Real-Time Polarization Demultiplexing by Multi-Thread Constant Modulus Algorithm for Fully Softwarized Access Networks

Suzuki, Takahiro; Kim, Sang-Yuep; Kani, Jun‐ichi; Yoshida, Tomoaki

doi:10.1109/jlt.2022.3225061

J. Lightwave Technol.

2023

DOI: 10.1109/jlt.2022.3225061

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Real-Time Polarization Demultiplexing by Multi-Thread Constant Modulus Algorithm for Fully Softwarized Access Networks

Takahiro Suzuki

Sang-Yuep Kim

Jun‐ichi Kani

et al.

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Cited by 3 publications

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“…Additionally, given the trend to apply digital signal processing (DSP) in access networks [11], softwarization of DSP has been commenced. While some works softwarize DSP for applications such as data center interconnect [12], [13], 10 Gb/s DSP including carrier phase recovery (CPE), polarization demultiplexing, and decoding have been demonstrated running on generalpurpose graphic processing units (GPUs) [14], [15]. While GPUs achieve high-speed processing by parallel processing on many cores, the challenge was serial processing of DSP, which cannot be parallelized.…”

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confidence: 99%

Real-Time Wide-Range Carrier Frequency Offset Compensation by Multi-Thread PADE for Fully Softwarized Access Networks

Suzuki,

Kim,

Kani

et al. 2024

IEEE Access

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With the evolution of access systems by network function virtualization (NFV) and the software-defined network (SDN), further softwarization including transmission functions is required in order to fully utilize the advantages that softwarization offers to network operators in terms of more flexible and rapid service creation and migration. The softwarization of digital signal processing (DSP) is a prime target, but frequency offset compensation (FOC) has serial processing, which makes its softwarization difficult. In particular, the pre-decision-based angle differential estimator (PADE) of wide-range FOC needs long serial iterations since it obtains stable solutions by using small loop gain in the loop filter. This paper proposes a multiplication-based FOC implementation and a novel multi-thread PADE algorithm for real-time softwarization. The multiplication-based implementation enables parallel compensation of phase rotation by multiplying the estimated CFOs by sampling numbers for Viterbi-and-Viterbi (VV) method and PADE. In addition, our multi-thread PADE algorithm significantly reduces the iterations needed for FOC estimation; using multi-threading, it estimates multiple frequency offsets using the loop filters with large loop gain. This calculation needs relatively few iterations, but its outputs are very noisy, and final frequency offset estimates are obtained after removing the noise by clustering and averaging the results. The results of simulations and experiments, which use a general-purpose server with a graphic processing unit, show that our PADE algorithm is 1,308 times faster than the conventional implementation and 5-Gb/s real-time processing is achieved while maintaining the FOC performance. INDEX TERMS SDN, PON, Softwarization, DSP and frequency offset compensation I. INTRODUCTION

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confidence: 99%

Real-Time Wide-Range Carrier Frequency Offset Compensation by Multi-Thread PADE for Fully Softwarized Access Networks

Suzuki,

Kim,

Kani

et al. 2024

IEEE Access

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Real-Time Software Implementation of Filter-Separated MIMO Adaptive Equalizer for Fully Virtualized Access Networks

Hisano,

Suzuki,

Nishida

et al. 2024

IEEE Photonics J.

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Virtualization and Softwarization in Optical Access Networks

SUZUKI,

KIM,

KANI

et al. 2023

IEICE Fundamentals Review

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Optical access networks are undergoing a transformation from conventional dedicated equipment to configurations using general-purpose hardware, as the requirements are diversifying owing to the emergence of various advanced applications. By applying software-defined networks (SDN) and network function virtualization (NFV) to the access system, SDN-enabled broadband access (SEBA), a virtualized access platform that abstracts various access systems and can be commonly controlled by software on general-purpose hardware, has been commercially deployed by some overseas carriers. As a future form, an architecture is being considered, in which lower layer network applications share resources on general-purpose hardware with edge applications by expanding the software domain of the system. In this paper, we touch on the virtualization of optical access networks, trends in the standardization of NFV/SDNs, the status of open source software (OSS) development, and trends in research to expand the domain of softwarization and their technologies.

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Real-Time Polarization Demultiplexing by Multi-Thread Constant Modulus Algorithm for Fully Softwarized Access Networks

Cited by 3 publications

References 24 publications

Real-Time Wide-Range Carrier Frequency Offset Compensation by Multi-Thread PADE for Fully Softwarized Access Networks

Real-Time Wide-Range Carrier Frequency Offset Compensation by Multi-Thread PADE for Fully Softwarized Access Networks

Real-Time Software Implementation of Filter-Separated MIMO Adaptive Equalizer for Fully Virtualized Access Networks

Virtualization and Softwarization in Optical Access Networks

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