Log in

Relevant bibliographies by topics / Underwater wireless optical communication / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Underwater wireless optical communication.

Dissertations / Theses on the topic 'Underwater wireless optical communication'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Underwater wireless optical communication.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Zeng, Zhaoquan. "A survey of underwater wireless optical communication." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55675.

Full text

Abstract:

Underwater wireless communication refers to transmitting data in unguided water environment through the use of wireless carriers, i.e., radio-frequency wave, acoustic wave, and optical wave. We focus, in this thesis, on the underwater wireless optical communication (UWOC) that employs optical wave as the transmission carriers. In comparison to RF and acoustic counterparts, UWOC has a much higher transmission bandwidth, thus providing much higher data rate. Due to this high-speed transmission advantage, UWOC has attracted considerable attention in recent years. Many potential applications of UW

APA, Harvard, Vancouver, ISO, and other styles

2

Brundage, Heather. "Designing a wireless underwater optical communication system." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/57699.

Full text

Abstract:

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 61-63).<br>Though acoustic modems have long been the default wireless communication method for underwater applications due to their long range, the need for high speed communication has prompted the exploration of non-acoustic methods that have previously been overlooked due to their distance limitations. One scenario that drives this need is the monitoring of deep sea oil wells by AUVs that could be stationed at the we

APA, Harvard, Vancouver, ISO, and other styles

3

Marco, Rider Jaime. "Optical communication with underwater snake robots : Design and implementation of an underwater wireless optical communication system." Thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-37803.

Full text

Abstract:

Eelume AS is a norwegian company that develops autonomous underwater vehicles. Their flagship model is an underwater snake robot that performs inspection, maintenance and repair operations. For the time being, Eelume has been using acoustic communications between their AUV's and the docking station, but it has a big drawback: bandwidth. Eelume is interested in streaming live high-quality video from their AUV's to the docking station, which requires several megabits per second. As underwater radio frequency communications are not possible, wireless optical communications seem to be the best ava

APA, Harvard, Vancouver, ISO, and other styles

4

Jasman, Faezah. "Modelling and characterisation of short range underwater optical wireless communication channels." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/82113/.

Full text

Abstract:

This thesis studies the modelling and characterisation of underwater optical wireless communication links, particularly short-range diffuse links, by using numerical Monte Carlo (MC) simulation. MC simulation provides a flexible, intuitive and accurate modelling of the underwater channel, which is severely affected by absorption and scattering processes. In diffuse Underwater Optical Wireless Communication (UOWC) links, scattering is expected to have a larger impact on communication link performance due to the wider beam divergence compared to collimated beams. Thus, this thesis will investiga

APA, Harvard, Vancouver, ISO, and other styles

5

Doniec, Marek Wojciech. "Autonomous underwater data muling using wireless optical communication and agile AUV control." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79211.

Full text

Abstract:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 187-197).<br>Underwater exploration and surveillance currently relies on subsea cables and tethers to relay data back to the user. The cause for this is that water heavily absorbs most electromagnetic signals, preventing effective radio communication over large distances, and that underwater communication with acoustic signals affords only bit rates on the the order of Kilobits per second. In this

APA, Harvard, Vancouver, ISO, and other styles

6

Ahmad, Zahir Uddin. "Underwater optical wireless sensor network." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/60562/.

Full text

Abstract:

The thesis details the development of a short range, multi-hop underwater optical wireless sensor network. Multi-hop underwater optical wireless communication using a line of sight (LOS) link can provide a greater range compared to a single hop network, and provide physically secure connections for underwater sensor networks. This kind of system can be very power efficient, and supported data rate can be from tens of kbps up to a few hundred kbps. The aims were to build a cheap communication prototype using “off the shelf” components, such as a microcontroller, optoelectronics etc. for demonst

APA, Harvard, Vancouver, ISO, and other styles

7

Johnson, Laura J. "Optical property variability in the underwater optical wireless channel." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77522/.

Full text

Abstract:

This thesis details an investigation into the variability of optical properties within the aquatic medium and its consequence for optical wireless communication systems. The principle aim is to aid the optimisation of optical wireless for underwater links through the application of oceanographic light propagation models, where optical property variations that occur within common communication ranges are emphasised. This kind of approach is not typical within the underwater optical wireless community where variability between different natural waters has been considered but, so far, not within

APA, Harvard, Vancouver, ISO, and other styles

8

Jiang, Junyi. "Optical wireless communication systems." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387239/.

Full text

Abstract:

In recent years, Optical Wireless (OW) communication techniques have attracted substantial attention as a benefit of their abundant spectral resources in the optical domain, which is a potential solution for satisfying the ever-increasing demand for increased wireless capacity in the conventional Radio Frequency (RF) band. Motivated by the emerging techniques and applications of OW communication, the Institute of Electrical and Electronics Engineers (IEEE) had released the IEEE standard 802.15.7 for short-range optical wireless communications, which categorised the Physical layer (PHY) of the

APA, Harvard, Vancouver, ISO, and other styles

9

Du, Hao. "Optical wireless MIMO communication." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/70945/.

Full text

Abstract:

This thesis provides an in-depth investigation and evaluation of infrared optical wireless MIMO communication systems to be applied in both indoor and outdoor environment. The principle objective of the research is to demonstrate both the advantages and disadvantages of the optical wireless MIMO systems using different modulation types. The first part provided analyses of important OW configurations using APD receivers using WMC model and SISO, MISO, SIMO and MIMO configuration. Thus, an analytical expression for 2-1 MISO, 1-2 SIMO and MIMO was successfully developed. This part also illustrate

APA, Harvard, Vancouver, ISO, and other styles

10

Alhartomi, Mohammed. "Collaborative optical wireless communication systems." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/13153/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Islam, Kazi Y. "Wireless communication in harsh environments." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2722.

Full text

Abstract:

The ability to communicate underwater is a lucrative capability for industries, academia and the military. In these sectors, underwater wireless communications (UWC) are used for a variety of applications, such as oil and gas exploration, the monitoring of undersea pipelines, oceanography, seismology, undersea surveillance, and the detection of mines. However, many of these undersea activities are deterred due to numerous challenges posed by the harsh underwater environment. Energy scarcity is one of the major challenges, as frequent recharging of underwater depleted nodes is not practical. En

APA, Harvard, Vancouver, ISO, and other styles

12

Tate, William R. "Full-duplex underwater networking." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FTate.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Parand, Farivar. "Cellular optical wireless communications systems." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270654.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Azim, Ali Waqar. "Signal Processing Techniques for Optical Wireless Communication Systems." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT059/document.

Full text

Abstract:

Le spectre radiofréquence (RF) diminue en raison d'une augmentation de la demande d'applications sans fil. Par conséquent, il existe une demande importante de régions de spectre alternatifs pour les communications afin d'incliner le spectre RF conventionnel. Dans ce contexte, les communications optiques sans fil (OWC) sont explorées comme un candidat potentiel pour compléter les communications RF. Le travail actuel se concentre sur les techniques d'atténuation des déficiences et les approches de modulation efficaces en énergie pour OWC. Dans un premier temps, on étudie le rapport de puissance

APA, Harvard, Vancouver, ISO, and other styles

15

Zeng, Yu. "Adaptive modulation schemes for optical wireless communication systems." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3837/.

Full text

Abstract:

High-speed wireless optical communication links have become more popular for personal mobile applications. This is a consequence of the increasing demand from the personal information service boom. Compared to the radio frequency domain, optical wireless communication offers much higher speeds and bit rates per unit power consumption. As stated by the official infrared standard IrDA optical communication enjoys much lower power consumption than Bluetooth, with an inherent security feature while in Line of Sight (LOS) applications. There are also drawbacks such as the infrared radiation cannot

APA, Harvard, Vancouver, ISO, and other styles

16

Gatri, Aymen. "Performance optimisation mechanisms for optical wireless communication systems." Thesis, Northumbria University, 2017. http://nrl.northumbria.ac.uk/36263/.

Full text

Abstract:

In this day and age, free space optical (FSO) enable the deployment of a new category of products that can transmit voice, data, and video at bandwidths up to 2.5 Gbps at distances up to 4 km, over any protocol. This optical connectivity doesn’t require expensive fibre-optic cable or spectrum licenses. FSO is reliable due to the capability of FSO systems to provide truly broadband and secure communications, as well as their immunity to interference from other sources of optical radiation. The principal challenge facing FSO technology is to achieve 100% link availability in all weather conditio

APA, Harvard, Vancouver, ISO, and other styles

17

Alfitouri, Abdurrahman. "Design and analysis of gateway systems over wireless and underwater communication channels." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/design-and-analysis-of-gateway-systems-over-wireless-and-underwater-communication-channels(05ff0b83-a829-4451-99ae-b992b5674812).html.

Full text

Abstract:

Gateways play a major role in communications over two-hop wireless or hybrid systems. For instance, indoor-outdoor communication networks, satellite communications, and hybrid underwater-wireless communications. It can extend the coverage of cellular systems, and connect the isolated users in rural areas. This thesis considers mainly four different themes. Firstly, the design and performance analysis of a single gateway equipped with a single antenna was investigated over different wireless channel models. The gateway uses random access protocol to connect a random number of independent non-co

APA, Harvard, Vancouver, ISO, and other styles

18

Alexander, Joshua L. "A Microcontroller-based, Optically-centric Communication System for Underwater Applications." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868704379707.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Ogunkoya, Funmilayo Bimpe. "PAPR reduction for OFDM in optical wireless communication systems." Thesis, Glasgow Caledonian University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.726783.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Abaza, Mohamed. "Cooperative MIMO techniques for outdoor optical wireless communication systems." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0073/document.

Full text

Abstract:

Au cours de la dernière décennie, les communications optiques en espace libre (FSO) ont pris de l’ampleur dans les deux domaines académiques et industriels. L’importance de FSO s’appuie sur la possibilité de faire un système de transmission économique et écologique avec un débit élevé et sans licence à l’opposition des systèmes de transmission radiofréquences (RF). Dans la plupart des travaux antécédents sur les systèmes multi-émetteurs, seulement les canaux décorrélés ont été considérés. Un canal décorrélé nécessite un espace suffisant entre les émetteurs. Cette condition devient difficile et

APA, Harvard, Vancouver, ISO, and other styles

21

Mahdy, Ahmed M. "A broadband infrastructure for ad hoc networks with optical wireless." [Lincoln, Neb. : University of Nebraska-Lincoln], 2005. http://0-www.unl.edu.library.unl.edu/libr/Dissertations/2005/MahdyDis.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Zhu, Ming. "High-capacity communication systems using advanced optical and wireless technologies." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53525.

Full text

Abstract:

The increasing traffic demand from the use of 3G/4G, streaming, and other broadband wireless services exposes existing bottlenecks in the communications infrastructure and the coordination between the wireless network and its wired counterpart. While wireless systems are constantly evolving to newer generations and higher capacities, their supporting wired networks urgently require advancements in both architecture design and enabling technologies. New optical access systems specifically tailored for the unique natures of various wireless standards are investigated. This dissertation presents

APA, Harvard, Vancouver, ISO, and other styles

23

Hayes, Andrew Robert. "Digital pulse interval modulation for indoor optical wireless communication systems." Thesis, Sheffield Hallam University, 2002. http://shura.shu.ac.uk/7263/.

Full text

Abstract:

Over the past decade, infrared has attracted a considerable amount of interest as an alternative medium to radio for short-range indoor wireless local area networks. Infrared offers a number of significant advantages over its radio frequency counterpart, such as the abundance of bandwidth that is currently unregulated worldwide, the availability of low cost emitters and detectors, inherent security and resistance to multi path fading. The work presented in this thesis focuses on modulation techniques, the fundamental aim being to assess the suitability of digital pulse interval modulation (DPI

APA, Harvard, Vancouver, ISO, and other styles

24

Abu, Almaalie Zina. "Free space optical wireless communication with physical layer network coding." Thesis, Northumbria University, 2016. http://nrl.northumbria.ac.uk/32546/.

Full text

Abstract:

Terrestrial free-space optical (FSO) communications is an emerging low-cost, licensefree and high-bandwidth access solution for a number of applications including the “last mile” access network. However, for a transmission range from a few meter to longer than 1 km, a number of atmospheric phenomena, such as rain, haze, fog, snow, scintillation and pointing errors become a major performance limiting factors in FSO systems resulting in link deterioration and ultimately complete link failure. Relay-assisted technique is capable of mitigating the signal fading and maintain acceptable performance

APA, Harvard, Vancouver, ISO, and other styles

25

Alsaadi, Fuad Eid S. "MIMO MC-CDMA systems over indoor optical wireless communication channels." Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/1902/.

Full text

Abstract:

Optical wireless communication systems offer a number of advantages over their radio frequency counterparts. The advantages include freedom from fading, freedom from spectrum regulations and abundant bandwidth. The main limitations of optical wireless systems include background noise attributed to natural and artificial light sources and multipath propagation. The former degrades the signal to noise ratio while the latter limits the maximum achievable data rate. This thesis investigates the use of transmit power adaptation in the design of optical wireless spot-diffusing systems to increase th

APA, Harvard, Vancouver, ISO, and other styles

26

Boldrini, Leonardo. "Camera Based Localization for Indoor Optical Wireless Networks." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20240/.

Full text

Abstract:

The main focus of this work is to implement device localization in an indoor communication network which employs short range Optical Wireless Communication (OWC) using pencil beams. OWC is becoming increasingly important as a solution to the shortage of available radio spectrum. In order to counter this problem, a radical new approach is proposed by performing wireless communication using optical rather than radio techniques, by deploying optical pencil beam technologies to provide users with access to an indoor optical fiber infrastructure. An architecture based on free-space optics has been

APA, Harvard, Vancouver, ISO, and other styles

27

Liu, Yi. "The performance of future wireless communication systems." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:a2f0b75e-3b0d-406e-af1b-6c5038c18fae.

Full text

Abstract:

Multimedia services provided through wireless networks, such as mobile television and video calls, have recently attracted great attention. These systems require higher data rates, better communication quality, and wider channel bandwidth compared with traditional wireless network services, such as voice calling and text messaging. In response to these demands, multiple-input multiple-output (MIMO) employing multiple antennas at both transmitter and receiver, has been investigated in recent years. Nevertheless, the major impediment in MIMO based wireless systems is the cost of the hardware due

APA, Harvard, Vancouver, ISO, and other styles

28

Gatri, Aymen [Verfasser]. "Next Generation Optical Wireless Communication Systems : A Systems Approach / Aymen Gatri." Hamburg : disserta Verlag, 2019. http://d-nb.info/1199410845/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Hoang, Thai Bang. "Infrared and visible wireless optical technology for body sensor connectivity." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0027/document.

Full text

Abstract:

Cette thèse est axée sur le domaine de la communication optique sans fil en intérieur pour la surveillance de la santé basée sur des capteurs corporels. L’état de l'art des communications optique sans fil dans les domaines infrarouge, visible et UV ainsi que l'analyse des systèmes liés à la santé utilisant cette technologie ont été fournis. Cela a permis de définir les objectifs et l'orientation de cette thèse. Nous avons étudié l'utilisation de la technologie infrarouge pour la transmission de données entre un capteur porté par un patient et des récepteurs situés aux coins d'un panneau d'écla

APA, Harvard, Vancouver, ISO, and other styles

30

Ketprom, Urachada. "Line-of-sight propagation of optical wave through multiple-scatter channel in optical wireless communication system /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/6057.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

He, Jingyi. "Routing and channel assignment in optical and wireless networks /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20HE.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Yu, Zhenhua. "Optical wireless communications with optical power and dynamic range constraints." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51784.

Full text

Abstract:

Along with the rapidly increasing demand for wireless data while more and more crowded radio frequency (RF) spectrum, optical wireless communications (OWC) become a promising candidate to complement conventional RF communications, especially for indoor short and medium range data transmissions. Orthogonal frequency division multiplexing (OFDM) is considered for OWC due to its ability to boost data rates. However, the average emitted optical power and dynamic range of driving signals of LEDs are two major constraints in OWC. OFDM waveforms exhibits high upper and lower peak-to-average power rat

APA, Harvard, Vancouver, ISO, and other styles

33

Agarwal, Rahul. "Low temperature hermetically sealed 3-D MEMS device for wireless optical communication." [Tampa, Fla] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002181.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Zhang, Qian. "Block error rate of optical wireless communication systems over atmospheric turbulence channels." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44187.

Full text

Abstract:

Optical wireless communication (OWC) is an innovative and promising technology introduced in recent decades, and it can be used for both indoor and outdoor applications. Outdoor OWC is also an attractive solution to the access network bottle-neck. However, challenges can arise for OWC links with increased atmospheric turbulence levels due to time-varing temperatures and pressures, resulting fading or scintillation. This thesis studies and analyzes the block error rate performance of subcarrier intensity modulation based OWC systems employing both noncoherent and coherent binary modulations ove

APA, Harvard, Vancouver, ISO, and other styles

35

Aldibbiat, Nawras Mohamed. "Optical wireless communication systems employing dual header pulse interval modulation (DH-PIM)." Thesis, Sheffield Hallam University, 2001. http://shura.shu.ac.uk/7117/.

Full text

Abstract:

Indoor optical wireless communication systems have been shown to be viable alternatives to radio systems for indoor networks because optical wireless systems offer a huge unlicensed bandwidth, high data rates, secure connectivity, immunity to electromagnetic interference and prevention from multipath fading. However, optical wireless systems are subject to multipath distortion and are governed by eye safety standards. Therefore, a modulation scheme is required that is capable of providing high speed and good immunity to multipath dispersion on indoor optical channels. In this thesis, a critica

APA, Harvard, Vancouver, ISO, and other styles

36

Jia, Zhensheng. "Optical millimeter-wave signal generation, transmission and processing for symmetric super-broadband optical-wireless access networks." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24640.

Full text

Abstract:

Thesis (Ph.D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Gee-Kung Chang; Committee Co-Chair: Jianjun Yu; Committee Member: John A. Buck; Committee Member: Joy Laskar; Committee Member: Umakishore Ramachandran; Committee Member: Ye Li

APA, Harvard, Vancouver, ISO, and other styles

37

Liu, Cheng. "Advanced system design and signal processing techniques for converged high-speed optical and wireless applications." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49058.

Full text

Abstract:

The ever-increasing data traffic demand drives the evolution of telecommunication networks, including the last-mile access networks as well as the long-haul backbone networks. This Ph.D. dissertation focuses on system design and signal processing techniques for next-generation converged optical-wireless access systems and the high-speed long-haul coherent optical communication systems. The convergence of high-speed millimeter-wave wireless communications and high-capacity fiber-optic backhaul networks provides tremendous potential to meet the capacity requirements of future access networks. In

APA, Harvard, Vancouver, ISO, and other styles

38

Rajbhandari, Sujan. "Application of wavelets and artificial neural network for indoor optical wireless communication systems." Thesis, Northumbria University, 2010. http://nrl.northumbria.ac.uk/1933/.

Full text

Abstract:

This study investigates the use of error control code, discrete wavelet transform (DWT) and artificial neural network (ANN) to improve the link performance of an indoor optical wireless communication in a physical channel. The key constraints that barricade the realization of unlimited bandwidth in optical wavelengths are the eye-safety issue, the ambient light interference and the multipath induced intersymbol interference (ISI). Eye-safety limits the maximum average transmitted optical power. The rational solution is to use power efficient modulation techniques. Further reduction in transmit

APA, Harvard, Vancouver, ISO, and other styles

39

Dey, Sanjoy Namuduri Kameswara. "Performance analysis of CCR based distributed sensor network based on optical wireless communication." A link to full text of this thesis in SOAR, 2008. http://hdl.handle.net/10057/2007.

Full text

Abstract:

Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical and Computer Engineering.<br>Copyright 2008 by Sanjoy Dey. All Rights Reserved. Includes bibliographical references (leaves 16-18).

APA, Harvard, Vancouver, ISO, and other styles

40

Hagem, Rabee Mouffage. "Real Time Evaluation of Swimmers Performance Based on an Optical Wireless Communication System." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/365345.

Full text

Abstract:

Athlete monitoring using movement sensors can provide important information for coaches and trainers. The main aim of this thesis is to design, implement and test an optical wireless communication link for swimming applications to give real time feedback to the swimmer so that adjustments can be made during swimming. As swimmers are located relatively close to the surface of the water, arm and leg movement can generate a significant number of air bubbles. Total internal reflection from the surface and attenuation due to bubbles is a major problem for communications both below and above the wat

APA, Harvard, Vancouver, ISO, and other styles

41

Li, Yichen. "Enhancing communication link performance in visible light communication." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25666.

Full text

Abstract:

With data throughput increasing exponentially in wireless communication networks, the limited radio frequency (RF) spectrum is unable to meet the future data rate demand. As a promising complementary approach, optical wireless communication (OWC) has gained significant attention since its licence-free light spectrum provides a considerable amount of communication bandwidth. In conventional OWC systems, the information-carried signal has to be real-valued and non-negative due to the incoherent light output of the conventional optical transmitter, light emitting diode (LED). Therefore, an intens

APA, Harvard, Vancouver, ISO, and other styles

42

Dimitrov, Svilen Dimitrov. "Analysis of OFDM-based intensity modulation techniques for optical wireless communications." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7833.

Full text

Abstract:

Optical wireless communication (OWC) is a promising alternative to radio frequency (RF) communication with a significantly larger and unregulated spectrum. Impairments in the physical layer, such as the non-linear transfer characteristic of the transmitter, the dispersive optical wireless channel and the additive white Gaussian noise (AWGN) at the receiver, reduce the capacity of the OWC system. Single-carrier multi-level pulse position modulation (M-PPM) and multilevel pulse amplitude modulation (M-PAM) suffer from inter-symbol interference (ISI) in the dispersive channel which reduces their

APA, Harvard, Vancouver, ISO, and other styles

43

Kraemer, Rafael Magalhães Gomes. "Underwater optical wireless communications." Master's thesis, 2019. https://hdl.handle.net/10216/119069.

Full text

Abstract:

Underwater optical wireless communications (UOWC) is an exciting new field that has grasped attention from several research groups worldwide .This this aimed to conduct a profound study of thew most relevant aspects of a UOWC system. A complete simulation framework for various underwater conditions was developed, a study of different modulation formats for free space optical communications was conducted and a functional prototype using state of the art optical components was developed.

APA, Harvard, Vancouver, ISO, and other styles

44

Sun, Xiaobin. "Ultraviolet Band Based Underwater Wireless Optical Communication." Diss., 2020. http://hdl.handle.net/10754/662706.

Full text

Abstract:

Underwater wireless optical communication (UWOC) has attracted increasing interest for data transfer in various underwater activities. However, the complexity of the water environment poses considerable challenges to establish aligned and reliable UWOC links. Therefore, solutions that are capable of relieving the requirements on positioning, acquisition and tracking (PAT) are highly demanded. Different from the conventional blue-green light band utilized in UWOC, ultraviolet (UV) light is featured with low solar background noise, non-line-of-sight (NLOS) and good secrecy. The proposed work is

APA, Harvard, Vancouver, ISO, and other styles

45

Guo, Yujian. "Underwater wireless optical communication system under reciprocal turbulence." Thesis, 2018. http://hdl.handle.net/10754/629861.

Full text

Abstract:

Underwater communication systems are in high demanded for subaquatic environment activities as the sea is an enormous and mostly unexplored place. The ten-meter long and few giga-bit per second range optical communication technique is feasible and has bright future compared to the mature but low data rate (few kilobits per second) acoustic technology and short distance (several meters) radio-frequency signaling schemes. The underwater wireless optical communication (UWOC) technique takes advantage of wide bandwidth, low attenuation effect in the visible range for multiple applications such as

APA, Harvard, Vancouver, ISO, and other styles

46

Chi, Jing-Kai, and 嵇經凱. "A 5 m/25 Gbps Underwater Wireless Optical Communication System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/zg5d24.

Full text

Abstract:

碩士<br>國立臺北科技大學<br>光電工程系<br>106<br>Underwater wireless optical communication (UWOC) has elicited significant interest over the past few years as a provider of high-speed underwater links. Many applications of UWOC systems have been proposed for environmental monitoring, disaster precaution, and underwater oil pipe investigation. To satisfy the requirements of different applications, a high-speed UWOC system with limited underwater link is needed. In this paper, two-stage injection-locked and laser beam expander techniques had been adopted to improve the transmission performance. Nevertheless, t

APA, Harvard, Vancouver, ISO, and other styles

47

Tang, Tai-Ching, and 唐泰清. "Wireless Communication System for Unmanned Underwater Vehicles using Optical Laser Link." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/64025091827836560977.

Full text

Abstract:

碩士<br>國立臺灣大學<br>工程科學及海洋工程學研究所<br>103<br>An underwater wireless optical communication system that adopts laser and LED as the transmission medium is demonstrated. It serves as a short-distance and full-duplex wireless communication interface between underwater vehicles and humans in a shallow or narrow water environment where acoustic waves show unsatisfied communication performance. This system has two parts: static node and autonomous underwater vehicle node. They all adopt PIN photodiodes as optical receiver. The former uses the high power LED as its transmitter, and the latter was equipped

APA, Harvard, Vancouver, ISO, and other styles

48

Oubei, Hassan M. "Underwater Wireless Optical Communications Systems: from System-Level Demonstrations to Channel Modeling." Diss., 2018. http://hdl.handle.net/10754/628028.

Full text

Abstract:

Approximately, two-thirds of earth's surface is covered by water. There is a growing interest from the military and commercial communities in having, an efficient, secure and high bandwidth underwater wireless communication (UWC) system for tactical underwater applications such as oceanography studies and offshore oil exploration. The existing acoustic and radio frequency (RF) technologies are severely limited in bandwidth because of the strong frequency dependent attenuation of sound in seawater and the high conductivity of seawater at radio frequencies, respectively. Recently, underwater wir

APA, Harvard, Vancouver, ISO, and other styles

49

Al-Halafi, Abdullah. "Real-Time and Ultra-High Definition Video Transmission in Underwater Wireless Optical Networks." Diss., 2018. http://hdl.handle.net/10754/628065.

Full text

Abstract:

Oceans form about three quarters of our planet Earth, and house immense resources that are critical for future generations. Exploring and monitoring such resources is becoming essential to protect the effected ones by the irresponsible human behavior, and to discover new ones. The limitations of depths mandate the search for alternatives and where human divers become endangered. Using remotely operated vehicles is commonly used for marine explorations, while tethered to ships. To be fully autonomous and to avoid damaging the fragile marine environment, they must be equipped with wireless commu

APA, Harvard, Vancouver, ISO, and other styles

50

Alkhazragi, Omar. "Wavelength Dependence of Underwater Turbulence Characterized Using Laser-Based White Light." Thesis, 2019. http://hdl.handle.net/10754/631898.

Full text

Abstract:

The means of communication in oceanic environments is currently dominated by sonar. Although it is reliable for long-distance transmission, the vision of internet of underwater things (IoUT) requires an alternate means for high-data-rate transmission. It is also envisaged that a networked underwater and above-water objects, such as sensor nodes, and autonomous underwater vehicles will benefit seafloor exploration. The use of laser-based optical communication is poised to realize this dream while working hand-in-hand with acoustic and radio-frequency technologies from the littoral zone to deep

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!