Adaptive Optical Wireless OFDM System with Controlled Asymmetric Clipping

Grubor, J.; Jungnickel, Volker; Langer, Klaus-Dieter

doi:10.1109/acssc.2007.4487566

Cited by 12 publications

(2 citation statements)

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“…Because of the great success of OFDM in wireless and broadband access networks, it is being adopted as an optical [10] [11], multimode fiber (MMF) [15] [16], plastic optical fiber (POF) [17], OFDM-PON (Passive Optical Network) [18], and optical wireless communication systems (OWC) [19] [20]. In this paper, we mainly consider the single-mode fiber OFDM systems, to address the core optical network architecture discussed later in Section IV.…”

Section: Optical Ofdm Transmission Technologymentioning

confidence: 99%

A Survey on OFDM-Based Elastic Core Optical Networking

Zhang

Leenheer

Morea³

et al. 2013

IEEE Commun. Surv. Tutorials

347

134

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Abstract-Orthogonalfrequency-division multiplexing (OFDM) is a modulation technology that has been widely adopted in many new and emerging broadband wireless and wireline communication systems. Due to its capability to transmit a high-speed data stream using multiple spectral-overlapped lower-speed subcarriers, OFDM technology offers superior advantages of high spectrum efficiency, robustness against inter-carrier and inter-symbol interference, adaptability to server channel conditions, etc. In recent years, there have been intensive studies on optical OFDM (O-OFDM) transmission technologies, and it is considered a promising technology for future ultra-high-speed optical transmission. Based on O-OFDM technology, a novel elastic optical network architecture with immense flexibility and scalability in spectrum allocation and data rate accommodation could be built to support diverse services and the rapid growth of Internet traffic in the future. In this paper, we present a comprehensive survey on OFDM-based elastic optical network technologies, including basic principles of OFDM, O-OFDM technologies, the architectures of OFDMbased elastic core optical networks, and related key enabling technologies. The main advantages and issues of OFDM-based elastic core optical networks that are under research are also discussed.

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Section: Optical Ofdm Transmission Technologymentioning

confidence: 99%

A Survey on OFDM-Based Elastic Core Optical Networking

Zhang

Leenheer

Morea³

et al. 2013

IEEE Commun. Surv. Tutorials

347

134

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“…Χρησιµοποιώντας την (5.5), η (5.7) µπορεί να γραφεί ως: συσχετίζει το πλάτος E R0 του ηλεκτρικού πεδίου του ληφθέντος σήµατος µε την εκπεµπόµενη οπτική ισχύ P T .Το IR LOS κανάλι θεωρείται µη επιλεκτικό µε τη συχνότητα (flat)[125] εποµένως το συνολικό ηλεκτρικό πεδίο στην είσοδο του δέκτη θα δίνεται από: όπου d η απόσταση µεταξύ ποµπού και δέκτη, όπως απεικονίζεται στο Σχήµα 41, E n (t) το ηλεκτρικό πεδίο που αντιστοιχεί στο θόρυβο που προέρχεται από το περιβαλλοντικό φως και ο κυµατικός αριθµός k=2πf 0 /c. Στην (5.9) µε p(t) και T s συµβολίζονται ο PSK παλµός και η διάρκεια ενός PSK συµβόλου αντίστοιχα.…”

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Μελέτη Ασύρματων Οπτικών Συστημάτων Για Την Υλοποίηση Ευρυζωνικών Δικτύων Εσωτερικού Χώρου

Ντόγαρη¹

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Το πρώτο οπτικό σύστηµα για ασύρµατη επικοινωνία είναι το φωτόφωνο που κατασκευάστηκε το 1880 από τους Alexander G. Bell και Charles S. Tainter και χρησιµοποιούσε το φως του ήλιου για τη µετάδοση της φωνής. Η περιορισµένη εµβέλεια, η ανάγκη οπτικής επαφής µεταξύ ποµπού και δέκτη καθώς και η απόσβεση του φωτός κατά τη διάδοσή του στην ατµόσφαιρα λόγω των καιρικών φαινοµένων (βροχή, οµίχλη, κτλ.) δεν ευνόησαν την περαιτέρω ανάπτυξη του συστήµατος αυτού. Η εξέλιξη της τεχνολογίας των ηµιαγωγών στα µέσα του 20 ου αιώνα οδήγησε στην κατασκευή αποδοτικών οπτικών πηγών, όπως τα LASER (Light Amplification by Stimulated Emissions of Radiation) και οι δίοδοι εκποµπής φωτός (LED -Light Emitting Diodes), και ανανέωσε το ενδιαφέρον για τα ασύρµατα οπτικά συστήµατα. Οι πηγές αυτές παρείχαν υψηλή οπτική ισχύ καθώς και τη δυνατότητα διαµόρφωσης σε υψηλές συχνότητες. Το 1979, οι Gfeller και Bapst πρότειναν ένα σύστηµα που χρησιµοποιεί υπέρυθρες LEDs για τη µετάδοση δεδοµένων σε ένα τοπικό δίκτυο υπολογιστών. Έκτοτε τα ασύρµατα οπτικά συστήµατα αποτελούν αντικείµενο συνεχούς επιστηµονικής έρευνας και τα τελευταία χρόνια έχουν γίνει διαθέσιµα και εµπορικά.

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DMT modulation for VLC

Langer¹

2015

Visible Light Communication

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Introduction Optical free space communication using visible radiation, i.e. light, has been known for a very long time. Some early examples are signaling using fire, the Heliograph using sunlight, which is directed to the receiver by means of a mirror, or the Photophone invented by Graham Bell (1880). Due to the outstanding success of radio technologies and due to their intrinsic benefits, up to now optical free space communication has remained a niche technology. One of such niche applications took advantage of the immunity from interception, namely the so-called directed transmission for military aims during World War 2 and later on. Different approaches such as optical wireless communication (OWC) using fluorescent tubes are also well recorded in the patent literature but have never achieved a breakthrough. A revival of this way of wireless communication has come about with the advent of visible light LEDs of increasingly high optical power. While their application i nitially was limited to signaling (e.g. telltale or warning light), at the turn of the millennium it became apparent that in future lighting would be dominated by LEDs. Henceforth, there has been growing interest in applications using LED-based OWC, or which combine the functions of lighting and optical wireless data transmission. At the same time, the common term Visible Light Communications (VLC) was coined for this kind of communication. The major reasons for the steadily rising interest in VLC are the lifetime and improved optical power of white light LEDs particularly, and their progressive adoption, as well as the simplicity of LED modulation via their driving current at a modulation bandwidth in the lower MHz range, see e.g. [1â3]. Moreover, the proliferation of mobile applications using radio frequencies has accentuated concerns about the adequate availability of radio-frequency bands and the limits of transmission capacity in current wireless networks, as well as the related data security

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Adaptive Optical Wireless OFDM System with Controlled Asymmetric Clipping

Cited by 12 publications

References 35 publications

A Survey on OFDM-Based Elastic Core Optical Networking

A Survey on OFDM-Based Elastic Core Optical Networking

Μελέτη Ασύρματων Οπτικών Συστημάτων Για Την Υλοποίηση Ευρυζωνικών Δικτύων Εσωτερικού Χώρου

DMT modulation for VLC

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