149results about How to "Good interference suppression effect" patented technology

The invention provides an OFDM (Orthogonal Frequency Division Multiplexing) system inter-cell interference elimination method based on IDMA (Interleave-Division Mutiple-Access), which comprises the following steps of: distinguishing different cell base station transmitters by configurations of different interleavers; and classifying all the base stations except a T-BS (Target cell Base Station) into an S-BS (Strong interference Base Station) and a W-BS (Weak interference Base Station) according to strength of interference signals by a mobile user receiver, wherein a signal of the W-BS is processed as a gaussian noise, a signal of the T-BS and a signal of the S-BS are detected in iteration, therefore interference outside the T-BS can be suppressed and estimate data of the T-BS can be obtained. The OFDM system inter-cell interference elimination method based on IDMA, provided by the invention, has the advantage of excellent interference suppression performance gained from iteration.

The embodiment of the invention provides an interference processing method and device, relating to the technical field of communication and invented for improving the sensitivity of interference processing and the inhibition performance on interference. The interference processing method comprises the following steps of: determining an interference coordination solution used by an interference base station from a pre-set set of the interference coordination solutions, wherein the set of the interference coordination solutions comprises at least two interference coordination solutions; and carrying out the interference processing according to the interference coordination solution used by the interference base station. The interference processing method and device, provided by the embodiment of the invention, can be used in a wireless communication system.

The invention provides a voice recording method and system based on an annular microphone array. The method comprises the following steps: acquiring a voice signal in real time through the annular microphone array, wherein the annular microphone array comprises multiple microphones; converting the voice signal into a frequency domain signal; performing sector division on a space corresponding to the annular microphone array to form multiple sector regions containing at least one microphone; generating a fixed beam of each sector region; and self-adaptively adjusting each fixed beam frame by frame so that the influence on the current fixed beam by other fixed beam is minimum, and the voice signal at each fixed beam direction is obtained; and recording the voice signal at each fixed beam signal. By use of the voice recording method and system provided by the invention, a problem that the signal leakage is excessive in other direction is reduced, and the use experience effect is improved.

The invention discloses a cable fault detection and analysis method. According to the method, an impedance frequency spectrum and a phase frequency spectrum of a cable are taken as basis, subsection characteristic impedance on an impedance frequency spectrum attenuation trend curve is calculated with a subsection interception method, an equation of equivalent impedance is established, R, L, G and C parameters of cable transmission impedance are calculated, a transmission impedance model based on R, L, G and C parameters is obtained, an error distance graph with a cable distance length serving as a variable is obtained through error calculation and comparison of the transmission impedance model and the tested impedance frequency spectrum and phase frequency spectrum, finally, local zero points on the error distance graph are analyzed, and fault detection and fault type identification are realized. Compared with the prior art, on the basis of a relative signal transmission rate calculation method with low calculation difficulty and high calculation accuracy, accurate fault positioning and multi-point fault positioning can be realized, and the fault type identification can be realized.

The invention discloses a sky-wave beyond visual range radar adaptive space-time joint interference-resistant method which inhibits interference by comprehensively utilizing two methods of adaptive beamforming and interpolation and compensation after a time domain is eliminated and achieves the purpose of making up for each other deficiencies through reasonable scheduling strategies. The transient interference entering a side lobe is resisted by utilizing the adaptive beamforming of a space domain, and the transient interference entering a main lobe is inhibited through the interpolation and the compensation after the time domain is eliminated, therefore compensating errors caused by time domain elimination and beam distortion caused by main lobe interference are prevented; and a diagonal loading amount which is in proportion to interference strength is formed for the non-transient interference entering the main lobe through interference space distribution information, therefore the strong main lobe interference is prevented from causing the serious distortion of the shapes of adaptive beams. The invention is established on the basis of a dimension-reducing beam space adaptive beamforming method, thereby greatly reducing the amount of signal processing calculations; and concrete steps are seen in an attached figure. The invention is not limited to a sky-wave beyond visual range radar system, can be widely applied to large-sized phased array radars of multiple types and has popularization and application value.

The invention provides an SAR radio frequency interference suppressing method. The technical scheme is that a range line echo signal of SAR data is taken as the input, a phase space matrix is constructed according to the echo signals and a phase space matrix of a reference signal is obtained by utilizing a space projection method; restoring a one-dimensional reference signal from the phase space matrix of the reference signal by adopting an opposite angle equalizing method; determining the judgment threshold of an interference signal according to the reference signal; determining interference frequency points in echoes according to the determined interference judgment threshold and implementing the radio frequency interference suppression of the range line by using the amplitude mean value of the reference as a substitute. By adopting the method provided by the invention, the SAR image quality can be improved effectively after interference suppression.

The invention relates to the communication technical field, and discloses an interference suppression method and a device embodiment. The method includes the following steps that: interference characteristic data of an interference digital signal is acquired, according to an interference detection threshold corresponding to the current interference digital signal which is waiting for processing; an interference suppression processing is performed to the interference digital signal, according to the acquired interference characteristic data. The device comprise an interference detection unit which is used for acquiring the interference characteristic data of the interference digital signal according to the interference detection threshold corresponding to the current interference digital signal which is waiting for processing; and an interference suppression unit which does the interference suppression processing to the interference digital signal according to the interference characteristic data. The invention also discloses an embodiment of a receiver. The embodiment of the invention can improve the accuracy of the interference detection, thereby improving the effect of the interference suppression.

The invention discloses a baseband signal frequency domain narrowband interference detection elimination apparatus and a method thereof. The method comprises the following steps that an intermediate frequency signal is divided into two paths and is output to a narrowband interference detector and a narrowband interference eliminator respectively; the narrowband interference detector carries out interference detection on one path of the received intermediate frequency signal so as to obtain interference detection information and sends the information to the narrowband interference eliminator. The narrowband interference eliminator carries out narrowband interference elimination processing on the other path of the received intermediate frequency signal according to the interference detection information. By using the narrowband interference detector provided in the invention, whether narrowband interference exists can be detected and index information of an interference frequency point can be provided so that the narrowband interference eliminator only carries out frequency domain filtering on the frequency point with interference. By using the apparatus and the method in the invention, a good narrowband interference restraining effect is possessed, system power consumption can be reduced and high practicality is possessed.

The invention discloses an electromagnetic wave absorbing body-based high-isolation array antenna, which comprises a metal bottom plate, wherein four element antennas are vertically arranged on the metal bottom plate, are symmetrically distributed relative to the center of the metal bottom plate and rotate 90 degrees in sequence; an electromagnetic wave absorbing body unit formed by electromagnetic wave absorbing walls is arranged on two vertical axes of the metal bottom plate; each electromagnetic wave absorbing wall is of a double-sided structure and comprises two layers of electromagnetic wave absorbing plates which are laminated back to back; a plurality of evenly spaced microstrip structures are arranged at the front side of each electromagnetic wave absorbing plate; and each microstrip structure comprises a cross-shaped microstrip patch and square annular microstrip lines arranged at the outer side of the cross-shaped microstrip patch. The antenna is applied to a Beidou satellitenavigation system; and spatial electromagnetic waves, close to a factory, of the element antennas are absorbed through the electromagnetic wave absorbing body unit, so that coupling of the spatial waves between the element antennas is reduced and the isolation between the element antennas is improved.

This invention provides an interference suppression equipment and method used in the wireless communication system, in which the said method includes the following steps: (1) the base station detects the uplink interference and the noise power; (2) based on the detection results, determine whether there is interference, and if interference and noise power over system tolerance threshold, there is interference; (3) if there is interference, the base station automatically adjusts its own receiving sensitivity; (4) by the closed-loop power control of the base station, adjust the terminal's transmission power. This invention can improve the system interference suppression capability, particularly more significant for the capacity upgrade and application environment expansion of the CDMA system whose system capacity is limited by itself interference restriction.

The invention provides a range finder impulse interference suppression method combining direction of arrival (DOA) estimation and main beam forming. The method comprises the steps that received radio-frequency signals from an array antenna are converted into analog baseband signals; the analog baseband signals are converted into digital baseband signals; the number of the radio-frequency signals and coming-direction information of the radio-frequency signals are analyzed through an estimator; beam forming weights of the coming directions of the digital baseband signals of all the paths are obtained through a linear constraint minimum variance beam forming method, and main beam forming is carried out; orthogonal frequency division multiplexing perpendicular incidence path signals are obtained according to signals, obtained after main beam forming, of all the paths; the Doppler frequency offset values of the received signals are estimated, and Doppler frequency offset compensation is carried out; cyclic prefixes are further removed, conversion is carried out so that frequency domain signals can be obtained, the frequency domain signals are sent to a balancer after being processed through quadruple sampling, signals output by the balancer pass through a demodulator, a deinterleaver and a decoder in sequence so that an estimated value of a sent bit sequence can be obtained. According to the range finder impulse interference suppression method combining DOA estimation and main beam forming, the linear constraint minimum variance beam forming method can be directly utilized for weighting the array-received signals, and range finder impulse signals can be suppressed.

The invention discloses a method for allocating time-frequency resources in an orthogonal frequency division multiplexing system and a system thereof. The method comprises the following steps: the quantity N of cells contained by each cluster and the quantity S of sectors contained by each cell are determined; usable time-frequency resources are divided into N*S time-frequency resource block groups; the N*S time-frequency resource block groups are allocated to the vectors of the cells by allocating the time-frequency resource block groups to the vectors for many times, wherein when the time-frequency resource block groups are allocated for the vectors each time, the time-frequency resource block groups allocated to the vectors are different from each other, allocated time-frequency resources in each sector are different from each other, and the priority level is preset for the time-frequency resources allocated to the sectors from high to low according to the allocation sequence so that base station equipment performs resource scheduling according to the priority level of the time-frequency resources in the vectors. The adoption of the method can aim at the time-frequency two-dimensional characteristic of resource management to perform resource planning and allocation, and strengthen the interference inhibition effect among the cells.

The invention discloses a method and a device for configuring pre-coding weights in cells. The method comprises the steps of: for each user in a plurality of cells, obtaining a first weight of a user based on a maximum signal to leakage noise ratio rule; for each user, obtaining a game function of the user according to the strategy set and the revenue function of the user; for each user, configuring the first weight of the user according to the game function and first weights of other users, causing interference to the user, in the cells, wherein the first weight configured for the user enables the revenue function of the user to be maximum and the configured first weight is used as a precoding weight of the user when the revenue function meets the Nash equilibrium. By adopting the invention, the reasonable precoding weights can be selected based on selection criteria and method of a game theory, a better effect of inhibiting the interference to the users in the cells is obtained, and the problems of poor interference inhibition effect, difficult realization of interference and great influence on the traditional structure in correlation techniques are avoided.

The invention relates an MIMO radar array design method based on non-uniformed subarray partition. The method comprises the steps of firstly, establishing an MIMO radar signal model which comprises an emission array and a receiving array, wherein the emission array comprises M emission array elements and the receiving array comprises N receiving array elements; then partitioning the emission array into K non-uniformed subarrayAj according to non-uniformed partition rule. The non-uniformed subarrayAj comprises mj emission array elements and each non-uniformed subarray bore diameter is different. According to the method, emission array is partitioned into a plurality of non-uniformed subarraies with different bore diameters through non-uniformed subarray partition to achieve a lower subband level and formed by the minimum variance orthoscopic response beam to achieve a deeper nulling, a higher SINR emission and steadier and stronger antijamming capability.

The invention discloses a MIMO radar anti-interference method based on a nested array, aiming to solve the problems of low resolution and low interference suppression capability of a conventional MIMO radar. The method includes 1) acquiring the target return signal; 2) performing snapshot sampling, matching filtering and vectorization on the target return signal successively to obtain vectorized receiving data y; 3) estimating the covariance matrix of y and performing vectorization to obtain an observation vector z; 4) removing the repetitive elements of z, and obtaining the virtual differential array receiving data z1; 5) dividing z1 into N1 subarray receiving data to obtain the received data covariance matrix Rss of rank recovery; 6) obtaining the beamformer weight vector W based on the Rss; and 7) beamforming according to W and enhancing the desired target information and suppressing the interference. The method can effectively improve the resolution of the MIMO radar and suppress the performance of the interference suppression, and can be used to suppress the interference.

In a radio communication system including multiple mobile terminals and multiple radio base stations, the mobile terminal has a function of interference rejection combining. The radio base stations share downlink channel characteristics for mobile terminals connected to radio base stations. The radio base station gives weights to radio waves transmitted from multiple transmission antennas to perform in-phase addition of an interfering radio wave beam directed to a mobile terminal for which the desired radio base station is another radio base station to an interfering radio wave beam transmitted from yet another radio base station for limiting the number of interfering radio wave beams that arrive at the mobile terminal. The radio base station does not perform in-phase addition when the number of interfering radio wave beams of which interference can be suppressed by the mobile terminal is equal to or greater than the number of radio base stations that send interfering radio wave beams to the mobile terminal.

The invention is a Stewart platform active vibration isolation control method based on a backstepping sliding mode technology and belongs to the field of spaceflight. The invention provides the Stewart platform active vibration isolation control method based on the backstepping sliding mode technology in order to solve the vibration isolation problem of a sensitive load. The method comprises the concrete steps of S1, establishing a kinematics and dynamics model of a Stewart platform; S2, calculating the state space of the Stewart platform; S3, designing a backstepping sliding mode controller based on a state space expression; and S4, calculating the stability of the backstepping sliding mode controller The method is advantaged by being high in control precision and good in robustness.

The invention provides a multi-beam directional anti-interference processing method for a satellite navigation reception system. According to the method, at the initial moment, time space anti-interference weight is calculated according to a minimum power algorithm, an output signal is captured and tracked after weight of the time space anti-interference weight, a captured and tracked local signal is taken as an expectation signal to carry out minimum mean squared error calculation to acquire time space wave beam direction weight capable of forming wave beams in a satellite signal direction, after weight processing on the time space wave beam direction weight, the signal is utilized to inhibit compaction interference, moreover, satellite signals are improved, influence of multipath interference can be effectively inhibited, and anti-interference capability of the satellite navigation system is greatly improved. According to the method, wave beam direction for the captured and tracked signal is not only realized, observation on non-captured satellites can be carried out in real time, when situations of satellites change, wave beam direction is updated in real time, the algorithm principle is simple, and the interference inhibition effect is good.

The invention relates to a transform-domain-based narrowband interference inhibiting method in shortwave spread spectrum communication. The method comprises the following steps of performing chip matching filtering, sampling, wavelet packet transformation and filtering on a spread spectrum signal with narrowband interference in shortwave communication; then limiting an amplitude of the transform domain, and performing wavelet packet inverse transformation and lease mean square (LMS) filtering on the signal which is subjected to amplitude limiting; and judging the filtered data to obtain an estimated transmission symbol. By the method, the algorithm offset error is reduced, the algorithm has lower complexity, and the narrowband interference can be effectively located in a certain frequency domain range; and the located 'polluted' frequency range is removed, and then the signal which is subjected to interference inhibition-recovery is synthesized by a wavelet packet. The narrowband interference inhibiting effect is improved in terms of real time property and accuracy.

The invention discloses a motion segmentation method based on mixtures-of-dynamic-textures-based spatiotemporal saliency detection. The method comprises the following steps of: 1, modeling a background by adopting mixtures of dynamic textures; 2, defining a spatiotemporal saliency discrimination function by utilizing a Kullback-Leibler (KL) divergence, and calculating a saliency map; and 3, processing a saliency threshold value to obtain a motion segmentation result. By the method, a motional object can be accurately segmented in a complex environment with a highly-dynamic background and a motional camera; and compared with the conventional method, the invention greatly improves complex scene processing and noise suppression, has relatively higher robustness and can be applied to various complex motion scenes.

The invention discloses a range finder pulse interference suppression method combining orthogonal projection and circular beam forming. The method comprises the following steps: converting radio-frequency signals from an array antenna into analog baseband signals through a radio-frequency front end, converting the analog baseband signals into digital baseband signals through A / D (Analog to Digital) conversion, computing a plurality of digital baseband signals through an orthogonal projection algorithm to obtain a projection matrix of an interference signal orthogonal complementary space, applying the projection matrix to a receiving signal vector to eliminate interference of a range finder pulse signal, further acquiring the beam forming weight vector of the array antenna through a circular beam forming method, performing beam forming on the signal vector of which pulse interference is eliminated, and extracting an OFDM (Orthogonal Frequency Division Multiplexing) direct path signal; and removing a cyclic prefix, converting the OFDM direct path signal into a frequency domain signal through an FFT (Fast Fourier Transform) algorithm, further performing four-time frequency domain down sampling, estimating channel characteristics through a channel, performing channel balance through a balancer, and processing through a demodulator, a deinterleaver and a decoder in sequence to obtain the estimated value of a transmission bit sequence. By adopting the method, the interference of pulse and scattered multipath signals of a range finder can be overcome effectively.

The invention relates to an electric drive, particularly a windshield wiper drive for vehicles, comprising an electric motor (10) in a crucible-shaped, preferably metal, motor housing (14), a gearbox housing (16) that is attached to the motor housing (14), and an arrangement for the interference suppression of the motor (10). According to the invention, at least one choke coil (46, 48) for the interference suppression of the motor (10) is disposed in the transition region from the motor housing (14) to the gearbox housing (16), wherein in this transition region means (36, 56) are provided in order to shield the filtered coil end (47, 49) projecting into the gearbox housing (16) from the interfering radiation produced by the motor (10).

The invention provides a channel estimation and detection method and a base station. The method for channel estimation and detection includes that: time domain signals received by antennas are converted into frequency domain signals by a base station side; multi-UE joint estimation is carried out by the base station side for pilot frequency symbols in the frequency domain signals of multi-UE of multi-cell of Coordinated Multi-Point (CoMP) to obtain a channel estimation result of all UE pilot frequency symbols; a channel estimation result of UE data symbols is obtained by base station side according to the channel estimation result of the UE pilot frequency symbols; jiont equalization is carried out by the base station for the multi-UE of multi-cell to obtain all detection results of the UEs. By the channel estimation and detection method and the base station, requirement for dispatch is lowered, calculation complexity is reduced, interference inhibition capability is enhanced, and demodulation performance for marginal users of a cell is improved, thus throughput of a system is improved.

The invention provides a motor control apparatus capable of improving the performances of both interference suppression and positioning adjustment. A phase advancer (125) is configured to advance the phase of the speed feedback of a motor (110) in order to compensate the phase retardation of the speed feedback of the motor (110) within the high-frequency range. A time constant adapter (130) is configured to multiply the speed feedback difference between the advanced phase and speed commands sent by a computer by a time constant so as to suppress the interference effect. An integrator (140) is configured to integrate commands multiplied by the time constant adapter. A speed proportional gain (150) is configured to accumulate the commands, gain the accumulated commands by a speed ratio, and then output the torque command of the motor. The torque command is then input into a torque control part (160) so as to control the power supplied to the coil of the motor (110).

The invention relates to the technical field of signal reading of charge-coupled devices and the technical field of integrated circuits, and specifically relates to a variable gain correlated double sampling circuit with baseline adjustment. The variable gain correlated double sampling circuit with baseline adjustment comprises a first switched capacitor network and an amplifier; a charge retention node of the first switched capacitor network is connected with a negative input end of the amplifier, an output node of the first switched capacitor network is connected with an output end of the amplifier, and a positive input end of the amplifier is connected with an input common mode level. The variable gain correlated double sampling circuit with baseline adjustment, provided by the invention, can simultaneously realize correlated double sampling, baseline adjustment and gain variation under the condition of only using one amplifier, and has the advantages, such as simple circuit structure, low power consumption, flexible configuration and high applicability; peripheral and follow-up processing circuits of the circuit are simplified further, the dynamic range of a follow-up analog-digital converter is used fully; and by a fully-differential realization mode of the circuit, common-mode interference rejection capability is improved.

The invention discloses an automatic variable-frequency cathode protection station control method for restraining subway direct current interference. The automatic variable-frequency cathode protection station control method for restraining the subway direct current interference comprises the following content that firstly, test data in the earlier stage general testing period are collected; secondly, a typical position on a pipeline is selected; thirdly, targeted testing is carried out on the typical position; fourthly, the position of a station control point is determined; and fifthly, automatic variable-frequency cathode protection power source equipment is determined. The automatic variable-frequency cathode protection station control method for restraining the subway direct current interference integrates the functions of subway direct current interference restraining and forged current cathode protection. The automatic variable-frequency cathode protection power source equipmenthas the capacity to adjust and control current, and the interference restraining effect is remarkable. The corrosion speed of the buried steel pipeline in the action range is controlled to be smallerthan 0.01 mm / year. Restraining of the subway direct current interference is realized through a cathode protection station inside a station yard / valve chest, and the automatic variable-frequency cathode protection station control method for restraining the subway direct current interference has the advantages of being small in investment, reducing occupied land and being convenient to construct compared with the method of drainage improvement along the pipeline. The maintenance and management engineering amount is small after the subway direct current interference preventing measure is taken.

The invention belongs to the technical field of electronic devices and specifically relates to a nonvolatile frequency-adjustable noise interference suppressor and a preparation method thereof. The nonvolatile frequency-adjustable noise interference suppressor comprises a PZT substrate, upper and lower electrodes plated on two surfaces of the PZT substrate and a ferrite diaphragm prepared on the electrode. The PZT substrate comprises defect dipoles, and the thickness is 0.25 mm-1 mm. The thickness of the lower electrode is 10 nm-500 [mu]m. The thickness of the upper electrode is 10-500 nm. The component of the ferrite diaphragm is Ni0.27Zn0.1Fe2.63O4 and is deposited on the upper electrode of the PZT substrate by a spin-coating method at a low temperature of 90 DEG C, the resistivity is 106 [omega]*cm, and the thickness is 1-10 [mu]m. In use, the ferrite diaphragm side of the noise interference suppressor covers a micro-strip or a coplanar waveguide transmission line, only ensuring that the upper and lower electrodes of the PZT substrate does not contact the electrode of the transmission line. The nonvolatile frequency-adjustable noise interference suppressor has the advantages that the interference suppression effect is good, the usage is convenient, the energy is saved, and the central frequency is continuous and adjustable.

The invention discloses an ultra wideband interference suppression technique of minimum bit error rate criterion, which comprises the following steps of: 1, establishing a nonlinear equalizer model; 2, establishing a target function by using minimum bit error rate as criterion; and 3, adjusting the equalizer parameter by adopting a sliding window random gradient algorithm. The bit error rate of asystem is lower, the interference suppression capability of the system is stronger, the nonlinear function has better approximation performance, and the nonlinear equalizer has more excellent interference suppression capability; the system is simple to control, and the nonlinear equalizer can be switched between the minimum bit error rate criterion and the minimum mean square error criterion; thetechnique is simple to implement, the parameter can be adaptively adjusted, and the parameter of the equalizer can be adaptively adjusted on line by using the sliding window random gradient algorithm; and the technique has wide application range, is used for narrowband interference suppression of an ultra wideband communication system, and is also used in the fields of interference suppression, mode identification and the like of other communication systems.