A Joint Linearization/Companding Approach for Improving a CO-OFDM Transmitter

Bejan, S.; Azou, Stéphane; Morel, Pascal; Diouf, Cherif; Telescu, Mihai; Tanguy, Noël; Sharaiha, Ammar

doi:10.1109/lpt.2015.2455674

Cited by 9 publications

(15 citation statements)

References 16 publications

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“…It is also proposed to apply clipping along with digital predistortion to mitigate performance degradation. Some of the present authors have investigated similar problems by considering nonlinear effects originating from optical components, with a special focus on Semiconductor Optical Amplif ers (SOAs) [8] [9]. Interesting features such as low cost, large optical bandwidth and small form factor [10] make SOAs an interesting alternative to the high-end EDFAs for some application scenarios [11].…”

Section: Introductionmentioning

confidence: 99%

“…In [33], it is proposed to combine the advantages of MP and Envelope Memory Polynomial (EMP) in a hybrid parallel structure whereas in [32] the authors study a Hammerstein model, which is composed of a memoryless nonlinearity function followed by a FIR filter. In our previous study [9], we investigated a Filter LUT scheme, which belongs to the augmented Hammerstein family, but with no special attempt to lower the complexity. The present paper tackles this issue which is crucial at optical data rates.…”

Section: Introductionmentioning

confidence: 99%

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Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system

Diouf

Younes

Noaja

et al. 2017

Optics Communications

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analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system. Optics Communications, Elsevier, 2017, 402, pp.442 -452. 10.1016/j.optcom.2017 The linearization performance of various digital baseband pre-distortion schemes is evaluated in this paper for a coherent optical OFDM (CO-OFDM) transmitter employing a semiconductor optical amplif er (SOA). In particular, the benef ts of using a parallel two-box (PTB) behavioral model, combining a static nonlinear function with a memory polynomial (MP) model, is investigated for mitigating the system nonlinearities and compared to the memoryless and MP models. Moreover, the robustness of the predistorters under different operating conditions and system uncertainties is assessed based on a precise SOA physical model. The PTB scheme proves to be the most effective linearization technique for the considered setup, with an excellent performance-complexity tradeoff over a wide range of conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system

Diouf

Younes

Noaja

et al. 2017

Optics Communications

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“…The results presented throughout the paper are obtained using Matlab-ADS co-simulation [5], [6]. The CO-OFDM transmitter and receiver ( Fig.…”

Section: Co-ofdm System Modelmentioning

confidence: 99%

“…A large diversity of digital predistortion solutions is studied in literature, mainly for the case of radiofrequency systems [3]. The interest for this type of processing in optical systems is much more recent [4] [5]. The Memory Polynomial (MP) model, or its generalized formulation (GMP), is extensively adopted for its good performance.…”

Section: Introductionmentioning

confidence: 99%

Robustness improvement of compact predistorters in a CO-OFDM system using semiconductor optical amplifiers

Younes

Telescu

Tanguy

et al. 2017

2017 29th International Conference on Microelectronics (ICM)

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This paper focuses on digital signal processing techniques compensating the non-linear effects inherent to optical modulation or amplification within a coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmitter featuring a semiconductor optical amplifier (SOA). Two complementary approaches are specifically considered: crest factor reduction and linearization using a digital baseband predistortion. Two possible implementations are presented for the digital predistortion block. One is the basic solution of static compensation; the other consists in a parallel two-box digital polynomial predistorter (PTB) combining, in parallel, a static nonlinear block with a memory polynomial predistorter. Moreover, we show that a linearization of the dynamic behavior of the transmitter, in addition to peak-to-average power ratio (PAPR) reduction, offers better performance. The robustness of the predistorters or of the combined predistorter/PAPR reduction blocks is assessed for various scenarios. Finally, we propose solutions to improve robustness via multipoint identification or switching strategies for predistortion.

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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 Joint Linearization/Companding Approach for Improving a CO-OFDM Transmitter

Cited by 9 publications

References 16 publications

Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system

Robustness analysis of a parallel two-box digital polynomial predistorter for an SOA-based CO-OFDM system

Robustness improvement of compact predistorters in a CO-OFDM system using semiconductor optical amplifiers

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

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