Environment carrier interference elimination method and system suitable for backscattering

Abstract

The invention discloses an environment carrier interference elimination method suitable for backscattering, which comprises the following steps: acquiring an environment signal, and carrying out carrier detection on the environment signal to obtain a carrier signal; adjusting the amplitude and the phase of the carrier signal by using an adjustable phase shifter and an attenuator to obtain an elimination signal; obtaining an interference signal, and superposing the elimination signal and the interference signal on the same channel to perform interference elimination; the intensity value of the signal after elimination is detected by the detector, the intensity value of the signal after elimination is judged according to an acceleration algorithm, attenuation and phase shift values are adjusted, the optimal signal after interference elimination is obtained, and the quality and reliability of backscatter communication are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental carrier interference, and in particular to a method and system for eliminating environmental carrier interference suitable for backscattering. Background Art

[0002] In recent years, with the development of Internet of Things technology, backscatter communication has attracted widespread attention due to its low power consumption and low cost. Backscatter communication allows devices to send information by reflecting existing radio signals instead of actively generating signals, which makes it very suitable for use in scenarios with limited or no battery power, such as environmental monitoring, smart homes, and wearable devices.

[0003] However, when using radio signals in the environment for communication, backscatter tags face serious carrier interference problems. Traditional solutions usually move scattered signals away from the frequency band where the carrier is located to avoid interference, which not only wastes spectrum resources but also makes large-scale deployment difficult. Therefore, studying a system that can eliminate carrier interference without changing the original spectrum usage is of great significance for the practical application of backscatter communication. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is: the present invention solves the problem that in the traditional solution, the scattered signal is moved away from the frequency band where the carrier is located to avoid interference, which causes a waste of spectrum resources and makes large-scale deployment difficult.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for eliminating environmental carrier interference applicable to backscattering, comprising:

[0008] Acquire an environmental signal, perform carrier detection on the environmental signal, and obtain a carrier signal;

[0009] The carrier signal is adjusted in amplitude and phase by using an adjustable phase shifter and an attenuator to obtain a cancellation signal;

[0010] Acquire an interference signal, and superimpose the cancellation signal and the interference signal on the same channel to perform interference cancellation;

[0011] The detector is used to detect the strength value of the signal after elimination, and the strength value of the signal after elimination is judged according to the acceleration algorithm and the attenuation and phase shift values ​​are adjusted to obtain the optimal signal after interference elimination.

[0012] As a preferred solution of the method for eliminating environmental carrier interference applicable to backscattering described in the present invention, the interference signal includes:

[0013] The interference signal received at the set time is the result of the signal sent by the transmitter at the set time minus the transmission delay of the interference channel being transmitted through the constant parameter channel and being affected by constant amplitude attenuation and constant time delay.

[0014] As a preferred solution of the method for eliminating environmental carrier interference applicable to backscattering described in the present invention, the elimination signal includes:

[0015] The transmitting end signal is divided by a coupler, the original signal is delayed by the same time unit as the delay of the elimination signal, the amplitude is adjusted by the amplitude attenuation factor of the elimination signal, and the phase change is introduced by the complex exponential term to obtain the elimination signal;

[0016] The signal at the receiving end is the backscattered signal plus the RF signal plus the interference signal plus the noise.

[0017] As a preferred solution of the method for eliminating environmental carrier interference applicable to backscattering described in the present invention, the interference elimination includes:

[0018] The interference cancellation capability is expressed as:

[0019]

[0020] Among them, E SI is the energy of the interference signal, E N is the noise energy, E R is the energy of the residual interference signal;

[0021] When the delay of the cancellation signal is equal to the transmission delay of the interference signal, the attenuation factor of the cancellation signal is equal to the interference attenuation factor and the phase change satisfies π, the interference cancellation capability G is the strongest.

[0022] As a preferred solution of the method for eliminating environmental carrier interference applicable to backscattering described in the present invention, the adjustable phase shifter includes:

[0023] The vector multiplier is used as an adjustable phase shifter. The gain and phase shift of the adjustable phase shifter are controlled by the baseband input scalar. The relationship between the phase shift and gain effect and the baseband input scalar is expressed as:

[0024]

[0025] Phase=arctan(V QBB / V IBB )

[0026] Among them, VIBB and V QBB The baseband input scalar for the I and Q channels, V O is the standardization factor.

[0027] As a preferred solution of the method for eliminating environmental carrier interference applicable to backscattering described in the present invention, wherein: using a detector to detect the strength value of the signal after elimination includes:

[0028] The input power of the signal source when it is connected to 50Ω plus 100dBm multiplied by the typical intensity value.

[0029] As a preferred solution of the method for eliminating environmental carrier interference applicable to backscattering described in the present invention, the step of judging the strength value of the eliminated signal according to the acceleration algorithm includes:

[0030] Initialize the program and turn off the reference source, assign initial values ​​to the attenuator and adjustable phase shifter, sample the detector data to obtain the test value, and if the test value is greater than the set power threshold, use the local search algorithm to search for a new phase shift value and reassign it;

[0031] If the test value is less than the set power threshold, the value is output as the optimal interference-eliminated signal.

[0032] In a second aspect, the present invention provides a system for eliminating environmental carrier interference suitable for backscattering, comprising:

[0033] A detection module, used to acquire an environmental signal, perform carrier detection on the environmental signal, and obtain a carrier signal;

[0034] An adjustment module, used for adjusting the amplitude and phase of the carrier signal by using an adjustable phase shifter and an attenuator to obtain a cancellation signal;

[0035] A superposition module, used for acquiring an interference signal, superimposing the cancellation signal and the interference signal on the same channel to perform interference cancellation;

[0036] The judgment module is used to detect the strength value of the eliminated signal by using a detector, judge the strength value of the eliminated signal according to the acceleration algorithm and adjust the attenuation and phase shift values ​​to obtain the optimal interference eliminated signal.

[0037] In a third aspect, the present invention provides a computing device, comprising:

[0038] Memory and processor;

[0039] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for eliminating environmental carrier interference applicable to backscattering are implemented.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for eliminating environmental carrier interference applicable to backscattering.

[0041] Beneficial effects of the present invention: The present invention can achieve at least 40dB of environmental carrier interference elimination effect, significantly improving the quality and reliability of backscatter communication. And because the system does not require additional spectrum resources, it is suitable for large-scale deployment, especially in those IoT applications that require long-term reliable communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0043] Figure 1 An overall flow chart of a method for eliminating environmental carrier interference applicable to backscattering provided by the present invention;

[0044] Figure 2 The test result of tag-free backscattering without power supply for a method for eliminating environmental carrier interference of backscattering provided by the present invention;

[0045] Figure 3 The test results of a method for eliminating environmental carrier interference of backscatter provided by the present invention under the condition of power supply without tag backscatter;

[0046] Figure 4 A test result of setting the attenuation value of a tagless backscattering attenuator of a method for eliminating environmental carrier interference of backscattering provided by the present invention to a maximum value;

[0047] Figure 5 A test result of backscattering with a label after elimination of the environmental carrier interference elimination method applicable to backscattering provided by the present invention;

[0048] Figure 6 The present invention provides a test result of labeled backscattering before elimination of an environmental carrier interference elimination method applicable to backscattering. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0052] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0053] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Example 1

[0056] Reference Figure 1, is an embodiment of the present invention, and provides a method for eliminating environmental carrier interference applicable to backscattering, comprising:

[0057] S100: Acquire an environmental signal, perform carrier detection on the environmental signal, and obtain a carrier signal;

[0058] Specifically, carrier detection is a signal processing technology that can separate useful carrier signals from complex environments. The carrier detection solution detects the received environmental signals and separates the carrier signals, laying the foundation for subsequent interference elimination.

[0059] It should be noted that through carrier detection, a pure carrier signal can be extracted from a signal containing various noises and interferences, providing high-quality input for data transmission and signal processing, and providing necessary information for interference elimination algorithms, such as the frequency and phase of the signal, thereby effectively reducing or eliminating the impact of interference.

[0060] S200: using an adjustable phase shifter and an attenuator to adjust the amplitude and phase of the carrier signal to obtain a cancellation signal;

[0061] It should be noted that by reconstructing a cancellation signal that is complementary to the interference signal, interference can be effectively removed from the received signal, thereby improving the signal purity and communication quality. The adaptive system can dynamically adjust parameters such as amplitude and phase according to environmental changes and interference characteristics, so that the system can work stably in a changing environment. Compared with the multi-antenna solution, the single-antenna solution can reduce hardware costs and system complexity, while still achieving efficient interference elimination effects through adaptive adjustment.

[0062] S300: Obtain an interference signal, and superimpose a cancellation signal and the interference signal on the same channel to perform interference cancellation;

[0063] In an embodiment of the present application, the interference signal received at the set time is the result of the signal sent by the transmitter at the set time minus the transmission delay of the interference channel being transmitted through the constant parameter channel and being affected by constant amplitude attenuation and constant time delay.

[0064] Specifically, when reconstructing the eliminated signal, the signal from the transmitter to the receiver mainly passes through a coupler and a circulator. This section is a constant parameter channel. If the signal at the transmitter is s(t), the interference signal is expressed as:

[0065] r sI (t) = k sI s(t-τ sI )

[0066] Among them, τ sI is the transmission delay of the interference channel, k sIis the amplitude attenuation factor of the channel.

[0067] In the embodiment of the present application, a coupler is used to divide the frequency of the transmitting end signal, the original signal is delayed by the same time unit as the delay of the elimination signal, the amplitude is adjusted by the amplitude attenuation factor of the elimination signal, and a phase change is introduced by a complex exponential term to obtain the elimination signal;

[0068] The signal at the receiving end is the backscattered signal plus the RF signal plus the interference signal plus the noise.

[0069] Specifically, the adaptive interference cancellation system covers spatial interference cancellation and radio frequency interference cancellation. For spatial interference cancellation, in order to adapt to more scenarios, a single-antenna solution with a circulator as the isolation element is selected. The signal is coupled out from the transmitter, and after adjusting parameters such as amplitude and phase, an cancellation signal complementary to the interference signal is reconstructed, and the cancellation signal is added to the interference signal to achieve cancellation.

[0070] In order to generate the cancellation signal, the transmitter uses a coupler to divide the transmitter signal and obtains the cancellation signal by adjusting the amplitude and phase. The adjustment of the amplitude and phase is achieved by attenuators and phase shifters in the actual circuit. The cancellation signal is expressed as:

[0071]

[0072] Among them, k c To eliminate the signal amplitude attenuation factor, τ c To eliminate the signal delay, θ c is the phase change, and s(t) is the transmitting end signal.

[0073] The signal r(t) at the receiving end is expressed as:

[0074] r(t)=r B (t)+r R (t)+r SI (t)+n(t)

[0075] Among them, r B (t) is the backscattered signal, n(t) is the noise, r SI (t) is the interference signal, r R (t) is the radio frequency signal, r SI (t) is usually higher than r B (t) is several orders of magnitude larger.

[0076] In the embodiment of the present application, the interference cancellation capability is expressed as:

[0077]

[0078] Among them, E SIis the energy of the interference signal, E N is the noise energy, E R is the energy of the residual interference signal;

[0079] When the delay of the cancellation signal is equal to the transmission delay of the interference signal, the attenuation factor of the cancellation signal is equal to the interference attenuation factor and the phase change satisfies π, the interference cancellation capability G is the strongest.

[0080] In the embodiment of the present application, a vector multiplier is used as an adjustable phase shifter, and the gain and phase shift of the adjustable phase shifter are controlled by a baseband input scalar. The relationship between the phase shift and gain effect and the baseband input scalar is expressed as:

[0081]

[0082] Phase=arctan(V QBB / V IBB )

[0083] Among them, V IBB and V QBB The baseband input scalar for the I and Q channels, V O is the standardization factor.

[0084] Specifically, the phase shifter and attenuator are designed, wherein the phase shifter uses a vector multiplier, that is, two independent RF inputs can be combined in any proportion, which is expressed as:

[0085]

[0086] Among them, V IRF and V QRF is the RF input vector of I channel and Q channel, V IBB and V QBB The baseband input scalar for the I and Q channels, V O is the normalization factor, which is 0.285V.

[0087] When used as an adjustable phase shifter, its gain and phase shift are controlled by the baseband input scalar, that is, the input V IBB and V QBB Voltage value.

[0088] It should be noted that by reconstructing a cancellation signal that is complementary to the interference signal, interference can be effectively removed from the received signal, thereby improving the signal purity and communication quality. The adaptive system can dynamically adjust parameters such as amplitude and phase according to environmental changes and interference characteristics, so that the system can work stably in a changing environment. Effective interference elimination can improve channel utilization, thereby increasing the overall transmission capacity of the system.

[0089] S400: using a detector to detect the strength value of the signal after elimination, judging the strength value of the signal after elimination according to an acceleration algorithm and adjusting the attenuation and phase shift values ​​to obtain an optimal signal after interference elimination;

[0090] In the embodiment of the present application, the input power when the signal source is connected at 50Ω plus 100dBm multiplied by the typical intensity value.

[0091] Specifically, the intensity of the signal after the detector detects elimination is expressed as:

[0092] V OUT =V SLOPE (P IN +100dBM)

[0093] Among them, P IN is the input power when the signal is connected to 50Ω, V at 900MHz SLOPE The typical value is 1818mV / dB.

[0094] In the embodiment of the present application, the program is initialized and the reference source is turned off, the attenuator and the adjustable phase shifter are assigned initial values, the detector data is sampled to obtain a test value, and if the test value is greater than the set power threshold, a local search algorithm is used to search for a new phase shift value and reassign the value;

[0095] If the test value is less than the set power threshold, the value is output as the optimal interference-eliminated signal.

[0096] Specifically, after initializing and shutting down the reference source, the attenuator and phase shifter are assigned initial values, which are the points of theoretical optimal elimination effect, and the power threshold is set based on the theoretical elimination value and elimination requirements. After sampling the detector data, if the test value is greater than the set power threshold, a local search algorithm is used to search for a new phase shift value and reassign the value; if the test value is less than the set power threshold, that is, the elimination effect is better than expected, then the value is selected as the result and the search ends. When the power threshold is the first time running, the corresponding power will be recorded when adjusting the attenuation value and phase shift value. After changing the attenuation and phase shift values, multiple groups of power are obtained, and the power threshold takes the minimum value of the multiple groups of power.

[0097] Specifically, the interference elimination circuit is divided into two parts, the right half includes digital and power components, and the left half includes RF components. The RF part mainly includes attenuators, phase shifters, detectors, circulators and several couplers. Among them, the attenuation range of the attenuator HMC1119 is 0-31.5dB, with a step value of 0.25dB; the phase shifter ADL5390 has a phase shift range of 360° and an accuracy better than 1°; the linear range of the detector AD8313 is 62dB; the power tolerance of the coupler X3C09P1 exceeds 70W. The MCU uses AGLN060, a nano-level low-power FPGA that can meet basic control requirements.

[0098] It should be noted that the local search algorithm combined with the feedback signal is used to realize the closed-loop control of the system, thereby improving the elimination speed. By optimizing the acceleration algorithm, the interference elimination system improves its adaptability to different environments, enhances its anti-interference ability, and ensures effective interference elimination. In addition, the algorithm also improves the real-time performance of interference elimination.

[0099] The above is a schematic scheme of a method for eliminating environmental carrier interference for backscattering in this embodiment. It should be noted that the technical scheme of the device for eliminating environmental carrier interference for backscattering and the technical scheme of the method for eliminating environmental carrier interference for backscattering mentioned above belong to the same concept, and the details of the technical scheme of the device for eliminating environmental carrier interference for backscattering in this embodiment that are not described in detail can all be referred to the description of the technical scheme of the method for eliminating environmental carrier interference for backscattering mentioned above.

[0100] The device for eliminating backscattered environmental carrier interference in this embodiment includes:

[0101] A detection module, used to acquire an environmental signal, perform carrier detection on the environmental signal, and obtain a carrier signal;

[0102] An adjustment module, used for adjusting the amplitude and phase of the carrier signal by using an adjustable phase shifter and an attenuator to obtain a cancellation signal;

[0103] A superposition module, used for acquiring an interference signal, superimposing the cancellation signal and the interference signal on the same channel to perform interference cancellation;

[0104] The judgment module is used to detect the strength value of the eliminated signal by using a detector, judge the strength value of the eliminated signal according to the acceleration algorithm and adjust the attenuation and phase shift values ​​to obtain the optimal interference eliminated signal.

[0105] This embodiment further provides a computing device, which is applicable to the case of eliminating backscattered environmental carrier interference, including:

[0106] A memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the environmental carrier interference elimination method applicable to backscattering as proposed in the above embodiment.

[0107] This embodiment further provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for eliminating environmental carrier interference applicable to backscattering proposed in the above embodiment is implemented.

[0108] The storage medium proposed in this embodiment and the method for eliminating environmental carrier interference suitable for backscatter proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0109] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer's floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.

[0110] Example 2

[0111] Reference Figure 2-Figure 6 This embodiment is different from the first embodiment in that it provides a verification test of a method for eliminating environmental carrier interference suitable for backscattering, in order to verify and illustrate the technical effects adopted in this method.

[0112] Taking the experimental test platform as an example, the RF source generates a 900MHz signal with a power of 0dB;

[0113] The power of the interference signal is evaluated in three cases: First, in the absence of power, the active RF device attenuator and phase shifter cannot form a path, so there is no cancellation signal, and the power of the interference signal can be measured as P SI ; Second, in the case of power supply, the power of the residual interference signal can be measured as P R ; Third, the attenuator attenuation value is set to the maximum value, and the power of the interference signal can be measured as P S ′I .

[0114] The test results of label-free backscattering are as follows: Figure 2-Figure 4 As shown,

[0115] like Figure 2 As shown in Figure 1, in the absence of power, active RF devices (such as attenuators and phase shifters) cannot work, so an effective signal path cannot be formed to eliminate interference. At this time, the power of the interference signal can be directly measured, and the result is P SI =-27.09dB;

[0116] like Figure 3 As shown in Figure 1, when the attenuator is set to the maximum attenuation value, the power of the interference signal can be reduced to the greatest extent. The interference signal power measured at this time is P S ′ I =-27.43dB;

[0117] like Figure 4 As shown in Figure 1, when the power is turned on, the active RF device starts to work, but due to the performance limitations of the device itself or other factors, the interference cannot be completely eliminated. At this time, the residual interference signal power that can be measured is P R =-71.02dB;

[0118] By comparing P SI and P R , the cancellation effect of the interference cancellation system is calculated to be 43dB;

[0119] The test results for backscatter tags are as follows: Figure 5-Figure 6 As shown, we can see that

[0120] like Figure 5 As shown, the power after elimination is -60.06dB;

[0121] like Figure 6 As shown, the power before elimination is -13.65dB, and the calculated elimination level is 46dB. The elimination level is equivalent to the harmonic level, indicating that the system can effectively control the impact of harmonics while eliminating interference.

[0122] The environmental carrier interference elimination system can achieve interference elimination greater than 40dB, effectively reducing the interference impact in backscatter communications, and can significantly improve the signal-to-noise ratio of the signal, thereby improving the reliability of communication and the quality of data transmission. Reducing interference can reduce system misoperation and instability caused by interference, and improve system stability. Effective interference elimination can reduce additional power consumption caused by interference, thereby improving energy efficiency.

[0123] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for eliminating environmental carrier interference applicable to backscattering, characterized in that: include: Acquire an environmental signal, perform carrier detection on the environmental signal, and obtain a carrier signal; The carrier signal is adjusted in amplitude and phase by using an adjustable phase shifter and an attenuator to obtain a cancellation signal; Acquire an interference signal, and superimpose the cancellation signal and the interference signal on the same channel to perform interference cancellation; The detector is used to detect the strength value of the signal after elimination, and the strength value of the signal after elimination is judged according to the acceleration algorithm and the attenuation and phase shift values ​​are adjusted to obtain the optimal signal after interference elimination.

2. The method for eliminating environmental carrier interference applicable to backscattering as claimed in claim 1, characterized in that: Interference signals include: The interference signal received at the set time is the result of the signal sent by the transmitter at the set time minus the transmission delay of the interference channel being transmitted through the constant parameter channel and being affected by constant amplitude attenuation and constant time delay.

3. The method for eliminating environmental carrier interference applicable to backscattering as claimed in claim 2, characterized in that: Elimination signals include: The transmitting end signal is divided by a coupler, the original signal is delayed by the same time unit as the delay of the elimination signal, the amplitude is adjusted by the amplitude attenuation factor of the elimination signal, and the phase change is introduced by the complex exponential term to obtain the elimination signal; The signal at the receiving end is the backscattered signal plus the RF signal plus the interference signal plus the noise.

4. The method for eliminating environmental carrier interference applicable to backscattering as claimed in claim 2 or 3, characterized in that: Interference cancellation includes: The interference cancellation capability is expressed as: Among them, E SI is the energy of the interference signal, E N is the noise energy, E R is the energy of the residual interference signal; When the delay of the cancellation signal is equal to the transmission delay of the interference signal, the attenuation factor of the cancellation signal is equal to the interference attenuation factor and the phase change satisfies π, the interference cancellation capability G is the strongest.

5. The method for eliminating environmental carrier interference applicable to backscattering as claimed in claim 4, characterized in that: Adjustable phase shifters include: The vector multiplier is used as an adjustable phase shifter. The gain and phase shift of the adjustable phase shifter are controlled by the baseband input scalar. The relationship between the phase shift and gain effect and the baseband input scalar is expressed as: Phase=arctan(V QBB / V IBB , Among them, V IBB and V QBB The baseband input scalar for the I and Q channels, V O is the standardization factor.

6. The method for eliminating environmental carrier interference applicable to backscattering as claimed in claim 5, characterized in that: The intensity values ​​of the signal after elimination detected by the detector include: The input power of the signal source when it is connected to 50Ω plus 100dBm multiplied by the typical intensity value.

7. The method for eliminating environmental carrier interference applicable to backscattering as claimed in claim 6, characterized in that: The intensity value of the signal after elimination is determined according to the acceleration algorithm, including: Initialize the program and turn off the reference source, assign initial values ​​to the attenuator and adjustable phase shifter, sample the detector data to obtain the test value, and if the test value is greater than the set power threshold, use the local search algorithm to search for a new phase shift value and reassign it; If the test value is less than the set power threshold, the value is output as the optimal interference-eliminated signal.

8. A system for eliminating backscattered environmental carrier interference, characterized in that: include: A detection module, used to acquire an environmental signal, perform carrier detection on the environmental signal, and obtain a carrier signal; An adjustment module, used for adjusting the amplitude and phase of the carrier signal by using an adjustable phase shifter and an attenuator to obtain a cancellation signal; A superposition module, used for acquiring an interference signal, superimposing the cancellation signal and the interference signal on the same channel to perform interference cancellation; The judgment module is used to detect the strength value of the eliminated signal by using a detector, judge the strength value of the eliminated signal according to the acceleration algorithm and adjust the attenuation and phase shift values ​​to obtain the optimal interference eliminated signal.

9. An electronic device, characterized in that: The device comprises: processor; a memory for storing processor-executable instructions; The processor is configured to call the instructions stored in the memory to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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