A multi-cell lighting testbed for VLC and VLP

Little, Thomas D. C.; Rahaim, Michael; Abdalla, Iman; Lam, E. W.; Mcallister, Richard; Vegni, Anna Maria

doi:10.23919/glc.2018.8319111

Cited by 21 publications

(11 citation statements)

References 3 publications

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“…Each of the works indicate that improvements in SINR can be achieved at a receiver by employing more PDs. However, they do not account for the variations in receiver orientation, which is critical to link performance [9,71,72].…”

Section: (Iii) Angle Diversity Receiversmentioning

confidence: 99%

Interference in multi-user optical wireless communications systems

Abdalla

Rahaim

Little

2020

Phil. Trans. R. Soc. A.

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Visible light communications (VLC) (including LiFi) represent a subset of the broader field of optical wireless communications. Where narrow beams, typical of free space optical communications are largely free from interference. VLC encompasses use cases involving combined illumination and data access and supporting a wireless access point (AP) model. The use of many units provides scaling of spatial coverage for both lighting and data access. However, AP replication in close proximity creates many interference challenges that motivate the investigation embodied in this paper. In particular, we frame the interference challenge in the context of existing strategies for driving improvements in link performance and consider the impacts of multiple users, multiple sources and multiple cells. Lastly, we review the state of existing research in this area and recommend areas for further study. This article is part of the theme issue ‘Optical wireless communication’.

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Section: (Iii) Angle Diversity Receiversmentioning

confidence: 99%

Interference in multi-user optical wireless communications systems

Abdalla

Rahaim

Little

2020

Phil. Trans. R. Soc. A.

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“…Due to the limited illumination reach of lighting fixtures, cells are naturally built based on the existing lighting infrastructure. A testbed for multi-cell VLC systems was built and described in [11]. The signal to noise ratio (SNR) within the cells was measured, and a handover scheme and its performance were reported.…”

Section: Introductionmentioning

confidence: 99%

Multiuser Visible Light Communication Systems Using OFDMA

Lian

Brandt-Pearce

2020

J. Lightwave Technol.

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Visible light communications (VLC), a short-range optical wireless communication scheme using light-emitting diodes (LEDs) as transmitters, has been proposed to support multiple users, predominantly in indoor environments. This paper explores using orthogonal frequency division multiple access (OFDMA) for VLC due to its high spectrum utilization efficiency and potentially high transmission data rate. The proposed optical OFDMA uses adjacent subcarriers as a set to support each user. Doing so allows some users to sample at a lower sampling rate and employ a smaller fast Fourier transform (FFT) to lower the computational complexity and hardware cost. A multi-cell structure is naturally obtained in VLC since more than one LED lamp is usually installed in an indoor environment. In this paper, users located in different cells can reuse the same subcarrier sets, potentially causing multiple access interference. Analysis and simulation results are used to predict the subcarrier-set reuse probability over the entire indoor space. When the OFDM modulation index is optimized considering the peak-power-limit of the LEDs, the average transmission data rate is twice that of using OFDM that does not reuse the spectral resources, for the scenarios tested.

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“…Our prior work is also relevant here. We show: (1) The impact of orientation and FOV on signal reception validated with experimental data [18], [20]. (2) A novel dynamic FOV receiver with performance prediction and experimental validation [16] and its extension to dynamic tracking (steering to point the receiver to the center of a transmitter) [17].…”

Section: Introductionmentioning

confidence: 99%