Comparative analysis of coverage aspects for various LEDs placement schemes in indoor vlc system

Shashikant, .; Saini, Rupali; Gupta, Akash

doi:10.1109/i2ct.2017.8226177

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…This class consists of the techniques that allow an AP or set of APs to distribute defined resources across a set of users. It is divided into two further categories: [18,73,74] Differential detection (DD) [75] Spatial light modulators (SLM) [67] Orthogonal multiplexing (WDM) [53][54][55] AP placement and configuration [43][44][45][46] Beam control and steering [32,[47][48][49][50][51][52]68] Multiple access techniques (TDMA, OFDMA, CDMA) [19][20][21] Precoding (ZF, MMSE) for MU-MISO NOMA [29][30][31][33][34][35][36][37][38][39][40][41][42] [ [22][23][24][25][26][27][28] MA-SP MA-PHY spatial diversity multiple access -Spatial diversity. This class encompasses both of the PHY and SP cases and is concerned with receiving data by many spatially unique channels or multiple PDs then performing signal processing to have them de-correlated.…”

Section: Interference Management Techniquesmentioning

confidence: 99%

“…Their results also show that ASE is reduced when lighting constraints are imposed in the optimization. Shashikant et al [45] propose different arrangements for placing the VLC APs and compare their coverage aspects. They define simple metrics, namely coverage, interference fraction and interference to coverage, to establish which arrangement is better.…”

Section: (I) Access Point Placement and Configurationmentioning

confidence: 99%

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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: Interference Management Techniquesmentioning

confidence: 99%

Section: (I) Access Point Placement and Configurationmentioning

confidence: 99%

Interference in multi-user optical wireless communications systems

Abdalla

Rahaim

Little

2020

Phil. Trans. R. Soc. A.

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“…In [16] the authors investigated on three different rectangular LED placement schemes based on geometry features (i.e., presence of voids and overlapping areas). The analysis of coverage aspects has been carried out, taking into account both coverage fraction and interference factor.…”

Section: Related Workmentioning

confidence: 99%

Optimal LED placement in indoor VLC networks

Vegni¹,

Biagi²

2019

Opt. Express

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In the upcoming 5G systems, the use of optical attocells will be largely exploited, with the aim of extending connectivity to multiple users while reducing coverage holes in indoor environments. The deployment of light emitting diodes (LEDs) should be well considered in order to use the optimal number of attocells to guarantee both illumination and connectivity, as a large and unnecessary number of attocells in a room is not useful and can cause interference among neighboring lighting cells. On the other hand, a low number of LEDs may not guarantee the whole illumination/data coverage, causing outage to users attempting to access the medium. In this paper, we investigate the problem of optimal LEDs placement in indoor environments, subject to constraints on illumination and outage based on user data rate. Two approaches are introduced, focusing on (i) the minimization of the number of LEDs to be used to provide required services and (ii) the maximization of the number of users to be served with a fixed number of LEDs, respectively. Numerical results are carried out in different room scenarios, which distinguish from the probability density function of users laying in such environments.

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“…To address this problem, the authors of [6]- [8] proposed to use multiple transmission points to provide diversity in terms of LoS links, assuming that few LED lamps can be placed on the room ceiling to provide direct illumination towards the PDs that are placed beneath. Similarly, the authors of [9] studied the benefits of applying different LED lamp deployment patterns on the ceiling to achieve a better coverage uniformity in the room. However, in all these VLC scenarios in which direct illumination is used, over-exposure problems may emerge on those room areas in which the LED light beams are focused, or the eyes of the VLC users may suffer from the glare effect that strong directive light generates if not properly distributed [10].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Communication System in Presence of Indirect Lighting and Illumination Constraints

Dowhuszko

Ilter

Hämäläinen

2020

ICC 2020 - 2020 IEEE International Conference on Communications (ICC)

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Visible Light Communication (VLC) systems are designed to provide illumination and data services simultaneously. To achieve this goal, LED lamps are usually deployed on the room ceilings, in order to maximize the chances of having Line-of-Sight (LoS) connectivity between the VLC transmitter and the random locations that the VLC receiver can take. In an early stage of adoption, where the cost of LED lighting fixtures enabled with VLC technology will not be suitable for ultra-dense deployments, it is expected that only one VLC transmitter is placed per room. In this situation, the use of direct illumination may have serious problems to satisfy the illumination constraints and provide a homogeneous data rate coverage. Moreover, the use of a single powerful LED lamp per room may create discomfort glare effect to users and over-exposure problems in areas of the room at which the light beam is directed. In order to address these problems, this paper studies the data rate that VLC technology can achieve with indirect illumination. That is, when the LED lamp is pointing upwards, and the VLC user receives the optical signal that is reflected back from the ceiling. Obtained simulation results show that indirect illumination provides a more homogeneous data rate coverage when compared to direct case, while simultaneously verifying the illumination constraints in most of the places that the VLC receiver may take in the room.

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Comparative analysis of coverage aspects for various LEDs placement schemes in indoor vlc system

Cited by 6 publications

References 5 publications

Interference in multi-user optical wireless communications systems

Interference in multi-user optical wireless communications systems

Optimal LED placement in indoor VLC networks

Visible Light Communication System in Presence of Indirect Lighting and Illumination Constraints

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