A real-time compensation remote radio filtering system

Abstract

The present invention relates to the field of radio filtering technology, and in particular to a real-time compensation remote radio filtering system, comprising the following modules: a signal receiving module; a signal detection module, comprising: a spectrum analysis unit, a multipath interference detection unit and a frequency drift detection unit; a real-time compensation module, which comprehensively analyzes and generates a comprehensive compensation signal; a filter control module, which adjusts the filter parameters according to the compensation signal; a data transmission module, which transmits the adjusted filter parameters to a remote control terminal; a remote control module, which receives and processes control instructions from the remote control terminal; and a signal output module. The present invention can achieve accurate compensation for various interferences and drifts through the coordinated work of various detection units, ensure the stability and quality of the signal, and maintain efficient operation even in a complex communication environment.

Description

Technical Field

[0001] The invention relates to the technical field of radio filtering, and in particular to a real-time compensation remote radio filtering system. Background Art

[0002] With the rapid development of radio communication technology, radio filters play a vital role in modern communication systems. Radio filters are mainly used to selectively pass or block signals of certain frequencies, thereby improving the performance and signal quality of communication systems. However, radio filters in the prior art generally have problems such as unstable frequency response, large compensation delay, and high difficulty in remote control, which seriously affect the efficiency and reliability of communication systems.

[0003] In a complex communication environment, frequency deviation, multipath interference and frequency drift are the main interference factors. Frequency deviation causes the frequency components of the signal to shift, affecting the accurate transmission of the signal; multipath interference is caused by the signal reaching the receiving end through multiple paths, resulting in signal delay and phase changes, and even signal distortion in severe cases; frequency drift is obvious in long-distance transmission. As time and environment change, the signal frequency gradually deviates from the original frequency, affecting the stability and consistency of the signal.

[0004] Existing filtering systems can usually only deal with a single type of interference and cannot comprehensively solve the problems of frequency deviation, multipath interference and frequency drift. The real-time compensation of multipath interference by the existing filtering system is not comprehensive enough and cannot effectively deal with various complex scenarios; there are still deficiencies in the real-time compensation of frequency drift, and it is difficult to completely eliminate the impact of frequency drift. In addition, the existing filtering system lacks flexible remote control capabilities and cannot adjust the filtering parameters in real time according to actual needs, which limits the adaptability and flexibility of the system. Summary of the invention

[0005] Based on the above objectives, the present invention provides a real-time compensation remote radio filtering system.

[0006] A real-time compensation remote radio filtering system includes the following modules:

[0007] A signal receiving module, used for receiving an input radio signal;

[0008] The signal detection module is used to detect the frequency characteristics of the received signal, identify the multipath interference components and frequency drift in the received signal, and specifically includes:

[0009] A spectrum analysis unit performs spectrum analysis on the received digital signal to obtain frequency distribution characteristics;

[0010] A multipath interference detection unit, which identifies multipath interference components in a received signal;

[0011] A frequency drift detection unit, for detecting the frequency drift of a received signal;

[0012] The real-time compensation module comprehensively analyzes and generates a comprehensive compensation signal based on the detection results of the frequency distribution characteristics, multipath interference components and frequency drift in the signal detection module;

[0013] A filter control module, connected to the real-time compensation module, and adjusting filter parameters according to the compensation signal;

[0014] A data transmission module, connected to the filter control module, transmitting the adjusted filter parameters to the remote control terminal;

[0015] A remote control module, connected to the data transmission module, for receiving and processing control instructions from a remote control terminal;

[0016] The signal output module is connected to the filter control module and is used to output the adjusted radio signal.

[0017] Optionally, the signal receiving module further includes:

[0018] a receiving antenna for receiving radio signals;

[0019] The front-end amplifier performs preliminary amplification on the received radio signal to increase the signal strength;

[0020] The analog-to-digital converter converts the analog signal into a digital signal to facilitate processing by the subsequent signal detection module.

[0021] Optionally, the spectrum analysis unit specifically includes:

[0022] For input digital signals Perform fast Fourier transform to get the spectrum ,Right now:

[0023] ,in;

[0024] It is The digital signal of the sampling points, is the spectrum result, is the total number of sampling points, is the frequency, is an imaginary unit;

[0025] Spectrum The amplitude and phase are used to determine the frequency characteristics of the signal, the amplitude spectrum Indicates the intensity of the signal at each frequency component, phase spectrum Indicates the phase of the signal at each frequency component.

[0026] Optionally, the multipath interference detection unit specifically includes:

[0027] For receiving signal Calculate the autocorrelation function. Indicates that the signal is delayed at different times The correlation under is expressed as:

[0028] ,in;

[0029] is the autocorrelation function, It is The digital signal of the sampling points, It is a time delay After The complex conjugate of the digital signal at each sampling point, is the time delay, is the total number of sampling points;

[0030] Then, find the autocorrelation function The peak position of each peak Indicates the delay of a multipath component, the peak amplitude Indicates the strength of the path, and builds a multipath interference signal model based on the delay and strength information.

[0031] Optionally, the frequency drift detection unit specifically includes:

[0032] Perform short-time Fourier transform on the received signal and analyze the change of the signal frequency over time, which is expressed as:

[0033] ,in;

[0034] is the short-time Fourier transform spectrum, It is The digital signal of the sampling points, is a window function, is the short-time Fourier transform window length, is the frequency index, is the time index, is an imaginary unit;

[0035] By analyzing the frequency spectrum of the short-time Fourier transform The peak position of the frequency drift is determined :

[0036] ,in;

[0037] is the frequency drift, is the spectrum peak position, is the sampling frequency, is the window length of the short-time Fourier transform;

[0038] The frequency drift signal model is: ,in;

[0039] is the frequency drift compensation signal, is the detected frequency drift, It's time. Is an imaginary unit.

[0040] Optionally, the multipath interference signal model is expressed as:

[0041] ,in;

[0042] is a multipath interference signal, indicating that The total interference signal under It is The attenuation coefficient of each path is It is The delay of each path, is the Dirac function, which means that The impulse response at is the time delay in the autocorrelation function calculation and is a variable representing the time elapsed from the start of signal reception.

[0043] Optionally, the real-time compensation module specifically includes:

[0044] A. Frequency distribution characteristic compensation: for spectrum Perform inverse fast Fourier transform to obtain the corrected component of the time domain signal : ,

[0045] in, is the spectrum result;

[0046] Calculate frequency response compensation signal : ,

[0047] in, is the preset frequency compensation filter response;

[0048] B. Multipath interference component compensation: Based on the multipath interference signal model, calculate the interference compensation signal :

[0049] ,

[0050] in, The signal is delayed The value at

[0051] C. Frequency drift compensation: According to the frequency drift detection results , calculate the frequency drift compensation signal :

[0052] ,

[0053] in, is the received signal at the current moment, is the detected frequency drift, It’s time;

[0054] D. Comprehensive compensation signal generation: The frequency response compensation signal , Multipath Interference Compensation Signal and frequency drift compensation signal Superposition is performed to generate the final comprehensive compensation signal : ;

[0055] Optionally, for each multipath component, according to the delay Adjust the signal The timing of The signal value at , therefore, the signal is delayed The value at The calculation of is through the shift of discrete signals, expressed as:

[0056] ,

[0057] in, It is a delay The signal value at It is The delay of each path, is the sampling frequency, is a time index.

[0058] Optionally, the filtering control module specifically includes:

[0059] Get the comprehensive compensation signal from the real-time compensation module ;

[0060] right Perform fast Fourier transform and get ;

[0061] analyze The amplitude and phase of the main frequency component are determined;

[0062] According to the analysis results, adjust the center frequency of the filter ,bandwidth and gain ;

[0063] Update filter frequency response , to achieve signal compensation.

[0064] Optionally, the signal output module further includes:

[0065] A signal amplifying unit, which amplifies the adjusted radio signal;

[0066] The signal sending unit sends the optimized signal to the target receiving end.

[0067] Beneficial effects of the present invention:

[0068] The present invention detects and analyzes the frequency distribution characteristics, multipath interference components and frequency drift of the received signal respectively through a spectrum analysis unit, a multipath interference detection unit and a frequency drift detection unit. The spectrum analysis unit can accurately obtain the frequency characteristics of the signal, including the amplitude and phase information of the frequency component, to help identify and compensate for the frequency deviation. The multipath interference detection unit can detect the multipath effect in the signal, identify the delay and strength of multiple signal paths through autocorrelation function analysis, and thus generate a multipath interference compensation signal. The frequency drift detection unit can detect and compensate for the frequency drift generated by the signal during long-distance transmission. Through the coordinated work of these detection units, accurate compensation for various interferences and drifts can be achieved, ensuring the stability and quality of the signal, and maintaining efficient operation even in a complex communication environment.

[0069] The present invention, the compensation module generates a corresponding compensation signal according to the results of spectrum analysis, multipath interference detection and frequency drift detection. First, the frequency distribution characteristics obtained by spectrum analysis are converted into time domain signals through inverse fast Fourier transform to generate a frequency response compensation signal. Then, multipath interference is identified through autocorrelation function analysis to generate a multipath interference compensation signal. Finally, frequency drift is detected through short-time Fourier transform to generate a frequency drift compensation signal. The above-mentioned compensation signals are comprehensively analyzed to generate a final comprehensive compensation signal. The comprehensive compensation signal includes the comprehensive processing results of frequency deviation, multipath interference and frequency drift, and can adjust the filter parameters in real time to ensure that the filter can dynamically respond to and compensate for various signal deviations and interferences, and significantly improve the anti-interference ability of the system and the signal transmission quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0071] Figure 1 A schematic diagram of system logic of an embodiment of the present invention;

[0072] Figure 2 Schematic diagram of functional modules of an embodiment of the present invention. DETAILED DESCRIPTION

[0073] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0074] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0075] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0076] like Figure 1-Figure 2 As shown, a real-time compensation remote radio filtering system includes the following modules:

[0077] A signal receiving module, used for receiving an input radio signal;

[0078] The signal detection module is used to detect the frequency characteristics of the received signal, identify the multipath interference components and frequency drift in the received signal, and specifically includes:

[0079] A spectrum analysis unit performs spectrum analysis on the received digital signal to obtain frequency distribution characteristics;

[0080] A multipath interference detection unit, which identifies multipath interference components in a received signal;

[0081] A frequency drift detection unit, for detecting the frequency drift of a received signal;

[0082] In complex communication environments, multipath interference (i.e., signals reach the receiving end through multiple paths, causing signal distortion) is a common problem. Real-time compensation for multipath interference is currently not comprehensive enough to effectively cope with various complex scenarios. Frequency drift is obvious in long-distance transmission, and the current compensation system still has deficiencies in accurate real-time compensation of frequency drift, making it difficult to completely eliminate the impact of frequency drift.

[0083] The real-time compensation module comprehensively analyzes and generates a comprehensive compensation signal based on the detection results of the frequency distribution characteristics, multipath interference components and frequency drift in the signal detection module;

[0084] A filter control module is connected to the real-time compensation module and adjusts the filter parameters according to the compensation signal;

[0085] A data transmission module, connected to the filter control module, transmits the adjusted filter parameters to the remote control terminal;

[0086] A remote control module, connected to the data transmission module, for receiving and processing control instructions from a remote control terminal;

[0087] The signal output module is connected to the filter control module and is used for outputting the adjusted radio signal.

[0088] The signal receiving module also includes:

[0089] a receiving antenna for receiving radio signals;

[0090] The front-end amplifier performs preliminary amplification on the received radio signal to increase the signal strength;

[0091] The analog-to-digital converter converts the analog signal into a digital signal to facilitate processing by the subsequent signal detection module.

[0092] in;

[0093] The radio signal captured by the receiving antenna is , the front-end amplifier is The output signal is amplified. , the magnification factor is ,Right now:

[0094] ;

[0095] The analog-to-digital converter converts the analog signal Convert to digital signal , assuming the sampling frequency is ,but exist The sampling value at the time.

[0096] The spectrum analysis unit specifically includes:

[0097] For input digital signals Perform fast Fourier transform to get the spectrum ,Right now:

[0098] ,in;

[0099] It is The digital signal of the sampling points, is the spectrum result, is the total number of sampling points, is the frequency, is an imaginary unit;

[0100] Spectrum The amplitude and phase are used to determine the frequency characteristics of the signal, the amplitude spectrum Indicates the intensity of the signal at each frequency component, phase spectrum Indicates the phase of the signal at each frequency component.

[0101] The multipath interference detection unit specifically includes:

[0102] For receiving signal Calculate the autocorrelation function. Indicates that the signal is delayed at different times The correlation under is expressed as:

[0103] ,in;

[0104] is the autocorrelation function, It is The digital signal of the sampling points, It is a time delay After The complex conjugate of the digital signal at each sampling point, is the time delay, is the total number of sampling points, and the autocorrelation function is obtained by traversing all time delays. , calculate the signal and its delayed version similarities between;

[0105] Then, find the autocorrelation function The peak position of each peak Indicates the delay of a multipath component, the peak amplitude Indicates the strength of the path, and builds a multipath interference signal model based on the delay and strength information.

[0106] The frequency drift detection unit specifically includes:

[0107] Perform short-time Fourier transform on the received signal and analyze the change of the signal frequency over time, which is expressed as:

[0108] ,in;

[0109] is the short-time Fourier transform spectrum, It is The digital signal of the sampling points, is a window function, is the short-time Fourier transform window length, is the frequency index, is the time index, is an imaginary unit;

[0110] By analyzing the frequency spectrum of the short-time Fourier transform The peak position of the frequency drift is determined , let the peak position be , then the frequency drift :

[0111] ,in;

[0112] is the frequency drift, is the spectrum peak position, is the sampling frequency, is the window length of the short-time Fourier transform;

[0113] The frequency drift signal model is: ,in;

[0114] is the frequency drift compensation signal, is the detected frequency drift, It's time. Is an imaginary unit.

[0115] The components of multipath interference are expressed as a combination of several delays and intensities. The multipath interference signal model is expressed as:

[0116] ,in;

[0117] is a multipath interference signal, indicating that The total interference signal under It is The attenuation coefficient of each path is It is The delay of each path, is the Dirac function, which means that The impulse response at is the time delay in the autocorrelation function calculation and is a variable representing the time elapsed from the start of signal reception.

[0118] The real-time compensation module specifically includes:

[0119] A. Frequency distribution characteristic compensation: for spectrum Perform inverse fast Fourier transform to obtain the corrected component of the time domain signal : ,

[0120] in, is the spectrum result;

[0121] Calculate frequency response compensation signal : ,

[0122] in, is the preset frequency compensation filter response;

[0123] B. Multipath interference component compensation: Based on the multipath interference signal model, calculate the interference compensation signal :

[0124] ,

[0125] in, The signal is delayed The value at

[0126] C. Frequency drift compensation: According to the frequency drift detection results , calculate the frequency drift compensation signal :

[0127] ,

[0128] in, is the received signal at the current moment, is the detected frequency drift, It’s time;

[0129] D. Comprehensive compensation signal generation: The frequency response compensation signal , Multipath Interference Compensation Signal and frequency drift compensation signal Superposition is performed to generate the final comprehensive compensation signal : ;

[0130] The compensation algorithm unit generates a comprehensive compensation signal through the above steps , which is used to compensate for frequency distribution characteristics, multipath interference components and frequency drift, thereby optimizing filter performance and signal quality.

[0131] Spectrum Perform inverse fast Fourier transform to obtain the corrected component of the time domain signal The details are as follows:

[0132] Spectrum Perform inverse fast Fourier transform to obtain the corrected component of the time domain signal , expressed as:

[0133] ,in;

[0134] It is The time domain signal of sampling points is is the number of points of the inverse fast Fourier transform, The spectrum is frequency components, is an imaginary unit, is the frequency index, is a time index.

[0135] For each multipath component, according to the delay Adjust the signal The timing of The signal value at Therefore, the signal is delayed The value at The calculation of is through the shift of discrete signals, expressed as:

[0136] ,

[0137] in, It is a delay The signal value at It is The delay of each path, is the sampling frequency, is a time index.

[0138] The filter control module receives the comprehensive compensation signal , analyze the comprehensive compensation signal The spectrum characteristics of the spectrum are obtained again through fast Fourier transform :

[0139] ,

[0140] in, is the comprehensive compensation signal, is the spectrum of the integrated compensation signal, is the Fast Fourier Transform;

[0141] According to the spectrum of the comprehensive compensation signal The characteristics of the filter parameters are determined to determine the required adjustment amount, that is, to calculate the spectrum of the comprehensive compensation signal. The main frequency component and amplitude in the filter are used to determine the center frequency of the filter. ,bandwidth and gain Parameter adjustment value; based on center frequency ,bandwidth and gain Parameters are used to compensate for the signal. The filter parameters are adjusted to compensate for various interferences and frequency drifts in the comprehensive compensation signal. The adjustment formula is:

[0142] ,

[0143] in, is the frequency response of the filter, is the gain of the filter, is the center frequency of the filter, is the bandwidth of the filter, It's the frequency.

[0144] Calculating the spectrum The main frequency components and amplitudes in are as follows:

[0145] Calculate the spectrum amplitude and Phase :

[0146] ;

[0147] ;

[0148] in, and They are The real and imaginary parts of the filter are used to determine the center frequency of the filter based on the spectrum analysis results. ,bandwidth and gain parameter:

[0149] Center frequency : Spectrum The main frequency component position of

[0150] bandwidth : The width of the main frequency component, determined by the frequency difference at the half-power point (3dB);

[0151] Gain : Determined by the required compensation amount and signal strength.

[0152] The signal output module also includes:

[0153] A signal amplifying unit, which amplifies the adjusted radio signal;

[0154] The signal sending unit sends the optimized signal to the target receiving end; if necessary, the optimized signal is first converted into an analog signal and then transmitted through the antenna.

[0155] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0156] The above is only 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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A real-time compensation remote radio filtering system, characterized in that: Includes the following modules: A signal receiving module, used for receiving an input radio signal; The signal detection module is used to detect the frequency characteristics of the received signal, identify the multipath interference components and frequency drift in the received signal, and specifically includes: A spectrum analysis unit performs spectrum analysis on the received digital signal to obtain frequency distribution characteristics; A multipath interference detection unit, which identifies multipath interference components in a received signal; A frequency drift detection unit, for detecting the frequency drift of a received signal; The real-time compensation module comprehensively analyzes and generates a comprehensive compensation signal based on the detection results of the frequency distribution characteristics, multipath interference components and frequency drift in the signal detection module, specifically including: A. Frequency distribution characteristic compensation: for spectrum Perform inverse fast Fourier transform to obtain the corrected component of the time domain signal : ,in, is the spectrum result; Calculate frequency response compensation signal : , in, is the preset frequency compensation filter response; B. Multipath interference component compensation: Based on the multipath interference signal model, calculate the multipath interference compensation signal : ， in, The signal is delayed The value at which It is The attenuation coefficient of each path is It is The delay of each path; C. Frequency drift compensation: According to the frequency drift detection results , calculate the frequency drift compensation signal : ， in, is the received signal at the current moment, is the detected frequency drift, It’s time; D. Comprehensive compensation signal generation: The frequency response compensation signal , Multipath Interference Compensation Signal and frequency drift compensation signal Superposition is performed to generate the final comprehensive compensation signal : ; A filter control module, connected to the real-time compensation module, and adjusting filter parameters according to the compensation signal; A data transmission module, connected to the filter control module, transmitting the adjusted filter parameters to the remote control terminal; A remote control module, connected to the data transmission module, for receiving and processing control instructions from a remote control terminal; The signal output module is connected to the filter control module and is used to output the adjusted radio signal.

2. A real-time compensation remote radio filtering system according to claim 1, characterized in that: The signal receiving module also includes: a receiving antenna for receiving radio signals; The front-end amplifier performs preliminary amplification on the received radio signal to increase the signal strength; The analog-to-digital converter converts the analog signal into a digital signal to facilitate processing by the subsequent signal detection module.

3. A real-time compensation remote radio filtering system according to claim 1, characterized in that: The spectrum analysis unit specifically includes: For input digital signals Perform fast Fourier transform to get the spectrum ,Right now: ,in; It is The digital signal of the sampling points, is the spectrum result, is the total number of sampling points, is the frequency, is an imaginary unit; Spectrum The amplitude and phase are used to determine the frequency characteristics of the signal, the amplitude spectrum Indicates the intensity of the signal at each frequency component, phase spectrum Indicates the phase of the signal at each frequency component.

4. A real-time compensation remote radio filtering system according to claim 3, characterized in that: The multipath interference detection unit specifically includes: For receiving signal Calculate the autocorrelation function. Indicates that the signal is delayed at different times The correlation under is expressed as: ,in; is the autocorrelation function, It is The digital signal of the sampling points, It is a time delay After The complex conjugate of the digital signal at each sampling point, is the time delay, is the total number of sampling points; Find the autocorrelation function The peak position of each peak Indicates the delay of a multipath component, the peak amplitude Indicates the strength of the path, and builds a multipath interference signal model based on the delay and strength information.

5. A real-time compensation remote radio filtering system according to claim 4, characterized in that: The frequency drift detection unit specifically includes: Perform short-time Fourier transform on the received signal and analyze the change of the signal frequency over time, which is expressed as: ,in; is the short-time Fourier transform spectrum, It is The digital signal of the sampling points, is a window function, is the short-time Fourier transform window length, is the frequency index, is the time index, is an imaginary unit; By analyzing the frequency spectrum of the short-time Fourier transform The peak position of the frequency drift is determined : ,in; is the frequency drift, is the spectrum peak position, is the sampling frequency, is the window length of the short-time Fourier transform; The frequency drift signal model is: ,in; is the frequency drift compensation signal, is the detected frequency drift, It's time. Is an imaginary unit.

6. A real-time compensation remote radio filtering system according to claim 5, characterized in that: The multipath interference signal model is expressed as: ,in; Multipath interference signal, It is The attenuation coefficient of each path is It is The delay of each path, is the Dirac function, which means that The impulse response at is the time delay in the calculation of the autocorrelation function.

7. A real-time compensation remote radio filtering system according to claim 1, characterized in that: The signal is delayed The value at The calculation of is through the shift of discrete signals, expressed as: ,in, It is a delay The signal value at It is The delay of each path, is the sampling frequency, is a time index.

8. A real-time compensation remote radio filtering system according to claim 1, characterized in that: The filtering control module specifically includes: Get the comprehensive compensation signal from the real-time compensation module ; right Perform fast Fourier transform and get ; analyze The amplitude and phase of the main frequency component are determined; According to the analysis results, adjust the center frequency of the filter ,bandwidth and gain ; Update filter frequency response , to achieve signal compensation.

9. A real-time compensation remote radio filtering system according to claim 1, characterized in that: The signal output module also includes: A signal amplifying unit, which amplifies the adjusted radio signal; The signal sending unit sends the optimized signal to the target receiving end.

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