113 results about "Bandwidth expansion" patented technology

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.

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 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.

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.

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.

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 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.

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.

An indication of a bandwidth expansion to be applied to a positioning signal, e.g. a positioning reference signal or a sounding reference signal, received at the apparatus, e.g. user equipment or base station, from a transmitter, e.g. base station or user equipment, is obtained 701, e.g. received from a network entity, and the positioning signal is received 702, wherein the positioning signal comprises a plurality of symbols in n sub-carriers. An expanded positioning signal is generated 703 based on the received positioning signal and the indication of the bandwidth expansion to be applied, and a time of arrival of the positioning signal is determined 704 based on the expanded positioning signal. The arrival time of the symbols may be frequency independent and the bandwidth expansion to be applied may be associated with a positioning signal received from a given transmitter. Generating the expanded positioning signal may comprise adding L sub-carriers to the n sub-carriers of the received positioning signal.

The application provides a band expansion method and system based on a generative adversarial network, a storage medium and an electronic device, and relates to the technical field of radar signal processing.The application realizes the fusion of multi-band radar signals and generates large-bandwidth radar signals by constructing a GAN network embedded with a lightweight UNet-like network.On the one hand, the lightweight UNet-like feature extraction network automatically extracts features from the original echo signal, which can facilitate the phase matching between sub-bands and avoid the processes of establishing a signal model and phase registration, and compared with a traditional algorithm, the application is simpler and more efficient.On the other hand, the GAN network can significantly improve the correctness of the fused signal through the game between the generator and the discriminator.In addition, the GAN network can expand the bandwidth while denoising, and even in the case of low signal-to-noise ratio of the original signal, the large-bandwidth signal can still be synthesized.

A non-access point multi-link device (non-AP MLD) determines a non-simultaneous transmit receive (NSTR) status of a pair of links setup with two respective APs affiliated with an AP MLD 110, the determining being based on frequency edges of operating channels of the two affiliated APs. The determining may comprise comparing a frequency difference between the nearest frequency edges of the operating channels of the two affiliated APs with a minimum frequency gap value specific to the non-AP MLD. The non-AP MLD may report the NSTR status of the link pair to the AP MLD, including reporting the NSTR status of the link pair upon the AP MLD activating dynamic sub-band operation (DSO), non-primary channel access (NPCA), or high efficiency subchannel selective transmission (HE SST) on one link of the pair at the non-AP MLD. One operating channel of the two affiliated APs may be an expended operating channel resulting from a Dynamic Bandwidth Expansion (DBE) mechanism, compared to a Basic Service Set (BSS) operating channel implemented by the affiliated AP in absence of DBE mechanism. [Figure 1]

The application provides a radio frequency microwave amplifier for expanding modulation bandwidth, and relates to the technical field of radio frequency microwave circuits.The amplifier comprises an active device current source end face parasitic capacitor, a first inductor, a first capacitor, a video bandwidth expansion circuit, an output circuit and a target load; the first end of the first inductor is connected with the first end of the active device current source end face parasitic capacitor and the first end of the output circuit respectively, and the second end of the first inductor is connected with the first end of the first capacitor and the first end of the video bandwidth expansion circuit respectively; the second end of the output circuit is connected with the target load; and the second end of the first capacitor is grounded.The application can effectively break through the limitation of traditional radio frequency microwave amplifiers in modulation bandwidth, so that the amplifier can process modulation signals in a wider frequency range, and meet the demand of modern communication systems for high-speed and large-capacity data transmission.

Dynamic Bandwidth Expansion (DBE) operation with Dynamic Subband Operation (DSO) may be provided. A computing device may operate in Dynamic Bandwidth Expansion (DBE). Also, the computing device may be operative in Dynamic Subband Operation (DSO). Then the computing device may use DSO over expanded Bandwidth (BW) of DBE for client devices that support DSO and DBE operation.

At a device (such as a user equipment), the provision, to a network element (such as a base station), of one or more parameters representative of capabilities of the device may be shown to allow the network element to customize signal generation parameters that are provided to the device. The customized signal generation parameters may be used, by the device, when generating signals destined for the network element or may be used, by the device, when decoding signals received from the network element. The customized signal generation parameters may be selected from among a group of parameters, where the group includes a bandwidth extension ratio, a roll off factor and a guard band factor.

The invention relates to the technical field of amplifier noise interference suppression, in particular to an interference signal suppression method of a high-working-bandwidth low-noise amplifier chip, which comprises the following steps: based on the distribution of the confusion degree of each sub-signal in the confusion degree of all sub-signals in the corresponding frequency band and the confusion degree, determining the interference signal of the high-working-bandwidth low-noise amplifier chip; determining a frequency domain characteristic value; and determining a comprehensive characteristic value based on the distance from the observation window where each sub-signal is located to the current moment and based on the distribution of the signal characteristic value of the frequency band corresponding to each sub-signal in the signal characteristic values of all the frequency bands, and suppressing an interference signal in the time domain signal at the current moment by adopting a self-adaptive filtering algorithm. According to the low-frequency noise amplifier, the limitation of a series negative feedback mode on the bandwidth expansion of the low-frequency noise amplifier and the interference of fixed threshold denoising on the signal quality in the low-noise amplifier are solved, and the working bandwidth range and the signal quality of the low-frequency noise amplifier are improved.

The application discloses a high video bandwidth radio frequency power device, which comprises a carrier flange, at least one amplifier arranged on the carrier flange, wherein the amplifier comprises a power transistor, and the amplifier further comprises an inner matching circuit and a video bandwidth expansion circuit module arranged on the carrier flange; the inner matching circuit comprises an input matching capacitor arranged on an input end and an output matching capacitor arranged on an output end; the video bandwidth expansion circuit module comprises a carrier plate, and an expansion circuit is arranged on the carrier plate; and the comprehensive equivalent inductance from the output end of the power transistor to the grounding end in the video bandwidth expansion circuit module and the comprehensive equivalent capacitance of the source-drain parasitic capacitance of the power transistor and the output matching capacitor form a resonance loop. The video bandwidth of the radio frequency power device is improved, the assembly complexity is reduced, and the device cost is not substantially increased.

Described herein are methods to enable wireless cellular operation in unlicensed and lightly licensed, (collectively referred to as license exempt spectrum). Cognitive methods are used to enable use of unlicensed bands and / or secondary use of lightly licensed bands. Wireless devices may use licensed exempt spectrum as new bands in addition to the existing bands to transmit to a wireless transmit / receive unit (WTRU) in the downlink direction, or to a base station in the uplink direction. The wireless devices may access license exempt spectrum for bandwidth aggregation or relaying using a carrier aggregation framework. In particular, a primary component carrier operating in a licensed spectrum is used for control and connection establishment and a second component carrier operating in a licensed exempt spectrum is used for bandwidth extension.

An electronic device includes a common pin pair and a bandwidth expansion circuit. The electronic device receives or transmits a signal through the common pin pair. The signal is a differential signal. The bandwidth expansion circuit is electrically coupled with the common pin pair and comprises a first inductor pair, a second inductor pair, a first capacitor pair and a second capacitor pair. The first inductor pair is electrically connected between the common pin pair and the node pair. The second inductor pair is electrically connected with the first inductor pair through the node pair. The first capacitor pair is electrically connected between the node pair and the grounding point. The second capacitor pair is electrically connected between the common pin pair and the grounding point. The first inductor pair comprises a first inductor and a second inductor. The second inductor pair comprises a third inductor and a fourth inductor. A coupling effect exists between the first inductor and the second inductor. A coupling effect exists between the third inductor and the fourth inductor.