A PHY/MAC Cross-Layer Analysis for IEEE 802.15.7 Uplink Visible Local Area Network

Dang, Ngoc T.; Vuong, V.

doi:10.1109/jphot.2019.2913456

Cited by 7 publications

(8 citation statements)

References 19 publications

(23 reference statements)

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“…Another cogent reason for adopting this simple channel model here is that adopting other channel models can add significant randomness to the performance metrics, which can hinder understanding the intrinsic behaviour of CSMA-CA. It is also worth noting that most of the related works [16,[18][19][20][21][22] employ the same channel model justified by the results of several studies investigating the channel model of indoor VLC [28][29][30], which conclude the tiny effects of NLOS.…”

Section: Imperfect Channel Sensing (Ics)mentioning

confidence: 94%

“…Evaluating the effects of the ICS on the performance of IEEE 802.15.7 CSMA-CA is a challenge as ICS results from the interaction amongst several stochastic processes; specifically, the stochastic processes that generate packets, manage durations between two consecutive CSMA-CA channel assessments and outline the directivity of light beams. Several works have been devoted to overcoming this challenge by employing one or more simplification assumptions, such as a transmitter that can see all ongoing transmissions from other nodes [18][19][20][21][22], or when the traffic generated by a node is set in accordance with the channel status, as proposed in [16,17].…”

Section: Introductionmentioning

confidence: 99%

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MSAM: Modular Statistical Analytical Model for MAC and Queuing Latency of VLC Networks under ICS Conditions

Baz

2021

Electronics

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Visible Light Communication (VLC) offers distinctive advantages over conventional radio frequency; wide unlicensed spectrum, resistance to electrometric interference and low susceptibility to security risks, are few to name. Excitingly, VLC becomes a cornerstone in several communication systems such as light fidelity, optical camera communication and the Internet of Radio Light. Most of these networks adopt the Carrier Sensing Multiple Access-Collision Avoidance (CSMA-CA) of IEEE 802.15.7, the official standard for the VLC, as a Medium Access Control (MAC) protocol. Motivated by the crucial roles of MAC in shaping the performance of the VLC and the wide variety of operational conditions demanded by the enormous applications, this paper proposes a Modular Statistical Analytical Model (MSAM). The fundamental approach of MSAM is to segregate the interacting stochastic processes imposed by the CSMA-CA protocol into a set of its elementary subprocesses. The MSAM then synthesises these processes in such a way that quantifies their mutual dependency without making a strict assumption on their characteristics; thus, different operational conditions can be assessed without a need to reconstruct the model. Besides, MSAM employs the radiometry and photometry of VLC to derive mathematical expressions describing the hidden and exposed nodes from which the Imperfect Carrier Sensing (ICS) conditions are defined. The MSAM exploits statistical and queuing theorems to model a VLC as a network of G/G/1 queues from which several probability distributions, characterising the operations of VLC from different perspectives, are derived. Inter-departure, queuing, service time and successful service time are the main distributions in conjunction with throughput, total delay, probability of exposed and hidden node collisions, which are the main outputs of MSAM. Validation for the integrity of the MSAM under different scenarios is carried out by conducting a head-to-head comparison between its results and simulation outcomes.

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Section: Imperfect Channel Sensing (Ics)mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

MSAM: Modular Statistical Analytical Model for MAC and Queuing Latency of VLC Networks under ICS Conditions

Baz

2021

Electronics

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“…Unlike the previous works, Dang and Mai included some physical parameters into an extended version of Dobar’s Markov chain model, resulting in a 3D graph structure [ 11 ]. Although the authors stated that a single reflection was considered to simulate its impact on the network performance, there is a lack of results in this regard.…”

Section: Related Workmentioning

confidence: 99%

“…It is straightforward to demonstrate that the conclusions extracted from these works are strongly biased and cannot be considered as accurate models of real-world deployments. Moreover, there are few contributions in the literature addressing the problem in a holistic manner [ 11 ]. Due to the relative novelty of VLC there are not many software libraries for traditional network simulation platforms (OMNET++, NS-2, OPNET, Prowler, etc.).…”

Section: Introductionmentioning

confidence: 99%

MAC/PHY Comprehensive Visible Light Communication Networks Simulation

Torres-Zapata

Guerra

Rabadán

et al. 2020

Sensors

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In this paper, the effect of channel conditions on the global behavior of a wireless Visible Light Communications (VLC) optical network are studied. It presents a system-level simulator that considers jointly a channel propagation model and the MAC mechanisms to have a realistic description of the network, even in situations where the emitted signal is heavily affected by reflections in any close surface or obstacle. The resulting platform also accurately evaluates both Line-Of-Sight (LOS) and Non-LOS (NLOS) contributions on each node and enables the effective use of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) schemes as defined by IEEE 802.15.7r1 standard, as well as allows a correct evaluation of lifelike problems such as the effect of hidden nodes. This work shows the necessity of accurately modeling VLC MAC layer performances, taking also into account the physical nature of visible light propagation in indoor scenarios.

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“…Therefore, the identification efficiency is not optimal. In recent years, a physical layer separation technology can identify tags in collision time slots and can greatly improve the identification efficiency [4]. The technology requires the separation of collided signals before the decoding.…”

Section: Introductionmentioning

confidence: 99%

A Physical‐Layer UHF RFID Tag Collision Resolution Based on Miller Code

Zeng

Ding

2021

Wireless Communications and Mobile Computing

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In an ultrahigh frequency (UHF) radio frequency identification (RFID) system, the throughput can be greatly improved by collision resolution on a physical layer when tags collide, and high-performance coding technology can improve the bit error rate (BER) performance of the physical-layer separation. Most of the traditional physical collision resolutions focus on the code with a single subcarrier. This paper pays more attention to Miller code with multiple subcarriers and proposes a novel physical-layer separation method based on the Miller code. In this method, the separated collision signals are multiplied by clock signals with the same frequency as the subcarrier to complete the frequency shift. And then, a coherent demodulation and a low-pass filter are used to remove high-frequency separation noise. In the simulation, the Miller code with more subcarriers has lower BER than FM0 code with a single carrier. Especially when Miller 8 is selected, the separation efficiency and BER performance of the proposed method are 4 dB higher than those of the traditional XOR method at lower SNR.

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A PHY/MAC Cross-Layer Analysis for IEEE 802.15.7 Uplink Visible Local Area Network

Cited by 7 publications

References 19 publications

MSAM: Modular Statistical Analytical Model for MAC and Queuing Latency of VLC Networks under ICS Conditions

MSAM: Modular Statistical Analytical Model for MAC and Queuing Latency of VLC Networks under ICS Conditions

MAC/PHY Comprehensive Visible Light Communication Networks Simulation

A Physical‐Layer UHF RFID Tag Collision Resolution Based on Miller Code

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