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

The invention relates to a compressed sensing PIE system based on space-frequency coding. In a transmitter, a channel encoder, a modulator, an orthogonal converter, a symbol interleaver, a serial-to-parallel converter and a space-frequency encoder are successively connected in series, the space-frequency encoder is connected with two subcarrier mapping devices of the same structure, and each subcarrier mapping device is successively connected with an up sampler, a reverse discrete Fourier transformer, a cyclic prefix adder, a parallel-to-serial converter, a D/A conversion and RF emitter and an emission antenna. A receiver comprises a reception antenna, an RF front-end converter, an A/D converter, a Doppler frequency offset estimator, a Doppler frequency offset compensator, a cyclic prefix remover, a discrete Fourier transformer, a compressed sensing interference eliminator, a frequency-domain down sampler, a channel estimator, a space-frequency decoder, a symbolic solution interleaver, a reverse orthogonal converter and a channel decoder successively in serial connection. The compressed sensing algorithm can be directly utilized to reconstruct pulse signals of a range finder and converts the pulse signals to the frequency domain for elimination, and thus, the pulse signals of the range finder are effectively inhibited.

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 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 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 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.

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.

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 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 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.