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Low-Complexity Geometric Shaping
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DOI：10.1109/JLT.2020.3033031.png)
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Abstract
En 中文
Approaching Shannon's capacity via geometric shaping has usually been regarded as challenging due to modulation and demodulation complexity, requiring look-up tables to store the constellation points and constellation bit labeling. To overcome these challenges, in this article, we study lattice-based geometrically shaped modulation formats in multidimensional Euclidean space. We describe and evaluate fast and low complexity modulation and demodulation algorithms that make these modulation formats practical, even with extremely high constellation sizes with more than 10(28) points. The uncoded bit error rate performance of these constellations is compared with the conventional quadrature amplitude modulate (QAM) formats in the additive white Gaussian noise and nonlinear fiber channels. At a spectral efficiency of 2 bits/sym/polarization, compared with 4-QAM format, transmission reach improvement of more than 38% is shown at the hard-decision forward error correction threshold of 2.26 x 10(-4).
Keywords:
Lattices
Constellation diagram
Demodulation
Gain
Complexity theory
Indexes
Optical communication
coherent receiver
multidimensional modulation format
geometric shaping
lattice
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