CN111342895A - Visible light communication system and receiving circuit thereof - Google Patents
Visible light communication system and receiving circuit thereof Download PDFInfo
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- CN111342895A CN111342895A CN202010129116.0A CN202010129116A CN111342895A CN 111342895 A CN111342895 A CN 111342895A CN 202010129116 A CN202010129116 A CN 202010129116A CN 111342895 A CN111342895 A CN 111342895A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a visible light communication system and a receiving circuit thereof, wherein the receiving circuit comprises a photodiode, a transimpedance amplification module, a filtering module, a logarithmic detection module, a voltage-controlled amplification module and a demodulation module, the photodiode is connected with the transimpedance amplification module, the transimpedance amplification module is connected with the filtering module, the filtering module is respectively connected with the logarithmic detection module and the voltage-controlled amplification module, the logarithmic detection module is connected with the voltage-controlled amplification module, and the voltage-controlled amplification module is connected with the demodulation module. According to the technical scheme, the intensity of the received optical signal is detected through the arrangement of the logarithmic detection module, the detection result is transmitted to the voltage-controlled amplification module, and the voltage-controlled amplification module controls the amplification gain of the converted electric signal of the optical signal according to the detection result of the logarithmic detection module, so that the automatic gain regulation and control functions of the visible light communication system on visible light at different distances are realized, and the communication distance regulation function of the visible light communication system is further realized.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a visible light communication system and a receiving circuit thereof.
Background
In the prior art, there are some methods for modulating optical signals, and common modulation methods include OOK (binary on-off keying), PPM (pulse position modulation), DPIM (digital pulse interval modulation), and DH-PIM (double-ended pulse interval modulation). And because the LED has faster flicker speed, the flicker frequency of the LED lamp commonly on the market can reach 1MHz, thereby providing a prerequisite for visible light communication.
The current visible light communication system model comprises a transmitting part and a receiving part, wherein the transmitting part comprises a signal modulation module, an LED driving module and an LED light source module, and the receiving part comprises a convergence and filtering module, a light detection module, a signal amplification module and a signal demodulation module.
The existing visible light communication system has the following defects that the visible light communication system model receiving part does not adapt to an amplifying circuit therein, namely, the light intensity cannot be amplified in different proportions at different distances, and finally, the visible light communication system can only realize the communication function of fixed transmission distance.
Disclosure of Invention
The present invention is directed to a visible light communication system and a receiving circuit thereof, which solve one or more of the problems in the prior art and provide at least one of the advantages.
The technical scheme adopted for solving the technical problems is as follows:
a receive circuit of a visible light communication system, comprising:
a photodiode for converting a visible light signal into an electrical signal;
the transimpedance amplification module is used for amplifying the electric signal;
the filtering module is used for filtering high-frequency components and low-frequency components in the electric signals;
the logarithmic detection module is used for detecting the intensity of the electric signal;
the voltage-controlled amplification module is used for amplifying the electric signal according to the detection result of the logarithmic detection module;
the demodulation module is used for demodulating the electric signal;
the photodiode is connected with the transimpedance amplification module, the transimpedance amplification module is connected with the filtering module, the filtering module is respectively connected with the logarithmic detection module and the voltage-controlled amplification module, the logarithmic detection module is connected with the voltage-controlled amplification module, and the voltage-controlled amplification module is connected with the demodulation module.
As a further improvement of the above technical solution, the transimpedance amplification module includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, and an operational amplifier U1, one end of the resistor R1 is connected to an inverting input terminal of the operational amplifier U1, the other end of the resistor R1 is grounded, the capacitor C1 is connected in parallel to the resistor R1, one end of the resistor R2 is connected to a non-inverting input terminal of the operational amplifier U1, the other end of the resistor R2 is connected to an output terminal of the operational amplifier U1, the capacitor C2 is connected in parallel to the resistor R2, the photodiode is connected to an inverting input terminal of the operational amplifier U1, and an output terminal of the operational amplifier U1 is connected to the filter module.
As a further improvement of the above technical solution, the filtering module includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C3, a capacitor C4, and an operational amplifier U2, the transimpedance amplification module is connected to the non-inverting input terminal of the operational amplifier U2 through the resistor R3 and the resistor R4 in sequence, one end of the capacitor C3 is connected between the resistor R3 and the resistor R4, the other end of the capacitor C3 is connected to the output terminal of the operational amplifier U2, the non-inverting input terminal of the operational amplifier U2 is connected to the ground through the capacitor C4, the output terminal of the operational amplifier U2 is connected to the ground through the resistor R5 and the resistor R6 in sequence, the inverting input terminal of the operational amplifier U2 is connected between the resistor R5 and the resistor R6, and the output terminal of the operational amplifier U2 is connected to the logarithmic detection module and the voltage-controlled amplification module respectively.
As a further improvement of the above technical solution, the logarithmic detection module includes a logarithmic detector chip with a model number of AD8310, the filtering module is connected to an input end of the logarithmic detector chip, and an output end of the logarithmic detector chip is connected to the voltage-controlled amplification module.
As a further improvement of the above technical solution, the voltage-controlled amplification module includes an amplifier chip with model AD603, the filtering module is connected to an operational amplifier input end of the amplifier chip, an operational amplifier common end of the amplifier chip is grounded, the logarithmic detection module is connected to a gain control end of the amplifier chip, and an operational amplifier output end of the amplifier chip is connected to the demodulation module.
The invention also discloses a visible light communication system which comprises a sending circuit and the receiving circuit, wherein the sending circuit transmits visible light signals to the receiving circuit.
As a further improvement of the above technical solution, the transmitting circuit includes a modulation module, a driving module and an LED light source module, the modulation module is connected to the driving module, the driving module is connected to the LED light source module, and the driving module includes a two-stage signal amplifying unit.
The invention has the beneficial effects that: according to the technical scheme, the intensity of the received optical signal is detected through the arrangement of the logarithmic detection module, the detection result is transmitted to the voltage-controlled amplification module, and the voltage-controlled amplification module controls the amplification gain of the converted electric signal of the optical signal according to the detection result of the logarithmic detection module, so that the automatic gain regulation and control functions of the visible light communication system on visible light at different distances are realized, and the communication distance regulation function of the visible light communication system is further realized.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
FIG. 1 is a circuit architecture framework of the present invention;
fig. 2 is a circuit schematic of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, the present application discloses a receiving circuit of a visible light communication system, a first embodiment of which includes:
a photodiode for converting a visible light signal into an electrical signal;
the transimpedance amplification module is used for amplifying the electric signal;
the filtering module is used for filtering high-frequency components and low-frequency components in the electric signals;
the logarithmic detection module is used for detecting the intensity of the electric signal;
the voltage-controlled amplification module is used for amplifying the electric signal according to the detection result of the logarithmic detection module;
the demodulation module is used for demodulating the electric signal;
the photodiode is connected with the transimpedance amplification module, the transimpedance amplification module is connected with the filtering module, the filtering module is respectively connected with the logarithmic detection module and the voltage-controlled amplification module, the logarithmic detection module is connected with the voltage-controlled amplification module, and the voltage-controlled amplification module is connected with the demodulation module.
In this embodiment, the logarithmic detection module is configured to detect the intensity of the received optical signal, and transmit a detection result to the voltage-controlled amplification module, and the voltage-controlled amplification module controls the amplification gain of the electrical signal after the optical signal is converted according to the detection result of the logarithmic detection module, so that the automatic gain control function of the visible light communication system for visible light at different distances is realized, and the communication distance adjustment function of the visible light communication system is further realized.
Further, in this embodiment, the transimpedance amplification module includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, and an operational amplifier U1, one end of the resistor R1 is connected to an inverting input terminal of the operational amplifier U1, the other end of the resistor R1 is grounded, the capacitor C1 is connected in parallel to the resistor R1, one end of the resistor R2 is connected to a non-inverting input terminal of the operational amplifier U1, the other end of the resistor R2 is connected to an output terminal of the operational amplifier U1, the capacitor C2 is connected in parallel to the resistor R2, the photodiode is connected to an inverting input terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 is connected to the filtering module. In order to ensure that the received optical signal can accurately reflect the light intensity received by the photodiode, the transimpedance amplification module does not bias the photodiode so as to ensure linearity and reduce noise. And converting the current signal of the photodiode into a voltage signal through the transimpedance amplification module.
Further as a preferred implementation manner, in this embodiment, the filtering module includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C3, a capacitor C4, and an operational amplifier U2, the transimpedance amplification module is connected with the non-inverting input end of the operational amplifier U2 through the resistor R3 and the resistor R4 in sequence, one end of the capacitor C3 is connected between the resistor R3 and the resistor R4, the other end of the capacitor C3 is connected with the output end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is grounded through the capacitor C4, the output end of the operational amplifier U2 is grounded through the resistor R5 and the resistor R6 in turn, the inverting input terminal of the op-amp U2 is connected between the resistor R5 and the resistor R6, the output end of the operational amplifier U2 is respectively connected with the logarithmic detection module and the voltage-controlled amplification module. In this embodiment, the filtering module is a band-pass filter, and is configured to filter out low-frequency components in the electrical signal to remove interference of ambient light.
In addition, it is necessary to filter high frequency components in the electrical signal, mainly to facilitate the communication function of multiple transmitting circuits to one receiving circuit in the visible light communication system. In order to prevent the LED light source module emitting the visible light signal from flickering during use, the embodiment needs to operate the carrier in a higher frequency band, and meanwhile, ensures that the brightness can change suddenly during use. The method for solving the problems in the embodiment is to improve the flickering frequency of the LED light source module, utilize the characteristic that the amplitude of a common white light LED is rapidly reduced after the frequency exceeds 1Mhz, improve the flickering frequency of the LED light source module which does not send signals to be more than 1Mhz, and filter the high-frequency signals again through the filtering module, thereby realizing multi-machine communication.
Further, in a preferred embodiment, in this embodiment, the logarithmic detection module includes a logarithmic detector chip with a model number of AD8310, the filtering module is connected to an input end of the logarithmic detector chip, and an output end of the logarithmic detector chip is connected to the voltage-controlled amplification module.
Further, in this embodiment, the voltage-controlled amplification module includes an amplifier chip of type AD603, a resistor R7, a resistor R8, and a resistor R9, where the resistor R7 and the resistor R8 are connected in series between a power supply and ground, the filter module is connected to an operational amplifier input end (pin 3) of the amplifier chip, an operational amplifier common end (pin 4) of the amplifier chip is grounded, the logarithmic detection module is connected to a reverse gain adjustment end (pin 2) of the amplifier chip, a forward gain adjustment end (pin 1) of the amplifier chip is connected between the resistor R7 and the resistor R8, an operational amplifier output end (pin 7) of the amplifier chip is connected to the demodulation module, and the operational amplifier output end (pin 7) of the amplifier chip is connected to a feedback network end (pin 5) of the amplifier chip through a resistor R9.
In this embodiment, the demodulation module includes an STM32 single chip microcomputer and a peripheral circuit thereof, and the flow of the demodulation module for realizing the demodulation function includes: receiving the level, starting a counter and setting the identifier as a first jump when positive jump of the level is received; continuing to receive the level, when positive jump of the level is received again, enabling the identifier to be added by one by the counter, recording the data of the counter and comparing the data with the target frequency, determining the period or frequency of the received signal, outputting the high and low levels corresponding to the frequency according to the frequency range, and judging whether the reset is needed; and returning to the previous step, and circularly demodulating in real time all the time.
The application also discloses a visible light communication system simultaneously, its first embodiment include transmitting circuit and above receiving circuit, transmitting circuit is to receiving circuit transmission visible light signal, transmitting circuit includes modulation module, drive module and LED light source module, modulation module with drive module links to each other, drive module with LED light source module links to each other, drive module includes two-stage signal amplification unit.
In this embodiment, the driving module includes a two-stage signal amplifying unit, wherein the first-stage signal amplifying unit amplifies the weak electrical signal output by the modulation module by using two triodes, and the second-stage signal amplifying unit further amplifies the electrical signal by using an equivalent darlington tube formed by two triodes, so as to drive the LED light source module.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (7)
1. A receiving circuit of a visible light communication system, characterized in that: the method comprises the following steps:
a photodiode for converting a visible light signal into an electrical signal;
the transimpedance amplification module is used for amplifying the electric signal;
the filtering module is used for filtering high-frequency components and low-frequency components in the electric signals;
the logarithmic detection module is used for detecting the intensity of the electric signal;
the voltage-controlled amplification module is used for amplifying the electric signal according to the detection result of the logarithmic detection module;
the demodulation module is used for demodulating the electric signal;
the photodiode is connected with the transimpedance amplification module, the transimpedance amplification module is connected with the filtering module, the filtering module is respectively connected with the logarithmic detection module and the voltage-controlled amplification module, the logarithmic detection module is connected with the voltage-controlled amplification module, and the voltage-controlled amplification module is connected with the demodulation module.
2. The receiving circuit of claim 1, wherein: the transimpedance amplification module comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an operational amplifier U1, one end of the resistor R1 is connected with the inverting input end of the operational amplifier U1, the other end of the resistor R1 is grounded, the capacitor C1 is connected with the resistor R1 in parallel, one end of the resistor R2 is connected with the non-inverting input end of the operational amplifier U1, the other end of the resistor R2 is connected with the output end of the operational amplifier U1, the capacitor C2 is connected with the resistor R2 in parallel, the photodiode is connected with the inverting input end of the operational amplifier U1, and the output end of the operational amplifier U1 is connected with the filter module.
3. The receiving circuit of claim 1, wherein: the filter module comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C3, a capacitor C4 and an operational amplifier U2, the transimpedance amplifier module is connected with the non-inverting input end of the operational amplifier U2 through the resistor R3 and the resistor R4 in sequence, one end of the capacitor C3 is connected between the resistor R3 and the resistor R4, the other end of the capacitor C3 is connected with the output end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is connected to the ground through the capacitor C4, the output end of the operational amplifier U2 is connected to the ground through the resistor R5 and the resistor R6 in sequence, the inverting input end of the operational amplifier U2 is connected between the resistor R5 and the resistor R6, and the output end of the operational amplifier U2 is connected with the logarithmic detection module and the voltage-controlled amplifier module respectively.
4. The receiving circuit of claim 1, wherein: the logarithmic detection module comprises a logarithmic detector chip with the model number of AD8310, the filtering module is connected with the input end of the logarithmic detector chip, and the output end of the logarithmic detector chip is connected with the voltage-controlled amplification module.
5. The receiving circuit of claim 1, wherein: the voltage-controlled amplification module comprises an amplifier chip with the model of AD603, the filtering module is connected with the operational amplifier input end of the amplifier chip, the operational amplifier common end of the amplifier chip is grounded, the logarithmic detection module is connected with the gain control end of the amplifier chip, and the operational amplifier output end of the amplifier chip is connected with the demodulation module.
6. A visible light communication system, characterized by: comprising a transmitting circuit and a receiving circuit according to any of claims 1 to 5, the transmitting circuit transmitting a visible light signal to the receiving circuit.
7. The visible light communication system according to claim 6, wherein: the transmitting circuit comprises a modulation module, a driving module and an LED light source module, wherein the modulation module is connected with the driving module, the driving module is connected with the LED light source module, and the driving module comprises two stages of signal amplification units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010129116.0A CN111342895A (en) | 2020-02-28 | 2020-02-28 | Visible light communication system and receiving circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010129116.0A CN111342895A (en) | 2020-02-28 | 2020-02-28 | Visible light communication system and receiving circuit thereof |
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| CN111342895A true CN111342895A (en) | 2020-06-26 |
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Application publication date: 20200626 |