Visible light communication channel modeling method based on measured data

Abstract

The invention discloses a visible light communication channel modeling method based on measured data, relates to the technical field of visible light communication (VLC), is used for solving the problem of low accuracy of free space channel modeling in the design process of an integrated circuit special for visible light communication, and comprises the following steps: selecting a light source, a photoelectric detector and supporting facilities thereof; building a test platform; recording S parameter data; and generating an S parameter file, importing the S parameter file into integrated circuit design software, and performing integrated circuit simulation. According to the method, the accuracy of free space channel modeling in the design process of the fully integrated visible light communication system can be remarkably improved, so that the design success rate of an integrated circuit special for visible light communication can be improved, and the design cost of multiple iterations in the design and manufacturing process of the integrated circuit is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of visible light communication (VLC) technology, and particularly relates to a visible light communication channel modeling method based on measured data. BACKGROUND

[0002] Compared with traditional lighting sources, LED light sources have the advantages of high brightness, small size, low power consumption, easy driving, long service life, green environmental protection, and good modulation characteristics, i.e., short photoelectric response time. Therefore, LED light sources can be used for data transmission and communication. Visible light communication technology is developed on the basis of LED light source technology. With the increasing share of LED light sources in the lighting market year by year, visible light communication technology based on LED light sources has broad development prospects.

[0003] After rapid development for more than ten years, visible light communication technology is constantly developing and improving, and the demand for visible light communication special chips with independent intellectual property rights is increasing. However, there is a technical problem in the design process of visible light communication special chips, that is, how to accurately model the optoelectronic devices (such as LED light sources, condenser lenses, APD / PIN photodetectors, etc.) and the free space channel, while also considering the modeling compatibility of integrated circuit design software. SUMMARY

[0004] To solve the bottleneck problem in the prior art, the present application provides a visible light communication channel modeling method based on measured data to improve the accuracy of free space channel modeling in the design process of a fully integrated visible light communication system.

[0005] The technical problem to be solved by the present application is to provide a free space channel modeling method that is accurate, efficient, and suitable for the design of a fully integrated visible light communication system. The entire modeling process includes four steps:

[0006] First, select a light source, a photodetector, and their supporting facilities suitable for the current application scenario.

[0007] Second, build a model data test platform.

[0008] Third, record the parameter data.

[0009] Fourth, generate an S-parameter file from the data measured in the third step and import it into integrated circuit design software for integrated circuit simulation.

[0010] The beneficial effects of the present application are as follows:

[0011] 1. The modeling method described in the application can realize customized modeling, accurately model optical communication links based on different hardware foundations, and has high model accuracy and good simulation accuracy.

[0012] 2. The modeling method described in the application has low operation cost and does not require high instrument equipment, and common optical communication test platforms can meet the requirements, so that the test scheme in the application has high feasibility. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0014] Figure 1 The model data test system building diagram provided for the embodiments of the present application;

[0015] Figure 2 The actual application schematic diagram in the simulation software scenario provided for the embodiments of the present application. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0017] First, select the light source, photodetector and its supporting facilities suitable for the current application scenario. Select the visible light communication light source, that is, select the wavelength range and optical power value of the light source. After selecting the light source, select the appropriate condenser lens according to the size of the light source, and according to the requirements of the actual application scenario and communication rate, select whether to introduce a filter to filter out the yellow light part with slow response in the white light component. Select the photodetector, that is, select the type, responsivity, response wavelength range and other parameters of the photodetector, and according to the requirements of the actual application scenario and communication rate, select whether to introduce a condenser lens and a filter.

[0018] Second, build a test platform as shown in the accompanying drawings Figure 1The test platform shown in the figure. In the transmitting part, a radio frequency signal generator is used as the input signal of the whole system, the signal output by the radio frequency signal generator is input into the transmitting end control module, the signal is processed by the transmitting end control module and then used to drive the LED light source, the LED light source converts the electrical signal into an optical signal, the optical signal is irradiated to the surface of the photodetector through the free space channel, the photodetector converts the optical signal into a photo-generated current signal, the photo-generated current signal is converted into a voltage signal with a proper swing through the receiving end control module, and finally input into the spectrum analyzer, the frequency value and the power value of the output signal of the receiving end control module are measured through the spectrum analyzer.

[0019] The third step is to record the data. The frequency and power of the radio frequency signal generator are changed, the frequency and power measured by the spectrum analyzer are recorded, and the S parameter data in the simulation frequency band are obtained after being sorted.

[0020] The fourth step is to generate the S parameter file of the data measured in the third step and import it into the integrated circuit design software to perform integrated circuit simulation. Figure 2

[0021] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A method for modeling a visible light communication channel based on measured data, the method comprising: The whole modeling process is divided into four steps, (1) select the appropriate light source, photodetector and its supporting facilities for the current application scenario; (2) build a test platform; (3) record data; (4) generate S parameter file from the data measured in the third step, and import it into integrated circuit design software for integrated circuit simulation.

2. The light source, photodetector and their accessories selected to suit the current application scenario according to claim 1, characterized in that: Select the visible light communication light source, that is, select the wavelength range and optical power value of the light source. After selecting the light source, select the appropriate condenser lens according to the size of the light source. According to the requirements of the actual application scene and the communication rate, select whether to introduce a filter to filter out the yellow light part with slow response in the white light component. Select the photodetector, that is, select the type, responsivity, response wavelength range and other parameters of the photodetector. According to the requirements of the actual application scene and the communication rate, select whether to introduce a condenser lens and a filter.

3. The test platform built out of claim 1, wherein: In the transmitting part, a radio frequency signal generator is used as the input signal of the whole system. The signal output by the radio frequency signal generator is input into the transmitting end control module. After being processed by the transmitting end control module, the signal is used to drive the LED light source. The LED light source converts the electrical signal into an optical signal. After passing through the free space channel, the optical signal irradiates the surface of the photodetector. The photodetector converts the optical signal into a photo-generated current signal. The photo-generated current signal is converted into a voltage signal with appropriate swing by the receiving end control module. Finally, it is input into the spectrum analyzer. The frequency value and power value of the output signal of the receiving end control module are measured by the spectrum analyzer.

4. The recording data according to claim 1, characterized by: Change the frequency and power of the radio frequency signal generator. Record the frequency and power measured by the spectrum analyzer. Organize the S parameter data in the simulation frequency band.

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