Short‐Range Wireless Communications

Fettweis, Gerhard; Zimmermann, Ernesto; Allen, Ben; O’Brien, Dominic; Chevillat, P.; Jungnickel, Volker; Jorswiek, Eduard; Zillmann, Peter; Petrovic, D.; Schwieger, Katja; Windisch, Marcus; Seller, Olivier; Siohan, Pierre; Lallemand, Frédéric; Salingue, Guy; Pierrot, Jean Benoît; Debbah, Mérouane; Gesbert, David; Knopp, Raymond; Perre, Liesbet Van der; Brown, Tony; Zhang, David; Malik, W.Q.; Edwards, D.J.; Stevens, Christopher J.; Ouvry, Laurent; Morche, Dominique; Oppermann, Ian; Celentano, Ulrico; Katz, Marcos; Kalliojarvi, K.; Arnon, Shlomi; Matsumoto, Mitsuji; Green, Roger; Jivkova, S.; Coronel, Pedro; Schott, W.; Zasowski, T.; Ghavami, Mohammad; He, Rujie; Sörgel, Werner; Kuhnert, C.; Wiesbeck, W.; Hernandez, Marco; Siwiak, Kazimierz; Manny, Ben; Mucchi, Lorenzo; Morosi, Simone; Ran, Moshe

doi:10.1002/9780470994467.ch7

Cited by 9 publications

(7 citation statements)

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“…Increasing user demand for fast wireless data communications is placing pressure on the existing broadband RF/microwave wireless technologies, which have limited bandwidth (BW) and a congested spectrum. The application of advanced materials for solid-state lighting may offer a solution to this problem through the emergent field of visible light communications (VLC), which uses LEDs for both illumination and wireless data transfer. − The main motivations for this technology include the increasing use and performance of solid-state lighting, its potential for a dual use as a high data rate transmitter, and the ability to access hundreds of THz of additional unregulated bandwidth for wireless communications . While the spectral range of choice for optical fiber communications is in the near-infrared at 1.5 μm (to match the transmission window of silica fibers) for free space data communications, the use of visible light has inherent advantages for simple user alignment of the data link and secure knowledge of where the data has been transmitted.…”

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confidence: 99%

“…The most common efficient approach for LED illumination is to use phosphor converted white LEDs (pcLEDs). , In this approach a blue InGaN LED is coated with a yellow phosphor so that a fraction of the blue light is absorbed and re-emitted at longer wavelengths to give a two-color white. While acceptable for illumination, the phosphor materials in pcLEDs are a well-known bottleneck for VLC. , This is due to their long photoluminescence (PL) lifetime which limits the intrinsic system bandwidth to a few MHz. Even the introduction of a blue filter at the receiver which suppresses the yellow emission, or the use of pre-equalization techniques, only leads to modest improvements in the modulation bandwidth (∼30 MHz).…”

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confidence: 99%

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Novel Fast Color-Converter for Visible Light Communication Using a Blend of Conjugated Polymers

et al. 2015

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Visible Light Communications (VLC) is a promising new technology which could offer higher data transmission rates than existing broadband RF/microwave wireless technologies. In this paper, we show that a blend of semiconducting polymers can be used to make a broadband, balanced color converter with a very high modulation bandwidth to replace commercial phosphors in hybrid LEDs for visible light communications. The resulting color converter exploits partial Forster energy transfer in a blend of the highly fluorescent green emitter BBEHP-PPV and orange-red emitting MEH-PPV. We quantify the efficiency of the photoinduced energy transfer from BBEHP-PPV to MEH-PPV, and demonstrate modulation bandwidths (electrical-electrical) of ∼200 MHz, which are 40 times higher than commercially available phosphor LEDs. Furthermore, the VLC data rate achieved with this blend using On−Off Keying (OOK) is many times (∼35) higher than that measured with a commercially available phosphor color converter.

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confidence: 99%

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Novel Fast Color-Converter for Visible Light Communication Using a Blend of Conjugated Polymers

et al. 2015

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“…It has numerous advantages over the sinusoidal carrier-based communication technology, and enables effective and reasonable transmission in the wireless sensor network [1,2]. The UWB is an emerging technology designed at short range and high transmission rate [3,4]. Besides, the UWB can offer a fine resolution when it comes to evaluate distance or location [5].…”

Section: The Uwb Protocolmentioning

confidence: 99%

Design and Development of Vehicle Collision-Avoidance System Based on UWB Wireless Sensor Networks

Xu¹,

Feng²,

Lv³

et al. 2017

Proceedings of the 7th International Conference on Computer Engineering and Networks — PoS(CENet2017)

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In order to solve the personal injury accidents when the vehicle drives in the mine, this paper designs and developments an vehicle collision-avoidance system based on UWB Wireless Sensor Networks which can solve the personal injury accidents. The UWB is an emerging technology designed at short range and high transmission rate which can offer a fine resolution to evaluate distance. This paper presents the vehicle collision-avoidance system composition which consists of both the hardware composition and software design. It also presents the principle of ranging algorithm which is used to implement the function of vehicle collision-avoidance. The vehicle collision-avoidance system has been tested in the mine and the personal injury accidents have greatly decreased. Therefore, the system will have a fine application prospects in mine. CENet2017

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“…Increasing demand for wireless communications has driven research into improving data transmission concepts [11][12][13][14][15][16][17][18][19][20][21] . The oligofluorene arms have a substituent effect on the BODIPY core and therefore the increase in the number of arms influences the photophysics of the material.…”

Section: Institute Of Physical-organic Chemistry and Coal Chemistry mentioning

confidence: 99%

BODIPY star-shaped molecules as solid state colour converters for visible light communications

Vithanage

Manousiadis

Sajjad

et al. 2016

Applied Physics Letters

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Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version CURVE is the Institutional Repository for Coventry University may remain and you are advised to consult the published version if you wish to cite from it. They are broadband visible emitters whose emission can be tuned by changing the chemical structure, and can have high photoluminescent quantum yields (PLQY) of up to 90% in undiluted films 5,9,10 . This combined with simple and low cost solution processing techniques make them attractive materials for optoelectronic devices.An emerging application area for organic semiconductors is in the field of visible light communications (VLC).Increasing demand for wireless communications has driven research into improving data transmission concepts 3The oligofluorene arms have a substituent effect on the BODIPY core and therefore the increase in the number of arms influences the photophysics of the material.Solid state colour converters were spin-coated from solution to make thin films on quartz substrates for the photophysical studies. Films of thickness ca. 100 nm were deposited from solutions at concentrations of 10 and 20 mg/ml for photophysical and communications measurements respectively. These were spin-coated at 1500 rpm for 60 seconds. Figure 1 (bottom) shows the absorption and PL spectra of the films for each molecule. The absorption spectra show peaks at 450 and 620 nm for Y1; 350, 473 and 626 nm for Y2; 350, 477 and 625nm for Y3; and 366, 480 and 625nm for Y4. The absorption band below 400 nm is attributed to the fluorene arms and increases in intensity with arm length. Y1 has a peak in absorption at 450 nm matching well the emission of the blue LEDs used for lighting, and this feature shifts slightly to longer wavelengths for longer arms as seen in Figure 1. The peak emission wavelengths were in the red region of the spectrum, 663, 679, 682, 682 nm for Y1, Y2, Y3and Y4 respectively. The red PL emission comes from an extended conjugation across the BODIPY core and adjacent fluorene units as has been described previously 24 . The bathochromic shift from Y1 to Y2 is also evident in solution 23,24 and indicates that there is a further delocalisation of the excited state across the BODIPY and neighbouring fluorene units.Time-resolved fluorescence measurements were conducted using the time correlated single photon counting (TCSPC) technique, exciting the materials at 375 nm and detecting at the corresponding peak PL...

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Short‐Range Wireless Communications

Cited by 9 publications

References 0 publications

Novel Fast Color-Converter for Visible Light Communication Using a Blend of Conjugated Polymers

Novel Fast Color-Converter for Visible Light Communication Using a Blend of Conjugated Polymers

Design and Development of Vehicle Collision-Avoidance System Based on UWB Wireless Sensor Networks

BODIPY star-shaped molecules as solid state colour converters for visible light communications

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