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Adaptive weighted geometric shaping method and device

An adaptive weighting and geometric technology, applied in the field of optical communication, can solve the problems of high calculation and transmission length limitation, and achieve the effect of increasing transmission distance, reducing distortion, and reducing algorithm complexity.

Active Publication Date: 2021-09-07
BEIJING UNIV OF POSTS & TELECOMM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive weighted geometric shaping method and device to alleviate the technical problems that the geometric shaping algorithm in the prior art is affected by nonlinearity, limited by the transmission length and has relatively high computational complexity

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  • Adaptive weighted geometric shaping method and device

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Embodiment 1

[0033] According to an embodiment of the present invention, an embodiment of an adaptive weighted geometric shaping method is provided. It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

[0034] figure 1 A flow chart of an adaptive weighted geometric shaping method provided by an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0035] Step S101, determine the modulation order, and initialize the QAM constellation diagram based on the modulation order, to obtain the initialized concentric regular hexagonal QAM constellation diagram;

[0036] In the embodiment of the present invention, the modulation order (abbreviated as order) of the conce...

Embodiment 2

[0070] An embodiment of the present invention provides an adaptive weighted geometric shaping device, the adaptive weighted geometric shaping device is mainly used to implement the adaptive weighted geometric shaping method provided in the above content of Embodiment 1, and the following provides the embodiments of the present invention The adaptive weighted geometric shaping device is introduced in detail.

[0071] Figure 9 It is a schematic structural diagram of an adaptive weighting geometric shaping device provided by an embodiment of the present invention. Such as Figure 9 As shown, the geometric shaping device for adaptive weighting mainly includes: a determination initialization unit 11, a mapping recording unit 12, a first determination unit 13 and a generation unit 14, wherein:

[0072] Determine the initialization unit 11, for determining the modulation order, and initialize the QAM constellation diagram based on the modulation order, to obtain the initialized co...

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Abstract

The present invention provides an adaptive weighted geometric shaping method and device, which relate to the technical field of optical communication, including: determining the modulation order first, and initializing the QAM constellation diagram based on the modulation order to obtain the initialized concentric regular hexagonal Shape the QAM constellation diagram; then map the transmitted signal to the first constellation point, and record the coordinates of the first constellation point; then determine the adaptive weighting factor based on the coordinates of the first constellation point and the set optical fiber transmission distance; finally based on the adaptive The weighting factor and the coordinates of the first constellation point generate a geometrically shaped QAM constellation diagram, so as to map and modulate the transmitted signal according to the geometrically shaped QAM constellation diagram to generate a geometrically shaped QAM signal. The invention can greatly reduce the distortion caused by the Kerr nonlinear effect in the transmission process of the generated geometrically shaped QAM signal, effectively increase the optical fiber transmission distance, and has low algorithm complexity.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an adaptive weighted geometric shaping method and device. Background technique [0002] Constellation shaping technology has been proved to be a promising technology in optical communication because it can effectively improve the spectral efficiency of the modulated signal and approach the Shannon limit, and has become one of the current research hotspots. Currently, common constellation shaping mainly includes geometric shaping, probability shaping and geometric probability mixed shaping. Among them, the geometric shaping technique uses non-uniformly spaced constellations of equal probability symbols to obtain shaping gains. [0003] At present, the existing geometric shaping algorithms, such as pairwise optimization algorithm, minimum mean square error optimization algorithm, and optimization algorithm based on deep learning, etc., have high algorithm complexity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04L27/36
CPCH04L27/3416H04L27/366
Inventor 忻向军张琦周文茂吴曼青姚海鹏赵永利王光全高然田凤田清华常欢王富郭栋王拥军杨雷静王曦朔
Owner BEIJING UNIV OF POSTS & TELECOMM