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Signal generation method and device based on hybrid probability shaping and geometric shaping

A technology for signal generation and signal shaping, applied in the direction of error correction/detection, encoding, optical fiber transmission, etc. by combining multiple code structures, can solve the problems of system reliability discount, insufficient to effectively improve communication system capacity and transmission distance, etc. , to improve the transmission capacity and transmission distance, approach the Shannon limit, and improve the effect of the minimum Euclidean distance

Active Publication Date: 2020-09-04
FUDAN UNIV
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-order modulation format greatly reduces the reliability of the system, which is not enough to effectively improve the capacity and transmission distance of the communication system

Method used

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  • Signal generation method and device based on hybrid probability shaping and geometric shaping
  • Signal generation method and device based on hybrid probability shaping and geometric shaping
  • Signal generation method and device based on hybrid probability shaping and geometric shaping

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Embodiment 1

[0044] The present invention provides a signal generation method based on mixed probability shaping and geometric shaping, comprising the following steps:

[0045] Generate optimal geometric shaping signal constellation diagram;

[0046] receiving the original bit stream, dividing the original bit stream into two branches, which are defined as an upper branch and a lower branch, and obtaining the upper branch through CCDM encoding based on a given probability shaping depth and the optimal geometric shaping signal constellation Symbols with different probabilities are mapped to a symbol sequence that satisfies the Maxwell-Boltzmann distribution in the first quadrant. The bit stream of the lower branch is not processed, and the combination of the symbol sequence and the lower branch is LDPC encoded to obtain the parity of the equal probability distribution. A check bit sequence, combining the parity check bit sequence and the lower branch to form a folded index bit sequence, so ...

Embodiment 2

[0059] Such as figure 2 As shown, this embodiment provides a signal generation device based on mixed probability shaping and geometric shaping, the device generates a mixed probability shaping and geometric shaping signal based on the received original bit stream, and the device divides the original bit stream into two branches, defined as the upper branch and the lower branch, including:

[0060] The geometric shaping constellation diagram generation module is used to generate the optimal geometric shaping signal constellation diagram, and the specific steps are as follows figure 1 shown;

[0061] CCDM encoder module 1, based on the given probability shaping depth and the optimal geometric shaping signal constellation, the upper branch is mapped into a symbol sequence satisfying the Maxwell-Boltzmann distribution;

[0062] LDPC encoder module 2, for encoding the combination of the symbol sequence and the lower branch to obtain a parity check bit sequence of equal probabili...

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Abstract

The invention relates to a signal generation method and device based on hybrid probability shaping and geometric shaping. The method comprises the following steps: generating an optimal geometric shaping signal constellation diagram; receiving an original bitstream; dividing an original bit stream into two branches; mapping the upper branch into a symbol sequence satisfying Maxwell-Boltzmann distribution through CCDM coding on the basis of a given probability shaping depth and an optimal geometric shaping signal constellation diagram; carrying out lDPC encoding on a combination of the symbol sequence and the lower branch to obtain a parity check bit sequence; combining the parity check bit sequence and the lower branch to form a folded index bit sequence; converting the symbol sequence into an amplitude bit sequence; and carrying out recombination and symbol mapping on the folded index bit sequence and the amplitude bit sequence to generate a hybrid probability shaping and geometric shaping signal. Compared with the prior art, the non-linear transmission damage resistance of signals can be effectively improved, and the transmission capacity and the transmission distance of an optical communication system are improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication systems, and relates to a signal generation method, in particular to a signal generation method and device based on mixed probability shaping and geometric shaping. Background technique [0002] In the field of high-speed optical fiber communication, narrowing the gap between the communication system capacity and the Shannon limit has become an important research topic. With the continuous development of modern optical communication technology, it is of great practical significance to increase the capacity and transmission distance of optical communication systems. [0003] In order to improve the system capacity and spectral efficiency of optical fiber communication systems, 16-QAM, 64-QAM and other higher-order traditional rectangular quadrature amplitude modulation formats have been widely used in optical fiber transmission systems. However, the high-order modulation format...

Claims

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Application Information

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IPC IPC(8): H03M13/29H04B10/25
CPCH03M13/29H03M13/2906H03M13/2948H03M13/2954H04B10/25Y02D30/70
Inventor 余建军丁俊杰孔淼王凯辉张教
Owner FUDAN UNIV
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