although this method can be currently used for short range, future developments can really expand its scope. General TermsData transfer technique, visible spectrum, communication.

High-Speed Visible Light Communications: Enabling Technologies and State of the Art

“…Developing alternative technologies with larger bandwidth and spectral relief is urgent. Visible light (corresponding to a wavelength band of 380 nm to 780 nm) has 10,000 times a greater spectrum than radio waves [3]. In addition, VLC does not require spectrum regulation and authorization.…”

Wireless Light Fidelity Channel Capacity Improvement Using Sparse Sampled Non-Orthogonal Frequency Shift Keying

“…The associate editor coordinating the review of this manuscript and approving it for publication was Tawfik Al-Hadhrami. the RF bandwidth, it is possible to replace or supplement the RF-based wireless data service [7], [8].…”