HRO-OFDM Scheme Design and Optimization for a Hybrid RF/VLC Baseband System

Wu, Fangzhou; Chen, Li; Wang, Weidong

doi:10.1109/jphot.2017.2728102

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…We observe that the first term involving the function θ (•) is zero over the interval 0 ≤ x < cos 2 (Θ) by the definition in (12), and the cdf in ( 14) becomes equal to 1 − F θ (Θ) over this interval. The cdf is 0 for x < 0, which means the function in ( 14) is discontinuous at x = 0.…”

Section: A Deterministic User Location and Wide Fovmentioning

confidence: 91%

“…Note that, when the FOV takes a large value, the random angle θ is always less than Θ implying Pr{θ > Θ} = 0 and F θ (Θ) = 1, and (13) readily yields the cdf expression in (8) of the wide FOV scenario, as expected. We observe that the first term involving the function θ (·) is zero over the interval 0 ≤ x < cos 2 (Θ) by the definition in (12), and the cdf in (14) becomes equal to 1 − F θ (Θ) over this interval. The cdf is 0 for x < 0, which means the function in (14) is discontinuous at x = 0.…”

Section: B Deterministic User Location With Narrow Fovmentioning

confidence: 91%

“…We therefore safely assume x = c i for x ≥ c i and x = 0 for x < 0, to keep the argument of the inverse cosine function within the definition interval. Before further elaborating the cdf in ( 27), we define a new function in the following Lemma, which is actually an extension of (12).…”

Section: B Two Leds With Fixed User Locationmentioning

confidence: 99%

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Impact of Random Receiver Orientation on Visible Light Communications Channel

Eroglu

Yapıcı

Güvenç

2019

IEEE Trans. Commun.

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Visible Light Communications (VLC) has been studied thoroughly in recent years as an alternative or complementary technology to radio frequency communications. The reliability of VLC channels highly depends on the availability and alignment of line of sight links. In this work, we study the effect of random receiver orientation for mobile users over VLC downlink channels, which affects the existence of line of sight links and the receiver field of view. Based on the statistics of vertical receiver orientation and user mobility, we develop a unified analytical framework to characterize the statistical distribution of VLC downlink channels, which is then utilized to obtain the outage probability and the bit error rate. Our analysis is generalized for arbitrary distributions of receiver orientation/location for a single transmitter, and extended to multiple transmitter case for certain scenarios. Extensive Monte Carlo simulations show a perfect match between the analytical and the simulation data in terms of both the statistical channel distribution and the resulting bit error rate. Our results also characterize the channel attenuation due to random receiver orientation/location for various scenarios of interest.Index Terms-Channel statistics, Internet-of-Things (IoT), light-fidelity (Li-Fi), probability density function (pdf), random user orientation, optical wireless communications (OWC), quality of service (QoS). Receiving Axis Transmitting Axis LED Field of View User LOS Link Fig. 1: VLC downlink transmission model with random receiver orientation θ.(BER), respectively. The channel distribution is characterized in a general form so that any random statistics of the orientation and mobility can be employed directly.The analytical findings are verified through extensive simulation data matching in all cases of interest. ii. The nonlinear effect of the receiver FOV is integrated into the analytical framework parametrically, which enables the analysis of channel statistics and error performance for specific FOV chosen from a broad range of values. iii. The proposed framework rigorously handles the single LED and two LEDs cases. In addition, extension of the statistical findings to multiple LED settings are also investigated. The results verify the immediate intuitions that wider FOV and multiple LED deployment can be viable solutions in coping with the adverse effects of random receiver orientation and mobility. The rest of this paper is organized as follows. Section II introduces the system model. Section III presents distribution of the square-channel gain for a single LED case, whereas Section IV investigates channel statistics for a specific scenario with two LEDs. Section V discusses the applicability of the findings for the two LEDs setting to more general multiple LED cases. Finally, Section VI presents the respective numerical results, and Section VII concludes the paper.Notations: N (µ, σ 2 ) denotes the real valued Gaussian distribution with the mean µ and the variance σ 2 , U[a, b] denotes the continuous ...

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Section: A Deterministic User Location and Wide Fovmentioning

confidence: 91%

Section: B Deterministic User Location With Narrow Fovmentioning

confidence: 91%

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Impact of Random Receiver Orientation on Visible Light Communications Channel

Eroglu

Yapıcı

Güvenç

2019

IEEE Trans. Commun.

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“…The outage performance for hybrid RF/VLC system was studied in the work of Pan et al [11] considering the light energy harvesting over the downlink. Hybrid system consisting of radio and optical orthogonal frequency-division multiplexing (HRO-OFDM) scheme was proposed in [12] that combines the different features of RF and VLC links. Kashef et al [13] investigate the energy efficiency of hybrid RF/VLC network and study the impact of system parameters on the energy efficiency.…”

Section: Related Workmentioning

confidence: 99%

Vertical Handover-based Hybrid RF/VLC Scheme for e-Health Applications (VHO-HeA)

Samarji

Salamah

2023

Preprint

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Maximizing spectral efficiency and capacity of the conventional radio frequency (RF) systems are critical challenges occurring especially in RF-based indoor wireless communications where high data rate demands arise. Hence, the urge for finding an alternative wireless carrier is the key for exploiting the visible light communication (VLC) bands. However, the main issue incorporated with the usage of VLC band is the high dependency of connectivity on line of sight (LOS). Therefore, hybrid RF/VLC system has been top-hot topic in wireless communication where RF is capable of offering wide-area coverage and VLC has the ability to provide high transmission data rate. This paper presents vertical handover-based hybrid RF/VLC intra-software defined wireless body area network architecture to guarantee the different QoS requirements. Our proposed scheme maintains network reliability by prioritizing the processing of the emergency data. The proposed hard switching algorithm is formulated as multi-objective optimization problem aiming at minimizing the outage and blocking probabilities, worst-case latency, packet error rate, and maximizing the throughput and system fairness. To solve such multi-optimization problem, we have used Pareto simulated annealing to efficiently select either VLC link or RF link satisfying the system constraints. Simulation results show that the proposed hybrid RF/VLC scheme satisfies QoS for WBANs. In comparison with the standalone VLC system, hybrid RF/VLC scheme outperforms the latter for smaller values of signal to interference plus noise ratio. Better network performances were recorded in comparison with other state-of-the-art schemes.

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“…In the work of Pan et al, the secrecy outage performance of a hybrid RF‐VLC system is studied considering the light energy harvesting over the downlink. In the work of Wu et al, hybrid system consisting of radio and optical orthogonal frequency‐division multiplexing (HRO‐OFDM) scheme was proposed that combines the different features of RF and VLC link. Kashef et al investigate the energy efficiency benefits of integrating VLC with RF‐based network and study the impact of system parameters on the energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Hard switching‐based hybrid RF/VLC system and its performance evaluation

Gupta

Garg

Sharma

2018

Trans Emerging Tel Tech

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In this paper, we investigate the performance of hard switching‐based radio frequency/visible light communication (RF/VLC) downlink system, for indoor wireless communication system. The proposed system exploits the advantages of VLC and RF system, ie, high data rate transmission by VLC and pervasive coverage by RF. The indoor RF link is considered to be Nakagami‐m fading channel while the VLC links are subjected to statistical channel model based on the uniformly distributed end user position. In this paper, we study the performance of hybrid RF/VLC system in terms of outage probability, average bit error rate, ergodic capacity, packet error rate, and throughput. Furthermore, we compare the results of proposed RF/VLC system with stand‐alone VLC system to prove its effectiveness. The results prove that, for lower values of average signal‐to‐noise ratio, the proposed system outperforms the stand‐alone VLC system.

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HRO-OFDM Scheme Design and Optimization for a Hybrid RF/VLC Baseband System

Cited by 6 publications

References 28 publications

Impact of Random Receiver Orientation on Visible Light Communications Channel

Impact of Random Receiver Orientation on Visible Light Communications Channel

Vertical Handover-based Hybrid RF/VLC Scheme for e-Health Applications (VHO-HeA)

Hard switching‐based hybrid RF/VLC system and its performance evaluation

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