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Color and intensity shift keying modulation method for visible light communication system

A technology of visible light communication and shift keying, which is applied in the field of visible light communication, can solve the problems of poor high-order modulation performance, achieve the effect of increasing the degree of freedom of spatial distribution, improving the bit error rate of symbols, and increasing the minimum Euclidean distance

Active Publication Date: 2017-11-10
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical defect of poor high-order modulation performance of traditional indoor CSK modulation technology, the present invention provides a joint color and intensity shift keying modulation method for visible light communication system

Method used

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  • Color and intensity shift keying modulation method for visible light communication system
  • Color and intensity shift keying modulation method for visible light communication system
  • Color and intensity shift keying modulation method for visible light communication system

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Embodiment 1

[0030] On the basis of the existing traditional indoor CSK modulation technology, the present invention designs an optical modulation scheme with better high-order performance, namely CISK modulation, aiming at its disadvantage of poor high-order modulation performance.

[0031] The basic principle of the new CISK scheme proposed by the present invention is to combine the two technologies of NZL-PAM and CSK modulation, and additionally carry the CSK signal on the optical signal with varying intensity. This combination method extends the original CSK two-dimensional constellation diagram to three-dimensional space, which increases the degree of freedom of the spatial distribution of symbols. At the same time, by rationally designing the level of NZL-PAM, it can achieve the effect of increasing the MED of the constellation diagram and improving the system SER. . To simplify the notation, the PAM methods referred to in the following analysis are all NZL-PAM. figure 1 A system bl...

Embodiment 2

[0053] Taking the 8-CISK system combining 2-PAM and 4-CSK as an example, the joint CISK modulation scheme proposed by the present invention and the optimization design process of PAM level will be described below. It should be pointed out that the combined CISK modulation scheme and PAM level optimization design method proposed by the present invention are also applicable to systems combining PAM and CSK of other modulation orders.

[0054] The original binary data is divided into two channels of binary original data through a splitter, one channel is 2-PAM binary data, and the other channel is 4-CSK binary data. 1-bit 2-PAM binary data is mapped to L through the PAM modulator 1 or L 2 These two PAM levels are then fed into the multiplier block. The 2-bit 4-CSK binary data enters a 4-CSK color shift keying modulation module for modulation, first carries out chroma symbol mapping, and then utilizes formula (3) to generate normalized RGB three primary color component values ​​...

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Abstract

The invention presents a color and intensity shift keying (CISK) modulation method for a visible light communication (VLC) system. The basic principle is to combine a non-zero-level pulse amplitude modulation (NZL-PAM) technology and a color-shift keying (CSK) modulation technology and add a CSK signal to a variable-intensity optical signal. Through the combination, the two-dimensional constellation diagram of original CSK is extended to a three-dimensional space, and the degree of freedom of spatial distribution of symbols is increased. Meanwhile, through reasonable design of the level of NZL-PAM, the minimum Euclidean distance of the constellation diagram can be increased, and the symbol error rate of the system can be enhanced.

Description

technical field [0001] The present invention relates to the field of visible light communication (Visible Light Communication, VLC), and more specifically, to a joint color and intensity shift keying (Color and Intensity ShiftKeying, CISK) modulation method for a visible light communication system. Background technique [0002] With the development of modern science and technology and the widespread application of light-emitting diodes (Light-emitting Diode, LED) in daily life, the VLC technology based on LED lamps has gradually attracted the attention of all parties and has launched research on it. VLC mainly uses intensity modulation (Intensity Modulation, IM) and direct detection (Direct Detection, DD) technology to realize the transmission of information by using the rapid light intensity changes imperceptible to the human eye, so as to support lighting and communication at the same time. [0003] The research and development of VLC technology and its potential applicati...

Claims

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Application Information

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IPC IPC(8): H04B10/516H04B10/54H04B10/50H04B10/69H04B10/116
CPCH04B10/116H04B10/502H04B10/516H04B10/541H04B10/69
Inventor 江明陈文俊李正鹏
Owner SYSU CMU SHUNDE INT JOINT RES INST
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