Broadband carrier multi-band interference suppression system and method

Abstract

The invention provides a broadband carrier multi-band interference suppression system and method, and relates to the technical field of interference suppression, and the method comprises the steps: carrying out the frequency domain analysis of a received broadband carrier signal when receiving a 5G new carrier signal; determining an interference dominant frequency band and an interference hybrid frequency band at the frequency point position, and determining a multi-domain control instruction when the inter-frequency interference of the broadband carrier multi-band interference is suppressed according to the interference dominant frequency band and the interference hybrid frequency band; obtaining a frequency band interference-to-signal ratio between a target signal component and an interference signal component of a 5G new carrier signal in the broadband carrier signal, and carrying out fusion alignment on the frequency band interference-to-signal ratio and the multi-domain control instruction to obtain a co-location interference path when the broadband carrier signal is propagated in a receiving channel; determining an interference amplitude limiting value when interference exists in the receiving channel according to the co-location interference path; and cancelling the interference amplitude limiting value from the received signal. According to the method and the device, the broadband carrier multi-band interference can be dynamically suppressed in a complex multi-band interference scene, so that the signal transmission reliability of broadband carrier communication is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of interference suppression, more particularly, the present application relates to a wideband carrier multi-band interference suppression system and method. BACKGROUND

[0002] Interference suppression is one of the core supporting technologies for the stable operation of a wideband carrier communication system, aiming to identify and weaken the influence of various types of interference signals in the communication process through signal processing, strategy control and other means, to maintain the integrity and transmission quality of the target signal, and to reduce the problems of increased error rate and data packet loss caused by interference. With the increasing demand for wideband carrier communication bandwidth and transmission rate in the fields of smart grid and industrial Internet of Things, the types of interference are becoming more diverse, and the accuracy and dynamic adaptability of interference suppression are significantly improved. Interference suppression is widely used in smart grid power line carrier (PLC) and industrial short-range broadband communication scenarios, and is a key technology to support the application of wideband carrier communication in complex electromagnetic environments.

[0003] However, existing wideband carrier multi-band interference suppression mostly uses single frequency domain filtering or fixed power control, without fine feature recognition of spectral distribution information, so that the interference suppression strategy lacks differentiated adaptation to different types of interference, and cannot accurately anchor the interference propagation source and reasonably suppress the boundary, resulting in insufficient inter-frequency interference suppression and problems such as excessive suppression of target signals or incomplete suppression of residual interference, so that the signal transmission quality and anti-interference stability of wideband carrier communication in complex multi-band interference scenarios cannot meet the demand. Therefore, how to dynamically suppress wideband carrier multi-band interference in complex multi-band interference scenarios to improve the signal transmission reliability of wideband carrier communication is a problem faced by the industry. SUMMARY

[0004] The present application provides a wideband carrier multi-band interference suppression system and method, which can dynamically suppress wideband carrier multi-band interference in complex multi-band interference scenarios to improve the signal transmission reliability of wideband carrier communication.

[0005] In the first aspect, the present application provides a wideband carrier multi-band interference suppression method, which comprises the following steps: When receiving a 5G new carrier signal, performing frequency domain analysis on the received wideband carrier signal to obtain spectral distribution information containing multiple subbands; performing feature recognition on all the spectral distribution information to obtain a dominant interference frequency band and a mixed interference frequency band at the frequency point position, and determining a multi-domain control instruction for inter-frequency interference suppression in wideband carrier multi-band interference according to the dominant interference frequency band and the mixed interference frequency band; obtaining a frequency band jam-to-signal ratio between a target signal component and an interference signal component of the 5G new carrier signal in the wideband carrier signal, fusing and aligning the frequency band jam-to-signal ratio and the multi-domain control instruction to obtain a co-sited interference path of the wideband carrier signal when propagating in a receiving channel; and then determining an interference clipping value when the receiving channel exists interference from the co-sited interference path. eliminating the interference clipping value from the receiving signal, and then suppressing the wideband carrier multi-frequency band interference when receiving the 5G new carrier signal.

[0006] In the embodiment, the spectrum distribution information refers to a data set composed of the frequency range, the corresponding average power, the center frequency and the bandwidth data of each sub-band.

[0007] In the embodiment, feature recognition is performed on all the spectrum distribution information to obtain the interference dominant frequency band and the interference mixed frequency band at the frequency point position, which specifically includes: extracting an interference frequency domain feature according to the spectrum distribution information; determining a discrimination mode of the interference dominant frequency band and the interference mixed frequency band according to the interference frequency domain feature; recognizing the interference dominant frequency band and the interference mixed frequency band at the frequency point position according to the discrimination mode.

[0008] In the embodiment, the frequency point position refers to specific frequency identification information of the frequency band in the frequency spectrum, including the center frequency, the start frequency and the end frequency of the frequency band.

[0009] In the embodiment, the multi-domain control instruction refers to a set of operation instructions that can be directly executed by the wideband carrier device.

[0010] In the embodiment, obtaining the frequency band jam-to-signal ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal specifically includes: obtaining a frequency domain feature of the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal; determining energy distribution of the target signal and the interference signal on each frequency band based on the frequency domain features of the target signal component and the interference signal component; determining the frequency band jam-to-signal ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal according to the energy distribution on all frequency bands.

[0011] In the embodiment, the frequency band jam-to-signal ratio refers to a ratio of the total energy of the interference signal to the total energy of the target signal in each frequency band.

[0012] In the embodiment, determining the interference clipping value when the receiving channel exists interference from the co-sited interference path specifically includes: extracting an interference strength distribution of the interfering signal in the received channel from the co-sited interference path; determining channel state information of the received channel in the presence of interference according to the interference strength distribution; determining an interference clipping value in the presence of interference of the received channel according to the channel state information.

[0013] In the embodiment, the interference clipping value refers to a maximum interference signal power value allowed by the receiving end without affecting normal demodulation of the target signal.

[0014] In a second aspect, the application provides a wideband carrier multi-band interference suppression system for performing a wideband carrier multi-band interference suppression method, and the interference suppression system comprises: a frequency domain analysis module configured to perform frequency domain analysis on the received wideband carrier signal to obtain spectral distribution information containing multiple sub-bands when receiving the 5G new carrier signal; a feature recognition module configured to perform feature recognition on all the spectral distribution information to obtain an interference dominant frequency band and an interference mixed frequency band at a frequency point position, and determine a multi-domain control instruction in the presence of inter-frequency interference suppression in the wideband carrier multi-band interference according to the interference dominant frequency band and the interference mixed frequency band; a fusion alignment module configured to obtain a frequency band interference to signal ratio between a target signal component and an interference signal component of the 5G new carrier signal in the wideband carrier signal, and perform fusion alignment on the frequency band interference to signal ratio and the multi-domain control instruction to obtain a co-sited interference path of the wideband carrier signal when propagating in a received channel; and further determine an interference clipping value in the presence of interference of the received channel according to the co-sited interference path; an interference cancellation module configured to cancel the interference clipping value from the received signal, thereby suppressing the wideband carrier multi-band interference when receiving the 5G new carrier signal.

[0015] The technical scheme provided by the embodiments of the application has the following beneficial effects: The frequency domain analysis is performed on the received wideband carrier signal to obtain spectral distribution information containing multiple sub-bands when receiving the 5G new carrier signal; feature recognition is performed on all the spectral distribution information to obtain an interference dominant frequency band and an interference mixed frequency band at a frequency point position, and a multi-domain control instruction in the presence of inter-frequency interference suppression in the wideband carrier multi-band interference is determined according to the interference dominant frequency band and the interference mixed frequency band; a frequency band interference to signal ratio between a target signal component and an interference signal component of the 5G new carrier signal in the wideband carrier signal is obtained, and fusion alignment is performed on the frequency band interference to signal ratio and the multi-domain control instruction to obtain a co-sited interference path of the wideband carrier signal when propagating in a received channel; and further an interference clipping value in the presence of interference of the received channel is determined according to the co-sited interference path; the interference clipping value is cancelled from the received signal, thereby suppressing the wideband carrier multi-band interference when receiving the 5G new carrier signal.

[0016] It can be seen that in the present application, the precision of interference suppression can be improved under the premise that the existing wideband carrier multi-band interference suppression lacks fine frequency domain analysis capability, the suppression strategy is extensive and lacks pertinence. By determining the spectrum distribution information, the ability of data fragmentation and frequency-power correspondence ambiguity in frequency domain analysis can be improved. By determining the multi-domain control instruction for inter-frequency interference suppression in wideband carrier multi-band interference, the limitations of traditional single frequency domain filtering or fixed power control can be broken through, the problem of excessive switching of interference mixed frequency bands affecting communication continuity can be avoided, and the pertinence and resource utilization efficiency of inter-frequency interference suppression can be improved. By obtaining the frequency band interference ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal, the defects of being unable to accurately locate the co-site interference source and lacking dynamic suppression power boundary can be solved, and the accurate boundary control capability of interference suppression can be improved. By canceling the interference amplitude value from the received signal to suppress the wideband carrier multi-band interference when receiving the 5G new carrier signal, the problem of poor adaptability of fixed coefficient filtering to dynamic interference and unstable cancellation effect is solved. While ensuring that the interference is reduced below the amplitude limit, the integrity of the target signal is preserved, and the signal transmission quality and anti-interference stability of wideband carrier communication in a complex multi-band interference scene are significantly improved.

[0017] In summary, the technical solution adopted by the present application can dynamically suppress wideband carrier multi-band interference in a complex multi-band interference scene to improve the signal transmission reliability of wideband carrier communication. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is an exemplary flowchart of a wideband carrier multi-band interference suppression method according to the present application; Figure 2 is a flowchart of determining a multi-domain control instruction according to the present application; Figure 3 is a flowchart of determining a co-site interference path according to the present application; Figure 4 is a module structure diagram of a wideband carrier multi-band interference suppression system according to the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0021] The embodiment of the present application provides a wideband carrier multi-band interference suppression system and method, the core of which is that when a 5G new carrier signal is received, frequency domain analysis is performed on the received wideband carrier signal to obtain frequency spectrum distribution information containing multiple subbands; feature recognition is performed on all the frequency spectrum distribution information to obtain a dominant interference frequency band and a mixed interference frequency band at a frequency point position, and a multi-domain control instruction is determined according to the dominant interference frequency band and the mixed interference frequency band when frequency interference suppression is performed between the interference frequencies of the wideband carrier; a frequency band interference to noise ratio between a target signal component and an interference signal component of the 5G new carrier signal in the wideband carrier signal is obtained, the frequency band interference to noise ratio and the multi-domain control instruction are fused and aligned to obtain a co-site interference path of the wideband carrier signal when the wideband carrier signal propagates in a receiving channel; and then an interference limiting value is determined according to the co-site interference path when interference exists in the receiving channel; and the interference limiting value is cancelled from the received signal to suppress the wideband carrier multi-band interference when the 5G new carrier signal is received.

[0022] Embodiment one, in order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific implementation manners, referring to Figure 1 As shown in the figure, the figure is an exemplary flowchart of a wideband carrier multi-band interference suppression method according to the embodiment of the present application, the interference suppression method comprising the following steps: In step S1, when a 5G new carrier signal is received, frequency domain analysis is performed on the received wideband carrier signal to obtain frequency spectrum distribution information containing multiple subbands.

[0023] In specific implementation, first, a high-speed analog-to-digital converter is used to sample the received 5G new carrier signal, the sampling rate is set to more than 2 times the highest frequency of the signal according to the Nyquist criterion, to ensure that no frequency information is lost; a Hanning window is applied to the collected time domain data block to eliminate the frequency spectrum leakage caused by signal truncation by point-by-point multiplication; a fast Fourier transform is performed to decompose the time domain data into frequency domain complex signals, and the power value of each frequency point is calculated through the sum of squares of the real part and the imaginary part; the wide frequency spectrum is divided into multiple equal-width subbands according to the subband division rules specified in the 5G protocol, the average power of all frequency points in each subband is calculated, the start frequency, the end frequency and the center frequency of each subband are recorded synchronously, and the subband frequency spectrum distribution information is formed, which is not limited here.

[0024] It should be noted that in the present application, the spectrum distribution information refers to a data set composed of the frequency range, the corresponding average power, the center frequency and the bandwidth data of each sub-band.

[0025] In step S2, feature recognition is performed on all the spectrum distribution information to obtain the interference dominant frequency band and the interference mixed frequency band at the frequency point position, and a multi-domain control instruction in the broadband carrier multi-band interference intermediate frequency interference suppression is determined according to the interference dominant frequency band and the interference mixed frequency band.

[0026] In the present embodiment, the interference dominant frequency band and the interference mixed frequency band at the frequency point position can be obtained by the following steps: extracting interference frequency domain features according to the spectrum distribution information; determining a discrimination mode of the interference dominant frequency band and the interference mixed frequency band according to the interference frequency domain features; recognizing the interference dominant frequency band and the interference mixed frequency band at the frequency point position according to the discrimination mode.

[0027] In a specific implementation, first, the frequency range and average power data of each sub-band are retrieved from the spectrum distribution information, and the power change curve is scanned sub-band by sub-band. The sliding window method is used to intercept the power sequence of each sub-band, and the peak power, power change standard deviation and spectrum width of the sequence are calculated. The peak power is the maximum power in the window, the standard deviation is calculated by "the square sum of the difference between each power value and the average value divided by the number of data and then taking the square root", and the spectrum width is the frequency interval span corresponding to the peak power. The sample data is derived from the historical interference signal measurement data in the 5G communication scenario, and is verified by comparing with the characteristic parameters of the known interference signal to ensure that the extracted peak power, standard deviation and spectrum width can effectively distinguish the target signal and the interference signal of the 5G new signal. Then, based on the spectrum difference theory of 5G target signal and interference signal, the threshold range of characteristic parameters is set: the ratio of peak power to 5G target signal power, the proportion of spectrum width to total width of sub-band, and power change standard deviation are used as core judgment indexes. A large number of 5G signal samples containing known frequency band types are selected, the extracted interference frequency domain features are put into the preset threshold for testing, and the threshold is adjusted to make the discrimination accuracy reach the preset standard. If the sample recognition accuracy under a certain set of thresholds is lower than the requirement, the threshold is adjusted according to the logic of "increasing the peak power ratio threshold of the interference dominant frequency band and reducing the standard deviation threshold", and finally the "multi-index combination matching" discrimination mode is formed. Finally, the interference frequency domain features are retrieved sub-band by sub-band, and the characteristic parameters are matched with the interval thresholds in the discrimination mode one by one. If the peak power ratio, spectrum width proportion and power standard deviation of a certain sub-band all meet the characteristic interval of the interference dominant frequency band, the sub-band is marked as the interference dominant frequency band, and the center frequency, starting frequency and ending frequency are recorded. If it meets the characteristic interval of the interference mixed frequency band, it is marked as the interference mixed frequency band and the frequency point position is recorded at the same time. If none of them meets the characteristic interval, it is marked as the non-interference frequency band. After all the sub-bands are matched, the consistency between the recognition result and the actual frequency band type is verified to ensure that the recognition accuracy meets the 5G communication anti-interference requirement.

[0028] It should be noted that in the present application, the frequency point position refers to the specific frequency identification information of the frequency band in the frequency spectrum, including the center frequency, starting frequency and ending frequency of the frequency band; the interference frequency domain feature refers to the data set of the unique attribute of the interference signal in the frequency dimension; the discrimination mode refers to the explicit rule set for distinguishing the interference dominant frequency band and the interference mixed frequency band; the interference dominant frequency band refers to the sub-band in which the interference signal is absolutely dominant and the target signal is negligible; and the interference mixed frequency band refers to the sub-band in which the interference and the target signal coexist.

[0029] Preferably, in the present embodiment, the multi-domain control instruction in the wideband carrier multi-band interference intermediate frequency interference suppression is determined according to the interference dominant frequency band and the interference mixed frequency band, and the interference dominant frequency band and the interference mixed frequency band are determined according to the interference frequency domain feature. Figure 2As shown, the figure is a flow diagram of determining the multi-domain control instruction in some embodiments of the present application. The multi-domain control instruction in the embodiment can be implemented by the following steps: In step S21, a distribution impact index of the interference in the frequency domain is determined according to the interference dominant frequency band and the interference mixed frequency band. In step S22, frequency domain filtering and power control strategies for different frequency bands are determined according to the distribution impact index. In step S23, a time-frequency domain joint interference suppression relationship is constructed according to all the frequency domain filtering and all the power control strategies. In step S24, a multi-domain control instruction in the wideband carrier multi-frequency band interference inter-frequency interference suppression is determined based on the interference suppression relationship.

[0030] In a specific implementation, first, the sample data is derived from the measured spectrum data of different interference types in a 5G communication scenario. The total bandwidth of the interference dominant frequency band and the interference mixed frequency band is counted, the proportion of the total bandwidth of the two types of frequency bands in the total working bandwidth of the 5G new carrier is calculated, and the interference frequency band coverage is obtained. Then, the average interference power in the two types of frequency bands is measured, and compared with the average power of the 5G target signal to obtain the proportion of the interference power. Finally, the overlapping bandwidth of the two types of frequency bands and the target signal sub-band is calculated, and divided by the total bandwidth of the target signal sub-band to obtain the interference-signal overlap. By comparing with the anti-interference threshold specified in the 5G communication protocol, it is ensured that the three indicators can comprehensively reflect the influence of interference on the 5G signal. Then, according to the power budget theory and filtering technology principle of 5G signal transmission, the threshold interval of the indicators is set: if the interference frequency band coverage of a certain frequency band exceeds the preset proportion and is the interference dominant frequency band, a band-stop filter is selected, the center frequency of the filter is aligned with the center frequency of the frequency band, the bandwidth is matched with the width of the frequency band, and the receiving power of the frequency band is reduced at the same time; if it is an interference mixed frequency band and the interference-signal overlap is in the preset interval, an adaptive filter is used, the filtering weight is adjusted according to the proportion of the interference power, and the higher the proportion, the greater the weight, and the target signal transmission power is moderately improved at the same time. Through multiple 5G interference scene tests, the signal bit error rate after the strategy execution meets the protocol requirements by adjusting the parameters. Then, based on the 5G frame structure and time slot division specification, the time domain is divided into time slots with fixed length, and the change of the interference power proportion in each frequency band in different time slots is monitored: for the time slots with the interference power proportion exceeding the preset value, the frequency domain filtering time of the corresponding frequency band is set to the whole time slot, and the power control maintains low receiving power; for the time slots with the interference power proportion in the middle interval, the filtering time is set to a certain proportion of the time slot, and the target signal power is improved synchronously. Taking "time slot-frequency band-frequency domain filtering parameter-power parameter" as the core dimension, a mapping table is constructed, the rationality of the mapping relationship is verified by simulating the 5G dynamic interference scene, and it is ensured that the strategy switching is smooth under different time slots. Finally, from the time-frequency domain joint interference suppression relationship mapping table, the frequency domain filtering parameters and power control parameters of each frequency band in each time slot are extracted, converted into an instruction format recognizable by 5G equipment, and the key information such as frequency band identification, filter type, center frequency, bandwidth, opening time, receiving power value, and transmission power value in the instruction is determined. Logical verification is performed on all instructions to check the conflicts of instructions in different time slots of the same frequency band, the interference suppression effect and signal transmission quality after the instruction execution are verified by inputting the instructions into the 5G equipment simulation platform for testing, and it is ensured that the instructions are accurate, consistent, and meet the equipment execution requirements. That is, the multi-domain control instructions in the broadband carrier multi-frequency band interference frequency domain interference suppression are obtained, which will not be described here.

[0031] It should be noted that in the present application, the inter-frequency interference suppression refers to the operation of reducing the influence of interference generated between different frequency bands of a wideband carrier through technical means, protecting normal transmission of signals in each frequency band, and reducing mutual interference; the distribution influence index refers to a data set quantifying the degree of influence of a dominant interference frequency band and an interference mixed frequency band on the frequency domain resource occupation and signal of a wideband carrier; the frequency domain filtering refers to a method of processing signals in the frequency domain, retaining target useful signals and filtering out interference signals, so as to improve signal purity and reduce interference influence; the power control strategy refers to an operation scheme for different frequency bands, which suppresses interference through filtering and adjusts power to protect signals; the interference suppression relationship refers to a mapping rule of associating time domain resource allocation with frequency domain filtering and power control strategy; and the multi-domain control instruction refers to a set of operation instructions that can be directly executed by a wideband carrier device.

[0032] In step S3, a frequency band interference to signal ratio between a target signal component and an interference signal component of the 5G new carrier signal in the wideband carrier signal is obtained, the frequency band interference to signal ratio and the multi-domain control instruction are fused and aligned to obtain a co-site interference path of the wideband carrier signal when propagating in a receiving channel; and then an interference clipping value when the receiving channel exists interference is determined by the co-site interference path.

[0033] In the present embodiment, the frequency band interference to signal ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal can be achieved by the following steps: Obtaining frequency domain features of the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal; Determining energy distribution of the target signal and the interference signal on each frequency band based on the frequency domain features of the target signal component and the interference signal component; Determining the frequency band interference to signal ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal according to the energy distribution on all frequency bands.

[0034] In a specific implementation, first, the sample data is derived from a measured wideband carrier signal in a 5G communication scenario, sampled according to the Nyquist criterion by using a high-speed analog-to-digital converter, and after collection, a Hanning window is applied to the time-domain data, a fast Fourier transform is performed to obtain a frequency-domain complex signal, and the power values of each frequency point are calculated. The characteristics of the target signal component are identified: the frequency points with the same frequency as the preset carrier frequency of the 5G protocol and the symmetrically distributed power with "high in the center and low on both sides" are marked, and the center frequency, power peak value, and spectral width are recorded. The characteristics of the interference signal component are identified: the frequency points with asymmetric power peaks and irregular power fluctuations are marked, and the peak frequency, interference bandwidth, and maximum power value are recorded. The characteristics are verified by comparison with the known 5G target signal characteristic library to ensure that the two types of characteristics are not confused, that is, the frequency-domain characteristics of the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal are obtained. Then, according to the frequency band division standard specified in the 5G protocol, the wideband frequency range is divided into equal-width sub-bands, and the start and end frequencies of each sub-band are determined. The target signal frequency points falling within the frequency band are selected one by one, and the total energy of these frequency points is calculated by using the "arithmetic sum" method. Similarly, the frequency points of the interference signal in the frequency band are selected and summed to obtain the total energy of the interference signal, that is, the energy distribution of the target signal and the interference signal in each frequency band is obtained. Finally, the total energy of the interference signal and the total energy of the target signal are extracted from the energy distribution table one by one, and the ratio is calculated by using the calculation model "frequency band interference to signal ratio = total energy of interference signal / total energy of target signal". If the target signal energy in a certain frequency band is 0, mark the interference to signal ratio as "meaningless"; if the interference signal energy is 0, mark the interference to signal ratio as 0, and form the frequency band interference to signal ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal.

[0035] It should be noted that in this application, the target signal component refers to the part of the wideband carrier signal that carries useful communication information; the interference signal component refers to the part of the wideband carrier signal that is irrelevant to the target signal; the frequency-domain characteristics of the target signal component and the interference signal component refer to the data set of the unique attributes of the target signal and the interference signal in the frequency dimension; the energy distribution in each frequency band refers to the data table quantifying the total energy of the target signal and the interference signal in each sub-band; and the frequency band interference to signal ratio refers to the ratio of the total energy of the interference signal to the total energy of the target signal in each frequency band.

[0036] Preferably, in this embodiment, the frequency band interference to signal ratio and the multi-domain control instruction are fused and aligned to obtain the co-site interference path of the wideband carrier signal when propagating in the receiving channel, as shown in FIG. 5. Figure 3 The co-site interference path can be determined by using the following steps in this embodiment: In step S31, a channel interference time limit rule is constructed according to the frequency band interference to signal ratio and the multi-domain control instruction. In step S32, the channel interference time limit rule is matched with the propagation characteristics of the receiving channel to obtain an interference propagation characteristic of the interference signal when propagating on the receiving channel; In step S33, path loss information corresponding to co-site interference intensity is generated based on the interference propagation characteristic; In step S34, a co-site interference path of the wideband carrier signal when propagating in the receiving channel is determined according to the path loss information.

[0037] In specific implementation, first, the frequency band interference ratio is divided into three levels of high, medium and low according to the interference intensity, and then parameters such as execution time length and triggering condition in the control instruction of each frequency band are extracted. The channel interference time limit rule is constructed according to “interference ratio level - corresponding frequency band - control instruction type - execution start time - execution end time”: the instruction start time of the high interference level frequency band is reserved in advance for preparation, and the end time is delayed to ensure complete suppression; the original time length of the medium and low level is set. Then, the propagation characteristics of the 5G receiving channel are measured by using a vector network analyzer, and the signal attenuation value and propagation delay are measured at each frequency point in the channel operating frequency range to form a “frequency - attenuation - delay” data table. The “frequency band - instruction execution time” in the channel interference time limit rule is matched with the data table, the attenuation change and delay value of the corresponding frequency band in the instruction execution period are extracted, and the interference signal intensity change trend over time is combined to integrate the interference propagation characteristic containing frequency, attenuation dynamic change, delay and corresponding time. Then, the initial transmission power of the co-site interference source is queried and obtained, and the received power of the interference signal on the corresponding propagation path is extracted from the interference propagation characteristic. The calculation model of “path loss = initial transmission power of interference source - received power of interference signal - inherent loss of transmission medium” is used, and the inherent loss of transmission medium is determined according to the 5G communication scene (such as space propagation and cable transmission) to determine the value range. Repeat the calculation for all possible propagation paths to form a path loss information table of “path type - corresponding frequency band - co-site interference intensity - path loss value”. Finally, possible co-site interference path types around the 5G receiving end are listed, such as space radiation path and cable crosstalk path. The loss value of each path and the corresponding co-site interference intensity are extracted from the path loss information table, and compared with the actual interference intensity measured by the receiving end to calculate the difference between the interference intensity of each path and the measured value. The path with the smallest difference is preliminarily determined as the candidate path, and the matching degree of the loss value of the path in more than 80% of the frequency bands and the measured interference intensity is verified. Through multiple tests in the actual 5G communication scene, the stability and consistency of the candidate path are confirmed, and the co-site interference path is finally determined.

[0038] It should be noted that in the present application, the fusion alignment refers to a method of combining the frequency band signal-to-interference ratio and the multi-domain control instruction to adjust to an adaptive state; the propagation characteristics of the receiving channel refer to the propagation law of attenuation, delay, and dispersion presented when a signal propagates in the receiving channel; the interference time limit rule refers to a rule set associating the frequency band signal-to-interference ratio, the multi-domain control instruction, and the interference action time; the interference propagation characteristics refer to a property set of attenuation, delay, dispersion, and the like presented when an interference signal propagates in the receiving channel; the path loss information refers to a data set quantifying the power attenuation degree of an interference signal in the process of propagating from an interference source to a receiving end; the co-site interference intensity refers to the power intensity of an interference signal generated by a co-site interference source when reaching the receiving end; and the co-site interference path refers to a physical channel through which an interference signal generated by a co-site interference source is transmitted to the receiving end.

[0039] In the present embodiment, the determination of the interference clipping value when the receiving channel is interfered by the co-site interference path can be implemented by the following steps: extracting the interference intensity distribution of the interference signal in the receiving channel from the co-site interference path; determining the channel state information when the receiving channel is interfered according to the interference intensity distribution; determining the interference clipping value when the receiving channel is interfered according to the channel state information.

[0040] In a specific implementation, first, monitoring points are arranged at uniform intervals on the determined co-site interference path, and a spectrum analyzer is used to measure the interference signal power spectrum density of each frequency point point by point, and the position information of each monitoring point is recorded synchronously. All measurement data are arranged in three dimensions of "position - frequency - power", and the same position multiple sets of repeated measurement data are processed by the arithmetic average method to reduce errors, and then compared and verified with the intensity distribution characteristics of the known 5G interference scene to ensure that the extracted distribution data can truly reflect the interference change law, and the processed measurement data are used as the interference intensity distribution of the interference signal in the receiving channel. Then, the core parameters are extracted from the interference intensity distribution data: the interference bandwidth is obtained by counting the frequency range whose power exceeds the preset reference value; the frequency corresponding to the power spectrum peak is located as the interference center frequency; the average interference power is obtained by calculating the power average in the interference bandwidth by the arithmetic average method; the standard deviation of the power data at different positions is analyzed to obtain the fading characteristics; the multipath delay distribution is obtained by the impulse response measurement method to determine the delay spread, i.e. the channel state information when the receiving channel exists interference. Finally, the minimum receiving sensitivity of the target signal specified in the 5G protocol and the actual power of the target signal actually measured at the receiving end. The calculation model of "interference amplitude limiting value = target signal actual power - (target signal actual power - minimum receiving sensitivity) x safety factor" is used, wherein the safety factor is set to a reasonable value range according to the error rate requirement of 5G communication. The signal demodulation effect under different safety factors is tested through the 5G interference simulation platform, the coefficient is adjusted so that the error rate corresponding to the interference amplitude limiting value meets the protocol standard, and finally a stable and reliable interference amplitude limiting value is determined.

[0041] It should be noted that in the present application, the interference intensity distribution refers to the distribution of the interference signal power with position, frequency or time change on the co-site interference path; the channel state information refers to the set of transmission characteristic parameters of the receiving channel in the presence of interference; and the interference amplitude limiting value refers to the maximum interference signal power value allowed by the receiving end without affecting the normal demodulation of the target signal.

[0042] In step S4, the interference amplitude limiting value is canceled from the received signal, thereby suppressing the wideband carrier multi-band interference when receiving the 5G new carrier signal.

[0043] In a specific implementation, first, the interference clipping value is the maximum interference power threshold allowed by the 5G receiving end, balancing the interference suppression effect and the integrity of the target signal, and the interference cancellation is performed by generating a reverse signal to cancel the out-of-limit interference, thereby ensuring the transmission of the 5G new carrier signal. The specific process is as follows: a high-speed analog-to-digital converter is used to sample the received wideband carrier signal, which is converted to the frequency domain through fast Fourier transform, and the interference power is extracted sub-band by sub-band and compared with the interference clipping value one by one. For the sub-band with excessive interference power, the adaptive interference cancellation module is started, and the reference signal of the co-site interference path is input, the filter coefficient is dynamically adjusted through the least mean square error algorithm, and the cancellation signal with equal amplitude and opposite phase to the interference signal is generated, which is superimposed with the received signal to achieve accurate cancellation. The sub-band interference power is continuously monitored during the cancellation process until it is reduced below the clipping value, and then the processed frequency domain signal is converted back to the time domain through inverse fast Fourier transform. The cancellation effect is tested through the 5G simulation platform, the filter coefficient is adjusted to make the signal bit error rate meet the 5G protocol requirements, effectively solving the problem of poor adaptability of traditional fixed filtering to time-varying interference, avoiding excessive suppression of the target signal, accurately suppressing the wideband carrier multi-band interference, and ensuring the high-speed and low-latency transmission of the 5G new carrier signal. Here, no further description is given.

[0044] As can be seen from the above, in the present application, the accuracy of interference suppression can be improved under the premise that the existing wideband carrier multi-band interference suppression lacks fine frequency domain analysis capability, the suppression strategy is extensive and lacks pertinence. By determining the spectrum distribution information, the ability to analyze the frequency domain with fragmented data and ambiguous frequency-power correspondence can be improved. By determining the multi-domain control instruction during inter-frequency interference suppression in wideband carrier multi-band interference, the limitations of traditional single frequency domain filtering or fixed power control can be overcome, the problem of excessive switching of mixed frequency bands affecting communication continuity can be avoided, and the pertinence and resource utilization efficiency of inter-frequency interference suppression can be improved. By obtaining the frequency band interference ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal, the problem of being unable to accurately locate the co-site interference source and lacking dynamic suppression power boundary can be solved, and the accurate boundary control capability of interference suppression can be improved. By canceling the interference clipping value from the received signal to suppress the wideband carrier multi-band interference when receiving the 5G new carrier signal, the problem of poor adaptability of fixed coefficient filtering to dynamic interference and unstable cancellation effect can be solved, while ensuring that the interference is reduced below the clipping value and preserving the integrity of the target signal, significantly improving the signal transmission quality and anti-interference stability of wideband carrier communication in complex multi-band interference scenarios.

[0045] In summary, the technical solution adopted by the present application can dynamically suppress wideband carrier multi-band interference in complex multi-band interference scenarios to improve the signal transmission reliability of wideband carrier communication.

[0046] Embodiment two, the application provides a wideband carrier multi-band interference suppression system, reference Figure 4 As shown in the figure, it is a module structure diagram of a wideband carrier multi-band interference suppression system according to the embodiment of the application, the interference suppression system comprises: The frequency domain analysis module 100 is used for performing frequency domain analysis on the received wideband carrier signal when receiving the 5G new carrier signal, and obtaining the frequency spectrum distribution information containing multiple subbands; The feature recognition module 200 is used for performing feature recognition on all the frequency spectrum distribution information, obtaining the interference dominant frequency band and the interference mixed frequency band on the frequency point position, and determining the multi-domain control instruction in the frequency domain interference suppression of the wideband carrier multi-band interference according to the interference dominant frequency band and the interference mixed frequency band; The fusion alignment module 300 is used for obtaining the frequency band interference to signal ratio between the target signal component and the interference signal component of the 5G new carrier signal in the wideband carrier signal, and performing fusion alignment on the frequency band interference to signal ratio and the multi-domain control instruction, to obtain the co-site interference path of the wideband carrier signal when propagating in the receiving channel; and then determining the interference limiting value when the receiving channel exists interference according to the co-site interference path; The interference cancellation module 400 is used for canceling the interference limiting value from the received signal, and further suppressing the wideband carrier multi-band interference when receiving the 5G new carrier signal.

[0047] The application is described with reference to the flowcharts and / or block diagrams of the method, equipment (system) and computer program product according to the embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to the processor of the general-purpose computer, special-purpose computer, embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The device for realizing the functions specified in one block or multiple blocks.

[0048] Those skilled in the art can understand that all or part of the steps of various methods in the above embodiments can be completed by instructing the relevant hardware by means of a program, and the program can be stored in a computer readable storage medium, including Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically-Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other medium that can be used to carry or store data in a computer readable manner.

[0049] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

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