Low-complexity geometrical shaping for 4D modulation formats via amplitude coding

Bin Chen; Wei Ling; Yi Lei; Yunus Gültekin; Chigo Okonkwo; Alex Alvarado

doi:10.1109/LPT.2021.3125017

Low-complexity geometrical shaping for 4D modulation formats via amplitude coding

Bin Chen (Corresponding author)
, Wei Ling
, Yi Lei
, Yunus Gültekin
, Chigo Okonkwo
, Alex Alvarado

Research output: Contribution to journal › Article › Academic › peer-review

4 Citations (Scopus)

1 Downloads (Pure)

Abstract

—Signal shaping is vital to approach Shannon’s capacity, yet it is challenging to implement at very high speeds. For example, probabilistic shaping often requires arithmetic coding to realize the target distribution. Geometric shaping requires look-up tables to store the constellation points. In this letter, we propose a four-dimensional amplitude coding (4D-AC) geometrical shaper architecture. The proposed architecture can generate in real time geometrically shaped 4D formats via simple logic circuit operations and two conventional quadrature amplitude modulation (QAM) modulators. This letter describes the 4D-AC used in generating approximated versions of two recently proposed 4D orthant symmetric modulation formats with spectral efficiencies of 6 bit/4D-sym and 7 bit/4D-sym, respectively. Numerical results show losses below 0.05 dB when compared against the baseline formats.

Original language	English
Pages (from-to)	1419-1422
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	33
Issue number	24
DOIs	https://doi.org/10.1109/LPT.2021.3125017
Publication status	Published - 15 Dec 2021

Keywords

Achievable information rates
Multidimensional (MD) modulation
Optical fiber communication

Access to Document

10.1109/LPT.2021.3125017

Cite this

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title = "Low-complexity geometrical shaping for 4D modulation formats via amplitude coding",

abstract = "—Signal shaping is vital to approach Shannon{\textquoteright}s capacity, yet it is challenging to implement at very high speeds. For example, probabilistic shaping often requires arithmetic coding to realize the target distribution. Geometric shaping requires look-up tables to store the constellation points. In this letter, we propose a four-dimensional amplitude coding (4D-AC) geometrical shaper architecture. The proposed architecture can generate in real time geometrically shaped 4D formats via simple logic circuit operations and two conventional quadrature amplitude modulation (QAM) modulators. This letter describes the 4D-AC used in generating approximated versions of two recently proposed 4D orthant symmetric modulation formats with spectral efficiencies of 6 bit/4D-sym and 7 bit/4D-sym, respectively. Numerical results show losses below 0.05 dB when compared against the baseline formats.",

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author = "Bin Chen and Wei Ling and Yi Lei and Yunus G{\"u}ltekin and Chigo Okonkwo and Alex Alvarado",

year = "2021",

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doi = "10.1109/LPT.2021.3125017",

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journal = "IEEE Photonics Technology Letters",

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T1 - Low-complexity geometrical shaping for 4D modulation formats via amplitude coding

AU - Chen, Bin

AU - Ling, Wei

AU - Lei, Yi

AU - Gültekin, Yunus

AU - Okonkwo, Chigo

AU - Alvarado, Alex

PY - 2021/12/15

Y1 - 2021/12/15

N2 - —Signal shaping is vital to approach Shannon’s capacity, yet it is challenging to implement at very high speeds. For example, probabilistic shaping often requires arithmetic coding to realize the target distribution. Geometric shaping requires look-up tables to store the constellation points. In this letter, we propose a four-dimensional amplitude coding (4D-AC) geometrical shaper architecture. The proposed architecture can generate in real time geometrically shaped 4D formats via simple logic circuit operations and two conventional quadrature amplitude modulation (QAM) modulators. This letter describes the 4D-AC used in generating approximated versions of two recently proposed 4D orthant symmetric modulation formats with spectral efficiencies of 6 bit/4D-sym and 7 bit/4D-sym, respectively. Numerical results show losses below 0.05 dB when compared against the baseline formats.

AB - —Signal shaping is vital to approach Shannon’s capacity, yet it is challenging to implement at very high speeds. For example, probabilistic shaping often requires arithmetic coding to realize the target distribution. Geometric shaping requires look-up tables to store the constellation points. In this letter, we propose a four-dimensional amplitude coding (4D-AC) geometrical shaper architecture. The proposed architecture can generate in real time geometrically shaped 4D formats via simple logic circuit operations and two conventional quadrature amplitude modulation (QAM) modulators. This letter describes the 4D-AC used in generating approximated versions of two recently proposed 4D orthant symmetric modulation formats with spectral efficiencies of 6 bit/4D-sym and 7 bit/4D-sym, respectively. Numerical results show losses below 0.05 dB when compared against the baseline formats.

KW - Achievable information rates

KW - Multidimensional (MD) modulation

KW - Optical fiber communication

UR - https://www.scopus.com/pages/publications/85118631197

U2 - 10.1109/LPT.2021.3125017

DO - 10.1109/LPT.2021.3125017

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AN - SCOPUS:85118631197

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JO - IEEE Photonics Technology Letters

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ER -

Low-complexity geometrical shaping for 4D modulation formats via amplitude coding

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Keywords

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ICONIC: Increasing the Capacity of Optical Nonlinear Interfering Channels

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Low-complexity geometrical shaping for 4D modulation formats via amplitude coding

Abstract

Keywords

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ICONIC: Increasing the Capacity of Optical Nonlinear Interfering Channels

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