A Comprehensive Lighting Configuration for Efficient Indoor Visible Light Communication Networks

Abstract

Design of an efficient indoor visible light communication (VLC) system requires careful considerations on both illumination and communication aspects. Besides fundamental factors such as received power and signal-to-noise ratio (SNR) level, studies on mobility scenarios and link switching process must be done in order to achieve good communication link quality in such systems. In this paper, a comprehensive lighting configuration for efficient indoor VLC systems for supporting mobility and link switching with constraint on illumination, received power, and SNR is proposed. Full connectivity in mobility scenarios is required to make the system more practical. However, different from other literatures, our work highlights the significance of recognizing the main influences of field of view angle on the connectivity performance in the practical indoor scenarios. A flexible link switching initiation algorithm based on the consideration of relative received power with adaptive hysteresis margin is demonstrated. In this regard, we investigate the effect of the overlap area between two light sources with respect to the point view of the receiver on the link switching performance. The simulation results show that an indoor VLC system with sufficient illumination level and high communication link quality as well as full mobility and support link switching can be achieved using our approach.

Theoretical and experimental optimization of DMT-based visible light communication under lighting constraints

“…Assuming that LED lighting has a Lambertian radiation pattern, the horizontal luminance at a point of the receiver surface can be expressed as a function of luminous flux by [33,34]:…”

HFR Projector Camera Based Visible Light Communication System for Real-Time Video Streaming

“…The intensity of the light source is modulated according to the input data at a high rate which is faster than the persistence of human vision. However, a sensitive photodiode or an image sensor is used to detect the embedded information by decoding the on–off behavior of the light emitting diode (LED) [ 39 , 40 , 41 , 42 , 43 , 44 ]. In a VLC system, the image sensor has an advantage over the photodiode; it can separate information spatially and temporally from the light source, whereas the photodiode-based systems are highly sensitive to light and inexpensive, but require additional equipment for setting up a system.…”

Capacity enhancement of an indoor visible light communication system using cooperative transmission

“…Furthermore, it is impossible for the user to retrieve the different data when the PD receives the signals with approximately equal received power unless some techniques have been applied to mitigate or avoid CCI. Therefore, the VLC systems have to deal with CCI because it degrades the communication link quality, which can be determined by the received optical power and SINR [9].…”

“…VLC is mainly based on intensity modulation-direct detection (IM-DD) because of its low-cost implementation [7]. It reuses light-emitting diode (LED) lamps, which are installed for illumination purposes due to their low power consumption and long lifetime [8][9][10]. In a VLC system, the LEDs act as optical transmitters that transmit data by modulating their light intensity without being perceived by human eyes, and a photodiode (PD) acts as an optical receiver that is used for collecting the incident optical power over its physical area to convert it into electrical current to decode the information.…”

“…In indoor environments, several LEDs are installed for illumination purposes [10]. Because the LEDs with a wide semiangle at half power provide better illumination in some places of the room [4], the illumination areas overlap on the receiver plane; this also helps to meet the illumination requirements throughout the room [2,9], which is 300-1500 lx for offices [8,9], and to implement the multiple-input single-output (MISO) or multipleinput multiple-output (MIMO) scheme in the VLC system. When multiple LEDs are used for data transmission, the LEDs can not only cooperate to transmit data [7], but they can also coordinate their transmissions [14] to increase the capacity of the system or decrease the probability of outage [15] as well as link blockages [1,15].…”