Channel Modelling for Light Communications: Validation of Ray Tracing by Measurements

Eldeeb, Hossien B.; Uysal, Murat; Mana, Sreelal Maravanchery; Hellwig, Peter; Hilt, J. Zach; Jungnickel, Volker

doi:10.1109/csndsp49049.2020.9249565

Cited by 30 publications

(17 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our channel modeling methodology is based on the nonsequential ray tracing features of OpticStudio ® . This approach was firstly deployed to model the indoor VLC channels [42]- [44] and experimentally validated in [45], [46]. More recently, it was utilized to model vehicular VLC channels [19], [38], [47].…”

Section: A Channel Modeling Methodologymentioning

confidence: 99%

Visible Light Communication for Connected Vehicles: How to Achieve the Omnidirectional Coverage?

2021

Self Cite

View full text Add to dashboard Cite

Visible light communication (VLC) is based on the idea of modulating the light intensity of LEDs to transmit information and enables the dual use of exterior automotive and road side infrastructure lighting for both illumination and communication purposes. To position VLC as a strong candidate for vehicular connectivity, it is essential to realize multi-directional reception in various deployment scenarios supporting both vehicle-to-vehicle (V2V) and infrastructure-to-vehicle (I2V) links. In this paper, we investigate the performance of a vehicular VLC system in different road types (i.e., multi-lane, curved roads), intersections (i.e., T-shaped, Y-shaped intersections) and traffic scenarios (i.e., cruising in the same or different lanes, lane change etc.). We conduct a channel modeling study based on non-sequential ray tracing to quantify the capability of receiving signals in different cases. Our results reveal that deployment of nine photodetectors with carefully determined locations on the vehicle is enough to create the required quasiomni-directional coverage for both V2V connectivity (in front and back directions) and I2V connectivity. INDEX TERMSVehicular visible light communications; Connected vehicle; Omni-directional coverage; Multi-lane road; Curved road; Intersections; Receiver model.

show abstract

Section: A Channel Modeling Methodologymentioning

confidence: 99%

Visible Light Communication for Connected Vehicles: How to Achieve the Omnidirectional Coverage?

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The other reason is that the coherence bandwidth of a tpicyal indoor non-LOS (NLOS) channel is much higher than the LED’s 3-dB bandwidth, thus making the LED capable of approximately representing the frequency response of the entire VLC system. Recent experimental results have shown that a maximum root mean-square (RMS) delay spread of 14.2 ns was measured for a 3 m NLOS link in a worst practical indoor scenario [ 39 , 40 ]. The coherence bandwidth can be estimated to be in the order of several tens of MHz, which is still much higher than the LED panel’s bandwidth of 1.4 MHz that was used in this work.…”

Section: Methodsmentioning

confidence: 99%

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

Ghassemlooy

Zvánovec

et al. 2021

Sensors

View full text Add to dashboard Cite

With advances in solid-state lighting, visible light communication (VLC) has emerged as a promising technology to enhance existing light-emitting diode (LED)-based lighting infrastructure by adding data communication capabilities to the illumination functionality. The last decade has witnessed the evolution of the VLC concept through global standardisation and product launches. Deploying VLC systems typically requires replacing existing light sources with new luminaires that are equipped with data communication functionality. To save the investment, it is clearly desirable to make the most of the existing illumination systems. This paper investigates the feasibility of adding data communication functionality to the existing lighting infrastructure. We do this by designing an experimental system in an indoor environment based on an off-the-shelf LED panel typically used in office environments, with the dimensions of 60 × 60 cm2. With minor modifications, the VLC function is implemented, and all of the modules of the LED panel are fully reused. A data rate of 40 Mb/s is supported at a distance of up to 2 m while using the multi-band carrierless amplitude and phase (CAP) modulation. Two main limiting factors for achieving higher data rates are observed. The first factor is the limited bandwidth of the LED string inside the panel. The second is the flicker due to the residual ripple of the bias current that is generated by the panel’s driver. Flicker is introduced by the low-cost driver, which provides bias currents that fluctuate in the low frequency range (less than several kilohertz). This significantly reduces the transmitter’s modulation depth. Concurrently, the driver can also introduce an effect that is similar to baseline wander at the receiver if the flicker is not completely filtered out. We also proposed a solution based on digital signal processing (DSP) to mitigate the flicker issue at the receiver side and its effectiveness has been confirmed.

show abstract

“…In an effort to validate the non-sequential ray tracing approach adopted by the IEEE, we conducted a measurement campaign in [7] and demonstrated that the results of simulations and measurements were in a good agreement. However, the considered Li-Fi scenario was limited to an empty room and single transmitter (TX) and single receiver (RX).…”

Section: Introductionmentioning

confidence: 98%

Distributed MIMO for Li-Fi: Channel Measurements, Ray Tracing and Throughput Analysis

Eldeeb¹,

Mana

Jungnickel

et al. 2021

IEEE Photon. Technol. Lett.

Self Cite

View full text Add to dashboard Cite

LiFi has been considered as a promising candidate for future wireless indoor networks. The IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models generated using the non-sequential ray tracing approach of OpticStudio. In this paper, in order to validate the channel modelling approach, at first 2 × 2 multiple-input multiple-output (MIMO) channel measurements are carried out over 200 MHz bandwidth using a channel sounder. The experimental scenario is also modeled in 3D by applying ray tracing. The obtained results indicate good agreement between simulations and measured channel impulse responses, from which parameters such as path loss and delay spread are derived. After validating the channel modeling approach, we investigate the singular values and the effect of user mobility onto the performance in a 4 × 4 distributed multi-user MIMO scenario.

show abstract

Channel Modelling for Light Communications: Validation of Ray Tracing by Measurements

Cited by 30 publications

References 22 publications

Visible Light Communication for Connected Vehicles: How to Achieve the Omnidirectional Coverage?

Visible Light Communication for Connected Vehicles: How to Achieve the Omnidirectional Coverage?

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

Distributed MIMO for Li-Fi: Channel Measurements, Ray Tracing and Throughput Analysis

Contact Info

Product

Resources

About