Fractional Frequency Reuse in DCO-OFDM-Based Optical Attocell Networks

Chen, Cheng; Videv, Stefan; Tsonev, Dobroslav; Haas, Harald

doi:10.1109/jlt.2015.2458325

Cited by 91 publications

(75 citation statements)

References 32 publications

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“…• the initial design of the optical APs deployment [78]- [80], • the frequency planning within the optical spectrum available [81]- [84], as well as • the cell coordination between the multiple neighbouring optical attocells [85], [86]. …”

Section: A Network-centric Optical Attocellsmentioning

confidence: 99%

“…In contrast to the static FR planning scheme, the resources are dynamically reused relying on a self-organizing allocation mechanism in [82] and a scalable orthogonal frequencydivision multiplexing access (OFDMA)-based VLC system is proposed in [83]. More recently, the Chen et al [84] designed a pair of fractional FR schemes for the DCO-OFDM-based optical attocell based networks, where strict fractional FR and soft FR were employed. However, although FR planning is an effective solution, the system has to obey the classic trade-off between having reduced bandwidth efficiency and an improved SINR.…”

Section: ) Novel Design Of Vlc Ap Arrangementsmentioning

confidence: 99%

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Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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Abstract-In order to counteract the explosive escalation of wireless tele-traffic, the communication spectrum has been gradually expanded from the conventional radio frequency (RF) band to the optical wireless (OW) domain. By integrating the classic RF band relying on diverse radio techniques and optical bands, the next-generation heterogeneous networks (HetNets) are expected to offer a potential solution for supporting the ever-increasing wireless tele-traffic. Owing to its abundant unlicensed spectral resources, visible light communications (VLC) combined with advanced illumination constitute a competent candidate for complementing the existing RF networks. Although the advantages of VLC are multi-fold, some challenges arise when incorporating VLC into the classic RF HetNet environments, which may require new system architectures. The user-centric (UC) design principle for VLC environments constitutes a novel and competitive design paradigm for the super dense multi-tier cell combinations of HetNets. The UC concept may be expected to become one of the disruptive techniques to be used in the forthcoming fifthgeneration era. This paper provides a comprehensive survey of visible-light-aided OW systems with special emphasis on the design and optimization of VLC networks, where the radically new UC design philosophy is reviewed. Finally, design guidelines are provided for VLC systems.

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Section: A Network-centric Optical Attocellsmentioning

confidence: 99%

Section: ) Novel Design Of Vlc Ap Arrangementsmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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“…In order to avoid high level of CCI, the distance between Li-Fi APs is set to be greater than the radius of an attocell. In the case that the distance is less than or equal to the radius, the technology fractional frequency reuse (FFR) [19] and spatial division multiple access (SDMA) [20] can be used to mitigate the strong interference, which is outside the scope of this study and is not discussed here.…”

Section: B Optical CCI Casementioning

confidence: 99%

Dynamic Load Balancing With Handover in Hybrid Li-Fi and Wi-Fi Networks

Wang

Haas

2015

J. Lightwave Technol.

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176

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In this paper, a hybrid network combining light fidelity (Li-Fi) with a radio frequency (RF) wireless fidelity (Wi-Fi) network is considered. An additional tier of very small Li-Fi attocells which utilise the visible light spectrum offers a significant increase in wireless data throughput in an indoor environment while at the same time providing room illumination. Importantly, there is no interference between Li-Fi and Wi-Fi. A Li-Fi attocell covers a significantly smaller area than a Wi-Fi access point (AP). This means that even with moderate user movement a large number of handover between Li-Fi attocells can occur, and this compromises the system throughput. Dynamic load balancing (LB) can mitigate this issue so that quasi-static users are served by Li-Fi attocells while moving users are served by a Wi-Fi AP. However, due to user movement, local overload situations may occur which prevent handover, leading to a lower throughput. This research studies LB in a hybrid Li-Fi/Wi-Fi network by taking into account user mobility and handover signalling overheads. Furthermore, a dynamic LB scheme is proposed, where the utility function considers system throughput and fairness. In order to better understand the handover effect on the LB, the service areas of different APs are studied, and the throughput of each AP by employing the proposed LB scheme is analysed. Index Terms-Li-Fi, Wi-Fi, Hybrid network, Load balancing, Handover overhead, VLC 0733-8724 (c)

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“…Consequently, the multipath effect due to wall reflection is minor [14]. In addition, OFDM is used in this system, which can eliminate the intersymbol interference (ISI) caused by the multi-path effect.…”

Section: B Dco-ofdm Transmissionmentioning

confidence: 99%

“…The final result of P[γ < T ] is concluded in (14). The detailed derivation will be presented in a future publication.…”

Section: Poisson Point Process Network Model and Sinr Statisticsmentioning

confidence: 99%

Downlink SINR Statistics in OFDM-Based Optical Attocell Networks with a Poisson Point Process Network Model

Cheng

Haas

2015

2015 IEEE Global Communications Conference (GLOBECOM)

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In this paper, the downlink signal-to-interferenceplus-noise ratio (SINR) statistics are analysed in a direct currentbiased optical orthogonal frequency division multiplexing (DCO-OFDM) based optical attocell network with a Poisson point process (PPP) cell deployment. An optical attocell system utilises existing lighting fixtures in an indoor environment to function as a small-cell cellular network. It uses each luminary as a base station (BS) to serve multiple nearby mobile users. Similar to a conventional radio frequency (RF) cellular system, the grid cell deployment is restricted by many practical issues in an optical attocell network. Therefore the performance of the system with PPP cell deployment is considered in this study in order to identify a lower bound for practical attocell networks with irregular cell deployment. An analytical framework is presented and compared with the computer simulations. Also the SINR statistics with different cell deployments are compared and discussed.Index Terms-cellular network, optical attocell network, Poisson point process, visible light communication.

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Fractional Frequency Reuse in DCO-OFDM-Based Optical Attocell Networks

Cited by 91 publications

References 32 publications

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Dynamic Load Balancing With Handover in Hybrid Li-Fi and Wi-Fi Networks

Downlink SINR Statistics in OFDM-Based Optical Attocell Networks with a Poisson Point Process Network Model

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