159 results about "Bandwidth expansion" patented technology

According to the capacitance-enhanced circular isolator structure provided by the invention, common-ground electric connection is realized by forming a ground metal boss structure, the distance between a grounding metal and a multi-path impedance adding structure is remarkably reduced, the ground capacitance of the multi-path impedance adding structure is remarkably improved, and meanwhile, bandwidth expansion is realized through capacitance-inductance cooperative tuning; a second-order LC matching network is adopted in three radio frequency ports, a slotting part of a matching capacitor can enable a matching inductor and the matching capacitor to share space to a certain extent, so that the size of the matching network is effectively reduced, a first-order LC matching network is adopted in an absorption port, impedance matching of the absorption port is realized under the condition that only a single resistor is added, and the impedance matching performance of the absorption port is improved. The size of the matching network can be reduced while a good absorption effect is achieved, and the size of the non-reciprocal central junction structure can be reduced; in addition, the first non-reciprocal central junction structure and the second non-reciprocal central junction structure are subjected to conjugate matching by adopting an L-C-L type matching network, so that good isolation performance is realized.

The invention relates to the technical field of electrical engineering and intelligent fault diagnosis, and discloses a water pump motor fault diagnosis method and system based on current harmonic characteristics, and the method comprises the steps: collecting stator current, rotating speed and load signals; generating an alpha-beta current component through Clark transformation, constructing an analytic signal, extracting an instantaneous phase, and calculating an instantaneous frequency; a mapping relation is established in combination with the rotating speed, and the current signals are resampled to eliminate frequency dispersion; obtaining a high-resolution harmonic energy distribution diagram by adopting multi-scale synchronous compression wavelet transform; and extracting an energy concentration ratio, a peak offset and a bandwidth expansion coefficient in the characteristic frequency band, inputting the energy concentration ratio, the peak offset and the bandwidth expansion coefficient into the pre-trained multi-layer perceptron classifier, and outputting a fault type. According to the method, through high-precision time-frequency focusing and multi-dimensional feature fusion, the fault recognition accuracy and robustness are remarkably improved, and online diagnosis of multiple typical faults can be achieved only through current signals.

The embodiment of the invention provides a dual-frequency base station antenna, and belongs to the technical field of antenna equipment, the dual-frequency base station antenna comprises a grounding plate, two dielectric substrates are laminated on the grounding plate, each dielectric substrate is correspondingly provided with a radiation unit, and the radiation signal frequency bands of the two radiation units are different; the radiation unit comprises a radiation patch and a metal through hole array which are arranged on the dielectric substrate, the radiation patch is a fan-shaped patch, the metal through hole array is arranged around the arc-shaped edge of the radiation patch, and the metal through hole array, the grounding plate, the dielectric substrate and the radiation patch jointly form a substrate integrated waveguide resonant cavity; the substrate integrated waveguide resonant cavity is configured to couple and excite the radiation patch after being externally excited so as to radiate a signal of a preset frequency band through the radiation patch. The dual-frequency base station antenna provided by the embodiment of the invention has excellent pilot frequency isolation performance, and can realize bandwidth expansion and radiation optimization effects.

The invention discloses a spectral interference system resolution improving method and system, and the method comprises the steps: building an ISE-Net end-to-end deep neural network model, enabling the convolution kernel size of an efficient channel attention module of the ISE-Net end-to-end deep neural network model to be adaptively determined according to the number of input channels, and constructing a mapping relation between narrowband and broadband interference signals; and generating an ideal narrowband signal and a double-bandwidth target signal according to a spectral interference physical formula, defining a loss function by minimizing deviation between model output and the target signal, updating parameters and dynamically adjusting a learning rate by using an AdamW optimizer until model loss is converged, and completing data generation and training. An input narrowband signal horizontal axis is converted to a corresponding frequency domain axis, and is subjected to time shifting and intensity scaling preprocessing to adapt to the model. A signal processing flow suitable for a single / multi-layer structure is constructed, a bandwidth expansion signal is obtained through decomposition, expansion and reconstruction, and the resolution of a spectrum interference system is improved. The method has the advantages of high calculation efficiency, high generalization and flexible deployment.

This disclosure provides methods, components, devices and systems for dynamic bandwidth expansion. Some aspects more specifically relate to one or more configuration- or signaling-based mechanisms according to which various wireless communication devices, such as access points (APs) or stations (STAs), may communicate via an expanded bandwidth. For example, a total available bandwidth may be divided into different wireless channels, with each wireless channel being associated with a respective basic service set (BSS) of a respective AP. A wireless communication device may establish a communication link associated with a first wireless channel (the first wireless channel being associated with a BSS bandwidth of the wireless communication device) and, in accordance with one or more criteria, may communicate via a bandwidth that includes the first wireless channel associated with the BSS bandwidth and one or more other wireless channels outside of the BSS bandwidth.

An antenna assembly includes a balanced antenna feed configured to receive a differential signal and a ground plane. The assembly further includes a first conductive dipole arm in planar alignment with a surface of the ground plane and a second conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the first conductive dipole arm. The assembly further includes a first feedline in electrical communication with the first conductive dipole arm and the balanced antenna feed and a second feedline in electrical communication with the second conductive dipole arm and the balanced antenna feed. The assembly further includes a conductive wall (“H-wall”) in electrical communication with the ground plane and having an end adjacent to, and physically separate from, the second conductive dipole arm. The H-wall has an axial length orthogonal to the ground plane.

The invention provides a millimeter wave antenna, a millimeter wave base station antenna and a millimeter wave isolation structure. The antenna comprises a parasitic radiation layer, a main radiation layer and a grounding layer which are sequentially stacked from top to bottom, the parasitic patch on the parasitic radiation layer and the main radiation patch on the main radiation layer can respectively form resonance points and are coupled, so that the bandwidth expansion of the antenna is realized; the upper surface of the grounding layer is provided with a coupling structure, and the lower surface is provided with a feed structure. The feed structure and the coupling structure achieve a dual-polarization mode through two vertically-arranged microstrip gaps, feed signals can be transmitted and coupled to the main radiation layer more effectively, and the wide-beam antenna performance is achieved. Therefore, the antenna has good radiation efficiency in the frequency bands of N257, N258 and N261, and better meets the application requirements of 5G millimeter wave base station antennas. Meanwhile, excellent isolation performance is also realized; in addition, the base station antenna has the advantages of being simple in design and process.

The invention discloses a bandwidth expansion circuit, a chip and a receiver, and belongs to the technical field of analog integrated circuits. The bandwidth expansion circuit comprises a signal compensation equalization module, a first bandwidth boosting module and a second bandwidth boosting module, the signal compensation equalization module is used for carrying out equalization amplification on a high-frequency component in the received first signal and outputting an equalized and amplified second signal; the second bandwidth boosting module is used for feeding back the extracted low-frequency component to the output end of the signal compensation equalization module so as to lower the low-frequency component in the second signal; the first bandwidth boosting module is used for offsetting high-frequency attenuation of the capacitive load on the second signal after the low-frequency component is reduced, and sending a third signal after offsetting the high-frequency attenuation through the signal output end; and the second bandwidth boosting module is also used for extracting a low-frequency component from the third signal. Through the combination of various technologies of compensating channel attenuation, counteracting capacitance influence, lowering low-frequency components and the like, the effective improvement of the circuit bandwidth is realized.

The embodiment of the invention provides a receiving front-end amplifier, a signal amplification method and network equipment. The receiving front-end amplifier comprises a current mode logic unit which is used for converting a first single-ended input signal into a differential signal according to a reference voltage locally generated by the receiving front-end amplifier; the negative capacitance unit is used for expanding the bandwidth of the differential signal; and the conversion unit is used for converting the differential signal after bandwidth expansion into a second single-ended signal and outputting the second single-ended signal. According to the embodiment of the invention, based on the current mode logic, negative capacitance and differential-to-single-ended three-stage circuit design, the problems of insufficient bandwidth, reduced signal quality and over-high power consumption during single-ended signal input can be effectively solved, and the effect of enhancing the high-speed signal processing performance is achieved.

The invention discloses a signal processing method and apparatus, an electronic device and a storage medium. The method comprises the steps of obtaining a to-be-processed original signal; inputting the original signal into the target correction model, and determining a correction parameter corresponding to the original signal; the target correction model is used for correcting the original signal on the actual frequency response curve to the target frequency response curve; the target bandwidth of the target frequency response curve is greater than the actual bandwidth of the actual frequency response curve; correcting the original signal based on the correction parameter to obtain a corrected signal; and compensating the corrected signal based on a preset distortion compensation model to obtain a processed signal. In the embodiment of the invention, through a digital signal processing technology, the original signal on the actual frequency response curve is fitted to the target frequency response curve with a larger bandwidth through the target correction model, and then correction distortion compensation is carried out, so that bandwidth expansion of the signal of the existing equipment can be realized.

The embodiment of the present application provides a receiving front-end amplifier, a signal amplification method and network equipment. The receiving front-end amplifier comprises: a current mode logic unit, which is used for converting a first single-ended input signal into a differential signal according to a reference voltage generated by the receiving front-end amplifier locally; a negative capacitance unit, which is used for expanding the bandwidth of the differential signal; and a conversion unit, which is used for converting the differential signal with the expanded bandwidth into a second single-ended signal and outputting the second single-ended signal. Through the embodiment of the present application, based on the current mode logic, the negative capacitance and the differential-to-single-ended three-stage circuit design, the problems of insufficient bandwidth, signal quality decline and excessive power consumption when the single-ended signal is input can be solved effectively, and the performance of high-speed signal processing is enhanced.

In certain aspects, a voltage buffer includes a first source follower having an input and an output, and a second source follower having an input and an output. The voltage buffer also includes a first transistor, wherein a drain of the first transistor is coupled to the output of the first source follower, and a first coupling capacitor coupled between a gate of the first transistor and the input of the second source follower. The voltage buffer also includes a second transistor, wherein a drain of the second transistor is coupled to the output of the second source follower, and a second coupling capacitor coupled between a gate of the second transistor and the input of the first source follower. The voltage buffer further includes a current source coupled to a source of the first transistor and a source of the second transistor.

This utility model discloses a visible light communication transmitting device, relating to the field of visible light communication technology. The visible light communication transmitting device includes a format conversion circuit, a bandwidth expansion circuit, a level bias circuit, and a modulation and LED array circuit connected in sequence. The input terminal of the format conversion circuit receives a high-speed differential electrical signal, and the output terminal outputs a serial electrical signal. The input terminal of the bandwidth expansion circuit receives the serial electrical signal, and the output terminal outputs an inverted high-speed signal. The input terminal of the level bias circuit receives the inverted high-speed signal, and the output terminal outputs a forward high-speed signal. The input terminal of the modulation and LED array circuit receives the forward high-speed signal, and the output terminal outputs visible light. This utility model can reduce the hardware cost of the device while ensuring a large bandwidth for the visible light communication device.

According to the terminal antenna bandwidth and isolation cooperative enhancement method, an antenna is arranged on the edge of a dielectric substrate, one face of a metal patch is attached to the inner side of a rear cover of terminal equipment, the other face of the metal patch is opposite to one face of the dielectric substrate (middle frame), and the metal patch is composed of a plurality of sub metal patches. On one hand, the sub-metal patches are effectively excited by the antenna to realize bandwidth expansion, and on the other hand, the sub-metal patches counteract an original coupling path to realize isolation enhancement. The metal patches are arranged on the periphery of the antenna, and the size and the position of the metal patches are optimized, so that the antenna can realize wide bandwidth and high isolation under the condition of extremely small clearance and distance. The method can be widely applied to the fields of mobile communication terminal equipment, Internet of Things terminal equipment and the like.

The present disclosure provides methods, components, devices, and systems for 480 and 640 megahertz (MHz) transmission in Wi-Fi. Some aspects are more particularly directed to including a bandwidth field and a bandwidth extension field in a preamble of a physical layer protocol data unit (PPDU), the bandwidth field and the bandwidth extension field jointly indicating that a channel bandwidth of the PPDU is a continuous 480 MHz channel bandwidth or a 640 MHz channel bandwidth. In some aspects, parameters of the PPDU may be defined based on the PPDU occupying a 480 MHz or 640 MHz bandwidth. The parameters may include, for example, a tone plan, an allowed puncturing pattern, signaling of a puncturing plan, signaling of a resource element allocation, a short training field, a long training field, a pilot signal sequence, a phase shift, a segment parser, and / or spectrum masking.

Signal mechanisms are described for performing dynamic bandwidth expansion (DBE) at an access point (AP). In one embodiment, the AP and stations (STAs) exchange signals indicating their respective DBE capabilities (e.g., whether DBE is supported, maximum dynamic BW, etc.). Later, the AP (or a network controller) can determine to perform DBE. For example, the load on the AP may jump because the AP is located in a conference room or an event center. To provide additional BW, the AP (or RRM) can determine to perform DBE to increase the bandwidth available to the AP. To do so, the AP transmits a DBE announcement to inform the STAs. This announcement can include information such as bandwidth, center frequency, whether a subchannel is punctured, etc.). The AP and STAs can then use the expanded bandwidth.

Disclosed is an optical transmitter that makes it possible to simultaneously realize the expansion of a limited band of a DAC and a simplified configuration. In the optical transmitter, the band expansion of an electrical region is limited to the double thereof, the result is combined with a band expansion of N times an optical region, and it is possible to omit multiplication clock circuits, large optical filters, and the like by means of specific digital signal processing. As a result of the simplified configuration, it is possible to provide an optical transmitter whereby a discretionary optical signal of which the band is extended 2N times beyond a limited DAC operating bandwidth is output. The specific digital signal processing includes filtering the following by a filter coefficient corresponding to the configuration of the optical transmitter: a digital division signal obtained by band division of a target signal to be generated; and a folded digital division signal of the digital division signal. The band expansion of the optical region can be flexibly expanded by means of the number of branches in an optical modulation unit. The present invention can also be easily applied to the generation of polarization-multiplexed light.

This disclosure provides a digital transmitter, relating to the field of transmitter technology. It includes: a baseband data generation unit for multi-phase output of baseband data; and a basic unit including an I-channel mixer and a Q-channel mixer. The I-channel mixer performs mixing processing on the multi-phase outputs of the positive-phase I-channel baseband data and the negative-phase I-channel baseband data, while the Q-channel mixer performs mixing processing on the multi-phase outputs of the positive-phase Q-channel baseband data and the negative-phase Q-channel baseband data. The positive-phase outputs of the I-channel and Q-channel mixers are respectively connected to the positive-phase RF input of the digital transmitter, and the negative-phase outputs of the I-channel and Q-channel mixers are respectively connected to the negative-phase RF input of the digital transmitter. This disclosure simplifies the circuit structure of traditional digital transmitters and enables effective bandwidth expansion. Furthermore, by introducing multi-tap filtering for the baseband data, better spectrum shaping can be achieved.

This invention discloses a microwave absorber and its fabrication method. The microwave absorber includes multiple absorber units, each of which includes a dielectric layer and a patterned carbon-based conductive layer formed on the dielectric layer. The carbon-based conductive layer includes a central pattern and four peripheral patterns surrounding the central pattern. The central pattern includes a pair of parallel first vertical line segments and a first horizontal line segment connecting the middle of the first vertical line segments. Each first vertical line segment connects to two adjacent peripheral patterns. Each peripheral pattern includes a pair of parallel second vertical line segments and a second horizontal line segment connecting the middle of the second vertical line segments. The first vertical line segments connect to the second vertical line of one peripheral pattern and extend to the second horizontal line segment of another peripheral pattern. This microwave absorber facilitates bandwidth expansion and exhibits good broadband reflection suppression.

The present disclosure relates to bandwidth extension in multi-AP cooperation in a wireless LAN system. According to embodiments of the present disclosure, a method performed by a first AP in a wireless LAN system comprises the steps of: receiving, from a second AP, information about an available bandwidth of the second AP; transmitting, to the second AP, information about an available bandwidth of the first AP, wherein the available bandwidth of the first AP is greater than the available bandwidth of the second AP; receiving, from the second AP, a transmission opportunity (TXOP) sharing frame including information about an allocation interval within a period of a TXOP obtained for the available bandwidth of the second AP; and on the basis of at least one subchannel outside of the available bandwidth of the second AP being in an idle state within the available bandwidth of the first AP, transmitting a frame in the allocation interval through an extended bandwidth including the at least one subchannel and the available bandwidth of the second AP for which the TXOP is obtained.

The invention discloses a wireless optical communication system adopting an amplitude limiting amplification method, which relates to the technical field of wireless optical communication and comprises a transmitting subsystem and a receiving subsystem. The transmitting subsystem is used for generating a serial signal, processing the serial signal, converting the serial signal into an optical signal and transmitting the optical signal; and the receiving subsystem is used for receiving and converting the optical signal into a current signal, converting the current signal into a signal in a voltage form, amplifying the signal, performing waveform shaping and effective bandwidth expansion on the amplified signal through the nonlinear amplitude limiting characteristic of a bandwidth expansion module, and decoding and recovering the signal after bandwidth expansion. According to the invention, the bandwidth of the system is directly expanded by using the nonlinear amplitude limiting characteristic of the amplitude limiting amplifier, so that Gbps-level transmission is realized, and the rate bottleneck of the traditional LED system is overcome. Complex transmitting end equalization is not needed, the design is simplified, the robustness is enhanced, and the stability requirement of a satellite-borne environment high-speed link is met.

An apparatus for generating a bandwidth extended signal from an input signal includes a patch generator and a combiner. The input signal is represented for first and second bands by first and second resolution data, respectively, the second resolution being lower than the first. The patch generator generates first and second patches from the first band of the input signal according to first and second patching algorithms, respectively. A spectral density of the second patch generated using the second patching algorithm is higher than a spectral density of a first patch generated using the first patching algorithm. The combiner combines both patches and the first band of the input signal to obtain the bandwidth extended signal. The apparatus scales the input signal according to the first and second patching algorithms or scales the first and second patches, so that the bandwidth extended signal fulfills a spectral envelope criterion.

The application provides a bandwidth expansion method and device based on Rydberg atoms. The bandwidth expansion method comprises processing a received original signal to obtain a plurality of microwave signals corresponding to the original signal, wherein the plurality of microwave signals comprise a first microwave signal and a second microwave signal; performing mixing processing on the first microwave signal by a first atomic gas chamber to obtain a first bandwidth signal, and performing mixing processing on the second microwave signal by a second atomic gas chamber to obtain a second bandwidth signal; and synthesizing the first bandwidth signal and the second bandwidth signal by using a frequency division multiplexing method to realize bandwidth expansion. According to some embodiments, different Rydberg final states are prepared by using microwave signals of different frequencies, and the original signal is decomposed into a plurality of signals by using a frequency division multiplexing technology to realize multi-channel data transmission by loading the signals into the microwave signals, thereby realizing high-bandwidth multi-channel data transmission communication and bandwidth expansion.

Shear wave phase velocity is estimated from measurements of shear wave motion obtained using ultrasound shear wave elastography or other suitable elastography techniques. Shear wave dispersion curves are generated using a combined generalized Stockwell transform and slant wave number-frequency analysis. A modified version of the S-transform is used to control the time-frequency resolution of a time-frequency decomposition of a signal.

The invention discloses a direct-current-bias-free high-power LED visible light signal transmission method and system, and relates to the technical field of optical communication, and the method comprises the steps: carrying out 64QAM-OFDM modulation and IQ modulation on original audio and video data, carrying out AC coupling peak-to-peak value extraction and DC component filtering, and then carrying out single-power-supply amplification and pre-equalization; and a driving positive voltage signal is generated to drive a high-power LED to emit light, and an optical communication signal is generated. Through a low-loss alternating-current coupling transmission mode, the modulated real signal peak-to-peak value is subjected to coupling transmission and single positive power supply amplification, so that the signal is changed into positive voltage to control the LED light intensity and form an LED optical communication signal, direct-current voltage does not need to be introduced into a digital domain, the problem of bandwidth reduction is avoided, and the signal transmission efficiency is improved. The direct-current bias voltage of the LED can be kept stable, the LED works in a linear modulation area, bandwidth expansion is carried out through the pre-equalization circuit, and the functions of LED illumination and high-speed communication can be considered.

The embodiment of the invention relates to a communication method, communication equipment and a communication system. The communication method comprises the following steps: an AP determines a first wireless frame; wherein the first wireless frame comprises an operation parameter of the AP in a dynamic bandwidth extension (DBE) mode; and sending the first wireless frame, thereby realizing DBE operation parameter interaction between the AP and the STA, providing a basis for realizing an efficient and reliable DBE operation mode, and improving the spectrum utilization rate and throughput.

The embodiment of the invention provides a microstrip antenna and an antenna array. The microstrip antenna comprises a single-layer radiation patch and a multi-layer medium, wherein the single-layer radiation patch is provided with an open slot, the center of the open slot is overlapped with the center of the single-layer radiation patch, and the multi-layer medium is used for carrying out coupled feeding on the single-layer radiation patch under the condition of being excited, so that the problem that the unit size is relatively large due to the fact that the bandwidth is expanded through a lamination scheme such as a parasitic patch and the like in the related technology is solved; according to the embodiment of the invention, the design of the single-layer patch and the concentric open slot is adopted, the overall thickness of the antenna is reduced, the broadband working characteristic is effectively realized while the unit miniaturization is ensured, the emission load weight is reduced, and the emission cost is reduced.

An apparatus for generating a bandwidth extended signal from an input signal includes a patch generator and a combiner. The input signal is represented for first and second bands by first and second resolution data, respectively, the second resolution being lower than the first. The patch generator generates first and second patches from the first band of the input signal according to first and second patching algorithms, respectively. A spectral density of the second patch generated using the second patching algorithm is higher than a spectral density of a first patch generated using the first patching algorithm. The combiner combines both patches and the first band of the input signal to obtain the bandwidth extended signal. The apparatus scales the input signal according to the first and second patching algorithms or scales the first and second patches, so that the bandwidth extended signal fulfills a spectral envelope criterion.

This invention discloses a music bandwidth expansion method based on auditory perception attention generative adversarial networks (GANs). The method comprises two parts: training and prediction. The prediction part uses the trained network model to complete the bandwidth expansion task. The training part includes the following steps: Step 1, data preprocessing: preprocessing the original music dataset to obtain high-frequency music signals and corresponding low-frequency music signals as training sample pairs; Step 2, model architecture design: training the training sample pairs from Step 1 to obtain a GAN model. The GAN model includes a generator for generating sample data and a multi-discriminator for determining the source of the input sample data. This invention incorporates a multi-discriminator into the network model, which to some extent avoids the problem of overly smooth high-frequency components in the expanded spectrogram.