Power and rate optimization for visible light communication system with lighting constraints

Gong, Chen; Li, Shangbin; Gao, Qian; Xu, Zhengyuan

doi:10.1109/icc.2015.7249142

Cited by 26 publications

(41 citation statements)

References 10 publications

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“…After that, a DC bias is added and all the remaining negative peaks are clipped, leading to nonnegative signals {x dco,n }. The DC bias can be set according to (3).…”

Section: Ado-ofdmmentioning

confidence: 99%

“…Intensity-modulated direct-detection (IM/DD) systems are widely employed in optical wireless communication (OWC) [1]- [3], fiber-optic communication [4], amplitude modulated radio frequency (RF) wireless communication [5], and broadband wireline transmission [6]. For a general IM/DD system, the instantaneous output optical power is proportional to the input electrical current and the data information is modulated onto the input current intensity.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetrically Clipped Absolute Value Optical OFDM for Intensity-Modulated Direct-Detection Systems

Bai

Wang

Hanzo

2017

J. Lightwave Technol.

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Abstract-Orthogonal frequency division multiplexing (OFD-M) is attracting increasing attention in optical communication systems thanks to the inherent benefits such as high spectral efficiency and resistance to frequency-selective channels. In this paper, a novel energy and spectrally efficient scheme called asymmetrically clipped absolute value optical OFDM (AAO-OFDM) is proposed for intensity-modulated direct-detection (IM/DD) systems. In AAO-OFDM, absolute value optical OFDM (AVO-OFDM) signals on the even subcarriers and asymmetrically clipped optical OFDM (ACO-OFDM) signals on the odd subcarriers are combined for simultaneous transmission, which employs all the subcarriers requiring no DC biases. For AVO-OFDM scheme, the frequency symbols are firstly modulated on the even subcarriers, which are then fed into an inverse fast Fourier transform block. Afterwards, the absolute values of the bipolar time-domain signals are taken to guarantee nonnegativity, while their signs are mapped to the complex-valued symbols and modulated on the odd subcarriers. Since there remain unused odd subcarriers, other useful symbols can be modulated on them, which leads to the conventional ACO-OFDM scheme. At the receiver, the ACO-OFDM symbols on the odd subcarriers are demodulated firstly, which are reconstructed and removed from the received signals. Afterwards, the remaining signals are utilized to detect the AVO-OFDM symbols with the aid of the demodulated sign symbols on the odd subcarriers. Theoretical analysis and simulation results show that AAO-OFDM has lower peak-to-average power ratio than other optical OFDM schemes, which makes it less sensitive to the nonlinearity of the optical devices. Furthermore, it achieves better bit error rate performance compared to its counterparts for the same spectral efficiency.Index Terms-Intensity modulation with direct detection, orthogonal frequency division multiplexing, energy efficiency, spectral efficiency.

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“…After that, a DC bias is added and all the remaining negative peaks are clipped, leading to nonnegative signals {x dco,n }. The DC bias can be set according to (3).…”

Section: Ado-ofdmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asymmetrically Clipped Absolute Value Optical OFDM for Intensity-Modulated Direct-Detection Systems

Bai

Wang

Hanzo

2017

J. Lightwave Technol.

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“…The work in Ref. [15] analyzes the energy consumption under lighting constraints with RGB LEDs for VLC. However, the color constraint in the chromaticity diagram is regarded as a fixed point.…”

Section: Introductionmentioning

confidence: 99%

Power optimization under brightness and communication requirements for visible light communication based on MacAdam ellipse

Lou

Gong

et al. 2017

J. Commun. Inf. Netw.

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Data transmission with RGB LEDs is attracting significant research interest in VLC (Visible Light Communication). We consider the power optimization under brightness and communication requirements for RGB LEDs, and model the color constraint using the MacAdam ellipse instead of a fixed point in the chromaticity diagram. Then an optimization problem is formulated to determine the transmission power consumption and the corresponding coordinates in the chromaticity diagram. We propose a novel two-step algorithm to solve the optimization problem with lower implementation complexity. Numerical results show that the proposed approach shows the same performance as the optimal solution using a brute-force method, and requires the lower power consumption using MacAdam ellipse instead of merely a fixed point in the chromaticity diagram.

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“…IM/DD systems are utilized widely in OWC (Optical Wireless Communication) [1,2] , fiber-optic communication [3] , amplitude modulated RF (Radio Frequency) wireless communication [4] , and broadband wireline transmission [5] . In IM/DD OWC systems, the transmitted electrical signal is modulated onto the instantaneous power of an optical emitter such as LED (Light-Emitting Diode) or LD (Laser Diode).…”

Section: Introductionmentioning

confidence: 99%

“…In IM/DD OWC systems, the transmitted electrical signal is modulated onto the instantaneous power of an optical emitter such as LED (Light-Emitting Diode) or LD (Laser Diode). Thus the time-domain signals should be real-valued and nonnegative [1,2,6] .…”

Section: Introductionmentioning

confidence: 99%

Enhanced asymmetrically clipped DC biased optical OFDM for intensity-modulated direct-detection systems

Bai

Chen

Mao

et al. 2017

J. Commun. Inf. Netw.

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In this paper, we propose an EADO-OFDM (Enhanced Asymmetrically Clipped DC Biased Optical Orthogonal Frequency Division Multiplexing) method for IM/DD (Intensity-Modulated DirectDetection) optical systems, in which the AV-DCO-OFDM (Absolute Valued DC Biased Optical OFDM) symbols on the even subcarriers and ACO-OFDM (Asymmetrically Clipped Optical OFDM) symbols on the odd subcarriers are combined for simultaneous transmission. Moreover, we discuss the PDF (Probability Density Function) and electrical SNR (Signal to Noise Ratio) of the symbols, which are utilized to estimate the BER (Bit Error Ratio) performance and overall performance of EADO-OFDM. The Monte Carlo simulation results have validated the theoretical analysis and have also confirmed the EADO-OFDM is attractive considering the following benefits. Firstly, EADO-OFDM is more energy efficient compared to the power-efficient DCO-OFDM (DC Biased Optical OFDM), since the required DC bias is smaller when appropriate constellation size combinations are chosen. In addition, EADO-OFDM performs better than the conventional ADO-OFDM (Asymmetrically Clipped DC Biased Optical OFDM), because the absolute value operation causes no clipping distortion.

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Power and rate optimization for visible light communication system with lighting constraints

Cited by 26 publications

References 10 publications

Asymmetrically Clipped Absolute Value Optical OFDM for Intensity-Modulated Direct-Detection Systems

Asymmetrically Clipped Absolute Value Optical OFDM for Intensity-Modulated Direct-Detection Systems

Power optimization under brightness and communication requirements for visible light communication based on MacAdam ellipse

Enhanced asymmetrically clipped DC biased optical OFDM for intensity-modulated direct-detection systems

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