Information Rate of OFDM-Based Optical Wireless Communication Systems With Nonlinear Distortion

Dimitrov, Svilen; Haas, Harald

doi:10.1109/jlt.2012.2236642

Cited by 233 publications

(133 citation statements)

References 30 publications

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“…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].…”

Section: Dear Editormentioning

confidence: 99%

“…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.…”

Section: Dear Editormentioning

confidence: 99%

“…64QAM was adopted with the power allocation η = 7.1dB calculated from (2) in the proposed ACO-OFDM. AWGN channel was assumed and the LED nonlinear transfer characteristic model given in [1] was applied. The data throughputs of the conventional and the proposed PTS-based ACO-OFDM schemes are both 300 Mbps.…”

Section: Dear Editormentioning

confidence: 99%

“…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.…”

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confidence: 99%

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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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Section: Dear Editormentioning

confidence: 99%

Section: Dear Editormentioning

confidence: 99%

Section: Dear Editormentioning

confidence: 99%

mentioning

confidence: 99%

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

Tan

Wang

2015

Sci. China Inf. Sci.

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“…However, the capacity of the optical wireless channel is still an open issue. Although most literatures relevant to the channel capacity for VLC systems use the classic Shannon channel capacity formula [4], [5], it is not suitable for actual optical wireless channel due to the following reasons:…”

Section: Introductionmentioning

confidence: 99%

A Tight Upper Bound on Channel Capacity for Visible Light Communications

et al. 2016

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Abstract-Since the optical wireless channel in visible light communication (VLC) systems is subject to the nonnegativity of the signal and the average optical power, the classic Shannon channel capacity formula is not applicable to VLC systems. To derive a simple closed-form upper bound on channel capacity, sphere packing argument method has been applied previously. However, there is an obvious gap between the existing spherepacking upper bounds and the lower bounds at high optical signal-to-noise-ratios (OSNRs), which is mainly caused by the inaccurate mathematical approximation of the intrinsic volumes of the simplex. In this letter, a tight sphere-packing upper bound is derived with a new approximation method. Numerical results demonstrate that compared to the existing sphere-packing upper bounds, our proposed upper bound is tighter at high OSNRs.

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Multicarrier Modulation

2017

Visible Light Communications

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Information Rate of OFDM-Based Optical Wireless Communication Systems With Nonlinear Distortion

Cited by 233 publications

References 30 publications

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

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

A Tight Upper Bound on Channel Capacity for Visible Light Communications

Multicarrier Modulation

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