High-Speed Visible Light Communications: Enabling Technologies and State of the Art

Ji, Ruonan; Wang, Shaowei; Liu, Qing-Quan; Lü, Wei

doi:10.3390/app8040589

Cited by 60 publications

(38 citation statements)

References 85 publications

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“…Ever since the first demonstration of ambient-sunlight wireless telephone communication [1], the field of optical wireless communication has evolved significantly. The recent advent of light-emitting diode (LED) and laser diode (LD) allows one to integrate efficient solid-state lighting (SSL) and high-speed visible light communication (VLC), offering data security and immunity to electromagnetic interference [2]. Beyond this, VLC provides the resource for mitigating the saturating bandwidth in the conventional radio-frequency (RF) band.…”

Section: Introductionmentioning

confidence: 99%

High-power blue superluminescent diode for high CRI lighting and high-speed visible light communication

Alatawi¹,

Holguín‐Lerma²,

Kang³

et al. 2018

Opt. Express

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We demonstrated a high-power (474 mW) blue superluminescent diode (SLD) on c-plane GaN-substrate for speckle-free solid-state lighting (SSL), and high-speed visible light communication (VLC) link. The device, emitting at 442 nm, showed a large spectral bandwidth of 6.5 nm at an optical power of 105 mW. By integrating a YAG-phosphor-plate to the SLD, a CRI of 85.1 and CCT of 3392 K were measured, thus suitable for solid-state lighting. The SLD shows a relatively large 3-dB modulation bandwidth of >400 MHz, while a record high data rate of 1.45 Gigabit-per-second (Gbps) link has been achieved below forward-error correction (FEC) limit under non-return-to-zero on-off keying (NRZ-OOK) modulation scheme. Our results suggest that SLD is a promising alternative for simultaneous speckle-free white lighting and Gbps data communication dual functionalities.

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Section: Introductionmentioning

confidence: 99%

High-power blue superluminescent diode for high CRI lighting and high-speed visible light communication

Alatawi¹,

Holguín‐Lerma²,

Kang³

et al. 2018

Opt. Express

View full text Add to dashboard Cite

show abstract

“…For example, the design of a multi-user VLC would require highly directional LEDs to reduce the multi-user interference; however, such choice may not satisfy the illumination requirements and joint design might be needed. • Although the available bandwidth in the visible light band is abundant, the current off-the-shelf LEDs have a limited bandwidth, a few to tens of Megahertz, and the realization of high data-rate VLC has triggered both new optical enabling technologies [99]- [102] and/or the adoption of "RF-inspired" advanced communication and signal processing schemes such as MIMO, MU-MIMO, spectrally efficient multiple access schemes, adaptive modulation and equalization, cooperative communication schemes such as relaying and CoMP, and others [97], [103], [104]. • The high correlations are common in VLC systems as the received signals in a LOS scenario are almost identical [73].…”

Section: A Key Design Considerationsmentioning

confidence: 99%

Multi-User Visible Light Communications: State-of-the-Art and Future Directions

et al. 2018

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Visible light communication (VLC) builds upon the dual use of existing lighting infrastructure for wireless data transmission. VLC has recently gained interest as cost-effective, secure, and energy-efficient wireless access technology particularly for indoor user-dense environments. While initial studies in this area are mainly limited to single-user point-to-point links, more recent efforts have focused on multi-user VLC systems in an effort to transform VLC into a scalable and fully networked wireless technology. In this paper, we provide a comprehensive overview of multi-user VLC systems discussing the recent advances on multi-user precoding, multiple access, resource allocation, and mobility management. We further provide possible directions of future research in this emerging topic.Index Terms-Visible light communication, multi-user communications, MIMO, precoding, non-orthogonal multiple access schemes, sum rate capacity, handover.

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“…Like RF channel, an indoor VLC channel also consists of two links, which are called the directed path or LoS, and the second link is diffused or NLoS [4]. Generally, only LoS link is evaluated as it holds almost 95% of total optical power at the receiver.…”

Section: Vlc Channel Model For Multi-users Communicationmentioning

confidence: 99%

“…light band for relieving the RF spectrum from congestion. For commercialization, IEEE standardizes VLC as Wireless Personal Area Networks (WPAN) in IEEE 802.15.17 [3,4].…”

mentioning

confidence: 99%

Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems

et al. 2019

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Visible Light Communication (VLC) is a data communication technology that modulates the intensity of the light to transmit the information mostly by means of Light Emitting Diodes (LEDs). The data rate is mainly throttled by the limited bandwidth of the LEDs. To combat, Multi-carrier Code Division Multiple Access (MC-CDMA) is a favorable technique for achieving higher data rates along with reduced Inter-Symbol Interference (ISI) and easy access to multi-users at the cost of slightly reduced compromised spectral efficiency and Multiple Access Interference (MAI). In this article, a multi-user VLC system is designed using a Discrete Wavelet Transform (DWT) that eradicates the use of cyclic prefix due to the good orthogonality and time-frequency localization properties of wavelets. Moreover, the design also comprises suitable signature codes, which are generated by employing double orthogonality depending upon Walsh codes and Wavelet Packets. The proposed multi-user system is simulated in MATLAB software and its overall performance is assessed using line-of-sight (LoS) and non-line-of-sight (NLoS) configurations. Furthermore, two sub-optimum multi-users detection schemes such as zero forcing (ZF) and minimum-mean-square-error (MMSE) are also used at the receiver. The simulated results illustrate that the doubly orthogonal signature waveform-based DWT-MC-CDMA with MMSE detection scheme outperforms the Walsh code-based multi-user system. Keywords: visible light communication (VLC); LED; photo-diode (PD); line-of-sight (LoS); non-line-of-sight (NLoS); multi-carrier code division multiple access (MC-CDMA); discrete wavelet transform (DWT); doubly orthogonal wavelet packets (DOWP); multiple access interference (MAI); minimum-mean-square-error (MMSE) IntroductionWith unprecedented demand for high-speed multi-media mobile services, optimization of wireless communication systems has become critical. Due to the limited range of frequencies, radio-frequency (RF) technology is unable to fulfill the needs for the current demands of mobile users [1]. As we are advancing towards 5G, the necessity for the evolution in broadband communication technologies has grown to its peak. The 5G communication networks have already defined performance requirements in which high-speed data delivery (expected to be 10 Gbps) and low latency (less than 1 ms) are the key performance parameters [2]. Visible Light Communication (VLC) is a completely new paradigm that is going to revolutionize the next generation of wireless communication by making use of a visible

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High-Speed Visible Light Communications: Enabling Technologies and State of the Art

Cited by 60 publications

References 85 publications

High-power blue superluminescent diode for high CRI lighting and high-speed visible light communication

High-power blue superluminescent diode for high CRI lighting and high-speed visible light communication

Multi-User Visible Light Communications: State-of-the-Art and Future Directions

Doubly Orthogonal Wavelet Packets for Multi-Users Indoor Visible Light Communication Systems

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