30results about "Transmission noise reduction" patented technology

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 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.

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.

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.

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.

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.

Embodiments disclosed herein relate to reducing insertion loss in a transceiver while improving an operating efficiency of the transceiver. To do so, the transceiver may include isolation circuitry with harmonic distortion rejection circuitry, an electrostatic discharge filter, an out-of-band noise filter, and / or a matching network. In particular, the harmonic distortion rejection circuitry may enable a second harmonic signal to pass from a power amplifier of a transmitter of the transceiver to ground. The electrostatic discharge filter may also provide a path to ground for electrostatic discharge, and the out-of-band noise filter may provide a path to ground for noise signals. The isolation circuitry may substantially remove or decrease interference caused by undesirable signals while reducing a power consumption and thus improving an operating efficiency of the transceiver.

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.

The invention relates to the technical field of communication, and discloses a quantum enhanced inductance system for 6G and an interference suppression method, and the system comprises a double-channel heterogeneous radio frequency front end, a cooperative processing core, and a self-adaptive quantum state control loop. The double-channel heterogeneous radio frequency front end comprises a traditional broadband radio frequency link and a Rydberg atomic quantum enhanced radio frequency link which are parallel and used for synchronously receiving the same antenna signal. Through the non-saturation characteristic of the quantum link, the effective instantaneous dynamic range of the system can be improved by more than 20dB, so that reliable communication can be maintained in extreme scenes such as radar sidelobe and hostile interference.

High frequency current source for active EMI filter, active EMI filter and use of active EMI filter. A high frequency current source having a symmetric bipolar output stage piloted by an active bias network with extended temperature range. The source is configured to provide high impedance at 1 MHz and above. The invention includes such active EMI filter having such high frequency current source, for example in a current sense current injection feedback configuration.

The invention provides a flexible wearable instant detection device. The flexible wearable instant detection equipment comprises a flexible circuit structure and an anti-interference antenna assembly, the flexible circuit structure comprises a flexible circuit layer and a thin film electrode type sensor, and the sensor is printed on the flexible circuit layer; the anti-interference antenna assembly comprises a multi-band conformal antenna and a frequency selection surface layer, the multi-band conformal antenna is embedded in the equipment middle frame, and the frequency selection surface layer is arranged on the equipment back shell. According to the device, high-comfort wearing is achieved through the flexible printed circuit and the conformal antenna technology, the multi-band anti-interference design and the self-checking circuit module are combined, and the signal stability and the device reliability are improved.

A method and apparatus for transmitting a data signal, comprising receiving a digital data signal by 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 by a first inverted data input of the transmitter multiplexer; counting a clock signal by a first counter; transmitting a first select signal to a first select signal input of the transmitter multiplexer in response to the first counter counting a threshold number of clock cycles by the first counter; and alternately transmitting the digital data signal and the inverted digital data signal as a transmitter output signal to a receiver in response to the first select signal and by a first digital data signal output of the transmitter multiplexer, the receiver and the digital data signal output operably coupled to a data link.

This refrigerator comprises: a storage chamber; a motor; a door configured to open and close the storage chamber; a compressor configured to supply cold air to the storage chamber, wherein the compressor is configured to compress a refrigerant by using rotation of the motor; a first printed board assembly (PBA) including a first communication circuit and a first processor, the first communication circuit including a first low-pass filter including a first variable resistor and a first variable capacitor, and the first processor being connected to the first communication circuit; and a second PBA including a second communication circuit and a second processor, the second communication circuit including a second low-pass filter including a second variable resistor and a second variable capacitor, and the second processor being connected to the second communication circuit, wherein the first processor is configured to: set a resistance value of the first variable resistor and a capacitance value of the first variable capacitor on the basis of rotational speed information of the motor; and communicate with the second processor through the first communication circuit by using an asynchronous communication method.

A communication device includes an inter-layer interference cancellation circuit to cancel a first inter-layer interference of a first observation signal to generate a first interference cancellation signal; a first determination circuit coupled to the interlayer interference cancellation circuit for determining a first center of a first search area according to the first interference cancellation signal; a second decision circuit, coupled to the first decision circuit, for determining a first size of the first search area according to a first Gaussian interruption probability and a first signal-to-noise ratio; and a third decision circuit, coupled to the second decision circuit, for determining a first number of at least one first candidate symbol of the first interference cancellation signal according to the first size of the first search area.

The present invention provides a single sideband signal generator including a modulator configured to generate a first and a second modulated optical signals which have equal amplitudes but opposite phases; a first optical delay line-based sideband suppressing optical circuit for generating a full-carrier single sideband signal and / or a second optical delay line-based sideband suppressing optical circuit for generating a carrier-suppressed single sideband signal. The present invention simplifies the structure by saving half of the space occupied by the redundant signal electrodes and also reducing the RF power consumption by half by removing the RF hybrid. The provided single sideband signal generator can enable compact, low-cost, and power-efficient SSB signal generation and be easily scaled to higher frequency domains without additional cost by appropriately designing the optical delay line length.

The invention discloses an anti-interference communication system based on a Rydberg atom receiver. The anti-interference communication system comprises a radio frequency signal coupling module, a traditional signal receiving and processing link, a quantum enhancement sensing link, a cooperative processing and control module and a signal fusion and output module. The radio frequency signal coupling module receives a mixed radio frequency signal containing a strong interference signal and a weak target signal and couples and distributes the mixed radio frequency signal into two paths; the traditional signal receiving and processing link processes one path of coupling signal; the quantum enhancement sensing link processes the other path of coupling signal; the cooperative processing and control module cancels interference from the quantum link signal and extracts a weak target signal; and the signal fusion and output module demodulates and decodes the weak target signal and outputs communication data, and selectively outputs electromagnetic environment sensing information. According to the invention, the problems that weak target signals in a strong interference coexistence scene are easy to submerge, and high-fidelity capture and reliable extraction are difficult to realize are solved.

The invention discloses a multi-unmanned aerial vehicle public rate allocation method based on rate segmentation multiple access (RSMA), and solves the problem of difficulty in solving due to the fact that an objective function and constraints in power allocation are generally non-convexity due to the RSMA technical structure. Firstly, a convex relaxation technology is adopted to convert a non-convex problem into a convex optimization problem by utilizing logarithm transformation or fractional programming. And then, alternately optimizing power distribution by using an iterative optimization method to gradually approach to an optimal solution. Therefore, for a multi-user (multi-unmanned aerial vehicle) scene, the calculation complexity is relatively high. According to the invention, the channel gain of the unmanned aerial vehicle with the minimum channel gain in the unmanned aerial vehicle set is improved on the premise that the base station allocates the power resources to the public message and the private message respectively, so that the number of resources sold by a game leader can be improved. The invention aims to provide a unique and low-complexity solution. The method physically accords with the scene of practical application and can be effectively applied to engineering practice.

A refrigerator includes: a storage compartment; a motor; a door configured to open and close the storage compartment; a compressor configured to supply cold air to the storage compartment, and configured to compress a refrigerant using rotation of the motor; a first printed board assembly (PBA) including: a first communication circuit including a first low pass filter that comprises a first variable resistor and a first variable capacitor, and a first processor connected to the first communication circuit; and a second PBA including: a second communication circuit including a second low pass filter that comprises a second variable resistor and a second variable capacitor, and a second processor connected to the second communication circuit, wherein the first processor is configured to: set a resistance value of the first variable resistor and a capacitance value of the first variable capacitor.

The application discloses a microwave photonics system double optical path cancellation optical noise elimination method and device. The method comprises the following steps: receiving a pulse light source signal, and inputting the pulse light source signal into a pre-constructed double optical path; collecting an output signal of the double optical path, and constructing the collected output signal of the double optical path into virtual double-channel data; determining a down-conversion signal from the virtual double-channel data by using a Fast-ICA algorithm, so as to realize elimination of an optical noise signal. The above scheme realizes elimination of optical relative intensity noise in a microwave photonics system, has fast calculation speed, can recover the down-conversion signal to the maximum extent, and improves the sensitivity of the system; and the above method does not need strict consistency of amplitudes and phases of double optical path signals, and the phases of the double optical path signals can be different by an integral multiple of a heavy frequency period, so that the method is more easily realized in engineering.

A dryer is provided. The dryer includes a drum, a hot air supply device, a motor, a power supply device, and a processor, wherein the power supply device includes a power terminal unit for receiving AC power through a first and second input terminals, an EMI filter for removing noise, and a ground terminal connected to the power supply device, wherein the EMI filter includes 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, and a second common mode filter, a third inductor wound around the second core, a fourth capacitor connected to the third inductor, a fourth inductor wound around the second core, and a fifth capacitor connected to the fourth inductor.

The embodiment of the invention provides a Bluetooth device and a Bluetooth headset, the Bluetooth device can comprise a Bluetooth communication module, a power supply and an electric appliance, the power supply is configured to provide current for the Bluetooth communication module and the electric appliance, when the Bluetooth communication module transmits a Bluetooth signal, the electric appliance is in a first state, and when the Bluetooth communication module transmits a Bluetooth signal, the electric appliance is in a second state. The power supply outputs a first current; when the Bluetooth communication module does not transmit the Bluetooth signal, the electric appliance is in a second state, and the power supply outputs a second current; the difference value of the first current and the second current is within a first preset range. According to the embodiment of the invention, the power supply can stably output current, and electromagnetic energy emitted by the power supply due to large jitter of the current is reduced, so that the noise of the Bluetooth equipment can be effectively reduced.

A signal reconstruction method in a complex electromagnetic environment based on double receiving stations comprises the following steps: constructing a data transmission link between the double receiving stations, converging two paths of received data, then performing integration and interval division on the two paths of received signal data in a sparse domain, and selecting sampling point data for reconstructing a certain transmitting signal in a certain interval; carrying out reconstruction factor calculation on a certain transmitting signal by utilizing the selected and integrated data; reconstructing a certain transmitting signal by using the calculated reconstruction factor of the certain signal, the sampling data of the two paths of received signals and the reconstructed received signal sampling data; and re-selecting sampling point data for reconstructing other transmitting signals, calculating a reconstruction factor, and re-calculating to obtain other reconstructed transmitting signals until all transmitting signals are reconstructed.

Embodiments of the present application provide a Bluetooth device and a Bluetooth earphone. The Bluetooth device can include a Bluetooth communication module, a power supply and an electrical appliance. The power supply is configured to provide current for the Bluetooth communication module and the electrical appliance. When the Bluetooth communication module transmits a Bluetooth signal, the electrical appliance is in a first state, and the power supply outputs a first current. When the Bluetooth communication module does not transmit the Bluetooth signal, the electrical appliance is in a second state, and the power supply outputs a second current. A difference between the first current and the second current is within a first preset range. Embodiments of the present application can make the power supply output a relatively stable current, reduce electromagnetic energy emitted by the power supply due to large current fluctuation, and thus effectively reduce noise of the Bluetooth device.

Embodiments of the present disclosure provide a precoding method, a communication apparatus, and a storage medium. The method includes: acquiring, by an access node, a preprocessed modulation symbol from a control node, where the preprocessed modulation symbol is obtained by preprocessing a modulation symbol by a preprocessing matrix; precoding, by the access node, the preprocessed modulation symbol, to obtain a precoded modulation symbol; and sending, by the access node, the precoded modulation symbol.

The invention discloses a broadband communication signal extraction method of an underwater acoustic mobile platform under a strong noise background, and belongs to the field of underwater wireless communication and array signal processing thereof. The problems that under the background of underwater sound long-time broadband signals and a small-aperture array, a traditional signal extraction method is high in complexity, and it cannot be guaranteed that information is not distorted under strong interference are solved. The method comprises the following steps of: preprocessing communication signals under array elements corresponding to channels, and performing FFT (Fast Fourier Transform) on each array element signal; and sub-band division constraint is carried out, bandwidth weight vectors of the sub-bands are constructed according to the center frequencies of the sub-bands, the bandwidth weight vectors of the sub-bands are utilized to carry out weighted combination on the frequency domain signals of all the array elements, the frequency domain signals of all the sub-bands are spliced and then are converted back to the time domain through IFFT, and signal extraction is completed. The method is mainly used for underwater communication signal extraction.

The application discloses a direct current carrier communication system in the form of a direct current bridge, which comprises a plurality of carrier communication modules, each of which is arranged on a power bus of a zero-carbon building and connected with a power generation system and a main power consumption system of the zero-carbon building, and a direct current bridge is established between the carrier communication modules on different power buses through a direct current carrier information flow; each carrier communication module comprises a CPU module, a power module, a storage module and a communication function module, the power module is connected with the power generation system of the zero-carbon building, and the communication function module comprises a channel estimation unit, a filtering unit, a spectrum sensing unit and a packet aggregation unit. By designing the carrier communication module to cooperate with the power bus of the zero-carbon building to establish a power bridge, the control form is flexible, and the adaptability to the zero-carbon building is high.

The invention discloses a broadband noise suppression method based on low-rank tensor approximation, and relates to the technical field of signal processing, and the method comprises the steps: obtaining an original vertical array receiving signal, and carrying out the preprocessing of the signal, and obtaining a time domain signal; constructing a three-dimensional observation tensor related to depth, time and frequency according to the time domain signal; and restraining a low-rank signal tensor in the three-dimensional observation tensor, a pulse noise tensor in the three-dimensional observation tensor and a Gaussian noise tensor in the three-dimensional observation tensor, thereby obtaining a low-rank target tensor. According to the method, the traditional matrix processing is expanded to the high-dimensional tensor space, and the noise reduction problem of the original vertical array receiving signal is expressed as the problem of Gaussian noise and pulse interference separation from the low-rank target signal under low-rank tensor approximation, so that the noise suppression is performed on the original vertical array receiving signal; and then a pure low-rank target tensor is separated out.

The application relates to the field of power line communication, and discloses a power line communication system. The power line communication system can comprise a power conversion device, a signal isolation circuit, a signal adjustment circuit, a transformer and an operation circuit. The output end of the power conversion device is connected with a power line through the signal isolation circuit, the signal isolation circuit can be used for isolating an input signal of the power line to obtain a first noise signal of the power conversion device. The first input end of the signal adjustment circuit is connected with the output end of the power conversion device, the signal adjustment circuit can be used for inverting the phase of the first noise signal and outputting a second noise signal. The input end of the transformer is connected with the power line, the transformer can be used for filtering a power signal in the input signal of the power line to output a first signal. The operation circuit can be used for outputting a first communication signal according to the first signal and the second noise signal.