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A predistortion method and device based on visible light communication system

A visible light communication and predistortion technology, applied in the field of communication, can solve problems such as high complexity, increased computational complexity, and inability to describe the nonlinear characteristics of LEDs well.

Active Publication Date: 2020-10-27
YANGZHONG INTELLIGENT ELECTRICAL INST NORTH CHINA ELECTRIC POWER UNIV
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Problems solved by technology

Its main disadvantages: 1) As a general model with high precision for fitting any curve, the polynomial model usually needs to use higher-order terms to achieve high model description precision, and a large number of terms will lead to Increase in computational complexity
2), Rapps model and Saleh model are behavior models of traveling wave tubes and power amplifiers in microwave radio frequency communication. The proposals of the two are not aimed at the electrical or electro-optical characteristics of LEDs, so they cannot describe the nonlinear characteristics of LEDs well.
Its main disadvantage is that if you want to get high-precision pre-distortion processing, you have higher requirements on the dimension and complexity of the data table
[0005] In summary, the distortion correction technology in the existing VLC system has the disadvantages of low accuracy and high complexity

Method used

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  • A predistortion method and device based on visible light communication system
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  • A predistortion method and device based on visible light communication system

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Embodiment Construction

[0030] In order to clearly illustrate the solutions of the present invention, preferred embodiments are given below and described in detail with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the application or usage of the present disclosure. It should be understood that in all the drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0031] Such as figure 1 Shown. A direct predistortion method based on a visible light communication system, the method including:

[0032] S101: Obtain a modulated signal; specifically, the signal passes an encoder and a modulator to obtain a modulated signal.

[0033] S102: Perform inverse transformation on the modulation signal through a predistortion inverse transformation model; the predistortion inverse transformation model is an inverse transformation model of a Gaussian characteristic nonlinear behavior model of LED input...

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Abstract

The invention discloses a pre-distortion method and device based on a visible light communication system. The method comprises the following steps: acquiring a modulation signal; and performing inverse transformation on the modulation signal through a pre-distortion inverse transformation model, wherein the modulation signal acquires a linear signal after passing through an LED. The problem that the distortion correction technology is low in precision and high in complexity in the existing VLC system is solved, the method has the advantages of being simple in structure and low in complexity, and the operation resource of the system can be saved.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a predistortion method and device based on a visible light communication system. Background technique [0002] Visible light communication (VLC for short) is a wireless optical communication technology that uses light emitting diodes (LEDs for short) as signal transmitters and photoelectric detection devices as receivers. VLC technology has the advantages of wide application, saving radio frequency spectrum resources, high confidentiality performance and no electromagnetic radiation. In the application of VLC technology, due to the non-linear effect of the electro-optical characteristics of the LED, the modulated signal emitted from the LED produces harmonic distortion and intermodulation distortion, which reduces the communication performance of the system. In order to slow down the non-linear effects of LEDs, techniques such as limiting the modulation depth in the li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/516H04L25/49
CPCH04B10/116H04B10/516H04L25/49
Inventor 刘鹏吴荣钊
Owner YANGZHONG INTELLIGENT ELECTRICAL INST NORTH CHINA ELECTRIC POWER UNIV
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