A Novel Optimal Precoder and Equalizer in $2\times 2$ MIMO VLC Systems for Vehicular Application

Farahneh, Hasan; Hussain, Fatima; Hussain, Rasheed; Fernando, Xavier

doi:10.1109/glocomw.2018.8644211

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…However, its use for ISI mitigation is not explored in the literature available on VLC. Recently, in [45], authors investigate different precoding and equalization schemes (including ZFE) for a 2 × 2 MIMO in a vehicle-to-vehicle VLC system, but this work is significantly different from ours. Firstly, and most importantly, the system under consideration in [45] is an outdoor VLC system while we consider an indoor scenario.…”

Section: ) Channel Equalizationmentioning

confidence: 93%

“…Recently, in [45], authors investigate different precoding and equalization schemes (including ZFE) for a 2 × 2 MIMO in a vehicle-to-vehicle VLC system, but this work is significantly different from ours. Firstly, and most importantly, the system under consideration in [45] is an outdoor VLC system while we consider an indoor scenario. Secondly, although the authors in [45] restrict the transmitted power to meet the dimming and illumination requirements, but there is no study on the effects of dimming on the error performance.…”

Section: ) Channel Equalizationmentioning

confidence: 93%

“…Firstly, and most importantly, the system under consideration in [45] is an outdoor VLC system while we consider an indoor scenario. Secondly, although the authors in [45] restrict the transmitted power to meet the dimming and illumination requirements, but there is no study on the effects of dimming on the error performance. Thirdly, they do not derive or study the spectral performance of dimming-based modulation schemes.…”

Section: ) Channel Equalizationmentioning

confidence: 99%

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Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

Raj

Jaiswal²,

Dixit

2021

IEEE Open J. Commun. Soc.

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Visible light communication (VLC) is being envisioned as an enabling technology to provide the much-needed spectral relief for the ever-increasing demand for Internet connectivity and data consumption. Since VLC uses illumination sources for lighting as well as communication, it is required to provide dimming control for proper lighting and enhanced error performance for reliable data communication. In this paper, we address both these issues holistically. We formulate and study the power spectral densities of dimming-based modulation schemes, namely variable on-off keying (VOOK) and variable pulse position modulation (VPPM), and hence, derive their bandwidth requirements and spectral efficiencies. Moreover, the capacity of VLC systems is severely limited by the inter-symbol interference (ISI) occurring as a result of the multipath propagation of light signals in VLC. We propose to ameliorate the error performance of VLC systems by using channel equalization for ISI mitigation, thereby enhancing the system capacity. We develop the analytical model of a dimmable VLC system employing channel equalization and use this model to study the effect of dimming and data rate on the error performance of VOOK and VPPM schemes. We present simulation and analytical results to show that the performance of dimming-based modulation schemes is significantly improved using channel equalization.INDEX TERMS Dimming, ISI mitigation, channel equalization, visible light communication.

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Section: ) Channel Equalizationmentioning

confidence: 93%

Section: ) Channel Equalizationmentioning

confidence: 93%

Section: ) Channel Equalizationmentioning

confidence: 99%

See 1 more Smart Citation

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

Raj

Jaiswal²,

Dixit

2021

IEEE Open J. Commun. Soc.

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“…2, we plot the path loss curves for different weather conditions and varying distances. We use (20) to plot the path loss curves. For clear weather conditions, we can observe from Fig.…”

Section: A Effect Of Path Loss (Scenario 1)mentioning

confidence: 99%

A Comprehensive Modeling of Vehicle-to-Vehicle Based VLC System Under Practical Considerations, an Investigation of Performance, and Diversity Property

Sharda

Reddy

Bhatnagar

et al. 2022

IEEE Trans. Commun.

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In this work, a vehicle-to-vehicle (V2V) visible light communications (VLC) model for two practical scenarios, is proposed. In scenario 1, the random lateral shift of vehicles and the deterministic longitudinal separation between two communicating vehicles are considered, whereas in scenario 2, longitudinal separation between two vehicles is considered to be random, and lateral shift of vehicles is considered to be deterministic. To this end, we emphasize comprehensive modeling of the practical characteristics of the considered V2V-VLC system, such as random path loss due to the random mobility of the vehicle, random lateral shift and random longitudinal separation of the vehicle. Moreover, we analyze the performance of the proposed V2V-VLC model in terms of different metrics under the consideration of a novel channel model. Considering our findings, it is observed that the random lateral shift of the vehicle and the random longitudinal separation between two vehicles have a significant impact on the V2V-VLC system performance. Further, at a distance of 40 m, for example, the path loss penalties for moderate and dense fog weather scenarios are 2 and 3 dB, respectively, compared with the clear weather. Furthermore, the combined impact of path loss and atmospheric turbulence affects the V2V-VLC performance significantly.

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“…The VLC channels are frequency selective channels, and this selectivity nature causes a significant degradation in VLC system performance 20,21 . Orthogonal frequency division multiplexing (OFDM) technique has been considered to mitigate the selectivity of channels and improve the VLC system performance 22 .…”

Section: Introductionmentioning

confidence: 99%

Continuous phase modulation with chaotic interleaving for visible light communication systems based on orthogonal frequency division multiplexing

Eldeeb

Al-Nahhal

Selmy

et al. 2020

Trans Emerging Tel Tech

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Visible light communication (VLC) is one of the most promising technologies which offers high data rates and flexible cost‐effective networking solutions for indoor applications. In VLC systems, the optical orthogonal frequency division multiplexing (OFDM) is considered as an efficient technique to avoid VLC channel selectivity. However, OFDM suffers from the high peak‐to‐average‐power‐ratio (PAPR) problem, which degrades the VLC system performance. In this article, we consider the use of a chaotic‐interleaver‐based continuous‐phase‐modulation (CI‐CPM) scheme together with frequency domain equalization (FDE) at the receiver end of the VLC system. A direct current bias is added to the signal to provide real‐valued non‐negative signals for intensity modulation. The proposed scheme outperforms the conventional ones in terms of PAPR. Additionally, it takes the advantages of CPM power efficiency and frequency diversity. Furthermore, three types of FDE techniques are considered and compared including the zero‐forcing (ZF) equalizer, the minimum mean square error equalizer and the regularized ZF equalizer.

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A Novel Optimal Precoder and Equalizer in $2\times 2$ MIMO VLC Systems for Vehicular Application

Cited by 7 publications

References 17 publications

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

A Comprehensive Modeling of Vehicle-to-Vehicle Based VLC System Under Practical Considerations, an Investigation of Performance, and Diversity Property

Continuous phase modulation with chaotic interleaving for visible light communication systems based on orthogonal frequency division multiplexing

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