110results about "Transmission noise reduction" patented technology

To provide a PLC noise filtering method and system based on a clustering theory, and a medium, that have the advantages of good noise filtering performance, very simple calculation, good filtering effect and high filtering efficiency.SOLUTION: A method comprises the steps: obtaining a to-be-processed PLC signal sequence; and calculating a noise determination threshold according to a clustering property of a PLC signal and noise, and filtering the noise in the PLC signal sequence according to the noise determination threshold. According to the method, In order to distinguish among a PLC modulation signal, pulse noise and background noise through the clustering property of the signals and the noise, a difference among the PLC modulation signal, the pulse noise and the background noise in an aspect of amplitude continuity is utilized.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of communication, and discloses a communication method and system based on broadband interference suppression and target signal reconstruction, and the method comprises the steps: collecting an original broadband communication signal; carrying out compressed sampling on the preprocessed signal to obtain compressed data; performing time-frequency domain conversion on the compressed data, and performing sparse representation on the signal by using the sparse dictionary to obtain time-frequency domain conversion data; reconstructing an original broadband communication signal from the time-frequency domain conversion data by adopting an iterative reconstruction algorithm and combining an interference suppression strategy, and eliminating an interference component to obtain a target signal; and comparing the quality index of the reconstructed target signal with a preset performance index, and dynamically optimizing at least one key parameter of compressed sampling, sparse representation, iterative reconstruction or interference suppression according to a comparison result. According to the method, a complex and changeable interference environment can be adaptively dealt with, it is ensured that the system always keeps the optimal processing effect, and the robustness is far better than that of a traditional method adopting fixed parameters.

The invention discloses an intelligent communication system and equipment in a high-noise scene, and relates to the technical field of communication, the system comprises a communication host, a Bluetooth pickup, a head-mounted loudspeaker assembly and a command and dispatch platform; the Bluetooth pickup is connected with a positive pressure type air respirator of a wearer and used for collecting voice signals and transmitting the voice signals to the communication host through Bluetooth, and the communication host transmits the signals to the commanding and dispatching platform after the voice signals are processed through a noise reduction algorithm. According to the intelligent communication system and equipment in the high-noise scene, deep learning and adaptive gain control technologies are utilized, the communication quality, voice definition and system response speed are remarkably improved in the high-noise scene, meanwhile, the defects of a traditional technology in a complex noise environment are overcome, and the intelligent communication system and equipment in the high-noise scene have a wide application prospect. The requirements that efficient communication and equipment control still need to be carried out when the two hands of a fireman are occupied are met, powerful technical support is provided for high-risk tasks such as fire rescue, and high efficiency and safety of task execution are ensured.

The invention discloses a distributed cooperative interference management method for a multi-task air federated learning system, and the method comprises the steps: firstly, obtaining channel information between each base station and associated edge equipment, and an interference temperature value between the base stations, so as to construct a communication parameter optimization model; secondly, calculating the optimal transmission power and the optimal noise reduction factor through interference temperature negotiation between paired base stations by adopting a distributed coordination mechanism; then, all base station pairs are traversed circularly, and collaborative optimization of power and noise reduction factors of the whole network is completed; and finally, the edge equipment executes air aggregation transmission of gradient signals based on the optimal transmission power, and the target base station completes signal processing and updates the cell model according to the optimal noise reduction factor of the target base station. According to the distributed cooperative interference management method, the cross-cell performance balance of a multi-task system can be remarkably improved, the communication and calculation burden can be effectively reduced, the network expansibility and stability are improved, and the distributed cooperative interference management method is more suitable for multi-task air federated learning in a large-scale network environment.

The application provides a multi-target unmanned aerial vehicle uplink tracking interference method based on a frequency hopping pattern; frequency hopping signals present periodic occurrence rules in each subchannel, and the periods are all frequency hopping sequence periods, so that tracking interference is completed on the periodic signals of each subchannel, and the whole tracking interference on the single unmanned aerial vehicle frequency hopping link is realized. Based on this feature, the application divides different subchannels and different tracking and interference threads in the same channel, converts the problem of tracking and interfering on multiple unmanned aerial vehicles into the problem of tracking and interfering on various periodic signals in different subchannels, can track the frequency hopping time of the frequency hopping signal under the condition of complex time-frequency domain distribution of the frequency hopping signal and unknown accurate frequency hopping period parameters, accurately interferes on the communication link of the multiple unmanned aerial vehicles, has short interference response time and high interference efficiency, and thus better completes the multi-unmanned aerial vehicle countermeasure task.

The invention relates to a signal noise suppression system based on an optical time domain reflectometer, and the system comprises a transmitting unit which is used for generating an optical time domain reflection pulse signal with preset parameters according to control information; the testing unit is connected with the transmitting unit and the optical fiber to be tested and is used for injecting the received pulse signal into the optical fiber to be tested and guiding the reflected echo optical signal into the receiving unit; the receiving unit is connected with the testing unit and is used for receiving the echo optical signal and converting the echo optical signal into a digital signal, so that the data processing unit can receive and process the digital signal conveniently; and the data processing unit is respectively connected with the receiving unit and the transmitting unit and is used for carrying out range dynamic filtering processing according to the data signal transmitted by the receiving unit, storing the filtered signal and transmitting control information to the transmitting unit, so that the transmitting unit generates a pulse signal with a preset parameter according to the signal. The technical problems of signal broadening deformation and time delay, slow system operation, increased test blind area and the like in the prior art are solved.

The present invention discloses a waveform design and demodulation method suitable for high-speed frequency hopping, which relates to a transmission technology in the field of satellite communication that can effectively improve the anti-interference ability of the system. The present invention realizes the synchronization of high-speed frequency hopping signals through a variety of technologies such as specific frame structure design, synchronization sequence capture and tracking, high-speed frequency synthesis control, and diversity reception, and realizes interference avoidance, interference elimination and other functions through interference detection, interference processing and other means, thereby realizing a strong anti-interference function of the communication system. It also has the survivability and robustness of the frequency hopping system. It is particularly suitable for improving the anti-interference ability of the satellite communication system.

Mounting systems for telecommunications components include a shielding device that shields the components from the effects of passive intermodulation (PIM). The shielding devices can include a shielding panel or element made of a carbon fiber material that absorbs radio frequency interference, allowing the shielded component to clearly transmit and receive signals without interference due to PIM. The telecommunications tower can incorporate a composite material, such as a carbon fiber material or other non-corrosive material. The composite material can be incorporated into the frame and / or into mounting device providing for the mounting of components to the telecommunications tower, to mitigate the degradation, for example, in the form of corrosion, thus reducing or substantially eliminating sources of PIM.

The present invention relates to the connection of a charging circuit for charging an electrical energy accumulator by means of a single-phase or multi-phase electrical alternating voltage. To this end, a filter means for suppressing interfering signals is provided at an input before a switchover between a single-phase or multi-phase charging process. In this way, the properties, in particular the capacitive properties, of the filter means are not influenced by the circuit configuration at the switchover between single-phase or multi-phase charging.

The present application belongs to the field of magnetic functional materials and components, and relates to high-frequency electromagnetic interference suppression technology, in particular to an integrated thin film noise suppressor. The present application divides the magnetic thin film into layers, integrates multiple layers of soft magnetic thin film on the transmission line through the isolation of the insulating layer, realizes the suppression of noise through the magnetic loss of the soft magnetic thin film, and can form an integrated thin film noise suppressor with single frequency point or multiple frequency points in the frequency range of 0-6GHz. The present application provides an optional scheme for further satisfying wideband electromagnetic noise suppression by adjusting the type or thickness of the magnetic film material according to actual needs. The present application has the advantages of simple structure and process, integrability, high performance, wide frequency band and high applicability.

The invention relates to a communication method and device and a storage medium. According to a charging parameter corresponding to a wireless charging receiving end, a target communication capacitor corresponding to the charging parameter is determined; wherein the charging parameters represent the size of the charging load, and different charging parameters correspond to communication capacitors with different capacitance values; and using the target communication capacitor to communicate with a wireless charging transmitting terminal.

The invention relates to the fields of communication and navigation integration, pilot frequency design, interference resistance, delay Doppler and the like, in particular to a pilot frequency design conduction integrated anti-interference signal communication method. Specifically, the traditional pilot frequency design scheme can realize interference resistance, but is not favorable for realizing conduction integration. According to the method for resisting the five-point comb interference based on the superposed pilot frequency design, the signal pilot frequency and the data symbol are superposed, a guard interval is not set, and therefore no loss exists on the communication symbol. Theoretical derivation and simulation experiments both verify the effectiveness of the scheme.

Processing a signal originating from a node port experiencing ingress. A node that provides service to a plurality of cable modems will generally have a plurality of node ports. The node may be a Remote PHY Node or a Remote MACPHY node (RMN) for example. A detection is made that a particular node port of the node is experiencing ingress. In response, an upstream signal originating from the particular node port is analyzed to dynamically determine an amount to attenuate the upstream signal. The upstream signal is attenuated the dynamically determined amount prior to the signal being processed at an active device upstream from the particular node port experiencing the ingress. Distortion and / or saturation of the signal at the active device is advantageously prevented.

Method and apparatus for transferring a data signal including receiving a digital data signal by a first data input of a transmitter multiplexer; inverting the digital data signal by a first inverter,

A method for reducing noise using a neural-network-based adaptive line enhancer includes receiving an input signal including a narrowband signal and noise. The narrow signal and the noise are de-correlated via an artificial neural network. The artificial neural network generates an estimate of the narrowband signal. The noise in the input signal is reduced based on the estimated narrowband signal.

An electronic apparatus comprising an electronic board on which are placed an electronic subassembly and a filtering unit, the analog subassembly comprising one or more radiofrequency analog components for receiving radiofrequency components is proposed. The analog subassembly is protected by shielding placed on one side of the electronic board, the filtering unit is placed on the side of the electronic board on a signal path electrically connected to the analog subassembly, the filtering unit comprises a capacitive component placed under the shielding and connected to an analog ground, and the filtering unit further comprises a filtering component placed on the input to the filtering unit in series with the signal path on passing through the shielding or in the immediate vicinity of the shielding.

A method and apparatus for removal of a parasitic coupling of a signal source to an output of an antenna array comprising at least one antenna element connected via an associated controllable switch to a signal receiver connected to the output of said antenna array, the method includes measuring a parasitic coupling signal received by the signal receiver connected to the output of said antenna array while all switches of the antenna array are switched off and a first reference signal received by a reference signal receiver; measuring a total reception signal for each antenna element and a second reference signal; calculating a parasitic coupling free reception signal for each antenna element by subtracting a ratio between the measured parasitic coupling signal and the measured first reference signal from a ratio between the total reception signal.

A signal isolation device comprises a transmitting chip having a pair of input terminals coupled to a pair of transmitter output terminals. A receiving chip includes a pair of receiver input terminals, a pair of output terminals, and a coupler region, the transmitting chip being attached to a top surface of the receiving chip. The coupler region includes a transmitting coil connected to the pair of transmitter output terminals, a receiving coil positioned proximate the transmitting coil and connected to the pair of output terminals, a receiving circuit, and a shielding layer positioned between the receiving circuit and the receiving coil.

The present invention provides a single sideband signal generator, comprising: a modulator configured to generate a first modulated optical signal and a second modulated optical signal having the same amplitude; and the sideband suppression light circuit based on the first light delay line is used for generating a full-carrier single-side-band signal, and / or the sideband suppression light circuit based on the second light delay line is used for generating a carrier-suppressed single-side-band signal. The present invention simplifies the structure by saving half the space occupied by redundant signal electrodes, and also reduces the RF power consumption by half by removing an RF mixer. The provided single side band (SSB) signal generator has the advantages of compact structure, low cost and energy conservation. By reasonably designing the length of the optical delay line, the generator can be easily expanded to a higher frequency range on the premise of not needing extra cost.

An electronic device may include wireless circuitry with a transmit antenna that transmits signals and a receive antenna that receives reflected signals. The wireless circuitry may detect a range between the device and an external object based on the transmitted signals and the reflected signals. When the range exceeds a first threshold, the wireless circuitry may use the transmitted signals and received signals to record background noise. When the range is less than a second threshold value, the wireless circuitry may detect the range based on the reflected signals and the recorded background noise. This may allow the range to be accurately measured within an ultra-short range domain even when the device is placed in different device cases, placed on different surfaces, etc.

An embodiment of the present application provides a precoding method, a communication device, and a storage medium, the method including: an access node obtaining preprocessed modulation symbols from a control node, where the preprocessed modulation symbols are obtained by preprocessing the modulation symbols with a preprocessing matrix; an access node precoding the preprocessed modulation symbols to obtain precoded modulation symbols; and an access node transmitting the precoded modulation symbols.

A method and apparatus for transmitting a data signal, comprising receiving a digital data signal through a first data input of a transmitter multiplexer; inverting the digital data signal by a first inverter, thereby providing an inverted digital data signal; receiving the inverted digital data signal through a first inverted data input of the transmitter multiplexer; counting a clock signal by a first counter; transmitting a first select signal by the first counter and, in response to the first counter counting a threshold number of clock cycles, to a first select signal input of the transmitter multiplexer;and in response to the first selection signal and through a first digital data signal output of the transmitter multiplexer, alternately transmitting the digital data signal and the inverted digital data signal as the output signal of the transmitter to a receiver, the receiver and the digital data signal output being operatively connected to a data link;

An apparatus and method to measure nonlinear system noises may include a processor to generate a bilateral notch signal, a unilateral notch signal and a multi-tone signal; to measure power of an additive Gaussian white noise of a nonlinear system by using the multi-tone signal; to measure a first power-to-noise ratio of the nonlinear system by using the bilateral notch signal; to measure a second power-to-noise ratio of the nonlinear system by using the unilateral notch signal. The processor is to calculate a nonlinear power-to-noise ratio of the nonlinear system and a power-to-noise ratio introduced by IQ imbalance according to the power of the additive Gaussian white noise, the first power-to-noise ratio and the second power-to-noise ratio.

This dryer comprises: a drum for accommodating an object to be dried; a hot air supply device for supplying hot air into the drum; a motor used to rotate the drum; a power supply device for supplying power to the motor; and at least one processor for controlling the motor. The power supply device comprises: a power terminal unit for receiving AC power including a ground wire through a first input terminal and a second input terminal; an EMI filter for removing noise included in the AC power; and a ground terminal including the ground wire connected to the power supply device. The EMI filter comprises: an X capacitor unit including a first capacitor; a first common mode filter including a first core, a first inductor wound around the first core, and a second inductor wound around the first core; a Y capacitor unit including a second capacitor and a third capacitor connected in series; and a second common mode filter including a second core, a third inductor wound around the second core, a fourth capacitor connected in parallel to the third inductor, a fourth inductor wound around the second core, and a fifth capacitor connected in parallel to the fourth inductor.

In an example, a method of designing wireless communication apparatus is provided. The wireless communication apparatus comprises at least one power supply, at least one wireless transceiver, and at least one power cable between the at least one power supply and the at least one wireless transceiver. The method comprises modelling the wireless communication apparatus as a resistor inductor capacitor (RLC) network, and selecting one or more components for the RLC network that when applied to the RLC network maintain a step response of the RLC network within an overshoot threshold and / or an undershoot threshold. The method also comprises applying the selected one or more components to a design of the wireless communication apparatus.

The present disclosure provides methods and systems for reducing noise induced in one or more components in a hearing aid. The present disclosure provides methods for reducing noise induced in telecoils.

Low noise charge pumps are disclosed. In certain embodiments, a charge pump includes a charge pump output terminal configured to provide a charge pump voltage, a switched capacitor, an inverter having an output electrically connected to a first end of the switched capacitor, a pair of charging switches connected between a second end of the switched capacitor and a reference voltage, and a pair of discharging switches connected between the second end of the switched capacitor and the charge pump output terminal. The pair of charging switches is closed during a charging operation and open during a discharging operation, while the pair of discharging switches closed during the discharging operation and open during the charging operation.

A full-duplex communication apparatus and method are provided, and relate to the field of communication technologies, to improve a self-interference cancellation capability of the full-duplex communication apparatus. The full-duplex communication apparatus includes a first antenna, a second antenna, and a gating apparatus. The full-duplex communication apparatus may receive a first signal from the first antenna through the gating apparatus, and perform interference suppression or cancellation on the first signal; and may further transmit a signal through the second antenna.

This invention provides a wireless walkie-talkie and its anti-crosstalk method. The method includes: locating the walkie-talkie's position using a positioning system; when the walkie-talkie configuration information set does not completely cover all walkie-talkie configuration information, filtering out walkie-talkie configuration information not included in the set to obtain a set of available walkie-talkie configuration information; and a server selecting walkie-talkie configuration information from the available information set and configuring it into the walkie-talkie via a wireless transmission module. This invention avoids crosstalk phenomena caused by identical walkie-talkie configurations with other walkie-talkies, prevents communication with other walkie-talkies, and improves the privacy of walkie-talkie conversations within the team. Simultaneously, configuring the walkie-talkie configuration information wirelessly avoids manual configuration by the user, reduces the difficulty of operating the walkie-talkie, saves operation time, and improves the user experience.

The application discloses an anti-interference method of a surface acoustic wave passive wireless sensing system based on artificial intelligence. Firstly, radio frequency signal intensity data of various surface acoustic wave echo signals including noise, normal response and interference under different frequencies are acquired, and different labels are given to the radio frequency signal intensity data. The radio frequency signal intensity data is sequentially preprocessed, standardized, one-hot encoded and an additional dimension is added, so that the data becomes three-dimensional. A one-dimensional CNN neural network classification model of a training attention mechanism is constructed. The model comprises a one-dimensional convolution layer used for extracting time-frequency features of the radio frequency signal intensity data, and the size of the convolution kernel is 1, the padding is 1 and the step is 1, and an attention mechanism module used for weighted average of the time-frequency features extracted by the one-dimensional convolution layer. The one-dimensional CNN neural network model after training is used to output the category of a new surface acoustic wave echo signal. When the anti-interference is realized, the time domain and frequency domain information of the echo signal can be reserved, the loss of information is reduced, and the signal reconstruction quality and reliability are improved.