Multiple-subcarrier modulation for nondirected wireless infrared communication

Carruthers, Jeffrey B.; Kahn, Joseph M.

doi:10.1109/49.490239

Cited by 303 publications

(155 citation statements)

References 7 publications

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“…Subcarrier L-QAM suffers from an additional power penalty of 1.5 dB, because of the power wasted in the DC offset common to all subcarrier techniques, plus multisubcarrier and multilevel penalties [15]. Thus, compared with OOK, the power requirement to achieve a given bit rate is relatively higher for subcarrier L-QAM.…”

Section: Multilevel Modulationmentioning

confidence: 99%

Recent developments in indoor optical wireless systems

et al. 2008

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Section: Multilevel Modulationmentioning

confidence: 99%

Recent developments in indoor optical wireless systems

et al. 2008

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“…Since intensity modulation with direct detection is utilized in VLC for low-cost implementation, the signals modulated on the light-emitting diodes (LEDs) should be real-valued and nonnegative [2]. Therefore, various optical OFDM schemes have been proposed to satisfy these constraints, namely DC-biased optical OFDM (DCO-OFDM) [3], asymmetrically clipped optical OFDM (ACO-OFDM) [4], pulse-amplitude-modulated discrete multi-tone (PAM-DMT) [5], unipolar OFDM (U-OFDM) [6], and Flip OFDM [7]. In all these optical OFDM schemes, Hermitian symmetry is utilized on the OFDM subcarriers before inverse fast Fourier transform (IFFT), so that the time-domain signals are real-valued.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, special arrangements on the signals in the time or frequency domain are used in Refs. [3][4][5][6][7] without the need of DC bias, which generate non-negative signals at the cost of spectral efficiency loss. In order to overcome the spectral efficiency loss while maintaining high-energy efficiency, several hybrid schemes are proposed [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Index Modulation-Aided OFDM for Visible Light Communications

Wang¹,

Mao²,

Hanzo³

2017

Visible Light Communications

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Index modulation-aided orthogonal frequency-division multiplexing(IM-OFDM) is a promising modulation technique to achieve high spectral and energy efficiency. In this chapter, the conventional optical OFDM schemes are firstly reviewed, followed by the principles of IM-OFDM. The application of IM-OFDM in visible light communication (VLC) systems is introduced, and its performance is compared with conventional optical OFDM, which verifies its superiority. Finally, the challenges and opportunities of IM-OFDM are discussed for the VLC applications.

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“…In IM/DD (Intensity Modulation and Direct Detection) based VLCs, the requirement for the light intensity to be positive and real implies that complex and bipolar signal formats such as the traditional OFDM cannot be used. Thus, DCO-OFDM (DC-biased Optical OFDM) and ACO-OFDM (Asymmetrically Clipped Optical OFDM) were proposed for IM/DD VLC systems [18,19] . Both schemes are constrained to have HS (Hermitian Symmetry) in order to provide real-time domain signals at the cost of 50% of the electrical bandwidth [20] .…”

Section: Introductionmentioning

confidence: 99%

Position encoded asymmetrically clipped optical orthogonal frequency division multiplexing in visible light communications

Saied

Ghassemlooy

Tang

et al. 2017

J. Commun. Inf. Netw.

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A PE-ACO-OFDM (Position-Encoded Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing) signaling scheme for intensity modulation and direct detection is introduced in this paper, where the anti-asymmetry characteristics of ACO-OFDM are exploited to improve the rate of data transmission. This is achieved by reducing the symbol duration of the ACO-OFDM signal, where only the first half of ACO-OFDM is used to transmit the ACO-OFDM data symbol after inverting its negative samples to positive ones. In addition, encoded ACO-OFDM samples are combined with every ACO-OFDM symbol to allow the receiver to identify the position of the inverted samples. Simulation results are introduced, and it is shown that the data rates of PE-ACO-OFDM improve by 33% compared with ACO-OFDM, when a 256-quadrature amplitude modulation scheme is considered as the encoded constellation order. It is also shown that the signal to noise ratio of the proposed PE-ACO-OFDM is higher by almost 1 dB compared with the traditional ACO-OFDM.

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Multiple-subcarrier modulation for nondirected wireless infrared communication

Cited by 303 publications

References 7 publications

Recent developments in indoor optical wireless systems

Recent developments in indoor optical wireless systems

Index Modulation-Aided OFDM for Visible Light Communications

Position encoded asymmetrically clipped optical orthogonal frequency division multiplexing in visible light communications

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