Polarization coding method and system of visible light communication channel based on Gaussian approximation

A technology of visible light communication and polarization coding, which is applied in short-distance systems, transmission systems, digital transmission systems, etc., and can solve the problems of not being able to know the channel selection scheme and not doing too many descriptions

Active Publication Date: 2019-06-14
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, on the issue of channel selection, the patent did not describe to

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  • Polarization coding method and system of visible light communication channel based on Gaussian approximation
  • Polarization coding method and system of visible light communication channel based on Gaussian approximation
  • Polarization coding method and system of visible light communication channel based on Gaussian approximation

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Embodiment Construction

[0083] The present invention will be further described below in conjunction with drawings and embodiments.

[0084] see figure 1 , a polarization coding method for visible light communication channels based on Gaussian approximation, comprising:

[0085] S1, setting a visible light communication model and a modulation method; according to the visible light communication model and modulation method, an expression of a Bhattachary parameter used to describe the quality of the channel is obtained;

[0086] S2, calculate the initial likelihood value of the channel according to the signal-to-noise ratio set initially, and use the Gaussian approximation quantization algorithm to calculate the logarithmic likelihood ratio of each sub-channel According to the log-likelihood ratio of each subchannel Obtain the Bhattacharyachian parameter Z(W) of N subchannels, and N is the code length of the polar code set;

[0087] S3, sorting the Bhattacharyian parameters of the N subchannels, a...

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Abstract

The invention discloses a polarization coding method of a visible light communication channel based on Gaussian approximation. The method comprises: S2, determining an initial likelihood value of a channel according to a signal to noise ratio of an initial setting, and determining a frequency of each subchannel by using a Gaussian approximation quantization algorithm Log likelihood ratio accordingto the log likelihood ratio of each subchannel obtains the Pap parameter Z(W) of N subchannels, N is the code length of the set polarization code; S3, sorts the Pap parameters of the N subchannels, sorts according to the code rate The latter Pap s parameter selects the information bit set and the frozen bit set; thereby analyzing the quality of each subchannel; the smaller the Pap s parameter, the larger the channel capacity of the representative channel, so that a better channel can be selected. S4, combining the information bit set to generate the matrix GN; S5, linearly mapping the sourceinformation to be transmitted according to the generated matrix GN into a coding sequence The encoding of the polarization code in the visible light communication channel is completed.

Description

technical field [0001] The present invention relates to the technical field of channel coding for visible light communication, in particular to a Gaussian approximation-based polarization coding method and system for visible light communication channels. Background technique [0002] Visible light communication is a development trend of future communication, which provides communication functions while taking into account lighting. Compared with RF, it has high security, green communication, and can use the frequency spectrum between 400THz and 800THz for free, free from electromagnetic interference, and can be used in RF-sensitive fields such as aircraft cabins, hospitals, and petrochemical industries. The visible light communication system includes three parts: the visible light communication transmitting part, the visible light communication channel model, and the visible light communication receiving part. The LED drive circuit at the sending end encodes the information...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/516H04B17/391H04L1/00
Inventor 耿魁伟渠文宽黄华茂姚若河
Owner SOUTH CHINA UNIV OF TECH
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