Real-Time FPGA Investigation of Interplay Between Probabilistic Shaping and Forward Error Correction

Zhang, Liangjun; Tao, Kai; Qian, Weixing; Wang, Weiming; Liang, Junpeng; Cai, Yi; Feng, Zhenhua

doi:10.1109/jlt.2021.3128490

Cited by 17 publications

(7 citation statements)

References 35 publications

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“…We consider the generalized mutual information (GMI) as main physical layer performance metric. GMI has demonstrated its effectiveness in providing the most resilient predictions for post-FEC BER, especially when using soft-decision FEC across different constellation sizes and particularly in systems utilizing uniform square quadrature amplitude modulation (QAM) [16][17] [18]. It is computed as:…”

Section: Physical Layer Performance Emulationmentioning

confidence: 99%

“…The rate of the code (𝑅 0 ) is 111/128 = 0.867. [18] gives a detailed evaluation of oFEC performance through a real-time implementation and provides as well as performance predictor the corresponding NGMI.…”

Section: Physical Layer Performance Emulationmentioning

confidence: 99%

“…Based on Figure 11 in [18], we estimated visually 𝑁𝐺𝑀𝐼 0 of oFEC to be roughly 0.92 at post-FEC BER of 10 −10 . Due to the time-varying fading nature of the optical feeder link, 𝑁𝐺𝑀𝐼 is not constant with time.…”

Section: Physical Layer Performance Emulationmentioning

confidence: 99%

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Coherent optical feeder links for very high throughput satellite systems

Canuet

2024

Free-Space Laser Communications XXXVI

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Satellite-to-ground optical feeder links are envisioned in the framework of Very-High-Throughput-Satellite (VHTS) systems. Such optical feeder links need to provide aggregated useful data rates in the range of several hundred Giga-bitsper-second (Gbps). To reach this goal, one of the required fundamental technologies consists in the transmission of more spectrally and energy efficient modulation format relying on coherent intradyne detection. The latter enables complex modulation formats and the use of both polarizations of the signal to transmit polarization-multiplexed data streams. Such coherent intradyne transceivers commonly used for fiber-based applications rely on digital signal processing to recover information after having compensated a range of transmission impairments. Free-space optical communication through the atmosphere for satellite-to-ground link presents fundamentally different characteristics from which stem deleterious impairments to the signal's quality. We present an investigation through end-to-end simulations of the performance of coherent transceivers for use in optical feeder links based VHTS systems. To base our analysis on realistic channel conditions, we use data acquired during the first demonstration of an adaptive optics (AO) pre-compensated uplink to a Geosynchronous (GEO) satellite as well as data generated by a representative laboratory emulator.

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Section: Physical Layer Performance Emulationmentioning

confidence: 99%

Section: Physical Layer Performance Emulationmentioning

confidence: 99%

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Coherent optical feeder links for very high throughput satellite systems

Canuet

2024

Free-Space Laser Communications XXXVI

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“…ZTE has presented many impressive FPGA-based FEC experiments over the years. For example, FEC solutions for OIF-800GZR have been evaluated using a large number of FPGAs to reach very low BERs within short run-times [10]. Here, a complete transmitter is implemented on FPGAs, to generate a pseudo-random input bitstream, perform FEC encoding, interleaving and symbol mapping.…”

Section: B Similar Approachesmentioning

confidence: 99%

Fiber-on-Chip: Digital Emulation of Channel Impairments for Real-Time DSP Evaluation

Borjeson

Larsson-Edefors

2023

J. Lightwave Technol.

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We describe the Fiber-on-Chip (FoC) approach to verification of digital signal processing (DSP) circuits, where digital models of a fiber-optic communication system are implemented in the same hardware as the DSP under test. The approach can enable cost-effective long-term DSP evaluations without the need for complex optical-electronic testbeds with high-speed interfaces, shortening verification time and enabling deep bit-error rate evaluations. Our FoC system currently contains a digital model of a transmitter generating a pseudo-random bitstream and a digital model of a channel with additive white Gaussian noise, phase noise and polarization-mode dispersion. In addition, the FoC system contains digital features for real-time control of channel parameters, using low-speed communication interfaces, and for autonomous real-time analysis, which enable us to batch multiple unsupervised emulations on the same hardware. The FoC system can target both field-programmable gate arrays, for fast evaluation of fixed-point logic, and applicationspecific integrated circuits, for accurate power dissipation measurements.

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“…However, it is not yet commonly implemented in commercial systems. One of the reasons for this is that the approach is not yet mature with virtually no hardware prototypes demonstrating constellation shaping and its performance in realistic transmission systems [3][4][5]. In addition, the existing literature is focused on the implementation of the DSP chain components related to constellation shaping, such as constellation demappers and distribution matchers.…”

Section: Innovationmentioning

confidence: 99%