Low-PAPR Asymmetrically Clipped Optical OFDM for Intensity-Modulation/Direct-Detection Systems

Zhou, Ji; Qiao, Yaojun

doi:10.1109/jphot.2015.2430843

Cited by 44 publications

(29 citation statements)

References 19 publications

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“…In addition, the total average optical power of each OFDM scheme above is set to unit as in [19]. Compared to other optical OFDM schemes, ACO-OFDM has a higher PAPR due to the same peak power but lower average power caused by half of the time-domain signals been clipped at zeros [30]. For AAO-OFDM, the simulation results are aligned with the theoretical analysis as depicted in Fig.…”

Section: B the Papr Of Aao-ofdm Time-domain Signalsmentioning

confidence: 61%

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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Section: B the Papr Of Aao-ofdm Time-domain Signalsmentioning

confidence: 61%

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

Bai

Wang

Hanzo

2017

J. Lightwave Technol.

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“…An "OFDM" has been used in the optical communication systems because of its opposition to Intersymbol Interference (ISI) and high spectral efficiency. "IM/DD OOFDM" system has been extensively explored in long-haul optical Communications systems [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The OOFDM signal involves severally modulated subcarriers that may provide a large PAPR once value-added up coherently. An OOFDM signal features a massive PAPR that is terribly sensitive to the non-linearity of the high peak [3]. Blocks of the symbol in the "OFDM" are selected with every symbol modulating one from a set of subcarriers and these subcarriers are recognized to be orthogonal [11].…”

Section: Introductionmentioning

confidence: 99%

Mitigate PAPR Effect in Optical Orthogonal Frequency Division Multiplexing Using Companding Technique

2018

IJCCCE

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orthogonal frequency division multiplexing (OFDM) is emerging as the leading technology for high data rates. The OFDM based on multicarrier transmission that transforms a wideband channel into a group of thin-band channels. The high peak to average power ratio (PAPR) considers the main drawback factor in this system, so the companding technique modifies the amplitude of OFDM signal to reduce this factor. The proposed A-law companding technique has been implemented in intensity modulation/direct detection optical orthogonal frequency division multiplexing (IM/DDOOFDM). The proposed companding scheme guarantees the improved performance in terms of bit error rate (BER) and quality factor (QF) while reducing PAPR effectively and efficiently by modifying the amplitude of the transmitted signals. Our results confirm that the suggested scheme exhibits a good ability to reduce PAPR and a good BER performance based on the use the A factor. At the complementary cumulative distribution function (CCDF) of 10- 3, the PAPR value of our proposed scheme is about 4.4 dB lower than those of un-companded signal at best control factor used of A at 87.6, accordingly the QF is 2.5 dB and the BER is 6.2×10-3 at a distance 900km without any equalization technique or training sequence or any channel estimation.

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“…Among which, the Intensity Modulation and Direct Detection (IM/DD) optical OFDM system has gained great attention due to the advantages of simple implantation, low cost and unnecessary locally-deployed oscillator laser in the receiver. In IM/DD optical OFDM systems, the Asymmetrically Clipped and Direct Current bias Optical (ACO and DCO) OFDM technologies are utilized to make OFDM signal unipolar [4][5][6]. In this paper, the DHT (IDHT) is employed to replace the Fast Fourier Transform (FFT) (IFFT) in traditional optical OFDM systems.…”

Section: Introductionmentioning

confidence: 99%

DHT-based IM/DD optical OFDM system for power data transmission

Zhao¹,

Li²,

Liang³

et al. 2016

Proceedings of the 6th International Conference on Information Engineering for Mechanics and Materials

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Abstract. For achieve fast and reliable power data transmission, we propose a novel Intensity Modulation and Direct Detection (IM/DD) optical Orthogonal Frequency Division Multiplexing (OFDM) system. In this system, we utilize Discrete Hartley Transform (DHT) instead of Discrete Fourier Transform (DFT) which is used in traditional optical OFDM systems, in order to complete the signal demodulation and modulation procedures, thus leading to the orthogonality of data-carrying subcarriers. Simulation results show that the similar bit error rate performance can be achieved between the DHT-based optical OFDM system (BPSK, 4-Pulse Amplitude Modulation (PAM) and 8-PAM) and the DFT-based optical OFDM system (4-QAM, 16-QAM, 64-QAM).

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Low-PAPR Asymmetrically Clipped Optical OFDM for Intensity-Modulation/Direct-Detection Systems

Cited by 44 publications

References 19 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

Mitigate PAPR Effect in Optical Orthogonal Frequency Division Multiplexing Using Companding Technique

DHT-based IM/DD optical OFDM system for power data transmission

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