Path Loss and RMS Delay Spread Model for VLC-based Patient Health Monitoring System

Donmez, Baris; Miramirkhani, Farshad

doi:10.1109/wasowc54657.2022.9798434

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…The FI model is no longer suitable for fitting the OPL due to the random nature of the light under multiple TX cases. As a result of extensive simulation studies, the normal distribution is used to fit the OPL data [ 14 ]. Figure 3 b gives the cumulative distribution function (CDF) fitting line of the OPL samples for the VLC channels in Road 1.…”

Section: Analysis Of Channel Characteristicsmentioning

confidence: 99%

“…Meanwhile, at h = 2.5 m, the surrounding objects are generally lower than the users. There is less occlusion to the light rays, and more multipaths can be received by the RX, i.e., smaller OPL at h = 2.5 m. Furthermore, the mean values of the OPL fitting results for VLC channels in the IIOT scenario are larger than that for the indoor hospital (60–70 dB) in the [ 14 ]. This can be explained by the number of LEDs deployed on the ceiling.…”

Section: Analysis Of Channel Characteristicsmentioning

confidence: 99%

“…This can be explained by the number of LEDs deployed on the ceiling. Compared with the number of LEDs (15) setting in the [ 14 ], the IIoT environment in this paper is deployed with 21 LEDs, i.e., contributing much more MPCs received by the RX. Hence, the OPL is smaller in the IIoT scenario.…”

Section: Analysis Of Channel Characteristicsmentioning

confidence: 99%

“…The CIRs for each point over the user movement trajectories are obtained and the path loss and delay spread are further proposed as a function of distance through curve fitting. Furthermore, a ray tracing-based channel modeling method is adopted to characterize the effect of user mobility on the VLC channel parameters in [ 14 ]. Statistical models for path loss and RMS DS are further proposed in the simulated 3D environments, where the user, upon which three MBSN nodes are placed, walks over extensive realistic random trajectories.…”

Section: Introductionmentioning

confidence: 99%

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Channel Characteristics and Link Adaption for Visible Light Communication in an Industrial Scenario

Tang

Zhang

et al. 2023

Sensors

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Visible light communication (VLC) is one of the key technologies for the sixth generation (6G) to support the connection and throughput of the Industrial Internet of Things (IIoT). Furthermore, VLC channel modeling is the foundation for designing efficient and robust VLC systems. In this paper, the ray-tracing simulation method is adopted to investigate the VLC channel in IIoT scenarios. The main contributions of this paper are divided into three aspects. Firstly, based on the simulated data, large-scale fading and multipath-related characteristics, including the channel impulse response (CIR), optical path loss (OPL), delay spread (DS), and angular spread (AS), are analyzed and modeled through the distance-dependent and statistical distribution models. The modeling results indicate that the channel characteristics under the single transmitter (TX) are proportional to the propagation distance. It is also found that the degree of time domain and spatial domain dispersion is higher than that in the typical rooms (conference room and corridor). Secondly, the density of surrounding objects and the effects of user heights on these channel characteristics are also investigated. Through the analysis, it can be observed that the denser objects can contribute to the smaller OPL and the larger RMS DS under the single TX case. Furthermore, due to the blocking effect of surrounding objects, the larger OPL and the smaller RMS DS can be observed at the receiver with a low height. Thirdly, due to the distance dependence of the channel characteristics and large time-domain dispersion, the link adaption method is further proposed to optimize the multipath interference problem. This method combines a luminary adaptive selection and delay adaption technique. Then, the performance of the link adaption method is verified from four aspects through simulation, including the signal-to-noise (SNR), the RMS DS, the CIRs, and the bit-error rate (BER) of a direct-current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) system. The verification results indicate that our proposed method has a significant optimization for multipath interference.

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Section: Analysis Of Channel Characteristicsmentioning

confidence: 99%

Section: Analysis Of Channel Characteristicsmentioning

confidence: 99%

Section: Analysis Of Channel Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Channel Characteristics and Link Adaption for Visible Light Communication in an Industrial Scenario

Tang

Zhang

et al. 2023

Sensors

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“…To involve human mobility in the investigation, path loss with human blockage was studied based on a human moving trajectory. In [22], the human moving trajectory was generated by a random trajectory generator algorithm in which step direction angle and step length are chosen uniformly. In [18], the human moving trajectory was a fixed route next to the wall and furniture.…”

Section: Literature Reviewmentioning

confidence: 99%

Multi-Wavelength Path Loss Model for Indoor VLC with Mobile Human Blockage

Yin,

Tang,

Zhang

et al. 2023

Electronics

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Visible light communication (VLC) is one of the candidate technologies for the sixth generation (6G) networks. The path loss model is particularly important for link budget estimation and network planning in VLC. Due to the wideband nature and the extremely poor diffraction capacity of light, the path loss of the VLC channel is susceptible to wavelength dependence and blockage effect. In this paper, we propose a novel path loss model which can characterize the impact of wavelength dependence combined with mobile human blockage for both the single-LED (light emitting diode) and the multi-LED scenario. When there is no blockage in the channel, the multi-wavelength path loss under free space propagation is modeled with a small standard deviation of 0.262 in the single-LED scenario and a small root mean square error of 0.009 in the multi-LED scenario which indicates the high accuracy of the model. When considering the mobile human blockage, the blockage probability (BP) is modeled with full consideration of realistic human mobility and human body shadowing. The results indicate that the BP in single-LED scenario can reach 0.08, while the BP in multi-LED scenario is 0.022. This demonstrates that the distributed deployment of transmitters can effectively reduce the occurrence of the blockage state in VLC.

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An investigation of the effects of dynamic human obstacle movement on the performance of indoor visible light communication systems

Mohsin,

Jamel,

Hassib

2024

J Opt

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Path Loss and RMS Delay Spread Model for VLC-based Patient Health Monitoring System

Cited by 5 publications

References 13 publications

Channel Characteristics and Link Adaption for Visible Light Communication in an Industrial Scenario

Channel Characteristics and Link Adaption for Visible Light Communication in an Industrial Scenario

Multi-Wavelength Path Loss Model for Indoor VLC with Mobile Human Blockage

An investigation of the effects of dynamic human obstacle movement on the performance of indoor visible light communication systems

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