Unlocking Spectral Efficiency in Intensity Modulation and Direct Detection Systems Article Swipe

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Dobroslav Tsonev , Stefan Videv , Harald Haas ·

YOU? · · 2015 · Open Access · · DOI: https://doi.org/10.1109/jsac.2015.2432530

A number of inherently unipolar orthogonal frequency division multiplexing (OFDM) modulation schemes have been introduced recently in an attempt to improve the energy efficiency of OFDM-based intensity modulation and direct detection (IM/DD) systems. All such algorithms, including asymmetrically clipped optical OFDM (ACO-OFDM), pulse-amplitude-modulated discrete multitone modulation (PAM-DMT) and unipolar orthogonal frequency division multiplexing (U-OFDM), experience an inherent loss in spectral efficiency caused by the restrictions imposed on the OFDM frame structure required for the generation of a unipolar signal. The current paper presents a modified modulation approach, termed enhanced U-OFDM (eU-OFDM), which compensates the spectral efficiency loss in U-OFDM. At the same time, it still allows for the generation of an inherently unipolar modulation signal that achieves better performance in terms of both electrical power and optical power dissipation compared to the conventional state-of-the-art technique direct current (DC)-biased optical OFDM (DCO-OFDM). To the best of the authors' knowledge, the current work also presents the first experimental proof-of-concept demonstration of both U-OFDM and eU-OFDM, and clearly demonstrates the significant energy advantages that these two schemes can introduce in an optical wireless communications (OWC) system.

Related Topics

Orthogonal Frequency-Division Multiplexing

Modulation (Music)

Computer Science

Electronic Engineering

Multiplexing

Frequency-Division Multiplexing

Concepts

Orthogonal frequency-division multiplexing Modulation (music) Computer science Intensity modulation Spectral efficiency Electronic engineering Multiplexing Frequency-division multiplexing Optical wireless Telecommunications Wireless Channel (broadcasting) Phase modulation Physics Engineering Acoustics Phase noise

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Type: article
Language: en
Landing Page: https://doi.org/10.1109/jsac.2015.2432530
PDF: https://ieeexplore.ieee.org/ielx7/49/7206775/07106494.pdf
OA Status: hybrid
Cited By: 152
References: 45
Related Works: 10
OpenAlex ID: https://openalex.org/W1556721971

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DOI: https://doi.org/10.1109/jsac.2015.2432530

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Title: Unlocking Spectral Efficiency in Intensity Modulation and Direct Detection Systems

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Language: en

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Publication year: 2015

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Publication date: 2015-05-13

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Authors: Dobroslav Tsonev, Stefan Videv, Harald Haas

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Landing page: https://doi.org/10.1109/jsac.2015.2432530

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Concepts: Orthogonal frequency-division multiplexing, Modulation (music), Computer science, Intensity modulation, Spectral efficiency, Electronic engineering, Multiplexing, Frequency-division multiplexing, Optical wireless, Telecommunications, Wireless, Channel (broadcasting), Phase modulation, Physics, Engineering, Acoustics, Phase noise

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Cited by: 152

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