CN115001576B - micro-LED predistortion method and system based on visible light communication system, storage medium and intelligent terminal - Google Patents

micro-LED predistortion method and system based on visible light communication system, storage medium and intelligent terminal Download PDF

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CN115001576B
CN115001576B CN202210550484.1A CN202210550484A CN115001576B CN 115001576 B CN115001576 B CN 115001576B CN 202210550484 A CN202210550484 A CN 202210550484A CN 115001576 B CN115001576 B CN 115001576B
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value
preset
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led
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CN115001576A (en
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田朋飞
孙迪
崔旭高
顾而丹
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Yiwu Research Institute Of Fudan University
Fudan University
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Yiwu Research Institute Of Fudan University
Fudan University
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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
    • 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
    • H04B10/50—Transmitters
    • H04B10/58—Compensation for non-linear transmitter output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Optical Communication System (AREA)

Abstract

The application relates to a micro-LED predistortion method, a micro-LED predistortion system, a micro-LED predistortion storage medium and an intelligent terminal based on a visible light communication system, which relate to the field of communication technology and comprise the steps of obtaining a source signal; modulating the source signal to obtain a modulated signal, and performing digital-to-analog conversion on the modulated signal to output a driving signal; when the driving signal is acquired, controlling a preset direct current bias unit to output a preset direct current signal, and controlling a preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal; controlling a preset photoelectric receiving device to receive the optical signal, and performing analog-to-digital conversion processing on the optical signal to output a converted signal; determining an estimated signal from the converted signal and determining a model parameter value from the estimated signal and the source signal; and inputting the model parameter values into a preset predistortion unit to realize predistortion processing. The micro-LED communication device has the effect of reducing the nonlinear condition in the visible light communication process of the micro-LED.

Description

micro-LED predistortion method and system based on visible light communication system, storage medium and intelligent terminal
Technical Field
The application relates to the field of communication technology, in particular to a micro-LED predistortion method, a micro-LED predistortion system, a micro-LED predistortion storage media and an intelligent terminal based on a visible light communication system.
Background
With the development of society, the radio frequency wireless communication system of electromagnetic spectrum has some bottleneck limitations, such as limited transmission bandwidth, low transmission rate, tight spectrum resources, etc. In order to better realize mobile communication, a communication mode with higher frequency and shorter wavelength of visible light serving as a transmission medium becomes a research hot spot in the communication field, wherein indoor LED lighting equipment is used for replacing a radio frequency base station to perform data transmission, the communication rate can reach tens of megabytes or even hundreds of megabytes per second, and compared with a radio frequency technology, the visible light communication has the advantages of wider frequency, high safety, faster rate and the like.
With the development of LEDs in the miniaturized direction and the development of the global Internet of things, artificial intelligence and big data, the speed, the efficiency and the time efficiency of information transmission are greatly tested, the speed of a common LED cannot meet the requirement of high-speed communication, at this time, the speed of the LED is improved to be a key for solving the communication speed, the modulation bandwidth of the LED is an important factor for restricting the visible light communication speed, the problem can be well solved by micro-LEDs, the modulation bandwidth of the LED can be improved by reducing the size of the LED, and the modulation bandwidth of the micro-LEDs can reach more than GHz, so that the micro-LEDs are often used as transmission mediums for communication.
With respect to the related art described above, the inventors consider that a nonlinear characteristic occurs during the visible light communication of the micro-LED, so that a phenomenon of distortion occurs in the transmitted information, and there is room for improvement.
Disclosure of Invention
In order to reduce the nonlinear situation in the visible light communication process of the micro-LED, the application provides a micro-LED predistortion method, a micro-LED predistortion system, a storage medium and an intelligent terminal based on a visible light communication system.
In a first aspect, the present application provides a micro-LED predistortion method based on a visible light communication system, which adopts the following technical scheme:
a micro-LED predistortion method based on a visible light communication system comprises the following steps:
acquiring a source signal;
modulating the source signal to obtain a modulated signal, and performing digital-to-analog conversion on the modulated signal to output a driving signal;
when the driving signal is acquired, controlling a preset direct current bias unit to output a preset direct current signal, and controlling a preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal;
controlling a preset photoelectric receiving device to receive the optical signal, and performing analog-to-digital conversion processing on the optical signal to output a converted signal;
determining an estimated signal from the converted signal and determining a model parameter value from the estimated signal and the source signal;
and inputting the model parameter values into a preset predistortion unit to realize predistortion processing.
By adopting the technical scheme, the source signal is obtained, the source signal is modulated to obtain the modulated signal, the modulated signal is converted into the driving signal by digital-to-analog conversion, the signal can be used as an analog signal to be continuously processed, the direct current bias unit can output the pre-direct current signal under the action of the driving signal so as to drive the micro-LED to output the optical signal under the combined action of the driving signal and the pre-direct current signal, the optical signal can be received and processed to be output as a conversion signal in a digital signal mode, the conversion signal can be used for determining the estimated signal, the model parameter value can be determined by the estimated signal and the source signal, the model parameter value is a parameter which can enable the signal to be linear, and the model parameter value is added into the predistortion unit to be predistorted, so that the nonlinear condition in the process of the micro-LED for visible light communication is reduced, and the predistortion processing of the signal is realized.
Optionally, the method further comprises a method for determining an estimated signal, the method comprising:
acquiring a number value, a polynomial order value, a polynomial point order value, a delay value, a maximum delay value and a reference parameter value of a subcarrier;
definition:
estimating the signal as；
Converting signals into；
Numbering value of；
Polynomial expressionOrder value；
Polynomial point order value is；
Delay value of；
Maximum delay value is；
The reference parameter value is；
。
By adopting the technical scheme, the estimated signal can be accurately defined and acquired when the converted signal is acquired, so that the estimated signal can be further used later.
Optionally, the method further comprises a method for determining the model parameter value, and the method comprises the following steps:
acquiring subcarrier quantity information of subcarriers;
determining a source in-phase component value and a source quadrature component value from the source signal and determining an estimated in-phase component value and an estimated quadrature component value from the estimated signal;
calculating according to the subcarrier number information, the source in-phase component value, the source quadrature component value, the estimated in-phase component value and the estimated quadrature component value to determine an error vector amplitude;
judging whether the amplitude of the error vector is smaller than a preset fixed threshold value or not;
if the error vector amplitude is smaller than the fixed threshold, outputting an estimation completion signal and defining a reference parameter value at the moment as a model parameter value;
and if the error vector amplitude is not smaller than the fixed threshold, controlling the reference parameter value to adjust a preset fixed value along a preset fixed direction to update the reference parameter value until an estimation completion signal is output.
By adopting the technical scheme, the corresponding error vector amplitude can be calculated by utilizing the source signal and the estimated signal, whether the current reference parameter value meets the linearity requirement can be determined by comparing the error vector amplitude with the fixed threshold value, so that the reference parameter value is continuously corrected to adjust the error vector amplitude for continuous judgment, the reference parameter value meeting the requirement can be obtained, the reference parameter value is defined as the model parameter value for use, and the signal can be linearly represented.
Optionally, the method further comprises a method for determining the amplitude of the error vector, and the method comprises the following steps:
definition:
error vector magnitude is；
The number of the sub-carriers corresponding to the number information is；
The source in-phase component value is；
The source orthogonal component value is；
Estimating the in-phase component value as；
Estimating the orthogonal component values as；
。
By adopting the technical scheme, the error vector amplitude can be accurately calculated, so that the error vector amplitude can be conveniently judged later.
Optionally, the method further comprises a modulation method of source signal modulation processing, and the method comprises the following steps:
inputting a source signal to a preset subcarrier mapping unit to output a mapping signal;
performing inverse fast fourier transform processing on the mapping signal to output a transformed signal;
the conversion signal is input to a preset parallel-serial conversion unit to output a modulation signal.
By adopting the technical scheme, the mapping processing can be carried out on the source signals so as to enable the serial signals to be changed into parallel signals, at the moment, the inverse fast Fourier transform processing is carried out on the mapping signals so as to reduce the complexity of the subsequent convolution operation time, and the parallel-serial transform unit is utilized so as to enable the parallel signals to be changed into the serial signals, so that the modulated signals subjected to the modulation processing can be used for subsequent normal use.
Optionally, the method further comprises:
and performing cyclic prefix adding processing on the converted signal when the converted signal is in the parallel-serial conversion unit.
By adopting the technical scheme, the cyclic prefix is added to synchronize signals, so that the situation of error codes is reduced.
Optionally, the method further comprises:
after the photoelectric receiving device receives the optical signal, the optical signal is input into a preset amplifying and filtering unit for amplifying and filtering treatment, and the optical signal after the treatment is output for analog-to-digital conversion.
By adopting the technical scheme, the received optical signal can be amplified and filtered, so that the subsequent analog-to-digital conversion of the optical signal is more convenient.
In a second aspect, the application provides a micro-LED predistortion system based on a visible light communication system, which adopts the following technical scheme:
a micro-LED predistortion system based on a visible light communication system, comprising:
the acquisition module is used for acquiring a source signal;
the processing module is connected with the acquisition module and used for storing and processing information;
the processing module carries out modulation processing on the source signal to obtain a modulation signal, and carries out digital-to-analog conversion processing on the modulation signal to output a driving signal;
the processing module controls the preset direct current bias unit to output a preset direct current signal when the driving signal is acquired, and controls the preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal;
the processing module controls the preset photoelectric receiving equipment to receive the optical signal, and performs analog-to-digital conversion processing on the optical signal to output a converted signal;
the processing module determines an estimated signal according to the converted signal and determines a model parameter value according to the estimated signal and the source signal;
the processing module inputs the model parameter value into a preset predistortion unit to realize predistortion processing.
By adopting the technical scheme, the acquisition module is utilized to acquire the source signal, the processing module is utilized to modulate the source signal to acquire the modulation signal, the modulation signal is utilized to perform digital-to-analog conversion processing to become the driving signal, the signal can be used as an analog signal to perform continuous processing, the direct current bias unit can output the pre-direct current signal under the action of the driving signal so as to drive the micro-LED to output the optical signal under the combined action of the driving signal and the pre-direct current signal, the optical signal can be received and processed to output the conversion signal in a digital signal mode, the conversion signal can be utilized to determine the estimation signal, the model parameter value can be determined by utilizing the estimation signal and the source signal, the model parameter value is a parameter capable of enabling the signal to be linear, the model parameter value is added into the predistortion unit to perform predistortion processing, so that the nonlinear condition in the process of the micro-LED in the visible light communication process is reduced, and the predistortion processing of the signal is realized.
In a third aspect, the present application provides an intelligent terminal, which adopts the following technical scheme:
an intelligent terminal comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and execute any micro-LED predistortion method based on a visible light communication system.
By adopting the technical scheme, the source signal is acquired through the use of the intelligent terminal, the source signal is modulated to acquire the modulated signal, the modulated signal is converted into the driving signal through digital-to-analog conversion, the signal can be used as an analog signal to be continuously processed, the direct current bias unit can output the pre-direct current signal under the action of the driving signal to drive the micro-LED to output the optical signal under the combined action of the driving signal and the pre-direct current signal, the optical signal can be received and processed to be output through the conversion signal in a digital signal mode, the estimated signal can be determined through the conversion signal, the model parameter value can be determined through the estimated signal and the source signal, the model parameter value is a parameter which can enable the signal to be linear, and the model parameter value is added into the predistortion unit to be subjected to predistortion processing, so that the nonlinear condition in the process of visible light communication of the micro-LED is reduced, and the predistortion processing of the signal is realized.
In a fourth aspect, the present application provides a computer storage medium, capable of storing a corresponding program, and having the feature of reducing the occurrence of a nonlinear condition in a visible light communication process by a micro-LED, which adopts the following technical scheme:
a computer readable storage medium storing a computer program capable of being loaded by a processor and executing any one of the micro-LED predistortion methods based on a visible light communication system described above.
By adopting the technical scheme, the storage medium is provided with the computer program based on the micro-LED predistortion method of the visible light communication system, the source signal is acquired, the source signal is modulated to acquire the modulated signal, the modulated signal is converted into the driving signal by digital-analog conversion, the signal can be used as an analog signal to be continuously processed, the direct current bias unit can output the predistortion signal under the action of the driving signal to drive the micro-LED to output the optical signal under the combined action of the driving signal and the predistortion signal, the optical signal can be received and processed to be output by a conversion signal in a digital signal mode, an estimated signal can be determined by using the conversion signal, a model parameter value can be determined by using the estimated signal and the source signal, the model parameter value is a parameter which can enable the signal to be linear, and the model parameter value is added into the predistortion unit to be predistortion processed, so that the nonlinear condition in the process of the visible light communication of the micro-LED is reduced, and the predistortion processing of the signal is realized.
In summary, the present application includes at least one of the following beneficial technical effects:
1. determining a model parameter value under modulation processing to realize predistortion processing of signals, wherein the condition of distortion of transmission information is not easy to occur in the process of communication transmission of the signals;
2. determining the model parameter values by utilizing continuous correction of the reference parameter values so that the acquired model parameter values can meet the requirements;
3. the cyclic prefix is added to the signals so that the signals can be synchronized, the situation of error codes is reduced, and the stability in the signal transmission process is improved.
Drawings
Fig. 1 is a flow chart of a predistortion method.
Fig. 2 is a flow chart of a model parameter value determination method.
Fig. 3 is a flow chart of a modulation method.
Fig. 4 is a schematic diagram of the connection of the units.
Fig. 5 is a block flow diagram of a predistortion system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings 1 to 5 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Embodiments of the application are described in further detail below with reference to the drawings.
The embodiment of the application discloses a micro-LED predistortion method based on a visible light communication system, which is used for determining model parameter values according to the condition of source signals, so that the model parameter values in a predistortion unit can meet predistortion processing requirements, nonlinear characteristics are not easy to occur in the process of carrying out visible light communication by the micro-LEDs, and distortion is not easy to occur when information is transmitted.
Referring to fig. 1, a method flow of micro-LED predistortion based on a visible light communication system includes the steps of:
step S100: a source signal is acquired.
The source signal is a group of random signals generated by matlab software, and is a string of binary sequences, the method for obtaining the source signal is to receive the binary sequences, and the method is a conventional technical means for those skilled in the art and will not be described in detail.
Step S101: the source signal is modulated to obtain a modulated signal, and the modulated signal is digital-to-analog converted to output a driving signal.
The modulation processing method is further described later, and is not described here again; the modulation signal is subjected to digital-to-analog conversion processing, and then the modulation signal of the original digital signal can be adjusted into a driving signal of an analog signal, so that the subsequent driving signal is a continuous signal to continuously act on other units, wherein the digital-to-analog conversion processing is completed by a D/A conversion unit, the D/A conversion unit can be a D/A converter, and the sending code element rate of the D/A conversion unit can be 0-10Gbaut/s.
Step S102: and when the driving signal is acquired, controlling the preset direct current bias unit to output a preset direct current signal, and controlling the preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal.
When a driving signal is obtained, a direct current bias unit can be enabled to output a pre-direct current signal so that a micro-LED can be started under the combination of the driving signal and the pre-direct current signal to output an optical signal, wherein the direct current bias unit is a device for adding direct current bias to the micro-LED, the micro-LED is a light source, a basic structure sequentially comprises a substrate, an n-GaN layer, an InGaN/GaN quantum well layer and a p-GaN epitaxial layer from bottom to top, the wavelength of the emitted optical signal is 400-550nm, the size of the micro-LED is 0.5-300um, and the-3 dB modulation bandwidth of each micro-LED is 30MHz-8GHz.
Step S103: and controlling the preset photoelectric receiving equipment to receive the optical signal, and performing analog-to-digital conversion processing on the optical signal to output a converted signal.
The photoelectric receiving equipment can be used for receiving the optical signals output by the micro-LEDs so as to facilitate the subsequent further processing of the optical signals, wherein the photoelectric receiving equipment is a photodiode, the photodiode can be an avalanche photodiode, a PIN photodiode, a photomultiplier or a Schottky photodiode, and the specific type of the photodiode is selected by a worker according to actual conditions and is not described in detail; the optical signals are subjected to analog-to-digital conversion processing so that each subcarrier is independently output, and at the moment, the optical signals are converted into converted signals for output and use, wherein the analog-to-digital conversion processing is completed by an A/D conversion unit, the A/D conversion unit can be a high-speed oscilloscope or a signal quality analyzer, and specific equipment is selected by staff according to actual conditions and is not repeated.
Step S104: an estimated signal is determined from the converted signal and a model parameter value is determined from the estimated signal and the source signal.
The output conversion signal is used to determine an estimated signal, the determination method is further described later, and the error between the estimated signal and the source signal is used to determine a model parameter value, which is a final parameter of the predistortion processing model, and the predistortion processing can be implemented by using the model parameter value.
Step S105: and inputting the model parameter values into a preset predistortion unit to realize predistortion processing.
The predistortion unit is a modeling unit adopting a memory polynomial model, and the model parameter value is input into the predistortion unit, so that the parameter of the memory polynomial model can be determined, the predistortion unit can realize predistortion treatment, and when a predistortion treated optical signal is used as a transmission medium, the transmission information is not easy to generate distortion.
The method for determining the estimated signal in step S104 is as follows:
the number value, polynomial order value, polynomial point order value, delay value, maximum delay value and reference parameter value of the subcarrier are obtained.
The number value is the number value of the subcarrier, that is, the number of the subcarrier, the polynomial order value, the polynomial point order value, the delay value and the maximum delay value are all basic parameters of the subcarrier, and the acquisition method is a conventional technical means of those skilled in the art and will not be described in detail; the reference parameter value is an initial parameter value in the memory polynomial model, and is set in advance by a worker according to actual conditions, and details are omitted.
Definition:
estimating the signal as；
Converting signals into；
Numbering value of；
Polynomial order value of；
Polynomial point order value is；
Delay value of；
Maximum delay value is；
The reference parameter value isThe method comprises the steps of carrying out a first treatment on the surface of the Then
To enable determination of the estimated signal.
Referring to fig. 2, the micro-LED predistortion method based on a visible light communication system further includes a method for determining a model parameter value, the method including:
step S200: and acquiring subcarrier quantity information of subcarriers.
The number value corresponding to the subcarrier number information is the total number value of subcarriers, which can be obtained by counting the subcarriers, and the technical method is a conventional technical means for those skilled in the art, and will not be described in detail.
Step S201: a source in-phase component value and a source quadrature component value are determined from the source signal and an estimated in-phase component value and an estimated quadrature component value are determined from the estimated signal.
The source in-phase component value and the source quadrature component value are the same-direction component and the quadrature component of the source signal respectively,,/>，/>wherein->Is the nth sub-Carrier source signal,/->Source in-phase component value for nth subcarrier, < ->Source quadrature component value for nth subcarrier, < ->For the signal amplitude of the source signal,/->For the signal phase of the source signal,/->And->The acquisition can be carried out through a source signal, and the acquisition method is a conventional technical means of a person skilled in the art and is not repeated; the estimated in-phase component value and the estimated quadrature component value are the co-directional component and the quadrature component of the estimated signal, respectively, +.>,，/>，/>For the estimated in-phase component value of the nth estimated signal,estimated quadrature component value for the nth estimated signal,/->To estimate the signal amplitude of the signal, < >>To estimate the signal phase of a signal +.>And->The signal can be obtained through estimation, and the obtaining method is a conventional technical means for those skilled in the art, and is not described in detail.
Step S202: the error vector magnitude is determined based on subcarrier number information, source in-phase component values, source quadrature component values, estimated in-phase component values, and estimated quadrature component values.
The error vector amplitude is the error between the estimated signal and the source signal, so that whether the reference parameter value meets the requirement is judged; the method for determining the error vector magnitude is as follows:
definition:
error vector magnitude is；
The number of the sub-carriers corresponding to the number information is；
。
Step S203: and judging whether the amplitude of the error vector is smaller than a preset fixed threshold value.
The fixed threshold is a fixed value set in advance, the size of the fixed threshold depends on the service quality requirement of the system, and the purpose of the judgment is to know whether the error between the estimated signal and the source signal meets the requirement or not so as to judge whether the reference parameter value in the memory polynomial model meets the predistortion requirement or not at the moment.
Step S2031: if the error vector amplitude is smaller than the fixed threshold, outputting an estimation completion signal and defining the reference parameter value at the moment as a model parameter value.
When the amplitude of the error vector is smaller than a fixed threshold, the error between the estimated signal and the source signal meets the requirement, an estimated complete signal is output to indicate that the reference parameter value is the optimal parameter value, and the reference parameter value is defined as the model parameter value for identification so as to facilitate the subsequent use of the optimal reference parameter value.
Step S2032: and if the error vector amplitude is not smaller than the fixed threshold, controlling the reference parameter value to adjust a preset fixed value along a preset fixed direction to update the reference parameter value until an estimation completion signal is output.
When the error vector amplitude is not smaller than a fixed threshold, the error between the estimated signal and the source signal at the moment is not satisfied, at the moment, the reference parameter value is controlled to be adjusted, a fixed value is adjusted along a fixed direction, so that the error vector amplitude is continuously judged until the adjusted reference parameter value satisfies the requirement, wherein the fixed direction is a direction which is set in advance and is used for adjusting the reference parameter value to be larger or smaller, the fixed value is a fixed value, and the fixed value is set by staff according to actual conditions and is not repeated; the reference parameter value, i.e. the model parameter value, can be obtained when the error vector magnitude meets the requirements by continuously adjusting the reference parameter value to determine different error vector magnitudes.
Referring to fig. 3 and 4, the micro-LED predistortion method based on a visible light communication system further includes:
a modulation method of a source signal modulation process, the method comprising:
step S300: the source signal is input to a preset subcarrier mapping unit to output a mapping signal.
The source signal is a serial signal, the subcarrier mapping unit is used for realizing that the serial signal is changed into a parallel signal, the subcarrier mapping unit is equipment capable of carrying out mapping processing on subcarriers, and the method is a conventional technical means for those skilled in the art, and the output mapping signal is not repeated for facilitating subsequent further processing.
Step S301: the mapping signal is subjected to an inverse fast fourier transform process to output a transformed signal.
The mapping signal is subjected to inverse fast Fourier transform processing, so that the time complexity of convolution operation of the transformed signal can be reduced, and the subsequent use of the transformed signal is facilitated.
Step S302: the conversion signal is input to a preset parallel-serial conversion unit to output a modulation signal.
The parallel-serial conversion unit is utilized to change the parallel signal into the serial signal, so that the modulation signal capable of outputting the serial signal is used to realize the modulation processing of the source signal, wherein the equipment realized by the parallel-serial conversion unit is a conventional technical means for those skilled in the art, and is not described in detail.
Step S304: and performing cyclic prefix adding processing on the converted signal when the converted signal is in the parallel-serial conversion unit.
The addition of the cyclic prefix enables the signals to be synchronous, reduces the occurrence of error codes, and the method for adding the cyclic prefix is a conventional technical means for those skilled in the art and is not repeated.
Referring to fig. 4, after the photoelectric receiving device receives the optical signal, the optical signal is input into a preset amplifying and filtering unit to perform amplifying and filtering processing, and the processed optical signal is output for analog-to-digital conversion. The output optical signal can be amplified so as to facilitate the subsequent analog-digital conversion, and meanwhile, some clutter is filtered, so that the signal is stable during the subsequent analog-digital conversion, and the amplifying and filtering unit can be composed of an amplifier and a filter, so that the conventional selection of the person skilled in the art is omitted.
The method comprises the following overall steps: inputting the source signal to a subcarrier mapping unit for mapping processing to output a mapping signal; inputting the mapping signal into an IFFT unit with an inverse fast Fourier transform processing function for processing to output a transformed signal; inputting the converted signal to a parallel-to-serial conversion unit to output a modulated signal; the modulating signal is utilized to drive the direct current bias unit to output a pre-direct current signal, and the micro-LED is driven to output an optical signal under the combined action of the adjusting signal and the pre-direct current signal; the optical signal is received by the photoelectric receiving equipment, and then the optical signal is input into the amplifying and filtering unit for amplifying and filtering treatment so as to output the treated optical signal, and then the optical signal is output into the analog-to-digital conversion unit for processing so as to convert the signal in real place; the converted signals are input into a parameter estimation module to form an estimation module, model parameter values are determined through continuous correction calculation of the estimation module, and then the model parameter values are input into a predistortion module to realize predistortion processing.
Referring to fig. 5, based on the same inventive concept, an embodiment of the present application provides a micro-LED predistortion system based on a visible light communication system, including:
the acquisition module is used for acquiring a source signal;
the processing module is connected with the acquisition module and used for storing and processing information;
the processing module carries out modulation processing on the source signal to obtain a modulation signal, and carries out digital-to-analog conversion processing on the modulation signal to output a driving signal;
the processing module controls the preset direct current bias unit to output a preset direct current signal when the driving signal is acquired, and controls the preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal;
the processing module controls the preset photoelectric receiving equipment to receive the optical signal, and performs analog-to-digital conversion processing on the optical signal to output a converted signal;
the processing module determines an estimated signal according to the converted signal and determines a model parameter value according to the estimated signal and the source signal;
the processing module inputs the model parameter value into a preset predistortion unit to realize predistortion processing;
the parameter value determining module is used for determining model parameter values of the polynomial model so as to facilitate subsequent predistortion processing;
a calculation module for determining an estimated signal and an error vector magnitude;
the modulation processing module is used for modulating the source signal;
the cyclic prefix adding module is used for adding a cyclic prefix to the signal so as to reduce the situation of error codes;
and the amplifying and filtering module is used for amplifying and filtering the received optical signals.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. The specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.
Embodiments of the present application provide a computer-readable storage medium storing a computer program capable of being loaded by a processor and executing a micro-LED predistortion method based on a visible light communication system.
The computer storage medium includes, for example: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Based on the same inventive concept, an embodiment of the present application provides an intelligent terminal, including a memory and a processor, wherein the memory stores a computer program capable of being loaded by the processor and executing a micro-LED predistortion method based on a visible light communication system.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. The specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.

Claims (7)

1. A micro-LED predistortion method based on a visible light communication system, comprising:
acquiring a source signal;
modulating the source signal to obtain a modulated signal, and performing digital-to-analog conversion on the modulated signal to output a driving signal;
when the driving signal is acquired, controlling a preset direct current bias unit to output a preset direct current signal, and controlling a preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal;
controlling a preset photoelectric receiving device to receive the optical signal, and performing analog-to-digital conversion processing on the optical signal to output a converted signal;
determining an estimated signal from the converted signal and determining a model parameter value from the estimated signal and the source signal;
inputting the model parameter value into a preset predistortion unit to realize predistortion treatment;
the method for determining the estimated signal comprises the following steps:
acquiring a number value, a polynomial order value, a polynomial point order value, a delay value, a maximum delay value and a reference parameter value of a subcarrier;
definition:
estimating the signal as z (n);
converting the signal to y (n);
the number value is n;
the polynomial order value is k;
the polynomial point order value is K;
the delay value is d;
the maximum delay value is D;
the reference parameter value is a k，d ；
The method for determining the model parameter value comprises the following steps:
acquiring subcarrier quantity information of subcarriers;
determining a source in-phase component value and a source quadrature component value from the source signal and determining an estimated in-phase component value and an estimated quadrature component value from the estimated signal;
calculating according to the subcarrier number information, the source in-phase component value, the source quadrature component value, the estimated in-phase component value and the estimated quadrature component value to determine an error vector amplitude;
judging whether the amplitude of the error vector is smaller than a preset fixed threshold value or not;
if the error vector amplitude is smaller than the fixed threshold, outputting an estimation completion signal and defining a reference parameter value at the moment as a model parameter value;
if the error vector amplitude is not smaller than the fixed threshold, controlling the reference parameter value to adjust a preset fixed value along a preset fixed direction to update the reference parameter value until an estimation completion signal is output;
the method for determining the error vector amplitude comprises the following steps:
definition:
the error vector magnitude is EVM;
the number corresponding to the subcarrier number information is N;
the source in-phase component value is I (x) n )；
The source quadrature component value is Q (x n )；
Estimating the in-phase component value as I (z) n )；
Estimating the quadrature component value as Q (z n )；
2. The micro-LED predistortion method based on a visible light communication system according to claim 1, wherein: the modulation method of the source signal modulation processing is also included, and the method comprises the following steps:
inputting a source signal to a preset subcarrier mapping unit to output a mapping signal;
performing inverse fast fourier transform processing on the mapping signal to output a transformed signal;
the conversion signal is input to a preset parallel-serial conversion unit to output a modulation signal.
3. The micro-LED predistortion method based on a visible light communication system according to claim 2, wherein: further comprises:
and performing cyclic prefix adding processing on the converted signal when the converted signal is in the parallel-serial conversion unit.
4. The micro-LED predistortion method based on a visible light communication system according to claim 1, wherein: further comprises:
after the photoelectric receiving device receives the optical signal, the optical signal is input into a preset amplifying and filtering unit for amplifying and filtering treatment, and the optical signal after the treatment is output for analog-to-digital conversion.
5. A micro-LED predistortion system based on a visible light communication system, comprising:
the acquisition module is used for acquiring a source signal;
the processing module is connected with the acquisition module and used for storing and processing information;
the processing module carries out modulation processing on the source signal to obtain a modulation signal, and carries out digital-to-analog conversion processing on the modulation signal to output a driving signal;
the processing module controls the preset direct current bias unit to output a preset direct current signal when the driving signal is acquired, and controls the preset micro-LED to output an optical signal according to the driving signal and the preset direct current signal;
the processing module controls the preset photoelectric receiving equipment to receive the optical signal, and performs analog-to-digital conversion processing on the optical signal to output a converted signal;
the processing module determines an estimated signal according to the converted signal and determines a model parameter value according to the estimated signal and the source signal;
the processing module inputs the model parameter value into a preset predistortion unit to realize predistortion processing.
6. An intelligent terminal comprising a memory and a processor, the memory having stored thereon a computer program capable of being loaded by the processor and performing the method according to any of claims 1 to 4.
7. A computer readable storage medium, characterized in that a computer program is stored which can be loaded by a processor and which performs the method according to any of claims 1 to 4.
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