Impact of Interference on Visible Light Communication Performance in a Vehicular Platoon

AbstractIn recent time of looming radio frequency (RF) spectrum crisis, visible light communication using lighting infrastructure emerged as a potential alternative at an indoor environment. This paper addresses the setback associated with ambient light interference in an indoor Visible Light Communication (VLC) system to ensure joint communication and illumination performance inside an office room. A novel VLC architecture with suitable white light emitting diode (WLED) luminaire arrangement is presented to minimize the dispersion of signal to interference plus noise ratio (SINR) across the room. Luminaires are categorized in two groups viz. data transmitting illuminants and illuminants for lighting purpose. The first group is dedicated to transmit data as well as serves the purpose of illumination. The other set creates only ambient illumination to achieve quality lighting attributes. The proposed forward error corrected receiver configuration discards the ambient light noise originated by the illuminants that serve the ambient illumination. Tail biting convolutional encoder and viterbi decoder are used at the encoding section of the transmitter and decoding section of the receiver respectively to improve bit error rate. Results obtained through MATLAB simulation shows better average bit error rate (BER) in the order of 10−8 measured at uniformly distributed 25 grid points over the working plane. At the same time achieved average horizontal illuminance with good uniformity comply with ISO recommendation.

Download Full-text

Modeling and Analysis of DIPPM: A New Modulation Scheme for Visible Light Communications

Journal of Sensors ◽

10.1155/2015/963296 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 5

Author(s):

Sana Ullah Jan ◽

Young-Doo Lee ◽

Insoo Koo

Keyword(s):

Visible Light ◽

Direct Detection ◽

Visible Light Communication ◽

Modulation Scheme ◽

Light Sources ◽

Visible Light Communications ◽

Error Performance ◽

Communication Performance ◽

Modeling And Analysis ◽

Dimming Control

Visible Light Communication (VLC) uses an Intensity-Modulation and Direct-Detection (IM/DD) scheme to transmit data. However, the light source used in VLC systems is continuously switched on and off quickly, resulting in flickering. In addition, recent illumination systems include dimming support to allow users to dim the light sources to the desired level. Therefore, the modulation scheme for data transmission in VLC system must include flicker mitigation and dimming control capabilities. In this paper, the authors propose a Double Inverse Pulse Position Modulation (DIPPM) scheme that minimizes flickering and supports a high level of dimming for the illumination sources in VLC systems. To form DIPPM, some changes are made in the symbol structure of the IPPM scheme, and a detailed explanation and mathematical model of DIPPM are given in this paper. Furthermore, both analytical and simulation results for the error performance of 2-DIPPM are compared with the performance of VPPM. Also, the communication performance of DIPPM is analyzed in terms of the normalized required power.

Download Full-text

Visible light communication performance in weak illumination environment

2015 Opto-Electronics and Communications Conference (OECC) ◽

10.1109/oecc.2015.7340211 ◽

2015 ◽

Author(s):

Shangbin Li ◽

Chen Gong ◽

Zhengyuan Xu

Keyword(s):

Visible Light ◽

Visible Light Communication ◽

Communication Performance

Download Full-text

A Block Bi-Diagonalization-Based Pre-Coding for Indoor Multiple-Input-Multiple-Output-Visible Light Communication System

Energies ◽

10.3390/en13133466 ◽

2020 ◽

Vol 13 (13) ◽

pp. 3466 ◽

Cited By ~ 7

Author(s):

Prabu Subramani ◽

Ganesh Babu Rajendran ◽

Jewel Sengupta ◽

Rocío Pérez de Prado ◽

Parameshachari Bidare Divakarachari

Keyword(s):

Visible Light ◽

Data Transmission ◽

Electromagnetic Interference ◽

Multiple Input Multiple Output ◽

Visible Light Communication ◽

Fluorescent Light ◽

Communication Performance ◽

Optical Wireless Communications ◽

Multiple Input ◽

Input Multiple Output

Visible Light Communication (VLC) is a promising field in optical wireless communications, which uses the illumination infrastructure for data transmission. The important features of VLC are electromagnetic interference-free, license-free, etc. Additionally, Multiple-Input-Multiple-Output (MIMO) techniques are enabled in the VLC for enhancing the limited modulation bandwidth by its spectral efficiency. The data transmission through the MIMO-VLC system is corrupted by different interferences, namely thermal noise, shot noise and phase noise, which are caused by the traditional fluorescent light. In this paper, an effective precoding technique, namely Block Bi-Diagonalization (BBD), is enabled to mitigate the interference occurring in the indoor MIMO-VLC communications. Besides, a Quadrature Amplitude Modulation (QAM) is used to modulate the signal before transmission. Here, the indoor MIMO-VLC system is developed to analyze the communication performance under noise constraints. The performance of the proposed system is analyzed in terms of Bit Error Rate (BER) and throughput. Furthermore, the performances are compared with three different existing methods such as OAP, FBM and NRZ-OOK-LOS. The BER value of the proposed system of scenario 1 is 0.0501 at 10 dB, which is less than that of the FBM technique.

Download Full-text

Research of LED Emission Cross-Section on Light Communication Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.3039 ◽

2014 ◽

Vol 602-605 ◽

pp. 3039-3042

Author(s):

Wei Min Qi ◽

Jie Xiao

Keyword(s):

Visible Light ◽

Cross Section ◽

Power Distribution ◽

Communication Systems ◽

Emission Cross Section ◽

Optical Power ◽

Visible Light Communication ◽

Communication Performance ◽

Light Emitting ◽

Communication Source

Visible light communication (VLC) is an optical wireless communication technology that uses visible light emitting diodes (LEDs) as a communication source. Since the LEDs are also used for illumination, the cross-section emission effects of the LEDs need to be analyzed as they apply to indoor VLC channels. In order to evaluate the illumination and communication performance according to the emission cross-section pattern, a simple LED model with a quasi-elliptic emission cross-section is proposed and compared to a circular LED model. The LEDs with a quasi-elliptic emission cross-section provide less fluctuation in the illumination and optical power distribution at the receiving plane. The four-transmitter VLC system is found to support at least at 30 and 33 Mb/s for circular and quasi-elliptic emission cross-section LEDs for the entire receiving plane, respectively.

Download Full-text