Decision-Feedback Frequency-Domain Volterra Nonlinear Equalizer for IM/DD OFDM Long-Reach PON

Zhang, Junwei; Guo, Changjian; Liu, Jie; Wu, Xiong; Lau, Alan Pak Tao; Lu, Chao; Yu, Siyuan

doi:10.1109/jlt.2019.2915329

Cited by 19 publications

(6 citation statements)

References 15 publications

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“…Note that considering several high-order Volterra series terms may be able to describe the actual satellite channels more accurately and help design improved nonlinear detectors. However, the resultant modelling complexity can become excessive and the instability of the nonlinearity compensation tends to increase [42]. Hence, we use the popular third-order Volterra-series expansion model (refer to [34] for details of nonlinear satellite channels) to decompose the nth discrete received symbol as:…”

Section: B Dispersive Nonlinear Satellite Channelsmentioning

confidence: 99%

Low-Complexity Iterative Detection for Dual-Mode Index Modulation in Dispersive Nonlinear Satellite Channels

Shi

Nguyen

et al. 2022

IEEE Trans. Commun.

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The integration of terrestrial and satellite communications (Satcom) is advocated for satisfying the challenging requirements of seamless, high-performance services. However, both the bandwidth and the power available are limited over satellite channels. In this paper, we propose index modulation (IM) and code-aided Satcom by conveying information by a pair of distinguishable constellation modes and their permutations. In order to combat both the linear and nonlinear distortion imposed by satellite channels, we conceive a factor graph (FG)based iterative detection algorithm for Satcom relying on dualmode (DM) IM (Sat-DMIM). The correlation amongst Sat-DMIM symbols imposed by both the channel-induced dispersion and the mode-selection mapping is explicitly represented by the FG constructed. Then the amalgamated belief propagation (BP) and mean field (MF) message passing algorithm is derived over this FG for detecting both the IM bits and the classic constellation mapping bits, while eliminating both the linear and nonlinear distortions. The complexity of the iterative detection algorithm is reduced by linearizing some high-order terms appearing in nonlinear distortion components using the a posteriori estimates of the Sat-DMIM symbols obtained from the previous iteration. Our simulation results demonstrate the power of the proposed amalgamated BP-MF-based and partial linearization approximation-based iterative detection algorithms.

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Section: B Dispersive Nonlinear Satellite Channelsmentioning

confidence: 99%

Low-Complexity Iterative Detection for Dual-Mode Index Modulation in Dispersive Nonlinear Satellite Channels

Shi

Nguyen

et al. 2022

IEEE Trans. Commun.

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“…Furthermore, it is theoretically resistant to polarization mode dispersion up to 30 ps. On the other hand, a coherent system is only the beginning, the main part of these systems is electrical and in particular digital signal processing (DSP) signal processing [102][103][104][105][106][107][108][109][110].…”

Section: Future Developmentmentioning

confidence: 99%

Passive Optical Networks Progress: A Tutorial

et al. 2020

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For many years, passive optical networks (PONs) have received a considerable amount of attraction regarding their potential for providing broadband connectivity to almost every citizen, especially in remote areas where fiber optics can attract people to populate regions that have been abandoned. Error-free connectivity without dropouts can offer new opportunities to communicate, earn money and enjoy cultural events. Transmission speeds are multigigabit with distances of a few tens of kilometers; these specifications were previously reserved for high-speed and long-haul backbone networks. PONs can also support a new class of applications, such as accurate time transfer or distributed fiber sensing and follow new trends in open networking. An outline of past and current standards and standards that have been proposed for the latest generation of multigigabit PONs is provided.

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“…In all these previous works, the several non-linear distortion sources (i.e., the modulus square relation between the optical field and detected electrical current for DD, the cosine-like relation between the electrical driving signals and the optical field at the optical IQ-MZ modulator (IQ-MZM) output, and the optical fiber nonlinearity), have not been directly compensated. Many nonlinear pre-and post-compensations have been proposed in the electronic domain, such as Volterra non-linear equalization (VNLE) or neural-network equalization (NNE) [12][13][14][15]. However, all these techniques are still very complex as compared with standard DSP implemented in current transceivers.…”

Section: Introduction Ext-generation Passive Optical Network (Pon) and Datamentioning

confidence: 99%

100 Gbps/λ C-Band CD Digital Pre-Compensated and Direct-Detection Links With Simple Non-Linear Compensation

et al. 2021

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In the scenario of downstream Passive Optical Networks (PON), we analyze through simulations and experiments a 100 Gbps/λ link using digital signal processing (DSP) over up to 50 km single mode fiber (SMF) in C-band. In particular, we propose chromatic dispersion digital pre-compensation (CD-DPC) and quaternary pulse amplitude modulation (PAM-4) levels optimization at the transmitter side (TX), and simple non-linear compensation (NLC) in combination with adaptive equalization (AEQ) at the receiver side (RX). Regarding NLC, we compare two approaches: a quadratic polynomial function and a square-root-like function respectively. In this paper, we analyze in detail the performances of four proposed options, namely equispaced PAM-4 levels without NLC (baseline case), equispaced PAM-4 levels in combination with NLC, optimized PAM-4 levels without NLC, and optimized PAM-4 levels in combination with NLC. We demonstrate through simulations and experiments that optimized PAM-4 levels can only offer limited enhancement when NLC is applied, and up to 3.3 dB sensitivity gain can be obtained thanks to NLC at RX when setting the optimum parameters, with respect to the baseline case.

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Decision-Feedback Frequency-Domain Volterra Nonlinear Equalizer for IM/DD OFDM Long-Reach PON

Cited by 19 publications

References 15 publications

Low-Complexity Iterative Detection for Dual-Mode Index Modulation in Dispersive Nonlinear Satellite Channels

Low-Complexity Iterative Detection for Dual-Mode Index Modulation in Dispersive Nonlinear Satellite Channels

Passive Optical Networks Progress: A Tutorial

100 Gbps/λ C-Band CD Digital Pre-Compensated and Direct-Detection Links With Simple Non-Linear Compensation

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