Journal articles: 'Optical wireless links'

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Boucouvalas, A. C., and P. Barker. "Asymmetry in optical wireless links." IEE Proceedings - Optoelectronics 147, no. 4 (August 1, 2000): 315–21. http://dx.doi.org/10.1049/ip-opt:20000627.

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Jose Maria Garrido Balsells, Jose Maria Garrido Balsells, Antonio Jurado-Navas¤ Antonio Jurado-Navas¤, Miguel Castillo-Vazquez Miguel Castillo-Vazquez, Ana Belen Moreno-Garrido Ana Belen Moreno-Garrido, and Antonio Puerta-Notario Antonio Puerta-Notario. "Advantages of solitonic shape pulses for full-optical wireless communication links." Chinese Optics Letters 10, no. 4 (2012): 040101–40103. http://dx.doi.org/10.3788/col201210.040101.

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Davis, C. C., I. I. Smolyaninov, and S. D. Milner. "Flexible optical wireless links and networks." IEEE Communications Magazine 41, no. 3 (March 2003): 51–57. http://dx.doi.org/10.1109/mcom.2003.1186545.

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Han, Xifeng, Long Chen, Xinying Li, Jiangnan Xiao, and Jianjun Yu. "Optical-wireless integration of W-band wireless and free-space optical links." Microwave and Optical Technology Letters 59, no. 3 (January 26, 2017): 561–63. http://dx.doi.org/10.1002/mop.30340.

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Essalih, Taha, Mohammad Ali Khalighi, Steve Hranilovic, and Hassan Akhouayri. "Optical OFDM for SiPM-Based Underwater Optical Wireless Communication Links." Sensors 20, no. 21 (October 24, 2020): 6057. http://dx.doi.org/10.3390/s20216057.

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Underwater optical wireless systems have dual requirements of high data rates and long ranges in harsh scattering and attenuation conditions. In this paper, we investigate the advantages and limitations of optical orthogonal frequency-division multiplexing (O-OFDM) signaling when a silicon photo-multiplier (SiPM) is used at the receiver in order to ensure high sensitivity. Considering a light-emitting diode (LED) transmitter and taking into account the limited dynamic range imposed by the transmitter and the SiPM receiver, we study the performance of three popular O-OFDM schemes, i.e., DC-biased, asymmetrically-clipped, and layered asymmetrically-clipped O-OFDM (DCO-, ACO-, and LACO-OFDM, respectively). We consider a constraint on transmit electrical power PTxe and take into account the required DC bias for the three considered schemes in practice, showing the undeniable advantage of ACO- and LACO-OFDM in terms of energy efficiency. For instance, for the considered SiPM and LED components, a spectral efficiency of ∼1 bps/Hz with a data rate of 20 Mbps, a link range of 70 m, and a target bit-error-rate (BER) of 10−3, ACO and LACO allow a reduction of about 10 and 6 mW, respectively, in the required PTxe, compared to DCO-OFDM. Meanwhile, we show that when relaxing the PTxe constraint, DCO-OFDM offers the largest operational link range within which a target BER can be achieved. For instance, for a target BER of 10−3 and a data rate of 20 Mbps, and considering PTxe of 185, 80, and 50 mW for DCO-, LACO-, and ACO-OFDM, respectively, the corresponding intervals of operational link range are about 81, 74.3, and 73.8 m. Lastly, we show that LACO-OFDM makes a good compromise between energy efficiency and operational range flexibility, although requiring a higher computational complexity and imposing a longer latency at the receiver.

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M.;ÖZEK, EFE. "Wireless optical links: Atmospheric effects and tracking aspects." Communications Faculty Of Science University of Ankara 46 (2001): 33–40. http://dx.doi.org/10.1501/commua1-2_0000000038.

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Siraj, M., M. I. Memon, and M. S. Khan. "Video on Demand Over Optical Wireless Communication Links." Acta Physica Polonica A 129, no. 4 (April 2016): 826–28. http://dx.doi.org/10.12693/aphyspola.129.826.

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Fuschini, Franco, Marina Barbiroli, Giovanna Calò, Velio Tralli, Gaetano Bellanca, Marco Zoli, Jinous Shafiei Dehkordi, Jacopo Nanni, Badrul Alam, and Vincenzo Petruzzelli. "Multi-Level Analysis of On-Chip Optical Wireless Links." Applied Sciences 10, no. 1 (December 25, 2019): 196. http://dx.doi.org/10.3390/app10010196.

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Networks-on-chip are being regarded as a promising solution to meet the on-going requirement for higher and higher computation capacity. In view of future kilo-cores architectures, electrical wired connections are likely to become inefficient and alternative technologies are being widely investigated. Wireless communications on chip may be therefore leveraged to overcome the bottleneck of physical interconnections. This work deals with wireless networks-on-chip at optical frequencies, which can simplify the network layout and reduce the communication latency, easing the antenna on-chip integration process at the same time. On the other end, optical wireless communication on-chip can be limited by the heavy propagation losses and the possible cross-link interference. Assessment of the optical wireless network in terms of bit error probability and maximum communication range is here investigated through a multi-level approach. Manifold aspects, concurring to the final system performance, are simultaneously taken into account, like the antenna radiation properties, the data-rate of the core-to core communication, the geometrical and electromagnetic layout of the chip and the noise and interference level. Simulations results suggest that communication up to some hundreds of μm can be pursued provided that the antenna design and/or the target data-rate are carefully tailored to the actual layout of the chip.

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Hamzeh, B., and M. Kavehrad. "OCDMA-Coded Free-Space Optical Links for Wireless Optical-Mesh Networks." IEEE Transactions on Communications 52, no. 12 (December 2004): 2165–74. http://dx.doi.org/10.1109/tcomm.2004.838735.

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Jasman, F., A. M. Zaiton, Z. Ahmad, and Z. Rihawi. "Scattering Regimes for Underwater Optical Wireless Communications using Monte Carlo Simulation." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 4 (August 1, 2018): 2571. http://dx.doi.org/10.11591/ijece.v8i4.pp2571-2577.

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<span>Optical wireless communications has shown tremendous potential for underwater applications as it can provide higher bandwidth and better security compared to acoustic technologies. In this paper, an investigation on scattering regimes for underwater links using Monte Carlo simulation has been presented.While the focus of this paper is on diffuse links, the simulation results of collimated links is also provided for comparison purpose. Three types of water namely clear, coastal and turbid water are being used in the simulation. It is shown that the effect of scattering on the path loss cannot be accurately modeled by the existing channel model; ie. Beers-Lambert (BL) law. It has been shown that the distance at which the unscattered light drops to zero can be used to estimate the transition point for the scattering regimes in case of diffuse links. The transition point for diffuse links in coastal water and turbid water can be estimated to be around 22 m and 4 m respectively. Further analysis on the scattering order probability at different scattering regimes illustrates how scattering is affected by beam size, water turbidity and distance. From the frequency response plot, it is estimated that the bandwidth of several order of GHz can be achieved when the links are operating in the minimal scattering region and will reduce to several hundreds of MHz when the link is operating in multiple scattering region.</span>

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Fischer, Jakob, Timo Schuster, Christian Wächter, Michael Luber, Juri Vinogradov, Olaf Ziemann, and Rainer Engelbrecht. "Isolated sensor networks for high-voltage environments using a single polymer optical fiber and LEDs for remote powering as well as data transmission." Journal of Sensors and Sensor Systems 7, no. 1 (March 27, 2018): 193–206. http://dx.doi.org/10.5194/jsss-7-193-2018.

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Abstract. Many applications in high voltage or explosive environments require sensors which are electrically isolated from other components of a system. These sensors need remote powering as well as wireless or isolated data transmission links. A possible solution can be based on optically powered optical sensor links. These typically employ four different photonic components: for the data communication a fast LED as a transmitter and a photo diode as a receiver, furthermore for sensor powering a high-power light source and a photonic power converter. Additionally, two optical fibers are required for optical remote powering and the optical data link. In this paper we demonstrate an optically powered optical sensor link using only low-cost high-brightness LEDs and a single polymer optical fiber (POF) for all of these tasks. Coupling efficiencies, power transmission and modulation bandwidths are analyzed for LEDs with different colors. Potentials for many mW of electrical remote powering and Mbit s−1 sensor data links are demonstrated over 10 m of POF. This approach can be used for almost any electronic sensor with moderate power requirements.

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Abumarshoud, Hanaa, Cheng Chen, Mohamed Sufyan Islim, and Harald Haas. "Optical wireless communications for cyber-secure ubiquitous wireless networks." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2242 (October 2020): 20200162. http://dx.doi.org/10.1098/rspa.2020.0162.

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Wireless connectivity is no longer limited to facilitating communications between individuals, but is also required to support diverse and heterogeneous applications, services and infrastructures. Internet of things (IoT) systems will dominate future technologies, allowing any and all devices to create, share and process data. If artificial intelligence resembles the brain of IoT, then high-speed connectivity forms the nervous system that connects the devices. For IoT to safely operate autonomously, it requires highly secure and reliable wireless links. In this article, we shed light on the potential of optical wireless communications to provide high-speed secure and reliable ubiquitous access as an enabler for fifth generation and beyond wireless networks.

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Li, Ye, Yixin Zhang, and Yun Zhu. "Capacity of underwater wireless optical links with pointing errors." Optics Communications 446 (September 2019): 16–22. http://dx.doi.org/10.1016/j.optcom.2019.04.061.

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Guerra, Victor, Julio Rufo, Jose Rabadan, and Rafael Perez-Jimenez. "Effect of moving microalgae on underwater wireless optical links." Applied Optics 59, no. 2 (January 9, 2020): 515. http://dx.doi.org/10.1364/ao.379436.

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Zhang, Huihui, Like Hui, and Yuhan Dong. "Angle of Arrival Analysis for Underwater Wireless Optical Links." IEEE Communications Letters 19, no. 12 (December 2015): 2162–65. http://dx.doi.org/10.1109/lcomm.2015.2484351.

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Nanni, Jacopo, Gaetano Bellanca, Giovanna Calo, Badrul Alam, Ali Emre Kaplan, Marina Barbiroli, Franco Fuschini, et al. "Multi-Path Propagation in On-Chip Optical Wireless Links." IEEE Photonics Technology Letters 32, no. 17 (September 1, 2020): 1101–4. http://dx.doi.org/10.1109/lpt.2020.3012877.

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Tang, Shijian, Yuhan Dong, and Xuedan Zhang. "Impulse Response Modeling for Underwater Wireless Optical Communication Links." IEEE Transactions on Communications 62, no. 1 (January 2014): 226–34. http://dx.doi.org/10.1109/tcomm.2013.120713.130199.

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Ashraf, Javed, Anil Kumar, and Mumtaz A. Khan. "Optimising the Performance of Diffuse Indoor Optical Wireless Links." International Journal of Engineering Science and Technology 10, no. 1 (January 31, 2018): 1–8. http://dx.doi.org/10.21817/ijest/2018/v10i1/181001005.

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19

Green, Roger J., C. Sweet, and S. Idrus. "Optical wireless links with enhanced linearity and selectivity [Invited]." Journal of Optical Networking 4, no. 10 (2005): 671. http://dx.doi.org/10.1364/jon.4.000671.

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20

Xu, Fang, Ali Khalighi, Patrice Caussé, and Salah Bourennane. "Channel coding and time-diversity for optical wireless links." Optics Express 17, no. 2 (January 12, 2009): 872. http://dx.doi.org/10.1364/oe.17.000872.

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Elmabrok, Osama, Masoud Ghalaii, and Mohsen Razavi. "Quantum-classical access networks with embedded optical wireless links." Journal of the Optical Society of America B 35, no. 3 (February 6, 2018): 487. http://dx.doi.org/10.1364/josab.35.000487.

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22

Yiannopoulos, Konstantinos, Nikos C. Sagias, and Anthony C. Boucouvalas. "On the Performance of Semiconductor Optical Amplifier-Assisted Outdoor Optical Wireless Links." IEEE Journal on Selected Areas in Communications 33, no. 9 (September 2015): 1869–76. http://dx.doi.org/10.1109/jsac.2015.2433052.

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23

Koonen, Ton, Ketemaw Mekonnen, Zizheng Cao, Frans Huijskens, Ngoc Quan Pham, and Eduward Tangdiongga. "Ultra-high-capacity wireless communication by means of steered narrow optical beams." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (March 2, 2020): 20190192. http://dx.doi.org/10.1098/rsta.2019.0192.

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The optical spectrum offers great opportunities to resolve the congestion in radio-based communication, aggravated by the booming demand for wireless connectivity. High-speed infrared optical components in the 1500 nm window have reached high levels of sophistication and are extensively used already in fibre-optic networks. Moreover, infrared light beyond 1400 nm is eye-safe and is not noticeable by the users. Deploying steerable narrow infrared beams, wireless links with huge capacity can be established to users individually, at minimum power consumption levels and at very high levels of privacy. Fully passive diffractive optical modules can handle many beams individually and accurately steer narrow beams two-dimensionally by just remotely tuning the wavelength of each beam. The system design aspects are discussed, encompassing the beam-steering transmitter, wide field-of-view optical receiver and the localization of the user's wireless devices. Prototype system demonstrators are reported, capable of supporting up to 128 beams carrying up to 112 Gbit s −1 per beam. Hybrid bidirectional systems which use a high-speed downstream optical link and an upstream radio link at a lower speed can provide powerful asymmetric wireless connections. All-optical bidirectional beam-steered wireless communication will be able to offer the ultimate in wireless capacity to the user while minimizing power consumption. This article is part of the theme issue ‘Optical wireless communication’.

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Li, Yiming, Haodong Liang, Chao Gao, Maoke Miao, and Xiaofeng Li. "Temporal dispersion compensation for turbid underwater optical wireless communication links." Optics Communications 435 (March 2019): 355–61. http://dx.doi.org/10.1016/j.optcom.2018.11.062.

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Zhang, Huihui, and Yuhan Dong. "Impulse response modeling for general underwater wireless optical MIMO links." IEEE Communications Magazine 54, no. 2 (February 2016): 56–61. http://dx.doi.org/10.1109/mcom.2016.7402261.

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Sandalidis, Harilaos. "Optimization Models for Misalignment Fading Mitigation in Optical Wireless Links." IEEE Communications Letters 12, no. 5 (May 2008): 395–97. http://dx.doi.org/10.1109/lcomm.2008.071788.

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Fahs, Bassem, Matthew Romanowicz, Jacob Kim, and Mona M. Hella. "A Self-Alignment System for LOS Optical Wireless Communication Links." IEEE Photonics Technology Letters 29, no. 24 (December 15, 2017): 2207–10. http://dx.doi.org/10.1109/lpt.2017.2771303.

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Huang, Nuo, Jun-Bo Wang, Jiangzhou Wang, Cunhua Pan, Houyu Wang, and Ming Chen. "Receiver Design for PAM-DMT in Indoor Optical Wireless Links." IEEE Photonics Technology Letters 27, no. 2 (January 15, 2015): 161–64. http://dx.doi.org/10.1109/lpt.2014.2363876.

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29

Sabella, R. "Performance analysis of wireless broadband systems employing optical fiber links." IEEE Transactions on Communications 47, no. 5 (May 1999): 715–21. http://dx.doi.org/10.1109/26.768765.

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Baykal, Yahya. "SNR advantage of anisotropy in oceanic optical wireless communications links." Journal of the Optical Society of America A 36, no. 12 (November 13, 2019): 1991. http://dx.doi.org/10.1364/josaa.36.001991.

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Zibar, Darko, Rakesh Sambaraju, Ruben Alemany, Antonio Caballero, Javier Herrera, and Idelfonso T. Monroy. "Radio-Frequency Transparent Demodulation for Broadband Hybrid Wireless-Optical Links." IEEE Photonics Technology Letters 22, no. 11 (June 2010): 784–86. http://dx.doi.org/10.1109/lpt.2010.2045752.

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32

Surampudi, Atchutananda, Ravinder Singh, Grahame Faulkner, Dominic O'Brien, and Steve Collins. "Raised Cosine Pulse Shaping for Pre-equalized Optical Wireless Links." IEEE Photonics Technology Letters 33, no. 16 (August 15, 2021): 912–15. http://dx.doi.org/10.1109/lpt.2021.3069115.

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Roumelas, George D., Hector E. Nistazakis, Argyris N. Stassinakis, George K. Varotsos, Andreas D. Tsigopoulos, and George S. Tombras. "Time Jitter, Turbulence and Chromatic Dispersion in Underwater Optical Wireless Links." Technologies 8, no. 1 (December 22, 2019): 3. http://dx.doi.org/10.3390/technologies8010003.

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The performance of an underwater optical wireless communication link is investigated by taking into account—for the first time and to the best of our knowledge—the simultaneous influence of the chromatic dispersion, the time jitter and the turbulence effects, by assuming chirped longitudinal Gaussian pulse propagation as information carriers. The estimation procedure is presented and a novel probability density function is extracted in order to describe the irradiance fluctuations at the receiver side. Furthermore, the availability of the link is investigated by means of its probability of fade and various numerical results are presented using typical parameters for the underwater optical wireless communication systems.

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Hussien, Anas Ali, and Adnan Hussein Ali. "Comprehensive investigation of coherent optical OFDM-RoF employing 16QAM external modulation for long-haul optical communication system." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 3 (June 1, 2020): 2607. http://dx.doi.org/10.11591/ijece.v10i3.pp2607-2616.

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Given the growing need for long haul transmission that requires a high rate of data, the orthogonal frequency division multiplexing scheme (OFDM), is regarded as a technique with high potentials for high-capacity optical networks. OFDM transmits over both optical and wireless channels, with the data distributed over a huge amount of the subcarrier, and the data is distributed over a huge number of subcarriers. OFDM achieves RF signal for a long-haul transmitting by utilizing Radio over Fiber (RoF) system, which is known to produce higher orthogonality of the OFDM modulated signal designed for the wireless network. RoF systems comprise of heterogeneous networks designed through the use of wireless and optical links. The aim of this paper is to carry out an investigation of the performance of the external modulation in RoF links, while analyzing the shortcomings caused by the various elements of the optical system. The Mach–Zehnder modulator (MZM) can be applied in external modulation, and exhibits a more robust performance when implemented with the OFDM modulation technique.

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Varotsos, George K., Hector E. Nistazakis, Konstantinos Aidinis, Fadi Jaber, Mohd Nasor, and Kanhira Kadavath Mujeeb Rahman. "Error Performance Estimation of Modulated Retroreflective Transdermal Optical Wireless Links with Diversity under Generalized Pointing Errors." Telecom 2, no. 2 (April 1, 2021): 167–80. http://dx.doi.org/10.3390/telecom2020011.

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Recent developments in both optical wireless communication (OWC) systems and implanted medical devices (IMDs) have introduced transdermal optical wireless (TOW) technology as a viable candidate for extremely high-speed in-body to out-of-body wireless data transmissions, which are growing in demand for many vital biomedical applications, including telemetry with medical implants, health monitoring, neural recording and prostheses. Nevertheless, this emerging communication modality is primarily hindered by skin-induced attenuation of the propagating signal bit carrier along with its stochastic misalignment-induced fading. Thus, by considering a typical modulated retroreflective (MRR) TOW system with spatial diversity and optimal combining (OC) for signal reception in this work, we focus, for the first time in the MRR TOW literature, on the stochastic nature of generalized pointing errors with non-zero boresight (NZB). Specifically, under these circumstances, novel analytical mathematical expressions were derived for the total average bit error rate (BER) of various system configurations. Their results revealed significant outage performance enhancements when spatial diversity was utilized. Moreover, taking into consideration the total transdermal pathloss along with the effects of stochastic NZB pointing errors, the critical average signal-to-noise ratio (SNR) metric was evaluated for typical power spectral-density values.

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36

Grigoriu, Liliana. "Availability of a Hybrid FSO/RF Link While Using the Link’s Diversity for Packet Scheduling." Wireless Communications and Mobile Computing 2018 (May 31, 2018): 1–12. http://dx.doi.org/10.1155/2018/7320989.

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Hybrid-free space optical and radio frequency wireless links are a way of providing reliable transport of real-time traffic in outdoor wireless environments. We consider a link layer protocol that assigns packets to each physical channel of such a hybrid link, which first attempts to send each packet over one of the links (the main link) and, if unsuccessful, sends the packet over the other link (the backup link). The hybrid link processes high-priority traffic by using the link layer protocol and additional (background) traffic at low priority over the backup link. In this setting, high-priority traffic can be transmitted at a rate as high as the maximum capacity of the main link, assuming that the backup link can compensate for main link capacity deterioration, with no need for reconfigurations aimed at adapting to changes in weather conditions, which is an advantage over other approaches. From the perspective of link availability for high-priority traffic, we compare our approach to using another protocol that does not require reconfigurations, which could be employed if the backup link is expected to have a constant transmission rate during the time interval of interest. For situations where both links can be represented by finite-state Markov models with states corresponding to channel bit error rates, as has been done in previous literature for radio frequency links and for free space optical links affected by strong atmospheric turbulence and Gaussian noise, we give a way to provide probabilistic quality of service guarantees for background traffic assuming that the high-priority traffic is insured to not exceed a given constant rate.

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Baykal, Yahya. "Anisotropy effect on performance of PPM optical wireless oceanic communication links." Journal of Quantitative Spectroscopy and Radiative Transfer 228 (May 2019): 73–78. http://dx.doi.org/10.1016/j.jqsrt.2019.02.026.

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Boucouvalas, A. C. "Indoor ambient light noise and its effect on wireless optical links." IEE Proceedings - Optoelectronics 143, no. 6 (December 1, 1996): 334–38. http://dx.doi.org/10.1049/ip-opt:19960881.

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39

Esmail, Maged Abdullah, Habib Fathallah, and Mohamed-Slim Alouini. "On the Performance of Optical Wireless Links Over Random Foggy Channels." IEEE Access 5 (2017): 2894–903. http://dx.doi.org/10.1109/access.2017.2670682.

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Tsiftsis, Theodoros A., Harilaos G. Sandalidis, George K. Karagiannidis, and Murat Uysal. "Optical wireless links with spatial diversity over strong atmospheric turbulence channels." IEEE Transactions on Wireless Communications 8, no. 2 (February 2009): 951–57. http://dx.doi.org/10.1109/twc.2009.071318.

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Basahel, Ahmed, Md Rafiqul Islam, Mohamed Habaebi, and Suriza Ahmad. "Availability Prediction Methods for Terrestrial Free-Space-Optical Link Under Tropical Climate." Indonesian Journal of Electrical Engineering and Computer Science 10, no. 1 (April 1, 2018): 224. http://dx.doi.org/10.11591/ijeecs.v10.i1.pp224-229.

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<p>Free-space optical (FSO) links provide high speed point-to-point wireless communication, but its availability can easily be affected by weather conditions. In heavy rainfall regions, FSO links are relatively sensitive to rain. Availability prediction of FSO is indispensable part, especially in tropical areas. In this paper, methods to predict FSO link availability are presented. The overall performance of FSO link is described in terms of the availability that can be achieved over anticipated link distance. The availability prediction methods demonstrated for an FSO link ranges up to 5 km. The availability prediction methods are based on long-term statistics of atmospheric attenuations and FSO link budget under tropical climate condition. In tropical regions, for a terrestrial FSO link, carrier class availability can be achieved over a few hundred meters only; whereas enterprise class availability can be achieved over a few kilometers link distances. </p>

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Nikkhah, Hamdam, Karel Van Acoleyen, and Roel Baets. "Beam steering for wireless optical links based on an optical phased array in silicon." annals of telecommunications - annales des télécommunications 68, no. 1-2 (June 15, 2012): 57–62. http://dx.doi.org/10.1007/s12243-012-0313-z.

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Thirupathaiah, Kola, Brijesh Iyer, Nagendra Prasad Pathak, and Vipul Rastogi. "Concurrent Dualband Diplexer for Nanoscale Wireless Links." IEEE Photonics Technology Letters 26, no. 18 (September 15, 2014): 1832–35. http://dx.doi.org/10.1109/lpt.2014.2337016.

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Rapaport, Liat, Ariel Etinger, Boris Litvak, Gad Pinhasi, and Yosef Pinhasi. "Quasi Optical Multi-Ray Model For Wireless Communication Link in Millimeter Wavelengths." MATEC Web of Conferences 210 (2018): 03006. http://dx.doi.org/10.1051/matecconf/201821003006.

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The spectrum of millimeter waves lay above 30GHz. The band between 30GHz up to 300GHz is called Extremely High Frequencies (EHF). This wide spectrum is relatively free of users and have recently became relevant for realizations of wireless communications an radars, including the fifth generation (5G) of cellular communications. Due to the short wavelengths, the propagation of millimeter waves can be analyzed using quasi-optical ray techniques. We present a multi-ray analysis of millimeter wave wireless link in the presence of multipath. The analysis is applicable for indoor and outdoor links and considers reflections from walls and buildings. It is shown that line-of-sight is not necessarily required in scenarios where multiple reflections exist as in long corridors, canyons and tunnels. The theoretical results are verified experimentally with a link in the W-band (94GHz).

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45

Wang, Zhaocheng, and Jiaxuan Chen. "Networked multiple-input-multiple-output for optical wireless communication systems." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (March 2, 2020): 20190189. http://dx.doi.org/10.1098/rsta.2019.0189.

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With the escalation of heterogeneous data traffic, the research on optical wireless communication (OWC) has attracted much attention, owing to its advantages such as wide spectrum, low power consumption and high security. Ubiquitous optical devices, e.g. light-emitting diodes (LEDs) and cameras, are employed to support optical wireless links. Since the distribution of these optical devices is usually dense, multiple-input-multiple-output (MIMO) can be naturally adopted to attain spatial diversity gain or spatial multiplexing gain. As the scale of OWC networks enlarges, optical MIMO can also collaborate with network-level operations, like user/AP grouping, to enhance the network throughput. Since OWC is preferred for short-range communications and is sensitive to the directions/rotations of transceivers, optical MIMO links vary frequently and sharply in outdoor scenarios when considering the mobility of optical devices, raising new challenges to network design. In this work, we present an overview of optical MIMO techniques, as well as the cooperation of MIMO and user/AP grouping in OWC networks. In consideration of the challenges for outdoor OWC, key technologies are then proposed to facilitate the adoption of optical MIMO in outdoor scenarios, especially in vehicular ad hoc networks. Lastly, future applications of MIMO in OWC networks are discussed. This article is part of the theme issue ‘Optical wireless communication’.

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Varotsos, George K., Hector E. Nistazakis, Konstantinos Aidinis, Fadi Jaber, and K. K. Mujeeb Rahman. "Signal Intensity Estimation in Transdermal Optical Wireless Links with Stochastic Pointing Errors Effect." Technologies 8, no. 4 (October 30, 2020): 60. http://dx.doi.org/10.3390/technologies8040060.

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Transdermal optical wireless (TOW) communication links have recently gained particular research and commercial attention as a viable alternative for establishing high speed and effective implantable data transmissions, which is vital for a variety of neuroprosthetic and other medical applications. However, the development of this optical telemetry modality with medical implanted devices (IMDs) is adversely affected by skin-induced photon absorption, scattering and pointing errors effects. Thus, in this work a minimum mean-square error (MMSE) criterion is proposed for the estimation of the optical signal intensity in a typical TOW link of varying path loss and misalignment-induced fading characteristics. In this context, the stochastic nature of the transmitter–receiver misalignment has been considered and jointly modeled with transdermal path loss. Additionally, the link is assumed to employ the suitable On–Off Keying (OOK) with intensity modulation and direct detection scheme as well as a PIN photodiode at the receiver side for signal detection. Under these assumptions the results demonstrate that the stochastic amount of pointing mismatch strongly affects the received irradiance estimation.

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Tomaszewski, Artur. "Design of Optical Wireless Networks with Fair Traffic Flows." Journal of Applied Mathematics 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/938483.

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The paper presents a method for optimising the wireless optical network that carries elastic packet traffic. The particular focus is on modelling the effect of elastic traffic flows slowing down in response to the decrease of the optical transmission systems’ capacity at bad weather conditions. A mathematical programming model of the network design problem is presented that assumes that the packet rates of elastic traffic flows decrease fairly. While practically any subset of network links can be simultaneously affected by unfavourable transmission conditions, a particular challenge of solving the problem results from a huge number of network states considered in the model. Therefore, how the problem can be solved by generating the most unfavourable network states is presented. Moreover, it is proved that it is entirely sufficient to consider only the states that correspond to the decrease of capacity on a single link. Finally, as the general problem is nonlinear, it is shown that the problem can be transformed to a linear MIP problem and solved effectively when single-path routing of traffic flows is assumed.

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Duroc, Yvan, and Gianfranco Andia Vera. "Considerations on the backscattered wireless communication links." Microwave and Optical Technology Letters 55, no. 3 (January 28, 2013): 554–59. http://dx.doi.org/10.1002/mop.27367.

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Chen, Chun Yi, Hua Min Yang, Yan Lou, and Zhen Gang Jiang. "Non-Uniform Spectral Amplitude Encoding for Optical Wireless Communication Links through Atmospheric Turbulence." Applied Mechanics and Materials 241-244 (December 2012): 2192–95. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2192.

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The performance of optical wireless communication (OWC) links based on the spectral amplitude encoding (SAE) of a broad-band spatially partially coherent beam through atmospheric turbulence is analyzed. It has been found that the power efficiency of transmitters of OWC links based on the non-uniform SAE is higher than that based on the uniform SAE. Further, the spectrum division method for the non-uniform SAE of broad-band beams has been proposed. The non-uniform SAE of a broad-band spatially partially coherent beam is an effective method to reduce the performance degradation of OWC links caused by atmospheric turbulence.

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Kotiang, Stephen, and Jae Ho Choi. "Accurate Characterization of Raindrop Size on the Performance of Optical Wireless Communication Links." Applied Mechanics and Materials 666 (October 2014): 317–21. http://dx.doi.org/10.4028/www.scientific.net/amm.666.317.

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Rain attenuation is one of the impairments on the performance of optical wireless communication systems, and an accurate estimation of optical extinction coefficient due to rain in an area is an important factor for setting up a reliable communication link. In this paper, a relationship between optical signal attenuation and rain intensity is derived based on the moment of method of raindrop size distribution using a three-parameter gamma model. Finally, analyticalresultsarecompared to those ofthe ITU-R model.

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Journal articles on the topic 'Optical wireless links'

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