Visible light communication color shift keying modulation method based on multi- pulse positions

A technology of visible light communication and color shift keying, applied in the field of visible light communication

Active Publication Date: 2017-05-31
SHANDONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The key of the present invention is to artificially add pseudo-noise in the three-color lamp to identify the combination information of the pulse position, thus solving the problem of diversification of color shift keyi

Method used

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  • Visible light communication color shift keying modulation method based on multi- pulse positions
  • Visible light communication color shift keying modulation method based on multi- pulse positions
  • Visible light communication color shift keying modulation method based on multi- pulse positions

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Embodiment

[0062] A color shift keying modulation method for visible light communication based on multi-pulse positions, such as image 3 As shown, a three-color lamp is used as the transmitter and three photodetectors with filters are used as the receiver to transmit data. The specific modulation and transmission steps include:

[0063] (1) Encoding the transmitted signal X(t): the transmitted signal X(t) includes the number of bits of color shift keying and the number of bits modulated by the multi-pulse position combination in the three-color lamp, through the color shift keying The coordinates of the number of modulated bits on the 1931CIE chromaticity space and the coordinates of the respective color bands of the three-color lamps on the 1931CIE chromaticity space are used to determine the emission power intensity of the three-color lamps. The specific steps include:

[0064] A, obtain the coordinates (x) of the number of bits modulated by the color shift keying on the 1931 CIE chro...

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Abstract

The invention relates to a visible light communication color shift keying modulation method based on multi- pulse positions. According to the method, a method integrated with multi- pulse position combinations and color shift keying modulation is applied to visible light communication modulation for the first time, and the position combination identification problem of the color shift keying modulation when not all of three colour lights transmit power is solved. According to the method, artificial pseudo-noise acts in identifying the time slot pulse position combinations of the three colour lights, and in a symbol cycle, the light colours tend to be white light. According to the pulse time slot position combinations of multi-color lights introduced into the method, information can be transmitted through different pulse time slot position combinations of the three colour lights. Compared with traditional color shift keying and pulse position modulation, the method has the advantage that the frequency effect is at least doubled. Utilization of the artificial pseudo-noise in the method is that judgment is carried out based on a maximum likelihood estimation algorithm, and through adoption of dual-threshold judgment, the system has relatively good anti-interference performance.

Description

technical field [0001] The present invention relates to a multi-pulse position-based color shift keying modulation method for visible light communication, in particular to the combination of pseudo-noise (Pseudo-Noise, PN for short), multi-pulse position modulation (MPPM) and color shift keying (CSK) modulation A modulation method suitable for visible light communication belongs to the technical field of visible light communication. Background technique [0002] With the rapid growth of the demand for wireless data communication, the available wireless spectrum below 10G is becoming more and more scarce. Visible light occupies the frequency band from 400THz to 800THz. Because it has abundant spectrum resources and can well solve the problem of wireless spectrum shortage, it has received extensive attention. Compared with traditional radio frequency communication, visible light communication communicates data through the intensity of light. It can simultaneously realize the ...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/516
CPCH04B10/116H04B10/5161
Inventor 张文胜宋健孙健王承祥
Owner SHANDONG UNIV
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