Rateless coding for hybrid free-space optical and radio-frequency communication

AbdulHussein, Ali; Oka, A.; Nguyễn, Trung Thành; Lampe, Lutz

doi:10.1109/twc.2010.03.090108

Cited by 75 publications

(79 citation statements)

References 27 publications

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“…But more recent work (e.g. [6], [7]) considered simultaneous RF/FSO transmission similar to what is presented in this paper for hybrid RF/PLC systems.…”

Section: Introductionmentioning

confidence: 92%

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Performance of wireless/power line media diversity in the office environment

Lai

Shabehpour

Messier

et al. 2014

2014 IEEE Global Communications Conference

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The simultaneous use of wireless and power line communications (PLC) channels provides a convenient method for increasing the coverage and throughput of indoor networks. In this paper, we compare coding diversity and modulation diversity schemes that both utilize parallel wireless and PLC links. The signal to noise ratio (SNR) values used in this analysis are determined by conducting a series of average link gain measurements in an office environment. Measurement results show that both wireless and PLC SNRs have a wide range, but neither type of media is guaranteed to dominate performance for a given link. The empirical SNR values are used in a Monte Carlo simulation to evaluate the possible throughput advantages of coding and modulation wireless-PLC media diversity.

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“…But more recent work (e.g. [6], [7]) considered simultaneous RF/FSO transmission similar to what is presented in this paper for hybrid RF/PLC systems.…”

Section: Introductionmentioning

confidence: 92%

“…2 uses bitinterleaved coded modulation (BICM) [11], there are no closed-form expressions for C i w and C i p , but numerical evaluation is required, cf. [7,Eqs. (8), (9)].…”

Section: Wireless-plc Coding Diversitymentioning

confidence: 99%

Performance of wireless/power line media diversity in the office environment

Lai

Shabehpour

Messier

et al. 2014

2014 IEEE Global Communications Conference

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“…Although for a given reliability level the data rate of this approach is less due to Raptor code overhead, the average data rate is improved by nearly six times in some cases. The use of Raptor codes for hybrid OW/RF systems is also considered in [231].…”

Section: Hybrid Ow/rf Link Architecture and Networkingmentioning

confidence: 99%

A review of communication-oriented optical wireless systems

Borah

Boucouvalas

Davis

et al. 2012

J Wireless Com Network

188

104

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This article presents an overview of optical wireless (OW) communication systems that operate both in the short-(personal and indoor systems) and the long-range (outdoor and hybrid) regimes. Each of these areas is discussed in terms of (a) key requirements, (b) their application framework, (c) major impairments and applicable mitigation techniques, and (d) current and/or future trends. Personal communication systems are discussed within the context of point-to-point ultra-high speed data transfer. The most relevant application framework and related standards are presented, including the next generation Giga-IR standard that extends personal communication speeds to over 1 Gb/s. As far as indoor systems are concerned, emphasis is given on modeling the dispersive nature of indoor OW channels, on the limitations that dispersion imposes on user mobility and dispersion mitigation techniques. Visible light communication systems, which provide both illumination and communication over visible or hybrid visible/ infrared LEDs, are presented as the most important representative of future indoor OW systems. The discussion on outdoor systems focuses on the impact of atmospheric effects on the optical channel and associated mitigation techniques that extend the realizable link lengths and transfer rates. Currently, outdoor OW is commercially available at 10 Gb/s Ethernet speeds for Metro networks and Local-Area-Network interconnections and speeds are expected to increase as faster and more reliable optical components become available. This article concludes with hybrid optical wireless/radio-frequency (OW/RF) systems that employ an additional RF link to improve the overall system reliability. Emphasis is given on cooperation techniques between the reliable RF subsystem and the broadband OW system.

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“…Aerosol scattering and absorption due to rain, snow and fog result in significant optical power attenuation, beam spreading and link distance reduction, severely impairing the system performance with an increase in the link error probability; thus causing the FSO system to fall short of the desired carrier-grade availability of 99.999% under heavy, visibility-limiting weather conditions [12]. In particular, Kim and Korevaar [13] reported that the atmospheric attenuation of laser power is a random function of the weather, which can vary from 0.2 dB/km in exceptionally clear weather (i.e., 50 km visibility) to 350 dB/km in very dense fog (i.e., 50 m visibility); and evaluated the degrading impacts on the link range and availability for both enterprise-and carrier-class FSO systems through link budget analysis and historical [13,[15][16][17][18][19][20][21] have revealed that the media diversity scheme presents a more viable and effective mitigation technique under extreme weather conditions. The media diversity concept involves the utilization of a lower data-rate RF channel in conjunction with the FSO channel.…”

Section: Introductionmentioning

confidence: 99%

Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

Lee

Ghassemlooy²,

Ng³

et al. 2014

2014 9th International Symposium on Communication Systems, Networks &Amp; Digital Sign (CSNDSP)

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Due to copyright restrictions, the access to the full text of this article is only available via subscription.The availability and performance of terrestrial free-space optical (FSO) communication systems are heavily deterred by the fluctuating conditions of the atmospheric channel, particularly in the presence of visibility-limiting fog effects. In this paper, we examine the viability of deploying hybrid FSO and radio frequency (RF) links through an experimental study, which takes advantage of a dedicated laboratory atmospheric chamber to emulate the fog scenarios encountered on outdoor environment. In particular, a root mean square power detector is developed and introduced in the system under study to monitor the signal quality of the primary FSO link. The quasi-linear output voltage characteristics of the power detector device is utilized as a useful decision metric to implement hard switching in a hybrid FSO/RF link based upon the changes in the visibility. Our measurement results reveal that the selection of a desirable threshold voltage is dependent upon the intended data rate and minimum achievable bit error rate, in order to enable effective switching between the FSO and RF links.European Commissio

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Rateless coding for hybrid free-space optical and radio-frequency communication

Cited by 75 publications

References 27 publications

Performance of wireless/power line media diversity in the office environment

Performance of wireless/power line media diversity in the office environment

A review of communication-oriented optical wireless systems

Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

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