Power efficient optical OFDM

Armstrong, Jean; Lowery, Arthur J.

doi:10.1049/el:20063636

Cited by 758 publications

(439 citation statements)

References 3 publications

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“…We displace the OFDM sidebands from the optical carrier by modulating them onto a 7.5-GHz RF subcarrier to give an RF sideband from 5 to 10 GHz so that practical optical filters can be used for carrier and sideband suppression. Unlike our previous optical-OFDM designs [24], [25], the modulator drive and bias is adjusted to minimize the positive and negative clipping of the OFDM waveform (see left inset) by the modulator.…”

Section: A Electrical Ofdm Transmittermentioning

confidence: 99%

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Performance of Optical OFDM in Ultralong-Haul WDM Lightwave Systems

Lowery

Armstrong

2007

J. Lightwave Technol.

247

101

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Abstract-We show, using simulations, that a combination of orthogonal frequency division multiplexing (OFDM) and optical single sideband modulation can be used to compensate for chromatic dispersion in ultralong-haul wavelength-division multiplexed (WDM) systems. OFDM provides a high spectral efficiency, does not require a reverse feedback path for compensation, and has a better sensitivity than nonreturn to zero. This paper provides design rules for 800-4000-km optical-OFDM systems. The effects of WDM channel number and spacing, fiber dispersion, and input power per channel on the received Q are studied using extensive numerical simulations. These effects are summarized as a set of design rules.Index Terms-Compensation, fiber dispersion, fiber nonlinearity, four-wave mixing (FWM), long haul, optical single sideband modulation (OSSB), orthogonal frequency division multiplexing (OFDM).

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Section: A Electrical Ofdm Transmittermentioning

confidence: 99%

“…Optical-OFDM system block diagram, including modulator drive waveform, optical spectrum after filter, and RF spectrum after the photoreceiver. [24], [25] to overcome this limitation, giving optical OFDM a 1.8-dB sensitivity advantage over nonreturn to zero (NRZ) for links dominated by a thermal receiver noise.…”

mentioning

confidence: 99%

Performance of Optical OFDM in Ultralong-Haul WDM Lightwave Systems

Lowery

Armstrong

2007

J. Lightwave Technol.

247

101

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“…In ACO-OFDM and PAM-DMT, only the odd subcarriers or the imaginary part of the subcarriers are modulated so that the time-domain signal follows a half-wave symmetry [5], [6]. Therefore, the bipolar OFDM signals could be directly clipped at zero without any information loss.…”

Section: Ofdm-based Vlc Systemmentioning

confidence: 99%

Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control

Wang

Hanzo

Dai

2015

IEEE Photon. Technol. Lett.

109

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Abstract-This letter proposes an asymmetrical hybrid optical orthogonal frequency division multiplexing (AHO-OFDM) scheme for dimmable visible light communication systems. In the proposed scheme, either asymmetrically clipped optical OFDM (ACO-OFDM) or pulse-amplitude-modulated discrete multitone (PAM-DMT) signal is inverted and then both the signals are combined for transmission, where pulsewidth modulation is no longer required for dimming control. The power of ACO-OFDM and PAM-DMT signals is adjusted so that the amplitude of the combined AHO-OFDM signal is asymmetrical, which could utilize all the available subcarriers as well as the entire dynamic range of light-emitting diodes with various dimming levels. Simulation results show that the proposed scheme could achieve a wide dimming range with a small throughput fluctuation.Index Terms-Orthogonal frequency division multiplexing (OFDM), visible light communication (VLC), dimming control, light emitting diode (LED).

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“…In order to resist time dispersion and guarantee the real-valued and non-negative constraint in VLC channel, DC-biased optical orthogonal frequency-division multiplexing (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM) techniques have been utilized in VLC systems [2]. Unlike DCO-OFDM which requires high DC bias [3], ACO-OFDM enjoys an advantage of high power efficiency and wide light emitting diodes (LED) dynamic region.…”

Section: Dear Editormentioning

confidence: 99%

Modified PTS-based PAPR reduction for ACO-OFDM in visible light communications

Tan

Wang

2015

Sci. China Inf. Sci.

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CitationTan J D, Wang Q, Wang Z C. Modified PTS-based PAPR reduction for ACO-OFDM in visible light communications. Sci China Inf Sci, 2015, : xxxxxx(3), doi: xxxxxxxxxxxxxx Dear editor,Visible light communication (VLC) has raised great interests since it supplements the unlicensed spectrum resource for ultra-high data rate transmission [1]. In order to resist time dispersion and guarantee the real-valued and non-negative constraint in VLC channel, DC-biased optical orthogonal frequency-division multiplexing (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM) techniques have been utilized in VLC systems [2]. Unlike DCO-OFDM which requires high DC bias [3], ACO-OFDM enjoys an advantage of high power efficiency and wide light emitting diodes (LED) dynamic region.The inherent peak-to-average power ratio (PAPR) issue of VLC OFDM leads to severe LED nonlinear distortion, which deteriorates the bit error rate (BER) performance [1]. Several methods reported in [4][5][6][7] have been investigated to reduce PAPR and mitigate LED nonlinear distortion of OFDM-based VLC systems. However, the costs such as data rate and performance loss induced by the above algorithms could not be neglected.As an effective method for PAPR reduction, partial transmit sequence (PTS) technique has an advantage of negligible performance degradation and no power increase. However, side information is required at the receiver, which results in data throughput loss [8]. In this letter, we propose a modified PTS-based PAPR reduction scheme for ACO-OFDM in VLC systems by exploiting the unoccupied subcarriers to transmit side information. A novel transmitter is presented to apply the PTS technique in ACO-OFDM VLC system without data throughput loss and an original power allocation method is also proposed to mitigate the power efficiency loss induced by the side information signals. Simulation results demonstrate that the proposed scheme achieves a significant PAPR reduction performance without data throughput loss as well as an improved BER performance when LED nonlinearity exists.Methodology. At the transmitter, the quadrature amplitude modulation (QAM) symbols X ACO of N -point ACO-OFDM block is divided into V disjoint clusters { X

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Power efficient optical OFDM

Cited by 758 publications

References 3 publications

Performance of Optical OFDM in Ultralong-Haul WDM Lightwave Systems

Performance of Optical OFDM in Ultralong-Haul WDM Lightwave Systems

Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control

Modified PTS-based PAPR reduction for ACO-OFDM in visible light communications

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