19 results about "Frequency shaping" patented technology

The invention discloses a conformal antenna component manufacturing system and method based on cross-scale space-time frequency shaping femtosecond laser, and belongs to the technical field of micro-nano machining. The system comprises an ultrafast laser excitation module, a laser pulse time / frequency shaping module, a pulse detection module, an online monitoring module and a focusing high-speed scanning galvanometer module. By means of the system, high-selectivity, large-breadth and three-dimensional precision machining of conformal antenna circuit patterns is achieved, and it is ensured that a substrate is not damaged. The femtosecond laser time-frequency shaping technology is combined in the machining process, layered scanning and accurate removal of the heterogeneous multilayer structure are achieved through an adjustable pulse sequence and a high-speed galvanometer system, and the problems that in the prior art, materials are damaged, and the size precision is low are solved. The device further integrates an on-line depth monitoring function, the machining efficiency and the forming quality are remarkably improved, and the device is suitable for high-precision patterning machining of complex curved surface heterogeneous thin film materials.

The invention provides a communication method and device, belongs to the technical field of communication, and is used for improving the sensing performance under the condition of guaranteeing the communication performance of a communication system. In the method, when an element in [b (n)] meets a first feature, a second feature, a third feature or a fourth feature, optimal compromise between communication and sensing performance can be realized, so that the sensing performance can be improved under the condition of ensuring the communication performance of a communication system, namely, the sensing performance can be improved by adaptively selecting an optimal frequency shaping coefficient, and the communication performance of the communication system can be improved. And the joint optimal performance of communication and sensing is realized. Besides, the user signals can be expanded on the whole carrier bandwidth due to the fact that elements in the [a (n)] meet # imgabs0 # imgabs1 #, and therefore the first signal is determined through the [a (n)], all the user signals can occupy the whole carrier bandwidth in the multi-user scene, and the sensing precision and the resolution ratio can be maintained.

The present invention discloses a nano-positioning compensation device for a fly-cutting machine tool and a method for suppressing low-frequency shape errors, which relates to the field of ultra-precision machining technology. The key points of its technical solution are as follows: A three-degree-of-freedom nano-positioning compensation device is arranged on a horizontal fly-cutting machine tool, and the workpiece to be machined is fixed to the three-degree-of-freedom nano-positioning compensation device; According to the static and dynamic parameters of the air-bearing spindle, a precise prediction model of the swing trajectory of the axis inclination angle of the air-bearing spindle under the action of interrupted cutting force is established; The expansion and contraction amounts of the displacement driving support points required for compensating the reverse attitude of the swing trajectory of the axis inclination angle predicted by the precise prediction model are converted into displacement control commands, and the displacement control commands are input into the three-degree-of-freedom nano-positioning compensation device to keep the center line of the workpiece to be machined parallel to the axis of the air-bearing spindle for axis swing error compensation. The present invention effectively solves the problem of low-frequency "saddle-like" shape errors existing on the machined surface of existing machine tools, and realizes the effective elimination of low-frequency "saddle-like" shape errors.

The application provides a communication method and device, belonging to the communication technical field, to improve the sensing performance while ensuring the communication performance of the communication system. In the method, when the elements in [b(n)] satisfy the first feature, the second feature, the third feature or the fourth feature, the optimal compromise between the communication and sensing performance can be achieved, so that the sensing performance can be improved while ensuring the communication performance of the communication system, that is, the joint optimal performance of communication and sensing is achieved by adaptively selecting the optimal frequency shaping coefficient. In addition, because the elements in [a(n)] satisfy that the user signal can be spread over the entire carrier bandwidth, the first signal determined by [a(n)] can make each user signal occupy the entire carrier bandwidth in a multi-user scenario, so as to maintain the sensing accuracy and resolution.

The invention provides an ultrahigh vacuum machining system based on femtosecond laser space-time frequency shaping, relates to the technical field of femtosecond laser shaping, and provides the ultrahigh vacuum machining system based on femtosecond laser space-time frequency shaping which is sequentially provided with a pre-shaping unit, a space-domain shaping unit, a time-domain shaping unit and an in-situ observation unit. The pre-shaping unit is used for weakening the intensity of a light beam and limiting the diameter and the position of the light beam to form a calibration light beam; the airspace shaping unit adjusts the phase and amplitude of the light beam through a spatial light modulator to form an airspace shaped light beam; the time domain shaping unit performs beam splitting through a time domain beam splitter and adjusts an optical path by using a time domain reflector to realize pulse delay and form a time domain shaping light beam, and finally, in the in-situ observation unit, high-precision light beam convergence and sample processing are realized. According to the scheme, the beam quality and the machining precision of the femtosecond laser can be effectively improved.

Various aspects of the present disclosure relate to multiplexing data streams in uplink while maintaining a low peak to average power ratio (PAPR). A base station may configure and / or cause a user equipment (UE) to apply sequence-based frequency shaping to multiplexed data streams. For example, the base station may configure a UE to select, from a set of potential or candidate sequences, a sequence that, when applied to generated data streams (e.g., frequency domain data streams), realizes a low (or lowest) PAPR or other similar metric (e.g., a cubic metric, or CM), such as for generated time domain data streams.

An implantable neuromodulation system is provided comprising at least one stimulation microelectrode, at least one microelectrode, and a frequency-shaping amplifier (FSA). The at least one stimulation microelectrode is configured to deliver a desired electrical stimulation to a neuronal population. The at least one recording microelectrode is configured to receive neural signals from the neuronal population. The FSA is coupled to the at least one recording microelectrode. The FSA is configured to allow for simultaneous electrical recording and electrical stimulation of the neuronal population.

The present invention provides a power control method and apparatus for an underwater thruster motor, comprising: acquiring underwater environmental pressure values ​​and underwater thruster motor stator temperature values ​​to generate a comprehensive compensation coefficient; identifying the influence of hydrodynamic disturbances on motor flux linkage based on the rotational speed signal fed back by the underwater thruster motor rotor position sensor, and dynamically correcting flux linkage commands using a sliding mode variable structure control algorithm to suppress flux linkage distortion; adaptively allocating the current components of the motor stator direct axis and quadrature axis according to the thrust requirements of the vehicle, combined with the comprehensive compensation coefficient and the corrected flux linkage commands, and generating a basic drive signal; performing high-frequency shaping on the basic drive signal to output an adapted voltage pulse sequence, and controlling the motor electromagnetic torque to track the target value corresponding to the thrust requirements in real time. This invention improves the operational stability and control accuracy of the underwater thruster motor.

This application belongs to the field of communication technologies, and provides a communication method and apparatus, to improve sensing performance while communication performance of a communication system is ensured. In the method, when elements in [b(n)] meet a first feature, a second feature, a third feature, or a fourth feature, an optimal compromise between communication and sensing performance can be implemented, so that the sensing performance can be improved while the communication performance of the communication system is ensured, that is, an optimal frequency shaping coefficient is adaptively selected to achieve joint optimal performance of communication and sensing.

Embodiments of the present invention relate to a DFT-s-OFDM signal with spectral expansion. A first communication device (100) acquires Ndata Fourier coefficients on the basis of Ndata data symbols, and repeats Ne Fourier coefficients among the Ndata Fourier coefficients to acquire Nsc Fourier coefficients, where Ne is determined on the basis of at least one of a modulation symbol constellation of the Ndata data symbols and an FDSS window of the first communication device (100); the Nsc Fourier coefficients are multiplied by an FDSS window of a size of Nsc to obtain Nsc frequency shaping Fourier coefficients mapped onto Nsc subcarriers to obtain a transmitted DFT-s-OFDM signal (510). Therefore, the DFT-s-OFDM signal can be transmitted at a lower PAPR (Peak to Average Power Ratio). Furthermore, embodiments of the invention also relate to a corresponding second communication device (300), a corresponding method and a computer program.

The application relates to a method for constructing an ultra-low-loss via hole on a thick electrode by using time / frequency shaping laser, and belongs to the field of electrode material laser processing. The implementation method is as follows: a birefringent crystal, BBO and a high-power objective are used to shape a traditional Gaussian laser into a short-wavelength laser with a certain time delay and focal depth; a harmonic beam splitter is used to solve the safety problem caused by reflected light; a light-limiting diaphragm is used to ensure that laser with high single-pulse energy is used while the spot diameter is reduced, so that an ultra-low-loss low-tortuosity pore structure is prepared on the thick electrode, and the loss is controlled within 1%. The application can solve the safety problem caused by the reflected energy of the frequency-doubled laser, reduce the problem that the introduced pore loss of the thick electrode is too high and cannot be calendered, solve the problem of capacity and rate performance reduction of the thick electrode, and improve the power density, energy density and cycle life of the thick electrode.

This invention provides a 16-channel neural recorder, comprising: a chip integrating an analog front-end and a polarized transmitter, and a software-defined receiver as a transponder. The chip further includes a data buffer, a channel encoder, a DMA that transmits data to the data buffer, and the channel encoder for packetizing and channel coding according to register file configuration parameters. A modulator receives the output of the channel encoder, modulates it, and inputs it to a frequency shaping filter. The output of the frequency shaping filter is then fed to the polarized transmitter. The receiver is based on an FPGA and includes a pairwise connected RF front-end, an FPGA, and an ARM processor. Experimental results show that the input reference noise of the AFE is 2.87 μVrms, and the energy efficiency of the transmitter is 2.8 nJ / bit. The chip consumes a total power of 5.47 mW under maximum load. In vivo experiments on rats demonstrate good system usability.

The present application relates to the technical field of communications, and provides a communication method and an apparatus, used for improving the sensing performance while guaranteeing the communication performance of a communication system. In the method, when elements in [b(n)] meet a first feature, a second feature, a third feature or a fourth feature, optimal trade-off between communication performance and sensing performance can be realized, so that the sensing performance can be improved while guaranteeing the communication performance of a communication system, that is, joint optimal performance of communication and sensing is achieved by adaptively selecting an optimal frequency shaping coefficient. In addition, elements in [a(n)] meet formula (I), and user signals can be expanded on the whole carrier bandwidth, so that a first signal is determined by means of [a(n)], user signals can occupy the whole carrier bandwidth in a multi-user scenario, and the sensing precision and resolution are maintained.

The utility model aims to provide the multi-channel programmable frequency division coefficient frequency measuring device which is low in testing cost, flexible, wide in measuring range and high in adaptability. The high-speed multi-channel time-sharing frequency divider comprises a high-speed multi-channel time-sharing selection module, a high-frequency shaping module, a programmable frequency divider module, a logic control module and a main control board, a tested frequency is accessed to the high-speed multi-channel time-sharing selection module, and the high-speed multi-channel time-sharing selection module is divided into three paths, a first path is connected to the programmable frequency divider module through the high-frequency shaping module, a second path is connected to the programmable frequency divider module through the logic control module, a third path is connected to the main control board through GPIO, and the programmable frequency divider module is connected with the main control board. The utility model is applied to the technical field of frequency measurement.

Embodiments of the invention relate to DFT-s-OFDM signal with spectral extension. A communication device is provided that obtains Ndata Fourier coefficients based on Ndata data symbols, and repeats Ne Fourier coefficients of the Ndata Fourier coefficients to obtain Nsc Fourier coefficients, wherein Ne is determined based on at least one of a modulation symbol constellation of the Ndata data symbols, and a frequency domain spectrum shaping (FDSS) window of the communication device. The Nsc Fourier coefficients are multiplied with an FDSS window of size Nsc to obtain Nsc frequency shaped Fourier coefficients which are mapped onto Nsc subcarriers to obtain a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) signal, which is transmitted.

The invention discloses a method for constructing an ultralow-loss through hole in a thick electrode through time / frequency shaping laser, and belongs to the field of electrode material laser processing. The implementation method comprises the following steps: performing time-frequency shaping on traditional Gaussian laser into short-wavelength laser with certain time delay and focal depth by adopting a birefringent crystal, a BBO (Barium Boron Oxide) and a high-power objective lens, solving the safety problem caused by reflected light by adopting harmonic beam splitting, and ensuring that laser with high monopulse energy is used and the spot diameter is reduced at the same time by adopting a diaphragm limiting mode. A pore structure with ultralow loss and low tortuosity is prepared on a thick electrode, and the loss is controlled within 1%. The safety problem caused by reflection energy of frequency doubling laser can be solved, the problems that the loss of pores introduced into the thick electrode is too high and calendaring cannot be carried out are reduced, the problem that the capacity and the rate capability of the thick electrode are reduced is solved, the power density and the energy density of the thick electrode are improved, and the cycle life of the thick electrode is prolonged.

This invention discloses an oscillator detection circuit, relating to the field of integrated circuit technology, to solve the problem of poor accuracy in oscillator detection and judgment by the main control chip due to existing detection circuits. The detection circuit includes a frequency shaping circuit, a high-voltage generation circuit, a negative-voltage generation circuit, and a voltage conversion circuit connected in stages. The frequency shaping circuit shapes the oscillator's output signal; the high-voltage generation circuit processes the output signal of the frequency shaping circuit to generate a high-voltage signal; the negative-voltage generation circuit provides a negative bias to the detection circuit; and finally, the voltage conversion circuit converts the received signal into a voltage output related to the oscillator frequency. This improves the accuracy of oscillator detection and judgment by the main control chip.

The invention provides a communication method and device, belongs to the technical field of communication, and is used for improving the sensing performance under the condition of guaranteeing the communication performance of a communication system. In the method, when elements in the method meet a first feature, a second feature, a third feature or a fourth feature, optimal compromise between communication and sensing performance can be realized, so that the sensing performance can be improved under the condition of ensuring the communication performance of a communication system, namely, the sensing performance can be improved by adaptively selecting an optimal frequency shaping coefficient. And the joint optimal performance of communication and sensing is realized. Besides, the user signals can be expanded on the whole carrier bandwidth due to the fact that the elements meet the requirements, and therefore the user signals can occupy the whole carrier bandwidth and maintain sensing precision and resolution in the multi-user scene by determining the first signal.

The application discloses a kind of based on cross-scale space-time frequency shaping femtosecond laser's conformal antenna component manufacturing system and method, belong to micro-nano processing technical field.The system includes ultrafast laser excitation module, laser pulse time / frequency shaping module, pulse detection module, online monitoring module and focusing high-speed scanning galvanometer module.Through the system, realize high selectivity, large format, three-dimensional precision machining to conformal antenna circuit pattern, ensure that substrate is undamaged.Processing process is combined with femtosecond laser time-frequency shaping technology, adjustable pulse sequence and high-speed galvanometer system are used to realize the layering scanning and accurate removal of heterogeneous multilayer structure, avoid the problems of material damage, low size accuracy and other problems existing in prior art.The application also integrates online depth monitoring function, significantly improves processing efficiency and forming quality, and is suitable for high-precision patterning of complex curved surface heterogeneous thin film materials.