Multi-users network model and the corresponding networking scheme for indoor VLC systems

Shang, Tao; Jiang, Tao; Yang, Yin Tang; Wang, Ping; Liu, Yu

doi:10.1364/oe.23.011600

Cited by 8 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen, the illumination level in the room is not less than 300 lx at any location on the floor of the proposed room. Illumination level calculations due to LOS components and reflection components can be found in References 30,31.…”

Section: Simulation Set‐upmentioning

confidence: 99%

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Younus

2021

Trans Emerging Tel Tech

View full text Add to dashboard Cite

The main encounters face visible light communication (VLC) systems to provide high data rates for multiuser scenario are intersymbol interference (ISI) and cochannel interference (CCI). This work proposes delay adaptation technique (DAT) in conjunction with power adaptation technique (PAT) to improve the performance of the multiuser indoor VLC systems. The DAT is used to reduce the ISI while the PAT is utilized to reduce the CCI. To apply the DAT and PAT, each access point (AP) requires to share its information with the controller, which is responsible to manage the connection between user equipment (UEs) and APs. Therefore, each AP is given a control signal (an unmodulated unique tone signal). These control signals are utilized to set‐up the connection between APs and UEs (allocate each UE its best APs, which are APs that offer good connection links). Our proposed system performance is evaluated in a realistic room while considering the effect of diffuse reflections and CCI and using on‐off‐keying modulation. The results reveal that a remarkable improvement in the VLC system's performance with using DAT and PAD compared with the VLC system without using DAT and PAT.

show abstract

Section: Simulation Set‐upmentioning

confidence: 99%

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Younus

2021

Trans Emerging Tel Tech

View full text Add to dashboard Cite

show abstract

“…Due to the use a diffuser, the output of the RYGB LDs has a Lambertian radiation pattern. Calculation of the illumination level can be found in [20][21][22]. Fig.…”

Section: Vlc System Modelmentioning

confidence: 99%

WDM for multi‐user indoor VLC systems with SCM

et al. 2019

View full text Add to dashboard Cite

A system that employs wavelength division multiplexing (WDM) in conjunction with sub-carrier multiplexing (SCM) tones is proposed to realise high data rate multiuser indoor visible light communication (VLC). The SCM tones, which are unmodulated signals, are used to identify each light unit, to find the optimum light unit for each user and to calculate the level of the co-channel interference (CCI). WDM is utilised to attain a high data rate for each user. In this study, multi-colour (four colours) laser diodes are utilised as sources of lighting and data communication. One of the WDM colours is used to convey the SCM tones at the beginning of the connection to set up the connection among receivers and light units (to find the optimum light unit for each user). To evaluate the performance of the VLC system, two types of receivers are proposed: an array of nonimaging receivers and an array of non-imaging angle diversity receivers. In this study, the effects of diffuse reflections, CCI and mobility on the system performance are considered.

show abstract

“…In this work, we considered reflections up to second order; hence, calculations of first and second order reflections of the illumination can be found in [4] and [31].…”

Section: Vlc Room Setupmentioning

confidence: 99%

CGH for Indoor Visible Light Communication System

et al. 2017

View full text Add to dashboard Cite

In this paper, we propose, design, and evaluate two indoor visible light communication (VLC) systems based on computer generated holograms (CGHs); a simple static CGH-VLC system and an adaptive CGH-VLC system. Each transmitter is followed by the CGH, and this CGH is utilized to direct part of the total power from the best transmitter and focus it to a specific area on the communication floor. This leads to reduction in inter-symbol interference and increasing in the received optical power, which leads to higher data rates with a reliable connection. In the static CG11H-VLC system, the CGH generates 100 beams (all these beams carry same data) from the best transmitter and directs these beams to an area of 2 m × 2 m on the communication floor. In the adaptive CGH-VLC system, the CGH is used to generate eight beams from the best transmitter and steer these beams to the receiver's location. In addition, each one of these eight beams carries a different data stream. Whereas in the first system, a single photodetector is used (added simplicity), an imaging receiver is used in the second one to obtain spatial multiplexing. We consider the lighting constraints where illumination should be at acceptable level and consider diffusing reflections (up to second order) to find the maximum data rate that can be offered by each system. Moreover, due to the fact that each beam in the adaptive CGH-VLC system conveys a different data stream, co-channel interference between beams is taken into account. We evaluate our proposed systems in two different indoor environments: an empty room and a realistic room using simple on-off-keying modulation. The results show that the static CGH-VLC system offers a data rate of 8 Gb/s while the adaptive CGH-VLC system can achieve a data rate of 40 Gb/s. INDEX TERMSComputer generated hologram, static CGH-VLC system, adaptive CGH-VLC system, inter-symbol interference, co-channel interference, on-off-keying.

show abstract

Multi-users network model and the corresponding networking scheme for indoor VLC systems

Cited by 8 publications

References 9 publications

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

WDM for multi‐user indoor VLC systems with SCM

CGH for Indoor Visible Light Communication System

Contact Info

Product

Resources

About