A Simple OFDM Scheme for VLC Systems Based on u-Law Mapping

Yang, Yang; Zeng, Zhimin; Feng, Shulan; Guo, Caili

doi:10.1109/lpt.2015.2503481

Cited by 37 publications

(17 citation statements)

References 14 publications

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“…*** It stands for several essentially equivalent schemes including the spectrally and energy efficient OFDM (SEE-OFDM) [14], [15], the layered ACO-OFDM (LACO-OFDM) [16], and the eACO-OFDM [17]. [28], Asymmetrically reconstructed OOFDM [29] Transmitting polarity information and absolute values of original OFDM signals separately PIC-flip-OFDM [30], AAO-OFDM [31] Combining known unipolar schemes with informative DC bias DCIO-OFDM [32] Combining known unipolar schemes with nonlinear transforms µ-OFDM [33] Switching between known unipolar schemes AAD-OFDM [34] * Note that DC bias is also used in some schemes.…”

Section: Multi-componentmentioning

confidence: 99%

A Comparative Study of Unipolar OFDM Schemes in Gaussian Optical Intensity Channel

Zhou

Zhang

2018

IEEE Trans. Commun.

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We study the information rates of unipolar orthogonal frequency division multiplexing (OFDM) in discrete-time optical intensity channels (OIC) with Gaussian noise under average optical power constraint. Several single-, double-, and multicomponent unipolar OFDM schemes are considered under the assumption that independent and identically distributed (i.i.d.) Gaussian or complex Gaussian codebook ensemble and nearest neighbor decoding (minimum Euclidean distance decoding) are used. We obtain an array of information rate result. These results validate existing signal-to-noise-and-distortion-ratio (SNDR) based rate analysis, establish the equivalence of information rates of certain schemes, and demonstrate the evident benefits of using component-multiplexing at high signal-to-noise-ratio (SNR). For double-and multi-component schemes, the component power allocation strategies that maximize the information rates are investigated. In particular, by utilizing a power allocation strategy, we prove that several multi-component schemes approach the high SNR capacity of the discrete-time Gaussian OIC under average power constraint to within 0.07 bits.Index Terms-Channel capacity, information rate, intensity modulation and direct detection (IM/DD), optical wireless communications (OWC), orthogonal frequency division multiplexing (OFDM).

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Section: Multi-componentmentioning

confidence: 99%

A Comparative Study of Unipolar OFDM Schemes in Gaussian Optical Intensity Channel

Zhou

Zhang

2018

IEEE Trans. Commun.

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“…Using matrix decomposition, (13) can be decomposed into the product of two matrices as P = GT (14) where and T and G are presented, respectively, as…”

Section: Intrinsic Of Precoding Transformmentioning

confidence: 99%

“…The hard clipping method [11][12][13] truncates the peaks of the OFDM signals as the signals exceed the predefined thresholds. The soft companding technique such as Mu-Law companding [14,15], non-linear companding [16], exponential companding [17], and new companding using the airy special function [18] apply a nonlinear transformation to limit high peak value. The selected mapping (SLM) [19,20] and the partial transmit sequence [21][22][23], which comprise the representation of multiple signals, were proposed to obtain low PAPR but both methods employ complex circuits and require transmitting side information to the receiver.…”

Section: Introductionmentioning

confidence: 99%

Generalised precoding method for PAPR reduction with low complexity in OFDM systems

Hsu

Liao

2018

IET Communications

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“…In [13,14], PAPR reduction methods have also been introduced to quadrature amplitude modulation (QAM) OFDM based VLC systems. In the literature, various approaches have been proposed, including clipping [15,16], companding transforms [17][18][19][20][21][22], and precoding schemes [23][24][25][26][27] to reduce the PAPR of OFDM signals. The clipping method introduces both in-band distortion and out-ofband radiation on OFDM signals, and thus results in system performance degradation when the clipping ratio exceeds a certain threshold [28].…”

Section: Introductionmentioning

confidence: 99%

On the study of the relation between linear/nonlinear PAPR reduction and transmission performance for OFDM-based VLC systems

Lu¹,

Hong²,

Chen³

et al. 2018

Opt. Express

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The relation between the peak-to-average-power-ratio (PAPR) reduction schemes and the transmission performance of the orthogonal frequency division multiplexing (OFDM) based visible light communication (VLC) system is experimentally investigated. The linear selective mapping (SLM) scheme and the nonlinear logarithmic companding scheme are optimized by considering both PAPR reduction and bit error rate (BER) performance. It is demonstrated that the logarithmic companding scheme, albeit providing larger PAPR reduction when compared to the SLM scheme, may result in worse BER performance due to the additional noise induced in its expanding process. Both numerical and experimental investigations show that, at the expense of increased complexity and reduced efficiency, the VLC system using the linear SLM scheme exhibits better BER performance compared to the system using the nonlinear logarithmic companding scheme. We show that for a 400-Mb/s transmission at a distance of 1 m, the BER can be reduced from 2.02 × 10 to 2.51 × 10 by using logarithmic companding scheme. By using the linear SLM scheme, the BER can be further reduced to 1.77 × 10.

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A Simple OFDM Scheme for VLC Systems Based on u-Law Mapping

Cited by 37 publications

References 14 publications

A Comparative Study of Unipolar OFDM Schemes in Gaussian Optical Intensity Channel

A Comparative Study of Unipolar OFDM Schemes in Gaussian Optical Intensity Channel

Generalised precoding method for PAPR reduction with low complexity in OFDM systems

On the study of the relation between linear/nonlinear PAPR reduction and transmission performance for OFDM-based VLC systems

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