Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Optical wireless"”.
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Optical wireless communications
The phenomenal global demand for wireless communication links with greater bandwidths is motivating engineers world over to come up with alternatives communication links. One of such system that has received a great deal of attention and has shown evidence of a promising future is infrared optical …
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High Capacity VCSEL Array Based Optical Wireless Links
The development of new high-speed wireless data transmission applications, such as high-definition video streaming, virtual reality, and the Internet of Things, increases the future demand for mobile data traffic capacity. However, the limited RF spectrum is not sufficient to meet this demand. …
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Digital pulse interval modulation for indoor optical wireless communication systems
… 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, …
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MIMO MC-CDMA Systems over indoor optical wireless communication channels
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 …
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Heterogeneous integration of optical wireless communications within next generation networks
… traffic growth is expected in future wireless networks and new technologies will be needed to satisfy demand. Optical wireless (OW) communication offers vast unused spectrum and high area spectral efficiency. In this work, optical cells are envisioned as supplementary access points …
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Optical wireless communication systems employing dual header pulse interval modulation (DH-PIM)
<p>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 …
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Single-carrier frequency domain equalization using subband decomposition for optical wireless communications
Optical wireless communication is intended to be applied into indoor and visual distance high-rate data transmission, which is complementary to radio frequency communications. There are specific problems and requirements in optical wireless communications compared with radio frequency …
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Orthogonal space time coding for IM/DD optical wireless communication with single carrier frequency domain equalization
Recently the development of optical wireless communication has received growing attention because of its unlimited bandwidth and simple implementation as compared to radio frequency communication application for indoor wireless data transmission. The objective of this thesis is to improve the …
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System design and performance analysis of asymmetrically and symmetrically clipped optical (ASCO)-OFDM for IM/DD optical wireless communications
… dramatically increase, the demand for high speed wireless service has been growing. Optical wireless communications (OWCs), which offer unlimited transmission bandwidth, have received a lot of attention and been studied in recent decades. They can be an effective alternative to radio frequency …
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Novel smart modules for imaging, communications, and displays
… which smartly adapt to changes in irradiance, optical wireless communication systems which can adapt to the number of users and to changes in link length, and a smart laser projection display that smartly adjust the pixel size to achieve a high resolution projected image at each screen …
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Autonomous receivers for next-generation of high-speed optical communication networks
… optic communications and the convergence of the optical-wireless network will dramatically increase the network heterogeneity and complexity. The goal of our research is to create smart receivers that can autonomously identify and demodulate, without prior knowledge, nearly any signal emerging …
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Study of Optical OFDM System for Wireless LAN Applications
<p>The advantages of optical fiber make it possible to extend the data rate transmission and propagation distance. Orthogonal frequency division multiplexing (OFDM) as a multicarrier technique (MC) is used in hybrid optical-wireless system designs because it has the best spectral efficiency to …
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Técnicas OCDMA con códigos ópticos aleatorios para redes de telecontrol / telemetría en entornos cerrados
… elevado número de usuarios simultáneos. Abstract Optical wireless systems feature interesting characteristics which make them good candidates for communicating in closed environments. Usage of telecontrol/telemetry networks in such environments present particular constraints to allow communication …
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Design of single-carrier frequency domain equalization (SC-FDE) with transmit diversity for wireless and optical communications
As the demand of wireless service is rising, there is a need to transmit high-speed packets over the wireless communication channel. Broadband data transmission over wireless channels commonly faces the challenges of multipath fading channels, which are both time and frequency selective. There is …
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Experimental Investigation Of Ultrawideband Wireless Systems: Waveform Generation, Propagation Estimation, And Dispersion Compensation
… an emerging technology for the future high-speed wireless communication systems. Although this technology offers several unique advantages like robustness to fading, large channel capacity and strong anti-jamming ability, there are a number of practical challenges which are topics of current …
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Multiple-input multiple-output visible light communication receivers for high data-rate mobile applications
… light communication (VLC) is an emerging form of optical wireless communication that transmits data by modulating light in the visible spectrum. To meet the growing demand for wireless communication capacity from mobile devices, we investigate multiple-input multiple-output (MIMO) VLC to achieve …
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Detection Statistics Of Multiple-Pulse Optical Signals Through Atmospheric Turbulence
<p>Statistics are studied for signal detection in optical communication systems operating through the atmosphere. Optical communication systems with which this study is concerned are those that employ intensity modulation and direct detection. Atmospheric turbulence, which is fluctuations in the …
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Next-Generation Space Communications Technologies for Building Future Mars Connectivity
… lander and a rover are re-allocated to compose a wireless local mobile network as the base station (BS) and user equipment (UE), respectively. Next, in order to model realistic Martian channels for further solid evaluations, we present a study on large and small-scale phenomena through a …
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Coexistence of directional and non-directional technologies in 6G wireless dense networks
… networks are characterized by the prevalence of wireless access points (APs) in close proximity to a population of user devices on a similar scale. By increasing AP density, the aggregate data consumption of a system can be dramatically increased. In this dissertation we consider dense deployment …
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Strategies for limiting interference and interception of free space optical communications
Free space optical systems provide an attractive solution to communication needs that require inexpensive, easily deployable links capable of high data rate transmissions. A major challenge of free space optical communication is ensuring the integrity and confidentiality of the transmitted …
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