Improve uniformity for an indoor visible light communication system

Abstract

Summary Visible light communication (VLC) is an alternative technology to the radio frequency (RF) for different applications in the indoor and outdoor environments, it could be utilized for illumination and communication simultaneously, and it offers several advantages over contemporary RF technologies such as low power consumption, free license, large bandwidth, and being friendly to the environment. In this paper, an indoor VLC system uniformity improvement in terms of high received power, signal‐to‐noise ratio (SNR), and bit rate, with RMS delay spread reduction, is proposed. It features a novel model that utilizes a 13‐optical attocells configuration on the ceiling. Moreover, proposed model was evaluated at different semi‐angle at half power. The average received power and SNR were improved to 2.85 dBm and 75.5 dB, while achieved received power and SNR levels at the center of the room were 4.92 dBm and 79.5 dB, respectively. A minimum average RMS delay spread of 0.4749 nanoseconds is obtained, while the highest average bit rate calculated is 211 Mb/s. The proposed model provides a better communication quality and meets illumination standards requirements.

Quantitative analysis of different LED lamp configurations in indoor VLC system

“…The relationship between root mean delay spread and maximum data rate that can be transmitted through the VLC channel in the absence of equalizer is given in Gismalla et al 13 where R b is the bit rate and τ rms is root mean delay spread. The comparison of data rate for different spatial separations is given in Table 7.…”

“…The proposed work has focussed upon optimizing the inter‐spatial separation between the LED lamps rather than increasing the number of LED Lamps to achieve the dual purpose of communication services and lighting requirements. The viewing angle of the transmitting LEDs can be increased to increase the uniformity of illumination 13,14 . Moreover, it has been reported that smaller field of view (FOV) of receiver leads to more blind spots over the receiving plane and larger FOV makes receiver more susceptible to noise, hence it needs to be chosen wisely for practical applications 15–18 .…”

Enhanced Flip-FBMC visible light communication model

“…Table 1 shows the information used in the simulations through which the classic scenario was verified using four light units and the proposed scenario using five modules for the typical room with dimensions of 5× 5× 3m as shown in Figure 6. The intensity of radiation in the receiving level can be measured by (11) [9] and after that the luminance is calculated as the light level that the human eye accepts is 300Lx to 1500Lx as in (13) as well as calculating the DC gain in ( 14) [31]- [33].…”

“…VLC providing wide bandwidth density solves the increasing high-bandwidth demand problem face d by RF-based networks [8]. These features and advantages present in the VLC system, make it a promising technology for the 5G system as it comes with many new challenges that open new research topics [9].…”

Performance enhancement for a non-orthogonal multiple access system using 4 × 4 multiple-input multiple-output visible-light communication

“…1 This is because VLC offers various advantages, such as license-free wide bandwidth, no electromagnetic interference, and low-power consumption. [2][3][4] Moreover, VLC transmitters use high-brightness lightemitting diodes (LEDs) rather than the incandescent and fluorescent lamps of traditional light transmitters. Unique features of LEDs include higher lighting efficiency, cost-effectiveness, longer lifetimes, smaller size, and easier maintenance.…”