Improved TKM-TR methods for PAPR reduction of DCO-OFDM visible light communications

Hei, Yongqiang; Liu, Jiao; Gu, Huaxi; Li, Wentao; Xu, Xiaochuan; Chen, Ray T.

doi:10.1364/oe.25.024448

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…Hei et al. [28] proposed a tone reservation method based on time domain kernel matrix (TKM‐TR) techniques, which was investigated and used in the DCO‐OFDM system, in order to reduce PAPR. Despite its excellent complementary cumulative distribution function (CCDF), it has a poor BER performance.…”

Section: Introductionmentioning

confidence: 99%

A new complexity reduction scheme in selective mapping‐based visible light communication direct current‐biased optical orthogonal frequency division multiplexing systems

Gunturu

Valluri

2022

IET Optoelectronics

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Visible light communication (VLC) has emerged as a good accompaniment to radio‐frequency (RF) technologies by deploying multicarrier schemes such as orthogonal frequency division multiplexing (OFDM). However, the coherent summation of carriers in the OFDM system leads to a high peak‐to‐average‐power ratio (PAPR), causing non‐linear clipping distortion at the transmitting light‐emitting diode. This intricacy becomes a potential barrier for intensity modulation and limits the VLC systems' bandwidth. In the literature, non‐distorting PAPR lowering approaches, such as the selective mapping (SLM) approach, have been confirmed as the most effective strategy for reducing ineludible high PAPR in optical OFDM systems among all other available techniques. Besides its astounding performance, the computational complexity also becomes a major complication in SLM due to the generation of multiple candidates. This paper proposes a computational complexity minimisation approach using inherit system properties in the SLM‐based PAPR suppression method for VLC systems, where the phase sequence vectors are considered periodic. The alternative direct current‐biased optical orthogonal frequency division multiplexing candidates for the single frequency‐domain data block are generated with the periodic phase rotation vector. The evaluation of the complexity analysis and the simulation results shows that the mitigation of computational complexity surpasses the standard SLM technique.

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Section: Introductionmentioning

confidence: 99%

A new complexity reduction scheme in selective mapping‐based visible light communication direct current‐biased optical orthogonal frequency division multiplexing systems

Gunturu

Valluri

2022

IET Optoelectronics

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“…However, these methods can reduce the PAPR at the cost of transmission power consumption and computational complexity. Recently, tone reservation (TR)-based PAPR reduction schemes for avoiding transmission power consumption were proposed to DCO-OFDM VLC systems [6], [7]. However, the computational complexity associated with the TR method is high in searching peak-canceling signals.…”

Section: Introductionmentioning

confidence: 99%

PAPR Reduction in DCO-OFDM Visible Light Communication Systems Using Optimized Odd and Even Sequences Combination

2019

IEEE Photonics J.

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This paper proposes a novel peak-to-average power ratio (PAPR) reduction scheme, which has several advantages, such as low-complexity candidate construction and no side information (SI) transmission in direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) visible light communication (VLC) systems. In the proposed scheme, the candidates can be generated by linearly combining time-domain even and odd sequences with cyclic shift and phase rotation. Even and odd sequences are obtained by adopting an inverse fast Fourier transform on the even and odd parts of a Hermitian symmetry encoded signal, respectively. Furthermore, a deterministic and efficient selection method of cyclic shift and phase rotation is derived to improve PAPR reduction performance and ensure that each candidate is unique, so that the receiver can recover the transmitted candidate signal without the use of SI. Simulation results show that the proposed scheme can achieve comparable PAPR reduction performance with the conventional selected mapping (CSLM) scheme with random and chaotic sequences, but at a considerably low computational complexity. Moreover, the proposed blind SI detection scheme provides almost the same bit error rate (BER) performance as that of the CSLM scheme with a perfect SI detection and symmetric selected mapping for a DCO-OFDM VLC system with 1024 subcarriers and 16-QAM. In contrast to other related time-domain sequences that combine methods used for DCO-OFDM systems, the proposed scheme improves BER performance with a slight increase in computational complexity and PAPR.

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“…The study in [13] used a semidefinite relaxation method for tone injection to reduce the PAPR for the DCO-OFDM. The branch and bound method [14] and tone reservation method [15] were also proposed to lower the impact of the high PAPR in VLC systems. Nevertheless, these methods reduce the PAPR at the sacrifice of computational complexity and channel resources.…”

Section: Introductionmentioning

confidence: 99%

The Extended SLM Combined Autoencoder of the PAPR Reduction Scheme in DCO-OFDM Systems

et al. 2019

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End-to-end learning in optical communication systems is a promising technique to solve difficult communication problems, especially for peak to average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. The less complex, highly adaptive hardware and advantages in the analysis of unknown or complex channels make deep learning a valid tool to improve system performance. In this paper, we propose an autoencoder network combined with extended selected mapping methods (ESLM-AE) to reduce the PAPR for the DC-biased optical OFDM system and to minimize the bit error rate (BER). The constellation mapping/de-mapping of the transmitted symbols and the phase factor of each subcarrier are acquired and optimized adaptively by training the autoencoder with a combined loss function. In the loss function, both the PAPR and BER performance are taken into account. The simulation results show that a significant PAPR reduction of more than 10 dB has been achieved by using the ESLM-AE scheme in terms of the complementary cumulative distribution function. Furthermore, the proposed scheme exhibits better BER performance compared to the standard PAPR reduction methods.

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Improved TKM-TR methods for PAPR reduction of DCO-OFDM visible light communications

Cited by 9 publications

References 18 publications

A new complexity reduction scheme in selective mapping‐based visible light communication direct current‐biased optical orthogonal frequency division multiplexing systems

A new complexity reduction scheme in selective mapping‐based visible light communication direct current‐biased optical orthogonal frequency division multiplexing systems

PAPR Reduction in DCO-OFDM Visible Light Communication Systems Using Optimized Odd and Even Sequences Combination

The Extended SLM Combined Autoencoder of the PAPR Reduction Scheme in DCO-OFDM Systems

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