Mixed signal non-interference transmission method, system, equipment and medium

Abstract

The invention discloses a mixed signal interference-free transmission method, system, equipment and medium, and the method comprises the steps: firstly carrying out the spectrum analysis of a collected mixed signal through employing fast Fourier transform, obtaining a spectrum result, extracting a frequency set of a carrier signal and a power frequency signal in the mixed signal based on the spectrum result, and carrying out the frequency collection of the carrier signal and the power frequency signal in the mixed signal; based on the frequency set, separating the mixed signal by using a blind source separation algorithm to obtain a separated signal; wherein the separation signal comprises a carrier signal component and a power frequency signal component, finally, modulating the carrier signal component by adopting an orthogonal frequency division multiplexing technology according to the separation signal to obtain a plurality of modulation signals, and combining the plurality of modulation signals to form a composite signal for transmission. According to the invention, high-efficiency separation of mixed signals can be realized, and reliability and transmission efficiency of power line communication are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power line communications, and in particular to a method, system, device and medium for interference-free transmission of mixed signals. Background Art

[0002] With the development of smart grids and the Internet of Things (IoT), power line communication (PLC) technology is gaining increasing attention as a key data transmission method. PLC channels utilize existing power lines for information transmission, offering advantages such as low construction costs and wide coverage. However, because PLC channels carry both power and data signals, interference and signal attenuation can occur during transmission. This interference not only affects data transmission stability but can also lead to information loss or miscommunication.

[0003] Traditional spectrum analysis methods (such as discrete Fourier transforms) have limited accuracy in identifying the frequency components of complex mixed signals, making it difficult to accurately distinguish between carrier signals and power frequency signals. Furthermore, they lack effective blind source separation mechanisms, making it difficult to eliminate the aliasing interference between the two types of signals in the frequency and time domains. Existing technologies typically use a single carrier or simple modulation scheme during signal transmission, making it difficult to effectively address the interference between carrier and power frequency signals in mixed signals, resulting in low reliability and transmission efficiency of power line communication. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, system, device and medium for interference-free transmission of mixed signals, so as to achieve efficient separation of mixed signals and improve the reliability and transmission efficiency of power line communication.

[0005] To achieve the above objectives, the present invention provides a method for transmitting mixed signals without interference, comprising:

[0006] The collected mixed signal is subjected to spectrum analysis using fast Fourier transform to obtain spectrum results;

[0007] Extracting a frequency set of a carrier signal and a power frequency signal from the mixed signal based on the spectrum result;

[0008] Based on the frequency set, a blind source separation algorithm is used to separate the mixed signal to obtain a separated signal; wherein the separated signal includes a carrier signal component and an industrial frequency signal component;

[0009] According to the separated signal, the carrier signal component is modulated using orthogonal frequency division multiplexing technology to obtain multiple modulated signals, and the multiple modulated signals are combined to form a composite signal for transmission.

[0010] Optionally, the separating the mixed signal based on the frequency set by using a blind source separation algorithm to obtain a separated signal includes:

[0011] The mixed signal is separated by a blind source separation algorithm, and the separated signal is calculated by the following formula:

[0012]

[0013] Where S(t) represents the separated signal at time t, A n Indicates the amplitude of the nth independent signal (carrier signal or power frequency signal) after separation, w n represents the angular frequency of the nth independent signal, w n =2πf n , Φ(w) represents the normalized spectrum function.

[0014] Optionally, modulating the carrier signal component using orthogonal frequency division multiplexing technology according to the separated signal to obtain multiple modulated signals, and combining the multiple modulated signals to form a composite signal for transmission includes:

[0015] selecting a plurality of orthogonal subcarrier frequencies based on the spectrum of the separated signal, setting an amplitude for each carrier signal component based on the energy distribution of the separated signal, and extracting an initial phase of each carrier signal component from phase information of the separated signal;

[0016] generating a plurality of modulated signals according to the selected plurality of orthogonal subcarrier frequencies, the set amplitudes and the extracted initial phases;

[0017] The multiple modulated signals are normalized to obtain multiple normalized modulated signals, and the multiple normalized modulated signals are combined to form a composite signal for transmission.

[0018] Optionally, after generating multiple modulation signals according to the selected multiple orthogonal subcarrier frequencies, the set amplitudes and the extracted initial phases, the method further includes:

[0019] If a phase error between an actual phase of the modulation signal and a reference phase is less than a first preset threshold, generating a plurality of modulation signals according to the currently selected plurality of orthogonal subcarrier frequencies;

[0020] If the phase error between the actual phase of the modulated signal and the reference phase is greater than a second preset threshold, reselecting multiple orthogonal subcarrier frequencies to regenerate multiple modulated signals;

[0021] If the phase error between the actual phase of the modulated signal and the reference phase is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the currently selected multiple orthogonal subcarrier frequencies are adjusted to regenerate multiple modulated signals.

[0022] Optionally, the first preset threshold is 5° to 8°, and the second preset threshold is 15° to 20°.

[0023] Optionally, extracting a frequency set of a carrier signal and a power frequency signal in the mixed signal based on the spectrum result includes:

[0024] The frequencies whose amplitudes exceed a preset amplitude threshold value in the spectrum result are extracted to obtain a frequency set of the carrier signal and the power frequency signal in the mixed signal.

[0025] Optionally, before performing spectrum analysis on the collected mixed signal by using fast Fourier transform to obtain a spectrum result, the method further includes:

[0026] The collected mixed signal is preprocessed; wherein the preprocessing includes denoising or noise reduction processing of the mixed signal.

[0027] To achieve the above objectives, the present invention further provides a mixed signal interference-free transmission system, comprising:

[0028] The spectrum analysis module is used to perform spectrum analysis on the collected mixed signal using fast Fourier transform to obtain spectrum results;

[0029] A frequency extraction module, configured to extract a frequency set of a carrier signal and a power frequency signal from the mixed signal based on the spectrum result;

[0030] A signal separation module, configured to separate the mixed signal based on the frequency set using a blind source separation algorithm to obtain a separated signal; wherein the separated signal includes a carrier signal component and an industrial frequency signal component;

[0031] The signal modulation and transmission module is used to modulate the carrier signal component according to the separated signal using orthogonal frequency division multiplexing technology to obtain multiple modulation signals, and combine the multiple modulation signals to form a composite signal for transmission.

[0032] To achieve the above objectives, the present invention also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements the mixed signal interference-free transmission method as described in any one of the above items.

[0033] To achieve the above objectives, the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the mixed signal interference-free transmission method as described in any one of the above.

[0034] Compared with the existing technology, the present invention provides a mixed signal interference-free transmission method, system, equipment and medium. First, through fast Fourier transform and blind source separation algorithm, the carrier signal and the power frequency signal are effectively separated, thereby significantly reducing the interference between the signals. By utilizing the multi-carrier modulation scheme, the stability and reliability of signal transmission can be guaranteed in a complex power line environment; and through optimized signal combination and modulation method, the information loss during the transmission process is minimized, thereby improving the efficiency of data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings used in the implementation methods. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a flow chart of a mixed signal interference-free transmission method provided by an embodiment of the present invention;

[0037] Figure 2 This is a structural block diagram of a mixed signal interference-free transmission system provided by an embodiment of the present invention;

[0038] Figure 3 This is a structural block diagram of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] See also Figure 1 , Figure 1 1 is a flow chart of a mixed signal interference-free transmission method provided by an embodiment of the present invention, wherein the mixed signal interference-free transmission method comprises steps S1 to S4:

[0041] Step S1, using fast Fourier transform to perform spectrum analysis on the collected mixed signal to obtain a spectrum result;

[0042] In an optional embodiment, before step S1, the method further includes:

[0043] Preprocessing the collected mixed signal; wherein the preprocessing includes denoising or noise reduction processing the mixed signal;

[0044] For example, after the mixed signal of the power line is collected by the sensor, the signal may first be pre-processed by a low-pass filter, including denoising and noise reduction processing, to improve the clarity of the mixed signal.

[0045] Then, the fast Fourier transform is used to perform spectrum analysis on the preprocessed mixed signal. Specifically, the expression of the fast Fourier transform for spectrum analysis of the mixed signal is:

[0046]

[0047] Among them, X(f) represents the spectrum result of the mixed signal, S f (t) represents the result of mixed signal preprocessing, t represents the time variable, j represents the imaginary unit, and f represents the frequency variable.

[0048] Step S2: extracting a frequency set of the carrier signal and the power frequency signal in the mixed signal based on the spectrum result;

[0049] Specifically, step S2 includes:

[0050] The frequencies whose amplitudes exceed a preset amplitude threshold value in the spectrum result are extracted to obtain a frequency set of the carrier signal and the power frequency signal in the mixed signal.

[0051] For example, the amplitude threshold is set to θ, and the frequency whose amplitude exceeds the threshold is selected, which is expressed as:

[0052] {f n}={f||X(f)|>θ};

[0053] Among them, {f n} is the frequency set of the extracted carrier signal and power frequency signal, |X(f)| represents the amplitude of the spectrum at frequency f, and θ is the set amplitude threshold.

[0054] Step S3: Based on the frequency set, a blind source separation algorithm is used to separate the mixed signal to obtain a separated signal; wherein the separated signal includes a carrier signal component and an industrial frequency signal component;

[0055] Specifically, the mixed signal is separated by a blind source separation algorithm, and the separated signal is calculated by the following formula:

[0056]

[0057] Where S(t) represents the separated signal at time t, A n Indicates the amplitude of the nth independent signal (carrier signal or power frequency signal) after separation, w n represents the angular frequency of the nth independent signal, w n =2πf n , Φ(w) represents the normalized spectrum function.

[0058] Specifically, the expression of the normalized spectrum function is:

[0059]

[0060] Where F(w) represents the energy of the spectrum at frequency w.

[0061] It should be noted that the separated signal S(t) does not refer to the separation of carrier and power frequency, but the set obtained by non-interference extraction of the original independent signal source, which contains multiple independent source signal components including carrier signal and power frequency signal. The S(t) calculated in the formula is actually all the source signal components obtained after blind source separation, that is:

[0062] S(t)=[S1(t),S2(t),...,Si(t)];

[0063] Each Si(t) is a signal source with independent frequency characteristics, and spectrum analysis can be used to identify which component corresponds to the power frequency signal (such as 50 Hz) or the carrier signal.

[0064] It is worth noting that the embodiment of the present invention first removes background noise through a low-pass filter to obtain a filtered signal. The signal is then converted to the frequency domain using a fast Fourier transform (FFT) to obtain a spectrum. On this basis, an amplitude threshold is set to extract key frequency components. Finally, a blind source separation algorithm is used to calculate the separated signal, combining the normalized spectrum function and the frequency components. This process ensures signal clarity and accuracy, laying a solid foundation for subsequent carrier modulation schemes.

[0065] Step S4: According to the separated signal, the carrier signal component is modulated using orthogonal frequency division multiplexing technology to obtain multiple modulated signals, and the multiple modulated signals are combined to form a composite signal for transmission.

[0066] Specifically, step S4 includes:

[0067] S401, select multiple appropriate orthogonal subcarrier frequencies {w k}, set the amplitude B for each of the carrier signal components based on the energy distribution of the separated signal S(t) k , extract the initial phase of each carrier signal component from the phase information of the separated signal S(t)

[0068] S402: Generate multiple modulation signals according to the selected multiple orthogonal subcarrier frequencies, the set amplitudes, and the extracted initial phases using the following formula:

[0069]

[0070] Among them, S m (t) is the modulated signal generated at time t, M represents the number of selected carrier frequencies, and k is an index variable used to identify the carrier signal currently being processed;

[0071] S403, normalize the multiple modulated signals to obtain multiple normalized modulated signals S n (t):

[0072]

[0073] It is worth noting that the purpose of normalizing the modulated signal is to ensure that the amplitude of the signal is within an acceptable range.

[0074] Then, the multiple normalized modulated signals are combined to form a composite signal S c (t):

[0075]

[0076] Among them, θ k Indicates the dynamically adjusted phase;

[0077] Finally, the composite signal is transmitted, and the expression process is:

[0078] S final =E[S c (t)];

[0079] Among them, S final represents the final output, and E[·] represents the encoding or modulation process. Here, E[·] can be generally understood as mapping the digital signal to the carrier during the modulation process. For example, each binary bit can correspond to a different amplitude or phase.

[0080] In an optional embodiment, after step S402, the method further includes:

[0081] If a phase error between an actual phase of the modulation signal and a reference phase is less than a first preset threshold, generating a plurality of modulation signals according to the currently selected plurality of orthogonal subcarrier frequencies;

[0082] If the phase error between the actual phase of the modulated signal and the reference phase is greater than a second preset threshold, reselecting multiple orthogonal subcarrier frequencies to regenerate multiple modulated signals;

[0083] If the phase error between the actual phase of the modulated signal and the reference phase is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the currently selected multiple orthogonal subcarrier frequencies are adjusted to regenerate multiple modulated signals.

[0084] For example, if the phase error between the actual phase of the modulated signal and the reference phase is less than threshold P1, the modulated signal quality is determined to be high, and the current multi-carrier modulation scheme continues; if the phase error is greater than threshold P2, the modulated signal quality is determined to be low, and the selected carrier frequency needs to be re-evaluated; if the phase error is between P1 and P2, the modulated signal quality is determined to be medium, and the carrier parameters need to be carefully adjusted to ensure signal stability. Generally speaking, the high-quality limit indicates the maximum phase error that a high-quality signal can tolerate. Preferably, the recommended value for P1 is 5° to 8°; the low-quality limit indicates that exceeding this value indicates that intervention is required. The recommended value for P2 is 15° to 20°.

[0085] In summary, the embodiment of the present invention provides a mixed signal interference-free transmission method, which first realizes the effective separation of carrier signals (data transmission) and industrial frequency signals (power transmission) through fast Fourier transform and blind source separation algorithm, thereby significantly reducing the interference between signals, and utilizes a multi-carrier modulation scheme to ensure the stability and reliability of signal transmission in a complex power line environment; and through optimized signal combination and modulation methods, the information loss during the transmission process is minimized, thereby improving the efficiency of data transmission, being able to adapt to different power line environments, having strong flexibility and adaptability, and being suitable for wide application in fields such as smart grids and the Internet of Things.

[0086] Based on the above method items, the present invention provides corresponding embodiments of the system items.

[0087] See also Figure 2 , Figure 2 : This is a block diagram of a mixed signal interference-free transmission system provided by an embodiment of the present invention. The mixed signal interference-free transmission system includes:

[0088] The spectrum analysis module 21 is used to perform spectrum analysis on the collected mixed signal using fast Fourier transform to obtain a spectrum result;

[0089] A frequency extraction module 22 is configured to extract a frequency set of the carrier signal and the power frequency signal in the mixed signal based on the spectrum result;

[0090] A signal separation module 23 is configured to separate the mixed signal based on the frequency set using a blind source separation algorithm to obtain a separated signal; wherein the separated signal includes a carrier signal component and an industrial frequency signal component;

[0091] The signal modulation and transmission module 24 is used to modulate the carrier signal component according to the separated signal using orthogonal frequency division multiplexing technology to obtain multiple modulated signals, and combine the multiple modulated signals to form a composite signal for transmission.

[0092] In an optional embodiment, the mixed signal interference-free transmission system further includes a signal preprocessing unit configured to:

[0093] The collected mixed signal is preprocessed; wherein the preprocessing includes denoising or noise reduction processing of the mixed signal.

[0094] In an optional embodiment, the frequency extraction module 22 is specifically configured to:

[0095] The frequencies whose amplitudes exceed a preset amplitude threshold value in the spectrum result are extracted to obtain a frequency set of the carrier signal and the power frequency signal in the mixed signal.

[0096] In an optional embodiment, the signal separation module 23 is specifically configured to:

[0097] The mixed signal is separated by a blind source separation algorithm, and the separated signal is calculated by the following formula:

[0098]

[0099] Where S(t) represents the separated signal at time t, A n Indicates the amplitude of the nth independent signal (carrier signal or power frequency signal) after separation, w n represents the angular frequency of the nth independent signal, w n =2πf n , Φ(w) represents the normalized spectrum function.

[0100] In an optional embodiment, the signal separation module 23 includes:

[0101] a parameter selection unit, configured to select a plurality of orthogonal subcarrier frequencies based on the spectrum of the separated signal, set an amplitude for each carrier signal component based on the energy distribution of the separated signal, and extract an initial phase of each carrier signal component from the phase information of the separated signal;

[0102] a modulation unit, configured to generate a plurality of modulation signals according to the selected plurality of orthogonal subcarrier frequencies, the set amplitudes and the extracted initial phases;

[0103] The transmission unit is used to normalize the multiple modulated signals to obtain multiple normalized modulated signals, and combine the multiple normalized modulated signals to form a composite signal for transmission.

[0104] In an optional embodiment, the signal separation module 23 further includes a modulation optimization unit configured to:

[0105] If a phase error between an actual phase of the modulation signal and a reference phase is less than a first preset threshold, generating a plurality of modulation signals according to the currently selected plurality of orthogonal subcarrier frequencies;

[0106] If the phase error between the actual phase of the modulated signal and the reference phase is greater than a second preset threshold, reselecting multiple orthogonal subcarrier frequencies to regenerate multiple modulated signals;

[0107] If the phase error between the actual phase of the modulated signal and the reference phase is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the currently selected multiple orthogonal subcarrier frequencies are adjusted to regenerate multiple modulated signals.

[0108] It should be noted that the mixed signal interference-free transmission system provided in the embodiment of the present invention is used to execute all the process steps of the mixed signal interference-free transmission method in the above embodiment. The working principles and beneficial effects of the two correspond one to one, and thus will not be described in detail.

[0109] The embodiment of the present invention further provides a terminal device, such as Figure 3 FIG2 is a block diagram of a preferred embodiment of a terminal device provided by the present invention. The terminal device includes a processor 31, a memory 32, and a computer program stored in the memory 32 and configured to be executed by the processor 31. When the processor 31 executes the computer program, it implements the mixed signal interference-free transmission method described in any of the above embodiments.

[0110] In addition, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the mixed signal interference-free transmission method as described in any of the above embodiments.

[0111] When the processor 31 executes the computer program, the steps in the embodiment of the mixed signal interference-free transmission method are implemented, for example: Figure 1Alternatively, when the processor 31 executes the computer program, the functions of each module in the embodiment of the mixed signal non-interference transmission system are realized, for example Figure 2 The functions of each module of the mixed signal interference-free transmission system are shown.

[0112] Preferably, the computer program can be divided into one or more modules / units, which are stored in the memory 32 and executed by the processor 31 to implement the present invention. The one or more modules / units can be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0113] The processor 31 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor, or the processor 31 can be any conventional processor. The processor 31 is the control center of the terminal device, and uses various interfaces and lines to connect the various parts of the terminal device.

[0114] The memory 32 mainly includes a program storage area and a data storage area. The program storage area can store an operating system, at least one application required for a function, and the data storage area can store related data. In addition, the memory 32 can be a high-speed random access memory or a non-volatile memory such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, or a flash card. Alternatively, the memory 32 can be other volatile solid-state memory devices.

[0115] It should be noted that the above terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that Figure 3 The structural block diagram shown is only an example of the structure of the terminal device and does not constitute a structural limitation of the terminal device. The terminal device may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0116] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A mixed signal interference-free transmission method, characterized in that: include: The collected mixed signal is subjected to spectrum analysis using fast Fourier transform to obtain spectrum results; Extracting a frequency set of a carrier signal and a power frequency signal from the mixed signal based on the spectrum result; Based on the frequency set, a blind source separation algorithm is used to separate the mixed signal to obtain a separated signal; wherein the separated signal includes a carrier signal component and an industrial frequency signal component; According to the separated signal, the carrier signal component is modulated using orthogonal frequency division multiplexing technology to obtain multiple modulated signals, and the multiple modulated signals are combined to form a composite signal for transmission.

2. The method for mixed signal interference-free transmission according to claim 1, wherein: The method of separating the mixed signal based on the frequency set by using a blind source separation algorithm to obtain a separated signal includes: The mixed signal is separated by a blind source separation algorithm, and the separated signal is calculated by the following formula: Where S(t) represents the separated signal at time t, A n Indicates the amplitude of the nth independent signal (carrier signal or power frequency signal) after separation, w n represents the angular frequency of the nth independent signal, w n =2πf n , Φ(w) represents the normalized spectrum function.

3. The method for transmitting mixed signals without interference according to claim 1, wherein: The method of modulating the carrier signal component using orthogonal frequency division multiplexing technology according to the separated signal to obtain multiple modulated signals, and combining the multiple modulated signals to form a composite signal for transmission includes: selecting a plurality of orthogonal subcarrier frequencies based on the spectrum of the separated signal, setting an amplitude for each carrier signal component based on the energy distribution of the separated signal, and extracting an initial phase of each carrier signal component from phase information of the separated signal; generating a plurality of modulated signals according to the selected plurality of orthogonal subcarrier frequencies, the set amplitudes and the extracted initial phases; The multiple modulated signals are normalized to obtain multiple normalized modulated signals, and the multiple normalized modulated signals are combined to form a composite signal for transmission.

4. The method for transmitting mixed signals without interference according to claim 3, wherein: After generating a plurality of modulation signals according to the selected plurality of orthogonal subcarrier frequencies, the set amplitudes and the extracted initial phases, the method further includes: If a phase error between an actual phase of the modulation signal and a reference phase is less than a first preset threshold, generating a plurality of modulation signals according to the currently selected plurality of orthogonal subcarrier frequencies; If the phase error between the actual phase of the modulated signal and the reference phase is greater than a second preset threshold, reselecting multiple orthogonal subcarrier frequencies to regenerate multiple modulated signals; If the phase error between the actual phase of the modulated signal and the reference phase is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the currently selected multiple orthogonal subcarrier frequencies are adjusted to regenerate multiple modulated signals.

5. The method for transmitting mixed signals without interference according to claim 4, wherein: The first preset threshold is 5° to 8°, and the second preset threshold is 15° to 20°.

6. The method for mixed signal interference-free transmission according to claim 1, wherein: The extracting, based on the spectrum result, a frequency set of the carrier signal and the power frequency signal in the mixed signal includes: The frequencies whose amplitudes exceed a preset amplitude threshold value in the spectrum result are extracted to obtain a frequency set of the carrier signal and the power frequency signal in the mixed signal.

7. The method for transmitting mixed signals without interference according to claim 1, wherein: Before performing spectrum analysis on the collected mixed signal by using fast Fourier transform to obtain a spectrum result, the method further includes: The collected mixed signal is pre-processed; wherein the pre-processing includes denoising or noise reduction processing of the mixed signal.

8. A mixed signal interference-free transmission system, characterized in that: include: The spectrum analysis module is used to perform spectrum analysis on the collected mixed signal using fast Fourier transform to obtain spectrum results; A frequency extraction module, configured to extract a frequency set of a carrier signal and a power frequency signal from the mixed signal based on the spectrum result; A signal separation module, configured to separate the mixed signal based on the frequency set using a blind source separation algorithm to obtain a separated signal; wherein the separated signal includes a carrier signal component and an industrial frequency signal component; The signal modulation and transmission module is used to modulate the carrier signal component according to the separated signal using orthogonal frequency division multiplexing technology to obtain multiple modulation signals, and combine the multiple modulation signals to form a composite signal for transmission.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for mixed signal interference-free transmission according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the mixed signal interference-free transmission method according to any one of claims 1 to 7.

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