A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment

Li, Xicong; Ghassemlooy, Zabih; Zvánovec, Stanislav; Haigh, Paul Anthony

doi:10.3390/s21051697

Cited by 17 publications

(9 citation statements)

References 43 publications

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“…[8] probabilistic constellation shaping is applied to a practical wavelength division multiplexing (WDM)‐based VLC to reach a near‐Shannon capacity transmission rate of 10.8 [Gbps]. Moreover, [9] has used existing LED panels to implement a 40 [Mbps] VLC system to integrate VLC with existing equipment. Recently, an all‐optical wireless bidirectional multiple access scheme for the VLC access points is proposed in ref.…”

Section: Introductionmentioning

confidence: 99%

Fairness analysis of indoor multi‐user communications through steerable IR‐beam

Masoumi

Johar

Salehiyan

et al. 2023

IET Optoelectronics

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Downlink data transmission of multi-user indoor optical wireless communications and its corresponding fairness analysis is studied by the authors. It is assumed that access points (APs) may use infrared beam (IR-beam) laser or light emitting diodes (LEDs) for data transmissions. For the case of APs with IR-beams, since the bandwidth of the transmitted optical signal can be very large than that of the LED's, a typical time-division multiple access (TDMA) scheme is utilised to serve multiple users and the respective achievable rates are derived. Then, for a general fairness-scheduling utility function with the capability of adjusting the degree of fairness known as α-proportional fairness, optimal timesharing coefficients are analytically derived in closed-forms. To compare the performance of the IR-based communications for the LED-based APs, two non-cooperative and cooperative data transmission schemes are also studied and the corresponding achievable rates are presented based on the classical superposition coding. Finally, to compare the performance of the two types of APs, per user data rate of the proposed systems are compared through numerical results for different scenarios to highlight advantages and drawbacks of the two types of APs. Also, by considering the Jain's index as a fairness metric, the impact of the system parameters on the fairness is discussed through numerical results. K E Y W O R D S 5G mobile communication, laser beam applications, optical communication | INTRODUCTIONThanks to the large bandwidth of optical signals, it is possible to provide users with high-data rate access via wireless optical signaling instead of the radio frequency (RF) . Also, in contrast to RF waves that can be easily eavesdropped, due to the directive and limited free space propagation range of the optical signals, optical wireless communication (OWC) has gained research and practical interests to provide safer, that is, non-electromagnetic radiations, high-rate, reliable and secure communications.To provide high-rate indoor access to the users, one of the promising solutions is to utilise the low-cost and illuminating LEDs as access points (APs) for downlink data transmissions [1,2]. This technique is known as visible light communications (VLC) and it is thoroughly studied in the literature from different perspectives [3][4][5][6][7][8][9][10][11][12][13][14]. The weak signal power received from reflected paths and susceptibility of the OWC to blockages, however, makes it hard to provide almost even quality of service in different locations in a room using OWC. Therefore, it is essential to optimise the design parameters such that all users are evenly served no matter where in the room they are located. Hence, in this paper, we aim to analyse ways to fairly serve users in different locations of a room. Now we provide a literature review of the existing works for VLC. In ref [3], the maximisation of the achievable downlink sum-rate of a VLC-based distributed multiple-input multipleoutput (D-MIMO) communications under p...

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Section: Introductionmentioning

confidence: 99%

Fairness analysis of indoor multi‐user communications through steerable IR‐beam

Masoumi

Johar

Salehiyan

et al. 2023

IET Optoelectronics

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“…VLCs have an unguided propagation media, which implies flexibility and adaptability in their applications. Another relevant factor of VLC links is that they can be implemented using preexisting infrastructure, e.g., illumination lamps [2].…”

Section: Introductionmentioning

confidence: 99%

Phase Characterization and Correction in a Hardware Implementation of an OFDM-Based System for VLC Applications

2023

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Orthogonal frequency-division multiplexing (OFDM) systems have been widely implemented in guided and non-guided communications. Even though they are becoming a standard for popular technologies such as WiFi, their implementation in newly emerging ones is still in evolution. As the number of connected devices increases, the radio frequency (RF) channel gets crowded. Here is where the visible light communication (VLC) links gain interest. VLC offers a wireless alternative to RF with a trade-off between the necessity of line of sight with the offer of a free, highly secure, and immune to electromagnetic interference communication channel. Therefore, the characterization and implementation of new techniques that can solve this kind of channel's particularities will help the technology achieve the maximum of its capacities. This paper proposes a programmable software implementation of an OFDM system using a novel phase correction technique for VLC channels. The new equation takes into account two types of phase shifts, one that will be non-deterministic (has a random variation) and another that will be deterministic and, therefore, can be estimated and corrected. This second can be split into two: one that comes from the clock differences and has more impact on higher subcarriers, and the second that appears from the electronics of the link and will directly impact the symbols' phase. The main difference with current phase correction techniques is the identification and estimation of the deterministic noise specific to VLC systems. The deterministic noise impact all subcarriers equally and must be subtracted before the measure of the shift induced by the differences between the transmitter and receiver clocks. Another difference is that the analysis and tests have been done with data collected in an actual hardware implementation.

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“…Proposing a transceiver design to set up practical communication links is that important. In [13] and [14], a receiver for M -CAP modulation with a conventional synchronization method is designed. Also, they have provided a digital signal processing solution for removing the flicker caused by the current bias of LEDs.…”

Section: Introductionmentioning

confidence: 99%

HCM-based Indoor Optical Wireless Communications: Timing and Data Recovery

Johar¹,

Salehiyan²,

emadi³

et al. 2023

Preprint

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<p>Light-fidelity (Li-Fi) is a promising solution to provide high-rate, secure, and green communications to be used in the next generation of wireless networks. Since visible or infrared (IR) light-emitting diodes (LEDs) are used as the optical source and have a nonlinear transfer function, the transmitted modulated signal can be distorted if the signal has a high peak-to-average power ratio (PAPR). Recently, a new modulation scheme called Hadamard-coded modulation (HCM) is proposed which has a low PAPR and produces symbols with discrete levels. In the HCM technique, the symbol levels can be created using multiple LEDs. Therefore, each LED operates in its linear region and just switches on or off. In this paper, a low-complexity transceiver architecture for the HCM-based communication links is proposed and a complete synchronization procedure based on the spread spectrum techniques is presented. Finally, the bit error rate of the system is evaluated by Monte Carlo simulations, and effects of system parameters such as preamble length, fall and rise time of optical devices, and timing jitter on the bit error rate of the link are discussed.<br> </p>

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A 40 Mb/s VLC System Reusing an Existing Large LED Panel in an Indoor Office Environment

Cited by 17 publications

References 43 publications

Fairness analysis of indoor multi‐user communications through steerable IR‐beam

Fairness analysis of indoor multi‐user communications through steerable IR‐beam

Phase Characterization and Correction in a Hardware Implementation of an OFDM-Based System for VLC Applications

HCM-based Indoor Optical Wireless Communications: Timing and Data Recovery

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