Robustness combined optimization method for optical filter parameters during multi-color visible light communication process

A technology of visible light communication and joint optimization, applied in electromagnetic receivers, short-range systems, free space transmission, etc.

Active Publication Date: 2017-07-11
SOUTHEAST UNIV
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Problems solved by technology

[0008] In the visible light communication scenario, the receiver may be in the working state of the deflection angle. When the deflection angle is large, the pass

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  • Robustness combined optimization method for optical filter parameters during multi-color visible light communication process
  • Robustness combined optimization method for optical filter parameters during multi-color visible light communication process
  • Robustness combined optimization method for optical filter parameters during multi-color visible light communication process

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Embodiment Construction

[0065] The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0066] This specific embodiment discloses a robust joint optimization method for filter parameters in multi-color visible light communication, such as figure 1 shown, including the following steps:

[0067] S1: Taking the four-color optical communication system as an example, the sending end uses the LZ4-00MA00 LED produced by LED Engin Company. Under the same driving current of 700mA, use a spectrometer to measure the spectra of the four colors of light R, A, G, and B Curve, use the He model to fit the spectral curve, such as figure 2 As shown, "—" represents the actual measured spectrum, "--" represents the fitted spectrum, and the four peaks from left to right are blue, green, yellow, and red spectra, so as to obtain the fitting function of the spectrum ;

[0068] S2: Determine the filter parameters to be optim...

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Abstract

The present invention discloses a robustness combined optimization method for optical filter parameters during the multi-color visible light communication process. The method comprises the following steps of S1, measuring the spectral curve of each monochromatic light by utilizing a spectrometer, and fitting the spectral curve by utilizing a He model so as to obtain the fitting function of the spectrum; S2, determining a to-be-optimized optical filter parameter; S3, deriving a detected mean-square error by a receiver based on the LMMSE detection method; S4, calculating out the probability information of a user in room distribution position so as to obtain a probability density function for the light incident angle of a receiving end; S5, subjecting the detected mean-square error to the weighted treatment based on the probability density function for the light incident angle, so as to obtain a mean-square error at an average angle; S6, cooperatively solving an optimal value of each optical filter parameter based on the two-layer iteration algorithm. According to the technical scheme of the invention, the optimal value of the joint optimization for each color of an optical filter can be obtained, and the cross-interference between different colors is reduced. Meanwhile, when light rays are deflected at a certain angle, the receiver can still work normally.

Description

technical field [0001] The invention relates to the field of multicolor visible light communication, in particular to a method for robust joint optimization of filter parameters in multicolor visible light communication. Background technique [0002] With the development of technology, wireless spectrum resources are becoming more and more scarce. In recent years, visible light communication, as a supplement to radio frequency wireless communication, has become a research hotspot in the field of communication. However, compared with radio frequency wireless communication, visible light wireless communication has poor penetration and is easily blocked by objects, so visible light wireless communication system can be used as the last 20 meters of radio frequency wireless communication, suitable for indoor communication, and other short-distance communication. [0003] The polychromatic light system in visible light communication uses the method of mixing polychromatic light ...

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Application Information

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IPC IPC(8): H04B10/116H04B10/60
CPCH04B10/116H04B10/60
Inventor 梁霄葛鹏飞王家恒赵春明
Owner SOUTHEAST UNIV
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