Results 11 to 20 of about 117,447 (292)
An Uplink SCMA Codebook Design Combining Probabilistic Shaping and Geometric Shaping
IEEE Access, 2020 Sparse Code Multiple Access (SCMA) is a promising non-orthogonal multiple access scheme owning to the shaping gain of its multi-dimensional codebook. Most of the existing designs of the codebook are based on geometric shaping (GS), while probabilistic ...
Chengxin Jiang, Yafeng Wang
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Two-Dimensional Constellation Shaping in Fiber-Optic Communications
Applied Sciences, 2019 Constellation shaping has been widely used in optical communication systems. We review recent advances in two-dimensional constellation shaping technologies for fiber-optic communications. The system architectures that are discussed include probabilistic
Zhen Qu +2 more
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On the Probabilistic Shaping and Geometric Shaping in Optical Communication Systems
IEEE Access, 2019 We introduce and compare typical shaping schemes suitable for optical communications. The geometrically shaped-quadrature amplitude modulation (GS-QAM) formats are characterized by the non-equidistant spacing of constellation points, transmitted ...
Zhen Qu, Ivan B. Djordjevic
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IEEE Access, 2019 A probabilistic shaping method based on reduced-exponentiation subset indexing and honeycomb-structured constellation optimization is proposed to compress the number of signal points in the constellation, so that the total number doesn't fit the ...
Xiangyu Wu +8 more
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On Geometric Shape Construction via Growth Operations [PDF]
Theoretical Computer Science, 2022 In this work, we investigate novel algorithmic growth processes. In particular, we propose three growth operations, full doubling, RC doubling and doubling, and explore the algorithmic and structural properties of their resulting processes under a geometric setting.
Nada Almalki, Othon Michail
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Transmission of OCDM Based on Asymmetric Pair Mapping Over a Seven Core Fiber
IEEE Photonics Journal, 2022 In this paper, transmission of orthogonal chirp division multiplexing (OCDM) based on asymmetric pair mapping over a seven core fiber is proposed. High-order 32 quadrature amplitude modulation (QAM) is reduced to quadrature phase-shift keying (QPSK) and ...
Shuaidong Chen +12 more
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Increasing Achievable Information Rates via Geometric Shaping [PDF]
, 2018 Achievable information rates are used as a metric to design novel modulation formats via geometric shaping. The proposed geometrically shaped 256-ary constellation achieves SNR gains of up to 1.18 dB.Comment: Additional references have been ...
Alvarado, Alex +3 more
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Deep Learning of Geometric Constellation Shaping including Fiber Nonlinearities [PDF]
, 2018 A new geometric shaping method is proposed, leveraging unsupervised machine learning to optimize the constellation design. The learned constellation mitigates nonlinear effects with gains up to 0.13 bit/4D when trained with a simplified fiber channel ...
Eriksson, Tobias A. +3 more
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MAIN DIRECTIONS IN GEOMETRIC SHAPING OF REGULAR DISCRETE STRUCTURES IN DESIGN
Архитектон, 2021 The article expands on some important aspects in the geometric shaping of regular discrete structures in different areas of design and architecture and outlines main promising directions for their development.
Korotich Andrey V.
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Inferring a Transcriptional Regulatory Network from Gene Expression Data Using Nonlinear Manifold Embedding [PDF]
, 2010 Transcriptional networks consist of multiple regulatory layers corresponding to the activity of global regulators, specialized repressors and activators of transcription as well as proteins and enzymes shaping the DNA template.
Hossein Zare +2 more
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