A communication method based on probability shaping

A communication method and probability technology, applied in the field of wireless optical communication, to achieve the effect of reducing distortion effects

Active Publication Date: 2022-02-11
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In the above existing schemes, the probabilistic shaping technique is usually only used to approach the Shannon capacity limit, but the shaping gain embodied in the probabilistic shaping technique makes it have great potential to alleviate nonlinear distortion

Method used

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  • A communication method based on probability shaping
  • A communication method based on probability shaping
  • A communication method based on probability shaping

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0012] Embodiments of the present invention take into account nonlinear distortions within wireless optical communication systems. First initialize the position and probability of the PAM constellation points, and use distribution matching, such as the constant composition distribution matching (ConstantComposition Distribution Matching, CCDM) proposed by scholars Schulte P and Bocherer G in the article "Constant composition distribution matching", to generate the corresponding symbol sequence, where A part is used as a training sequence. The training sequence is used to estimate the transmission characteristics and the noise power at the same time. Then combined with the estimated transmission characteristics and noise power, decision decoding is performed on the received signal. Finally, the mutual information between the transmitted signal...

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Abstract

The invention discloses a communication method based on probability shaping, which includes the following steps: S1, initializing the amplitude and probability of PAM constellation points; S2, based on the initialized amplitude and probability, generating a corresponding PAM symbol sequence by using distribution matching, and Converting the PAM symbol sequence into a final transmission signal; wherein, using a part of the PAM symbol sequence as a training sequence; S3, using the training sequence to estimate the transmission function and noise power of the channel; S4, using the estimated transmission function and noise power to perform decision decoding at the receiving end to obtain the decoded signal; S5, calculate the mutual information between the transmitted signal and the decoded signal, and use an iterative method to solve the PAM constellation point position that maximizes the mutual information and the corresponding probabilities. The invention can effectively alleviate the distortion caused by the nonlinearity of the light source device.

Description

technical field [0001] The invention relates to the field of wireless optical communication, in particular to a communication method based on probability shaping. Background technique [0002] Optical Wireless Communication (OWC) is a technology that uses wireless light waves for communication, and has the advantages of high speed and high security. However, OWC may be affected by nonlinearity in practical applications, and the nonlinearity of light source devices such as light emitting diodes (Light Emitting Diode, LED) is one of the main sources. The nonlinearity of LED is reflected in the bilateral clipping of the transmitted signal with too large or too small amplitude, resulting in signal distortion. Therefore, in order to ensure the quality of communication, it is necessary to alleviate this nonlinear distortion. [0003] Commonly used nonlinear mitigation methods can be mainly divided into two types: compensation and desensitization. Among them, the former mainly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/524H04B10/54H04B10/516
CPCH04B10/524H04B10/541H04B10/5161
Inventor 董宇涵阳帆耿祖航李志德权进国金爽
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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