Novel Power Efficient Optical OFDM Based on Hartley Transform for Intensity-Modulated Direct-Detection Systems

Moreolo, Michela Svaluto; Muoz, R.; Junyent, G.

doi:10.1109/jlt.2010.2040580

Cited by 103 publications

(28 citation statements)

References 26 publications

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“…For reducing the computational load, here we only consider a single transform block as indicated in Fig. 3(a), with two encoding vectors, p (1) and p (2) , which have real values belonging to the set {±1}. Since the FHT is used, the HS constraint is not necessary and two encoding vectors can be parallel processed with a single FHT, if they are combined to be orthogonal as shown in Fig.…”

Section: Low Complexity Selective Mappingmentioning

confidence: 99%

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Clipping and quantization noise mitigation in intensity-modulated direct detection O-OFDM systems based on the FHT

Nadal¹,

Moreolo²,

Fàbrega

et al. 2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

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In this paper, we propose a cost effective solution based on low complexity selective mapping (LC-SLM) peak to average power ratio (PAPR) reduction scheme to mitigate the clipping and quantization noise in intensitymodulated direct detection (IM/DD) optical orthogonal frequency division multiplexing (O-OFDM) systems. We analyze the sensitivity performance of the proposed system for different modulation formats and varying the bit resolution of the digital-to-analog converter (DAC). Finally, we present the bit error rate (BER) performance for different clipping levels applying and without applying LC-SLM.

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Section: Low Complexity Selective Mappingmentioning

confidence: 99%

“…Optical orthogonal frequency division multiplexing (O-OFDM) systems based on the fast Hartley transform (FHT) have been recently proposed in [1]. The FHT is presented as an alternative transform to the fast Fourier transform (FFT) to generate the OFDM symbols.…”

Section: Introductionmentioning

confidence: 99%

Clipping and quantization noise mitigation in intensity-modulated direct detection O-OFDM systems based on the FHT

Nadal¹,

Moreolo²,

Fàbrega

et al. 2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, when we have a BPS throughput of η ≥ 4, weight optimisation is required. Finally, we impose no positive peak-clipping for ACO-OFDM and DCO-OFDM so as to compare our system to the benchmarkers characterized in [12], [15], [32]. Note that the clipping noise imposed by positive peak-clipping should be considered, when designing a practical system.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…When higherorder Phase Shift Keying (PSK) / Quadrature Amplitude Modulation (QAM) are considered, in [14], adaptive modulation was applied. In addition to conventional Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT)-based OOFDM, Discrete Hartley Transform (DHT) was investigated in [15].…”

mentioning

confidence: 99%

Multi-layer Modulation for Intensity-Modulated Direct-Detection Optical OFDM

Zhang

Hanzo

2013

J. Opt. Commun. Netw.

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Abstract-A Multi-Layer Modulation (MLM) aidedIntensity-Modulated Direct-Detection (IM/DD) DCBiased Optical OFDM (DCO-OFDM) and Asymmetrically Clipped Optical OFDM (ACO-OFDM) are considered. More explicitly, we propose a Double Turbo Receiver (DTR) for jointly detecting the MLM and for compensating the clipping distortion. Additionally, a Genetic Algorithm (GA) aided weight optimisation is pursued for seeking an increased MLM Bits Per Symbol (BPS) throughput. Our numerical results demonstrate that for ACO-OFDM, at the throughput of η = 3 BPS, a 3dB gain was attained for Q = 15 DTR iterations without requiring weight optimisation. For DCO-OFDM, an even more significant gain of 12dB and 8dB was observed at the throughput of η = 3 BPS and η = 4 BPS, respectively without any clipping distortion compensation.

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“…IM/DD are widely used in many low-complexity, cost-effective optical communications links such as short-haul fiber optics [9,10], indoor visible light communications (VLC) [11][12][13][14][15], in-house infrared data transmissions [16][17][18][19], free-space optical (FSO) communications [20][21][22], and even long-distance fiber optical links combined with orthogonal frequency-division multiplexing technique (OFDM) [23,24].…”

Section: Introductionmentioning

confidence: 99%

Bandlimited Optical Intensity Modulation Under Average and Peak Power Constraints

Zhang

Hranilovic

2016

IEEE Trans. Commun.

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Bandlimited optical intensity channels, arising in applications such as indoor infrared communications and visible light communications (VLC), require that all signals satisfy a bandwidth constraint as well as average, peak and non-negative amplitude constraints. However, the signaling designed for conventional radio frequency (RF) electrical channels cannot be applied directly, since they take energy constraints into consideration instead of amplitude constraints. In addition, conventional transmission techniques optimized for broad-band optical channels such as fiber optics, terrestrial/satellite-to-satellite free-space optical (FSO) communications are typically not bandwidth efficient.In this thesis, a two-dimensional signal space for bandlimited optical intensity channels is presented. A novel feature of this model is that the non-negativity and peak amplitude constraints are relaxed. The signal space parameterizes the likelihood of a negative or peak amplitude excursions in the output. Although the intensity channel only supports non-negative amplitudes, the impact of clipping on system performance is shown to be negligible if the likelihood of negative amplitude excursion is small enough. For a given signal space, a tractable approximation approach using a finite series is applied to accurately compute the likelihood of clipping under average and peak optical power constraints. The uncoded asymptotic optical power and iv spectral efficiencies using two-dimensional lattice constellations are computed. The Monte-Carlo (MC) simulation results show that for a given average or peak optical power, schemes designed in the presented signal space haver higher spectral efficiency than M -ary pulse amplitude modulation (PAM) using previously established tech- g 1 (t) first branch receive filterg 2 (t) second branch receive filterh(t) channel response I(t) instantaneous optical intensity n(t) channel noise n 1,i output sample noise after filter g 1 (t) at i-th symbol interval n 2,i output sample noise after filter g 2 (t) at i-th symbol interval n c,1,i clipping distortion after filter g 1 (t) at i-th symbol interval n c,2,i clipping distortion after filter g 2 (t) at i-th symbol interval q variable defined as the ratio of t to symbol period T Q(·) tail probability of the standard normal distribution R residual sum r 1 (t) output waveform of filter g 1 (t)

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Novel Power Efficient Optical OFDM Based on Hartley Transform for Intensity-Modulated Direct-Detection Systems

Cited by 103 publications

References 26 publications

Clipping and quantization noise mitigation in intensity-modulated direct detection O-OFDM systems based on the FHT

Clipping and quantization noise mitigation in intensity-modulated direct detection O-OFDM systems based on the FHT

Multi-layer Modulation for Intensity-Modulated Direct-Detection Optical OFDM

Bandlimited Optical Intensity Modulation Under Average and Peak Power Constraints

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