58 results about "Narrowband interference" patented technology

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 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.

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 provides a power Internet of Things communication method and device, and the method comprises the steps: dynamically distributing a frequency hopping point for each sub-channel in each bit interval at a transmitting end, enabling the frequency of a sub-carrier borne by data to jump along with time, enabling the subsequent transmission to automatically jump to other frequency points even if a specific frequency band is interfered at a certain moment, and enabling the transmission efficiency to be improved. Therefore, narrowband interference is actively avoided; meanwhile, after a receiving end detects that the current micro-slot transmission fails, retransmission is triggered immediately in the next available micro-slot without waiting for a traditional scheduling period, and retransmission data is mapped to a new frequency point in combination with a frequency hopping mechanism, so that continuous retransmission failure caused by continuous existence of interference is effectively avoided, accumulated retransmission time delay is remarkably shortened, and the transmission efficiency is improved. And reliable transmission is ensured to be completed in a time delay window allowed by the service.

Techniques are provided for overcoming narrowband interference with notch filters. An example method for determining, with a receiver, a distance to a satellite vehicle includes receiving a signal from the satellite vehicle, determining one or more notch filter configurations, determining a pseudo-random noise code and a Doppler frequency associated with the signal, determining a code phase correction value based at least on the one or more notch filter configurations, the pseudo-random noise code, and the Doppler frequency, and calculating the distance to the satellite vehicle based at least in part on the signal and the code phase correction value.

The method comprises the following steps: converting an original symbol from a time delay Doppler domain into an intermediate domain at a transmitting end of an orthogonal time-frequency-space system, carrying out interleaving processing, converting a received signal from a time domain into the intermediate domain after a receiving end receives the signal, detecting a peak value of an element in the symbol in the intermediate domain at the receiving end, and calculating frequency offset according to an intermediate domain index corresponding to the peak value, so as to obtain the frequency offset of the orthogonal time-frequency-space system. Performing frequency compensation on the received signal; converting the compensated receiving signal from a time domain to an intermediate domain to execute interference detection, performing zero setting processing on a detected interference element, converting the interference element into the time domain, recovering the interference element to an original frequency, converting the interference element into the intermediate domain, performing de-interleaving processing, converting the interference element into a time delay Doppler domain from the intermediate domain to obtain an original symbol, and outputting the original symbol. And narrowband interference suppression of the orthogonal time-frequency-space system is realized. The OTFS narrowband interference suppression method can realize OTFS narrowband interference suppression under the condition of no prior information, and can obtain an effective interference suppression effect under different signal-to-interference ratio conditions.

A wireless transmit receive unit (WTRU) and methods for enhancing PUSCH frequency hopping transmission in the presence narrowband interferes are disclosed. The method may include: by a network element, determining an interference signal, determining the interference signal is equal to or greater than a threshold value, determining one or more WTRUs capable of incurring the interference signal at a level equal to or greater than the threshold value, generating information indicating PRB exclusion, generating a signal to trigger the PUSCH frequency hopping with PRB exclusion; and, by one or more WTRUs, receiving the information indicating the PRB exclusion, storing the information indicating the PRB exclusion, receiving the signal to trigger the PUSCH frequency hopping with PRB exclusion, retrieving a most recently stored information indicating the PRB exclusion when the signal to trigger the PUSCH frequency hopping with PRB exclusion is received, and transmitting a frequency hopping PUSCH with PRB exclusion.

The application discloses a wireless communication method, a wireless device and a computer storage medium, and the wireless communication method comprises the following steps: generating a protocol data unit (PPDU); and performing frequency domain resource replication on the PPDU in a resource unit (RU) to obtain a final PPDU. The method can effectively solve the problem of narrowband interference of an HB BLE device on a wireless device.

The invention relates to the technical field of frequency hopping communication anti-interference, and discloses a frequency domain narrowband interference suppression threshold correction method and system. The method comprises the following steps: cutting off a zero intermediate frequency time domain signal according to N points and carrying out fast Fourier transform to obtain a spectrum data sequence, calculating a spectrum mean value and multiplying the spectrum mean value by a threshold factor to obtain an initial threshold value sequence, correcting by comparing a ratio of a current threshold value to a previous cache threshold value, judging and zeroing an interference frequency point according to the corrected threshold value, and outputting a time domain signal through inverse fast Fourier transform. According to the method and the device, the problems of interference missing detection and useful signal misjudgment caused by threshold value fluctuation at the moment of frequency hopping switching are solved, and the accuracy and the stability of frequency domain narrowband interference suppression are improved.

The application discloses a laser air speed tube device based on Rayleigh scattering laser radar and belongs to the field of laser remote sensing, which comprises an outgoing light path composed of a pulsed fiber laser, a first beam splitter, a beam expander and a launching barrel; a receiving light path comprising an arranged telescopic receiving system, a 2*1 polarization maintaining fiber coupler, a collimating lens, a narrowband interference filter, a polarization beam splitter prism and an F-P etalon, one output of the F-P etalon being provided with a first focusing lens, a second beam splitter and a first signal channel detector, and the other output of the F-P etalon being provided with a third focusing lens, a third beam splitter and a first signal channel detector; and a close-range signal detection light path comprising a common receiving section light path between the 2*1 polarization maintaining fiber coupler of the receiving light path and the second beam splitter and the third beam splitter; the first focusing lens is arranged between the first beam splitter beam splitting light path and the 2*1 polarization maintaining fiber coupler; and the first and second close-range signal detectors are arranged at the rear of the second and third beam splitting light paths respectively.

This invention provides an active suppression method and system for background noise of partial discharge (PD) UHF signals. The method includes: determining the placement positions of a UHF sensor and a noise sensor on the outer wall of a GIS (Gas-Insulated Structure) device; acquiring the mixed noise PD signal using the UHF sensor; acquiring the noise signal using the noise sensor after determining the minimum acquisition period; inputting the acquired noise signal into a spectrum analyzer for spectrum analysis; extracting the obvious narrowband noise frequency band in the frequency domain, determining its frequency band and phase jitter; and actively suppressing narrowband noise in the frequency band where narrowband noise exists using a narrowband noise interference suppression formula. This invention solves the technical problem of poor applicability to narrowband interference from PD UHF signals of GIS equipment in field environments, which restricts the accuracy and reliability of interference suppression.

A wireless transmit receive unit (WTRU) and methods are disclosed for mitigating narrowband interference on sidelink communications. The method may include: receiving, at a WTRU, SCI, the SCI including information indicating at least one alternative TxRP different from the TxRP used for SCI is transmission, reserving, at the WTRU, resources on the at least one alternative TxRP according to the information indicated by the received SCI; and transmitting, by the WRTU, at least one of: a PSCCH, and a PSSCH, alone or in combination, via the reserved resources for a Hybrid Automatic Repeat Request HARQ transmission or HARQ retransmission, or a PSFCH for HARQ feedback, on the at least one alternative TxRP. The method may also include determining a rank of PSSCH transmission based on a CSI-RS, determining to apply PSSCH layer aggregation according to a channel quality when the determined rank is greater than 1.

The invention relates to the technical field of radio compass angle resolving, in particular to an automatic gain control radio compass angle resolving method, which comprises the following steps of: introducing two-stage automatic gain control through a complete process of signal acquisition, digital-to-analog conversion, frequency domain conversion, two-stage gain control, frequency conversion and azimuth angle calculation; the first-stage gain control realizes feedback control based on a frequency domain judgment result, and narrow-band interference and pulse noise in a frequency domain can be filtered in a targeted manner; the second-stage gain control realizes fine gain adjustment based on time domain signal amplitude judgment, and further stabilizes the signal amplitude; meanwhile, through the synergistic effect of two-stage gain control, subsequent frequency conversion and resolving links can be carried out based on stable and clean signals, the resolving process is simplified, resolving errors caused by signal interference are avoided, high-precision resolving of the azimuth angle is achieved, the overall process logic is clear, engineering implementation is easy, and the method is suitable for large-scale popularization and application. The method is suitable for aviation navigation and other scenes with high reliability requirements.

The invention discloses a cable partial discharge signal denoising method based on RSVD and an improved wavelet packet threshold method. The cable partial discharge signal denoising method comprises the following steps: decomposing a noisy partial discharge PD signal into K IMF components through CEEMDAN; constructing Hankel matrixes for the IMF components one by one, decomposing the Hankel matrixes through random singular value decomposition RSVD, then performing zero setting on singular value abrupt change components, and eliminating narrowband interference; by calculating and comparing cross correlation coefficients of the IMF components, selecting a proper feature component closest to an original signal; and reconstructing the feature components obtained by screening, and eliminating the residual white noise in the superposed signal by adopting a wavelet packet threshold function method of an improved threshold function to obtain a new partial discharge PD signal. According to the method, the effects of extracting the signal-to-noise ratio and the waveform reduction degree of partial discharge PD are good, and the calculation efficiency is better than that of a singular value decomposition SVD algorithm.

Capacitive seat occupancy detection and classification system (16), in particular vehicle seat occupancy detection and classification system (16), comprising an impedance measurement circuit (18) and a control and evaluation unit (30), characterized in that the impedance measurement circuit (18) comprises the following: - a signal voltage source (20) designed to apply periodic electrical measurement signals to an output terminal (22), wherein a capacitive sensor (36) can be electrically connected to the output terminal (22) to receive the electrical measurement signals, and wherein the signal voltage source (20) is designed to generate periodic measurement signals of N different fundamental frequencies, where N is a natural number of at least 3, - a sensing current measuring circuit (24) designed to determine complex sensing currents generated in the capacitive sensor (36) by the provided periodic measurement signals of at least N different fundamental frequencies, - a signal processing unit (26) designed to to determine a complex impedance from each of the specified sensing currents with reference to a complex reference potential, and to provide output signals (28) that are representative of the complex impedances that have been determined at at least N different fundamental frequencies, and that the control and evaluation unit (30) is designed to to receive the output signals (28) provided by the signal processing unit (26), to compare each of the complex impedances that have been determined at at least N different fundamental frequencies with predetermined threshold values, based on the result of the comparison, to determine a seat occupancy class for each of the complex impedances that have been determined at at least N different fundamental frequencies and to determine a final seating class derived by a majority decision from the seating classes determined for each of the complex impedances determined at one of the at least N different fundamental frequencies, where N is equal to [(2 xn) + 1], where n is a natural number greater than 1, representing the number of potential resonances or electromagnetic (EM) narrowband interferences.

A method implemented by a Wireless Transmit / Receive Unit (WTRU) is disclosed. The method may include mapping resource allocation information for data transmission to a set of virtual resource block bundles. The method may further include mapping the set of virtual resource block bundles to a set of first physical resource block bundles based on a first mapping function. Additionally, the method may include mapping the set of first physical resource block bundles to a set of second physical resource block bundles. The second physical resource block bundle set may include both the first and second physical resource block bundles. The first physical resource block bundles may be usable for data transmission, while the second physical resource block bundles may not be usable for data transmission.