99 results about "Narrowband interference" patented technology

The invention relates to the technical field of 5G networks, in particular to a 5G network intelligent optimization method and system, and the method comprises the steps: obtaining 5G network signal data, recognizing an abnormal power spectral density region, carrying out the filtering extraction of the abnormal power spectral density region, and separating interference signals, interference types including narrowband interference, broadband interference and directional interference; extracting features from the obtained interference signals, and performing interference type identification according to a random forest algorithm; starting a corresponding anti-interference means according to the interference type, and generating operation state data in real time; a bee colony algorithm is adopted to simulate bee behaviors for iterative search, and a local optimal resource scheduling strategy is determined; and executing the resource scheduling strategy, feeding back an execution effect, and restarting the bee colony algorithm to determine a new resource scheduling strategy if the execution effect does not reach a set expectation. Therefore, the problems of lack of dynamic adaptive adjustment, single anti-interference means, lack of cross-base station collaboration and the like in the anti-interference aspect in the prior art are solved.

The invention relates to the technical field of satellite transmission service or radio transmission service of a space station or an airborne station, in particular to a narrow-band interference elimination method based on spread spectrum communication applied to satellite transmission service, which comprises the following steps: S1, performing FFT (Fast Fourier Transform) operation on a digital baseband signal, converting the digital baseband signal into a frequency domain signal, determining a judgment threshold according to the background noise power, and judging a component greater than the threshold as an interference signal; s2, based on a sequential return-to-zero algorithm or a sequential pruning algorithm, frequency points with interference signal components in each frequency domain under the AWGN condition are cut off; s3, using windowed FFT operation, and popularizing the application under the AWGN condition in the S2 to the application under the narrowband interference condition; and S4, reducing the frequency domain signal after the interference signal component frequency points are removed into a time domain signal by adopting IFFT (Inverse Fast Fourier Transform) operation. The method has a good application prospect in the fields of manufacturing of space-based satellite systems and other spacecrafts, manufacturing of satellite antennas and other communication system equipment, satellite transmission services and the like.

The invention relates to a cable partial discharge defect identification method based on a support vector machine, and belongs to the technical field of electrics. The problems that an existing method is low in recognition rate and prone to interference are solved. The method comprises the following steps: firstly, carrying out interference suppression on an acquired partial discharge high-frequency signal, wherein the interference suppression comprises narrowband interference suppression by subspace reconstruction and frequency slice wavelet transform white noise suppression based on ensemble empirical mode decomposition; then, carrying out support vector multi-classification by utilizing an optimized support vector data description algorithm, and constructing a plurality of classifiers; and finally, calculating the generalized distance from a test sample to each classifier, and making a decision, thereby achieving the recognition of the partial discharge defect. According to the method, the partial discharge defect recognition rate is effectively improved, the anti-interference capability is high, and a reliable technical means is provided for power cable insulation state detection.

The invention discloses a frequency hopping signal synchronization method based on double decision thresholds, which belongs to the technical field of wireless communication, and comprises the following steps: designing a single frequency hopping time slot, a high decision threshold and a low decision threshold; in each frequency hopping time slot, a correlation value of a synchronization training sequence and a local synchronization sequence is calculated, the calculated correlation value is compared with a high judgment threshold and a low judgment threshold, based on a comparison result, the stepping length of synchronization success counting in the capturing process is determined, and frequency hopping signal synchronization is achieved in combination with an M / N synchronization judgment strategy. By adopting the scheme of the invention, the problems of difficulty in synchronous acquisition, low synchronous speed and the like under the conditions of broadband interference, narrowband interference and the like can be effectively improved.

The invention discloses a Ku wave band star chain downlink signal interference suppression method, system, equipment and medium, and relates to the technical field of wireless communication signal processing, the method comprises the following steps: firstly, receiving an OFDM signal from a star chain system, segmenting the OFDM signal, and carrying out fast Fourier transform on segmented signals to convert the segmented signals into a frequency domain; obtaining a frequency domain signal; then, performing preliminary narrowband interference frequency positioning on the frequency domain signal by using an FCME algorithm to obtain an interference range; and furthermore, a frequency deviation value is calculated by using the interference frequency determined by the DTFT, then frequency spectrum shifting is performed on the frequency domain signal according to the frequency deviation value, and interference alignment is completed through frequency spectrum shifting, so that interference suppression on the Ku-band star chain downlink signal is realized under the condition of avoiding frequency spectrum leakage.

The invention discloses a 5G microwave amplifier performance test method based on automatic spectrum analysis, and relates to the technical field of data analysis, by introducing a disturbance excitation and recovery behavior comparison mechanism, the short-time dynamic response of an amplifier spectrum is actively induced, the point-by-point difference of a reference spectrum, a disturbed spectrum and a recovery spectrum is analyzed, and the performance of a 5G microwave amplifier is tested. A response-recovery ratio indicator is constructed to identify a local indentation region that is difficult to perceive in the steady-state spectrum. Compared with a traditional method depending on a frequency spectrum smoothing strategy, the method has the advantages that the problem of slight indentation in a high-frequency bandwidth is easy to cover, specific frequency point response is excited through frequency perturbation, power fluctuation or narrow-band interference, and the disturbance response and recovery capability difference of the amplifier become an evaluation basis; therefore, the recognition accuracy of nonlinear response and early failure characteristics is improved, and the stability pre-judgment capability of the 5G amplifier is enhanced.

The invention provides an anti-interference method and device applied to low-frequency communication, and belongs to the technical field of wireless communication anti-interference, and the method comprises the steps: obtaining a received signal, carrying out the time domain windowing processing, then carrying out the fast Fourier transform, converting the received signal from a time domain to a frequency domain, obtaining an initial frequency domain signal, and transmitting the initial frequency domain signal to a receiver; then, the amplitude response of the filter is used as a standard template to be matched with the power spectrum estimation of the initial frequency domain signal, and under the condition that the power spectrum of the filtering signal exceeds a preset threshold value of the matching template, the frequency point is determined as interference, and an interference detection result is obtained; according to an interference detection result, carrying out notch processing on the initial frequency domain signal so as to carry out accurate suppression on a detected interference frequency point and obtain a target frequency domain signal; after the frequency domain processing is completed, inverse fast Fourier transform and time domain reconstruction are carried out on the target frequency domain signal to obtain a reconstructed target signal, so that frequency domain narrowband interference suppression is realized, and the quality and real-time performance of signal processing are remarkably improved.

The invention belongs to the technical field of discharge noise processing, and particularly relates to a staff noise reduction method for partial discharge of an ethylene propylene rubber cable. Comprising the following steps of: 1, processing a periodic narrow-band interference signal by adopting an energy ratio method, and removing the narrow-band interference in a partial discharge signal; 2, reprocessing the processed point signal by adopting a generalized S transformation mode; carrying out modular matrix algorithm transformation on the high-frequency partial discharge signal; 3, setting a basic value gamma by adopting a smaller threshold method, and obtaining the number of all narrowband interferences; 4, acquiring effective data of the center frequency; 5, wave crest data below the standard curve are set as interference frequency data, and the wave crest value is an interference wave crest; 6, extracting frequency peak values corresponding to all narrowband interference signals in the atlas according to the interference peak definition; and 7, setting a frequency spectral line corresponding to the peak value as kp. The method is more thorough in noise processing and has good application value.

The invention discloses a method for improving OCT (optical coherence tomography) axial and transverse resolution, and belongs to the field of deep learning and signal processing. The method comprises the following steps: step S31, acquiring narrowband interference spectrums of different wavebands of the same object by using a variable waveband light source module, and filling a gap region by using a trained spectrum gap filling neural network to obtain a broadband wave number-depth domain interference spectrum; performing short-time inverse Fourier transform to obtain a broadband wave number domain interference spectrum, and finally performing fast Fourier transform to obtain an axial high-resolution A-Line; and S32, transversely splicing the axial high-resolution A-Line obtained in the step S31 to obtain a transverse low-resolution cross section, inputting the trained conditional diffusion model to generate a transverse high-resolution cross section, and obtaining a high-resolution three-dimensional OCT image. According to the invention, the imaging quality can be improved without hardware upgrading, and the axial and transverse resolution can be obviously improved in a low-cost manner.

The present application provides a method and system for estimating the depth of a deep-sea sound source based on two interference time intervals. The method includes the following steps: First, in the deep-sea environment, a single hydrophone at a depth near the sea surface is used for continuous observation and the depth where the receiving array element is located is recorded. Second, for the target radiated noise signal, time-frequency analysis is performed on the signal collected by the hydrophone, and two interference time intervals are extracted according to the narrowband interference structure presented by the LOFAR spectrum, or for the target active pulse sound signal, two interference time intervals are extracted through the change curves of two types of multi-path time delays with time. Then, the ratio of the two interference time intervals is calculated to initially estimate the depth of the sound source. Finally, the depth estimation result of the sound source is corrected using the distance information of the interference cancellation point. This method is applicable to broadband sound sources and narrowband sound sources. The advantage of the present application is that the depth of a narrowband sound source can be estimated using the beam signal output by a single hydrophone or a single horizontal array.

The present invention provides a method, device and equipment for detecting narrowband interference signals in spread spectrum signals. The method comprises: dividing the main lobe bandwidth of the spread spectrum signal into an even number of sub-bandwidths on average; dividing all the sub-bandwidths on average into two groups based on the arrangement order of each sub-bandwidth after division to obtain a first sub-bandwidth set and a second sub-bandwidth set; adding power spectra belonging to the same sub-bandwidth to obtain the power of each sub-bandwidth; making one-to-one correspondence between each sub-bandwidth of the first sub-bandwidth set and the second sub-bandwidth set based on the arrangement order of each sub-bandwidth in the first sub-bandwidth set and the second sub-bandwidth set to obtain a plurality of sub-bandwidth groups; determining the power of the corresponding sub-bandwidth group based on the power of each sub-bandwidth in each sub-bandwidth group; detecting the narrowband interference signal based on the power of each sub-bandwidth group, thereby accurately detecting the narrowband interference signal and avoiding the technical problem of misdetection of the narrowband interference signal in the spread spectrum communication system.

The present disclosure discloses a wireless communication method, a wireless device and a computer storage medium. The wireless communication method includes generating a protocol data unit PPDU and performing a frequency domain resource duplication on the protocol data unit PPDU in units of a resource unit RU to obtain a final protocol data unit PPDU. This method can effectively solve the problem of narrowband interference caused by HB BLE devices to wireless devices.

Methods, devices, and systems for mitigating the impact of high power narrowband interference on hybrid automatic repeat request (HARQ) performance in URLLC systems. In a first aspect, this application relates to implementation of frequency bundled transmissions (FBT) that may enable a device to transmit different individual redundancy versions (RVs) of the same uplink data for multiple preconfigured frequency resources simultaneously or near simultaneously. In a second aspect, the application relates to implementation of FBT with frequency domain repetition, which may enable a device to transmit a redundant version bundle of the same uplink data simultaneously or near simultaneously on multiple pre-configured frequency resources.

The present application discloses a signal anti-interference method, device, equipment, and storage medium, including: acquiring a signal to be processed, performing time-domain to frequency-domain conversion and data windowing processing on the signal to be processed to obtain a preprocessed signal; performing inverse frequency-domain filtering processing on the preprocessed signal to obtain a filtered signal; processing the filtered signal according to a frequency-domain interference suppression algorithm to obtain an anti-narrowband interference signal; performing forward interference signal elimination processing on the signal to be processed to obtain a processed anti-spoofing interference signal; processing the signal to be processed according to the narrow correlation delay lock loop method to obtain an anti-multipath interference signal; performing fusion processing on the anti-narrowband interference signal, anti-spoofing interference signal, and anti-multipath interference signal to obtain an anti-interference signal. It can comprehensively enhance the signal anti-interference ability, cope with various interferences by integrating multiple processing means, adapt to complex interference scenarios, and ensure stable and reliable signal transmission.

When an OFDM radio system which uses a wide frequency band is interfered with by another narrow-band radio system, the interference can frequently be compensated but the transmission quality decreases drastically. Thus, narrow-band interferers in an OFDM radio system are determined according to the invention whereby none of the subscribers of the radio system transmits in a defined time slot or scan slot but all switch at the same time into the receiving mode. If there is interference (P1, P2), it is detected in this time slot. Countermeasures are taken individually in all the mobile devices, in particular the detection of the frequency and strength of the narrowband interference (P1, P2) and the configuration of a flexible notch filter (140) in the time range to the detected frequency and strength. The scanned received signal (RXS) is then filtered in the time range, i.e. before the FFT (120) and the OFDM channel estimation (130) by the correspondingly configured notch filter (140). The notch (S1, S2) of the notch filter thereby acts in the transmission function like a natural break when receiving data.

The embodiment of the present disclosure discloses a power line communication narrowband interference detection and suppression device, method and chip, and relates to the technical field of power line communication. The device comprises: a narrowband detection and suppression unit acquires an OFDM signal and synchronization state information; when it is determined that the current state of the channel is an idle state based on the synchronization state information, the OFDM signal is detected in a parallel mode, a first detection result is obtained and sent to a master control unit; in response to the working mode being switched to a series mode, narrowband interference suppression is performed and the suppressed OFDM signal is detected, a second detection result is obtained and sent to the master control unit; the master control unit receives the first detection result and the second detection result; when it is determined that there is narrowband interference based on the first detection result, the working mode of the narrowband detection and suppression unit is switched to the series mode; and whether the narrowband interference disappears is determined based on the second detection result. The accurate detection and suppression of narrowband interference are realized by a simple device with low performance requirements.

This invention relates to the field of smart meter communication data acquisition technology, and discloses a method for anti-interference data acquisition in smart meter communication based on multi-carrier modulation technology. The method includes using multi-carrier modulation to perform frequency division processing on the signal during data transmission, combining channel state perception and dynamic subcarrier allocation strategies to avoid interference frequency bands in real time, and enhancing data robustness through time-frequency joint coding. This application can effectively suppress narrowband interference and impulse noise, improving the communication reliability and data acquisition accuracy of smart meters in complex electromagnetic environments.

This invention addresses the problem that the direct zeroing method used in existing satellite navigation signal processing frequency domain FFT notch filtering easily leads to power loss near interference frequencies, affecting signal integrity. It proposes a narrowband interference suppression system and method for BeiDou navigation. The narrowband interference suppression system includes a BeiDou RF front-end module, a high-speed ADC sampling module, a digital down-conversion (DDC) module, a signal distributor and buffer module, an interference detection and parameter estimation unit, an interference suppression execution unit, a baseband correlation and demodulation module, and a navigation and positioning result output module. A cascaded array of IIR notch filters is constructed using a cascaded array module. A steep transition band is achieved through small-order serial units, and the stopband width of the notch filters can be flexibly adjusted via a convergence factor. This enables precise suppression of extremely narrow stopband interference at different bandwidths, filtering out signals only at interference frequencies, effectively avoiding impact on surrounding useful BeiDou signals and preventing spectrum leakage.

Methods are described for ensuring robust S-SS / PSBCH blocks (S-SSBs) reception on the sidelink in the presence of high-power narrowband interference include frequency hopped S-SSB transmission to mitigate high-power narrowband interference such that if one frequency location of S-SSBs is corrupted by the high-power narrowband interference, the other frequency location(s) of the S-SSBs may not be affected.

The invention discloses a self-adaptive narrowband interference suppression method and device for power line communication, and the method comprises the following steps: S1, receiving a mixed signal, and carrying out the decorrelation processing of the mixed signal, so as to obtain a decorrelation signal; s2, inputting the decorrelated signal into a filter, and estimating the narrowband interference signal at the current moment by the filter according to the filter coefficient at the current moment to obtain a narrowband interference estimation signal; s3, calculating the energy of the decorrelation signal; s4, subtracting the received signal at the current moment from the narrowband interference estimation signal to obtain an error signal; and S5, according to the filter coefficient at the current moment, the error signal and the energy of the decorrelation signal, calculating the filter coefficient at the next moment by using a power normalized least mean square algorithm, so that the algorithm maintains the characteristic of insensitivity to the power change of the input signal, the calculation resource consumption is greatly reduced, and the calculation efficiency is improved. And the feasibility and efficiency of the algorithm in practical application are improved.

A wireless transmit receive unit (WTRU) and methods for mitigating narrowband interference on sidelink communications are disclosed. A method performed by the WTRU may include: receiving sidelink control information (SCI) including information indicating at least one alternative transmit resource pool (TxRP) different from the TxRP of the received SCI, and reserving resources on the at least one alternative TxRP according to the information indicated in the SCI. the method may include receiving at least one of a PSCCH transmission or a PSSCH transmission, via the reserved resources, for a Hybrid Automatic Repeat Request HARQ transmission or a HARQ retransmission, and transmitting a PSFCH signal for HARQ feedback on the at least one alternative TxRP or the TxRP of the received SCI.

The invention relates to the technical field of signal detection, and discloses a radar interference detection method based on frequency spectrum statistical distribution characteristics, and the method comprises the steps: employing the difference between the frequency spectrum distribution characteristics of a pure echo signal and an interference echo signal, and enabling the pure echo signal to deviate from the fitting Rayleigh distribution through the broadband interference, and achieving the radar interference detection. The broadband interference and the narrowband interference can destroy the Gaussian property of the frequency domain, so that the broadband interference and the narrowband interference can be detected at the same time, certain complementarity is formed by using Z-score and JS divergence detection, and the threshold value is automatically set by adopting quartile, so that a large amount of manual experiments are saved to obtain the accurate threshold value, and the detection accuracy is improved. The method is more suitable for variable electromagnetic environments, and compared with an experimental mode of a neural network, the time for manually marking the data set is saved under the condition that the correctness is not reduced.

Methods are described for ensuring robust S-SS / PSBCH blocks (S-SSBs) reception on the sidelink in the presence of high-power narrowband interference include frequency hopped S-SSB transmission to mitigate high-power narrowband interference such that if one frequency location of S-SSBs is corrupted by the high-power narrowband interference, the other frequency location(s) of the S-SSBs may not be affected.

The application relates to a miniaturized satellite navigation receiver, which receives three constellation navigation satellite signals of GPS, GLONASS and BD second-generation B1 through a first electric connector, receives a BD second-generation B3 constellation navigation satellite signal through a second electric connector, and respectively carries out filtering, frequency mixing and down conversion to a baseband, and through an A / D analog-digital converter, the down-converted analog-digital conversion is sent to an FPGA; the FPGA realizes capturing and tracking of the above three navigation signals, and after frequency domain narrowband interference resistance processing of another frequency point navigation signal, the FPGA realizes capturing and tracking again, the FPGA sends demodulated original data to a DSP, the DSP carries out navigation calculation, and a data stream is transmitted through an interface circuit, the receiver realizes reduction of the volume of the satellite navigation receiver, realizes miniaturized design, has strong anti-interference capability, the FPGA has large design resources, and the performance of the satellite navigation receiver is greatly improved.

The invention relates to the technical field of signal processing, in particular to a radio frequency signal adaptive processing method and device, a reader-writer and a storage medium, and the method comprises the steps: obtaining a radio frequency signal, and detecting whether the radio frequency signal has an interference event; under the condition that the interference event exists, calculating a time domain feature and a frequency domain feature of the radio frequency signal, and judging whether the interference event is metal multipath fading or not based on the time domain feature and the frequency domain feature to obtain a first result; calculating the signal characteristics of the radio frequency signal, and determining the interference source type of the interference event based on the signal characteristics to obtain a second result, the interference source type at least comprising metal multipath fading, narrowband interference and broadband noise; determining a target optimization strategy from a preset strategy library according to the first result and the second result; and processing the radio frequency signal based on the target optimization strategy. According to the invention, the radio frequency signal can be optimized according to the environment change, so that the processing quality of the radio frequency signal is improved.

The utility model provides a Beidou No.3 miniaturized Beidou positioning communication device and communication equipment. The device comprises a clock circuit, a power supply circuit, and a radio frequency front-end circuit, a radio frequency chip, a baseband chip and an interface circuit which are connected in sequence, the power supply circuit is connected with the clock circuit, the radio frequency front-end circuit, the radio frequency chip, the interface circuit and the baseband chip, and the clock circuit is connected with the baseband chip; the radio frequency front-end circuit comprises a signal receiving circuit and a signal transmitting circuit which are connected with a radio frequency chip; the signal receiving circuit comprises a first receiving channel and a second receiving channel, the first receiving channel is used for receiving a B3 intermediate frequency signal of the Beidou RNSS, and the second receiving channel is used for receiving an S intermediate frequency signal of the RDSS; the signal transmitting circuit is used for transmitting a first radio frequency signal received from the radio frequency chip to the antenna so as to transmit the first radio frequency signal. The integrated design of the RNSS and the RDSS can be realized, and the RNSS signal is supported to resist narrowband interference and forwarding deception interference.

The invention discloses a digital automatic gain control structure in a power line carrier communication receiving process, relates to the technical field of power line carrier communication, solves the technical problem that narrowband interference has a great influence on accurate evaluation of signal energy, and the key points of the technical solution are to realize rapid adjustment of large signal saturation and accurate counting and analysis of pulse interference through an energy saturation preprocessing unit; to realize detection and suppression of narrowband interference signals in and out of the band through a narrowband interference detection and suppression unit, thereby improving the accuracy of effective signal energy estimation; to realize rapid convergence of a power line carrier signal with continuously changing amplitude through an exponential sliding averager, thereby effectively reducing the jitter of gain adjustment.

The invention provides a narrow-band interference suppression method and system for a direct sequence spread spectrum system, and relates to the technical field of satellite communication anti-interference. The method comprises the following steps: determining the noise power of an obtained receiving signal, wherein the receiving signal is a frequency domain signal; determining an interference threshold according to the noise power of the received signal; determining an interference signal and an interference parameter thereof according to the interference threshold; and according to the interference parameter, performing interference filtering on the received signal through a high-pass filter to obtain a signal after interference suppression. According to the method, interference parameters can be accurately estimated in a frequency domain, the most matched high-pass filter is determined according to the determined interference parameters, interference is filtered through the high-pass filter to obtain the signal after interference suppression, the suppression capability of the direct sequence spread spectrum system on strong narrow-band interference can be remarkably improved, the complexity of the mode is greatly reduced, and the method is suitable for large-scale popularization and application. And the practicability is higher.

The present invention relates to a spectrophotometer and a detection method for automatic batch detection of narrowband interference filters, characterized in that: an incident slit is provided on a light-shielding cover, a quartz window plate is provided at the entrance of the incident slit, a light source is provided in front of the quartz window plate, a dispersion element and an optical path are arranged side by side in the light-shielding cover, a collimating mirror is provided opposite to the dispersion element, an objective lens is provided opposite to the optical path, an exit slit is provided at the entrance of the optical path, a semi-transmissive and semi-reflective mirror and a first detector are axially arranged in sequence in the optical path, an X-direction parallel moving track is provided below the light-shielding cover, a Y-direction parallel moving track is slidably arranged thereon, a porous filter holder is slidably arranged on the Y-direction parallel moving track, a Y-axis pitching attitude control mechanism and an X-axis pitching attitude control mechanism are provided at its bottom end, and a second detector is provided at the top end of the X-axis pitching attitude control mechanism. The present invention realizes automatic detection of perpendicularity and consistency of perpendicularity.