47 results about "Bandwidth limitation" patented technology

The invention discloses an ultra-wideband circulator based on a periodic modulation topology circuit, and belongs to the technical field of microwave and radio frequency nonreciprocal circuits. The working bandwidth range of the circulator is widened, and non-reciprocal transmission is achieved through non-magnetic materials. A time sequence control unit is respectively connected with a Floquet topology circuit layer, a clock signal driving module, a reset signal driving module and a start signal driving module; the Floquet topology circuit layer is respectively connected with a first coupling port, a second coupling port and a third coupling port; the other ends of the first coupling port, the second coupling port, the third coupling port, the clock signal driving module, the reset signal driving module and the starting signal driving module are respectively grounded; the Floquet topology circuit layer adopts a six-layer parallel network structure, and each layer of network structure comprises a coupling capacitor and three N-type MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switches. The advantages of the switched capacitor structure are utilized, and the signal processing capacity which is high in integration level, small in size and capable of breaking through delay-bandwidth limitation is achieved.

In various examples, methods and systems are provided for sampling and transmitting the most useful information from a radar signal representing a scene while staying within the computational and storage confines of a standard automotive radar sensor and the bandwidth constraints of a standard communication link between a radar sensor and processing unit. Disclosed approaches may select a patch of frequency bins that correspond to radar signals based at least on proximities of the frequency bins to one or more frequency bins corresponding to at least one peak and / or detection point in the radar signals. Data representing samples corresponding to the patch of frequency bins may be transmitted to the processing unit and applied to one or more machine learning models in order to accurately classify, identify, and / or track objects.

The invention discloses an intelligent shock absorption and noise reduction control method for rail transit, and belongs to the technical field of rail transit noise and vibration control. The method aims at solving the problems that traditional passive control measures are poor in adaptive capacity and limited in frequency band, and effective prospective offset is difficult to achieve due to system delay and inaccurate reference signals in existing active control. The method comprises the following steps: synchronously acquiring vibration and noise signals through a sensor array; calculating the contribution weight of vibration to noise by using a cross-domain modal correlation module based on an attention mechanism, and fusing the features; predicting an evolution sequence of vibration and noise in a specific time period in the future by adopting a long-short-term memory network model; synthesizing a target reference signal according to the prediction sequence, and generating an anti-phase control signal through an adaptive filtering algorithm; finally, it is ensured that the total delay of the system is smaller than the feedforward advance time, and an actuator is driven to achieve accurate foresight counteracting. The method is mainly used for improving the self-adaptive capacity and the control effect of the rail transit damping and noise reduction system.

In various examples, methods and systems are provided for sampling and transmitting the most useful information from a radar signal representing a scene while staying within the computational and storage confines of a standard automotive radar sensor and the bandwidth constraints of a standard communication link between a radar sensor and processing unit. Disclosed approaches may select a patch of frequency bins that correspond to radar signals based at least on proximities of the frequency bins to one or more frequency bins corresponding to at least one peak and / or detection point in the radar signals. Data representing samples corresponding to the patch of frequency bins may be transmitted to the processing unit and applied to one or more machine learning models in order to accurately classify, identify, and / or track objects.

The present application relates to the technical field of noise processing, and discloses a noise whitening method, device, equipment and storage medium, the method comprises the following steps: constructing an error function based on an equalization signal and a training sequence; calculating based on the error function to obtain gradient information; updating the tap coefficient of the noise whitening filter based on the gradient information to obtain a target tap coefficient; whitening the colored noise based on the target tap coefficient. The present application updates the tap coefficient of the noise whitening filter by formulating the error function and calculating the gradient, solves the problem that when the channel equalization technology is used to overcome the bandwidth limitation, the equalization enhances the colored noise, leads to uneven noise power spectrum, and thus reduces the IM-DD transmission rate, realizes the whitening of the colored noise, makes the power spectrum flat, and thus significantly improves the performance of the IM-DD system and increases the communication capacity.

A video encoding apparatus including a reconstruction buffer with fixed size and / or bandwidth limitations, and an associated video encoding method. Specifically, a video encoding apparatus includes a data buffer and video encoding circuitry. Encoding of a first frame includes: deriving reference pixels of a reference frame from the reconstructed pixels of the first frame, and storing the reference pixel data in the data buffer for inter-frame prediction, wherein the reference pixel data includes information about the pixel values ​​of the reference pixels. Encoding of a second frame includes: performing prediction on coding units in the second frame to determine a target prediction factor for the coding unit. The prediction step performed on the coding unit includes: determining the target prediction factor of the coding unit based on whether a search range for the prediction factor of the coding unit for the reference frame includes at least one reference pixel of the reference frame that cannot be accessed by the video encoding circuitry.

The invention relates to a method and a system for video transmission based on millimeter wave, 5G and Wi-Fi hybrid networking, a uniform resource pool of millimeter wave, 5G and Wi-Fi is constructed through a network interface abstraction layer, paths are dynamically allocated for transmission units by combining video stream segmentation and utilizing a multipath transmission protocol, and aggregation and parallel transmission of heterogeneous network bandwidth resources are realized. Compared with a single network or a simple main and standby scheme, the method breaks through the physical bandwidth limitation of a single frequency band, effectively solves the problems of spectrum congestion and signal shielding in a large-space multi-user scene, and greatly improves the total throughput and transmission stability of the system, thereby supporting the concurrent transmission of XR video streams with higher resolution.

This invention discloses a circularly polarized selective wireless energy harvesting rectifier, comprising a metasurface module, a power combining module, and a rectification module. The metasurface module includes multiple absorbing units arranged in a periodic array. Each absorbing unit includes a resonant structure on the front side of a dielectric substrate and a metallized via penetrating the substrate. The resonant structure is a conductive ring with two offset openings, one of which contains a capacitive element. The power combining module includes a power combining network disposed on the back side of the dielectric layer of the power combining network. The input terminal of the rectification module is connected to the output terminal of the power combining module. This rectifier simultaneously solves the two core problems of polarization mismatch and bandwidth limitation. It integrates polarization selection, wideband energy harvesting, and high-efficiency rectification functions. Its core function is to efficiently selectively absorb and convert right-hand circularly polarized waves while generating strong reflection of left-hand circularly polarized waves to suppress interference.

Bandwidth adaptation in a transmission circuit is provided. The transmission circuit includes a power amplifier circuit that amplifies a radio frequency (RF) signal based on a modulated voltage, an envelope tracking integrated circuit (ETIC) that generates the modulated voltage based on a modulated target voltage, and a transceiver circuit that generates the RF signal and the modulated target voltage. The RF signal may have a wide modulation bandwidth but the ETIC may have a lower bandwidth limit, which can cause distortion in the modulated voltage and the RF signal. In this regard, the transceiver circuit is configured to generate the modulated target voltage in a lower bandwidth than the bandwidth limit when the modulation bandwidth of the RF signal exceeds the bandwidth limit of the ETIC. As such, the transmission circuit can process the RF signal across the wide modulation bandwidth without causing distortion in the RF signal.

This reception device comprises: a reception unit that receives, as a reception signal, a transmission signal transmitted from a transmission device; a matching filter unit that limits the bandwidth of the reception signal to the bandwidth of the transmission signal; and a Doppler shift estimation / correction unit that estimates and corrects the Doppler shift of the reception signal. The matching filter unit is disposed downstream of the Doppler shift estimation / correction unit.

The invention relates to a method and a device for optimizing a large language model interactive service for a weak network environment, which are particularly suitable for regions with limited network infrastructures. The method comprises the following steps: establishing an interactive self-adaptive hierarchical service architecture of a large language model, and dynamically adjusting LLM context management and generation control according to a network condition; establishing a semantic local cache mechanism oriented to large language model interaction, and performing local storage and offline response of LLM specific key data at a user equipment side; establishing an asynchronous fault-tolerant processing mechanism of large language model interaction, and providing an interaction continuity guarantee when the network is abnormal; and establishing a transmission optimization strategy of the large language model, and optimizing the transmission characteristics of the data. According to the method, the special problems of response delay, interaction interruption, bandwidth limitation and the like of interactive application of the large language model in a weak network environment are solved, and the service stability and the user interaction fluency of the large language model are effectively improved.

The invention discloses a PolSAR two-dimensional dynamic bandwidth variational mode decomposition method based on Bayesian parameter selection, a computing device and a computer readable storage medium, and the method comprises the following steps: carrying out the preprocessing of a scattering matrix of polarized SAR data, and extracting the intensity information of six polarized channels; updating each modal component through an alternating direction multiplier method, and performing two-dimensional inverse Fourier transform on each modal component; constructing a Bayesian optimization objective function, and updating an optimal evaluation value based on a Gaussian process and an expectation improvement function; outputting the optimal modal number when the maximum evaluation frequency is reached; and taking the optimal mode number as a parameter, and obtaining a final decomposition result through two-dimensional dynamic bandwidth variational mode decomposition. The method has the advantages that the two-dimensional variational mode decomposition algorithm is rewritten, so that the method has the adaptive characteristic of bandwidth limitation; secondly, a Bayesian optimization design objective function is introduced on the basis of two-dimensional dynamic bandwidth variational mode decomposition, so that a key parameter K can be adaptively selected;

The application discloses a self-adaptive voice-text hybrid communication method and system based on an ad hoc network, and belongs to the technical field of communication transmission. In the method, a voice signal is collected at a sending end, link quality is evaluated according to a channel state, a corresponding coding mode is determined according to the link quality, compression coding is carried out, and the compression-coded data packet is transmitted to a receiving end; at the receiving end, the compression-coded data packet is received, the data packet is decoded, and the decoded data is played. The application is used for solving the technical problems of bandwidth limitation, insufficient anti-interference, response lag and system heterogeneity in a complex environment, and provides reliable communication support for intelligent data transmission.

A self-tuning, resonant cavity transmitter combiner joins multiple RF transmitters and combines their signals onto a single transmission line. An additional tuning element is added to the junction of the signal paths to overcome the bandwidth limitations of the transmission lines joining the signal paths. An algorithm was developed to optimize the RF performance of the combiner by sampling the RF signals at various points in the RF circuit.

The present application relates to the technical field of terahertz spectrum detection, in particular to a kind of directly encoded waveform's atomic terahertz spectrum detection method and device, the detection method uses " direct modulation coding + algorithm reconstruction", the bandwidth of the terahertz frequency domain spectrum obtained overcomes the narrow bandwidth defect of atomic detection, the frequency coverage range of its spectrum is determined by the bandwidth of terahertz modulator, is not limited by the intrinsic narrow bandwidth of atomic detector, realizes the terahertz spectrum fast and efficient detection of more than GHZ bandwidth, can be applied to gas component detection, substance concentration analysis, nondestructive testing and other fields, has good application value.

The invention provides a dynamic compensation method for a temperature-pressure composite sensor, which comprises the following steps of: acquiring amplitude-frequency and phase-frequency characteristic curves through frequency response test, determining bandwidth limitation and phase lag characteristics, and designing a digital compensation filter by adopting an inverse system method to improve amplitude flatness and phase linearity in a preset frequency band; meanwhile, linear subintervals are divided according to piecewise nonlinear characteristics, a dynamic compensation model is established, and gain and phase correction coefficients are extracted; and according to a measured value, switching subinterval models in real time and adjusting a filtering coefficient to ensure a dynamic tracking characteristic. According to the invention, the optimized frequency response characteristic is finally integrated to an output signal processing flow, and the measurement precision and response speed of the temperature and pressure sensor under complex working conditions are significantly improved.

The embodiment of the invention provides a signal processing device, a signal processing method, electronic equipment and a storage medium. The device comprises a signal processing circuit and a digital filter associated with attenuation compensation of an input signal, and the signal processing circuit is used for determining a bandwidth limit range of the digital filter based on a signal parameter associated with the input signal and a device parameter of the signal processing device; the signal processing circuit is also used for configuring a bandwidth limit value of the digital filter, and the bandwidth limit value is determined based on the bandwidth limit range; and the digital filter is used for carrying out attenuation compensation on the input signal based on the bandwidth limit value to obtain an output signal.

The invention particularly relates to a high-power microwave short pulse in-pulse phase change measuring method and device, and the method comprises the steps: carrying out the coupling processing of a microwave excitation pulse signal, and obtaining a first branch signal and a second branch signal; performing delay processing on the first branch signal to obtain a reference signal for intra-pulse phase comparison; performing phase drift on the second branch signal to obtain a measurement signal for intra-pulse phase comparison; and comparing the phase of the reference signal with the phase of the measurement signal, and visualizing the comparison result. Through distribution, amplification, delay and comparison processing of excitation signals, real-time phase measurement of high-power short-pulse signals can be realized under the condition that the structure of a signal main path is not changed. The device has the advantages of being simple in structure and high in measurement precision, can effectively avoid errors caused by instrument bandwidth limitation and insufficient sampling rate in a traditional method, and is suitable for phase stability evaluation and intra-pulse characteristic analysis in a high-power microwave system.

The present invention relates to a multipath-capable communication device (10), comprising: - at least a first communication path (70) and a second communication path (71) configured to provide data traffic to be transmitted, - at least one control unit (30), - a multipath scheduler (26) configured to distribute data traffic to the first communication path (70) and / or the second communication path (71) based on a first path metric, - a first traffic shaper (24) configured to limit the total bandwidth allocated to the communication device (10) to a first adjustable bandwidth limiting value, - a second traffic shaper (21) configured to limit the bandwidth allocated to the first communication path (70) to a second adjustable bandwidth limiting value,and / or - a third traffic shaper (22) configured to limit the bandwidth allocated to the second communication path (71) to a third adjustable bandwidth limiting value, wherein at least one control unit (30) is configured to control the multi-path scheduler (26), the first traffic shaper (24), and the second traffic shaper (21) and / or third traffic shaper (22).

The application provides an adaptive code rate allocation method based on a space-time graph neural network. The method comprises the following steps: S1: panoramic tiling step; S2: dynamic space-time graph construction step; S3: space-time graph neural network inference step; S4: bandwidth weight generation step; S5: agent local collaborative decision step; S6: global verification and unified fine-tuning step; and S7: encoding and transmission step. The method provided by the application can automatically converge the bandwidth allocation without additional control delay, and can still preferentially allocate resources to the area that a user is about to see in the case of bandwidth limitation, so as to ensure that the picture is clear, stable and low-delay in the instant of turning head.

The utility model relates to an AI server PCB high speed transmission structure, including dielectric layer and two difference signal lines, two difference signal lines are located in dielectric layer, the distance between two difference signal lines is 3mil 4mil, the width of each difference signal line is 15mil 17mil, the utility model discloses the difference signal line width is 15mil 17mil, the spacing control is at 3mil 4mil, combines dielectric layer design, realized the ultra -low differential impedance of difference signal line, under 30GHz frequency band, the insertion loss can reduce to within -1.1dB inch, breaks through the bandwidth limitation of traditional 85 ohm 100 ohm impedance design, makes the PCB can support single channel 400Gbps high speed signal transmission.

The invention relates to a method for measuring electrical properties of a semiconductor quantum dot material based on free carrier absorption. Comprising the following steps that pumping laser and continuous detection laser are sequentially emitted to the same position of a semiconductor sample to be detected, the power of the pumping laser is changed, the concentration of free carriers is subjected to nonlinear change, the nonlinear characteristic of the free carriers is closely related to the characteristics of excitons and carriers in quantum dots, and the concentration of the free carriers is detected. Transmitting light signal data at different powers are collected through a photoelectric detector, and the obtained data are recorded and processed to obtain electrical characteristic parameters of the detected semiconductor sample. The method is not influenced by the response time or bandwidth limitation of the photoelectric detector, the data processing is simple, and the measurement precision is high; the measuring device is simpler, and the equipment cost is low; the method is wide in application range, can be used for measuring quantum dot materials with deep energy level traps, and is particularly suitable for measuring quantum dot materials with more shallow energy level traps.

The present application relates to the technical field of control or regulation system, more particularly, to a kind of implementation method of multi-agent without speed measurement containing control device based on STM32.The method comprises: establishing the communication topology graph of multi-agent system;Determine the dynamics model of agent node and the containment control protocol without speed measurement;Build distributed hardware system platform based on STM32 microcontroller;Based on the above platform, build collaborative development environment with STM32CubeMX and Keil uVision5 as the core.The present application takes STM32 microcontroller as the core, directly calculates the control instruction of agent and drives execution, only needs its own and neighbor node position as control input, can efficiently and stably achieve containment control target, to solve the challenge of computing power, storage and bandwidth limitation faced when deploying distributed containment control on the hardware platform based on STM32 microcontroller.

The invention provides an inductor equalization type silicon-based traveling wave Mach-Zehnder modulator and a design method thereof, and relates to the technical field of photoelectron integration, the modulator introduces a micro-inductor structure connected in series with a PN junction into a traditional traveling wave electrode modulator to form a distributed RLC resonance unit, and the high-frequency response roll-off of a device is compensated by using the resonance peaking effect of the modulator, so that the performance of the device is improved. And the electro-optical bandwidth is improved. Preferably, a plurality of micro-inductor structures can be arranged along the traveling wave electrode in a segmented manner and are cascaded periodically, and each structure can be realized through different metal layers and is connected with the PN junction through a via hole. The design method of the modulator comprises the following steps of: accurately calculating a required inductance value and integrating the inductance value into layout design to realize bandwidth optimization. According to the scheme, on the premise that modulation efficiency is not remarkably sacrificed and optical loss is not increased, bandwidth limitation of a traditional silicon-based modulator is broken through, the scheme is compatible with a standard CMOS technology, and a key technical solution is provided for a next-generation high-speed optical communication system.

The application relates to the technical field of video conference software, in particular to a software conference system based on a Hongmeng operating system, which comprises a scheduling platform module arranged at a user terminal, the scheduling platform module is used for completing the registration and login of users, and is also used for completing call connection to complete the establishment of a conference; a Hongmeng terminal module arranged at the user terminal and connected with the scheduling platform module at each user terminal, the Hongmeng terminal module is used for initiating a conference to establish a point-to-point conference or a multi-party conference. The conference system of the application arranges the scheduling platform module at the user terminal, adopts a distributed design, solves the scheduling disaster recovery and bandwidth bottleneck problems through decentralization, so that regional video conferences can still be established under any node failure, bandwidth limitation and the like.

The application discloses a network diagnosis method, a network diagnosis device and a computer storage medium. The network diagnosis method comprises the following steps: in response to a bandwidth-limited signal, acquiring an output code rate of a current network and a network bandwidth parameter in a preset time interval, wherein the network bandwidth parameter comprises a transmissible data amount and a spectrum efficiency of the current network; determining whether the transmissible data amount is lower than the output code rate; if yes, determining whether the spectrum efficiency is lower than a historical spectrum efficiency; if yes, and a difference between the spectrum efficiency and the historical spectrum efficiency is greater than a first preset difference threshold, determining that a cause of the current network bandwidth limitation is channel attenuation. In the foregoing manner, the application can quickly determine the cause of the network bandwidth limitation based on the size of the transmissible data amount and the spectrum efficiency in the network bandwidth parameter, thereby improving the diagnosis efficiency of the network bandwidth.

A field-programmable analog array (FPAA) fabric includes a 6×6 matrix of configurable analog blocks (CABs). The implementation of programmable CABs eliminates the use of fixed analog subcircuits. A unique routing strategy is developed within the CAB units that supports both differential and single-ended mode circuit configurations. The bandwidth limitation due to the routing switches of each individual CAB unit is compensated for through the use of a switch-less routing network between CABs. Algorithms and methodologies facilitate rapid implementation of analog circuits on the FPAA. The proposed FPAA fabric provides high operating speeds as compared to existing FPAA topologies, while providing greater configuration in the CAB units as compared to switch-less FPAA. The FPAA core includes 498 programming switches and 14 global switchless interconnects, while occupying an area of 0.1 mm2 in a 65 nm CMOS process.

This invention discloses an ultra-wideband high-power single-pole double-throw switch circuit with adjustable isolation, belonging to the field of microwave integrated circuit technology. The first and second branches of this circuit have identical structural parameters and are symmetrical about the microstrip line MILN1. Both the first and second branches can function as either conducting or isolating branches. Therefore, one branch can be used as a conducting branch for low-insertion-loss transmission of the input signal, while the other branch acts as an isolating branch to block the input signal transmission, thus achieving both low insertion loss and high isolation for the entire circuit. Furthermore, by adjusting the control voltage of transistor Q7 in the reconfigurable stub, the isolation can be further improved and adjusted according to changes in the desired operating frequency band. In this invention's circuit, adjusting the isolation does not affect the switch's power capacity or the insertion loss of the other branch, solving the problems of bandwidth limitations on isolation and poor high-frequency isolation in high-power single-pole double-throw switches.

A pilot-assisted fiber length estimation (FLE) technique estimates chromatic dispersion for optical signals. The pilot-assisted FLE technique is agnostic to the modulation format of the optical payload and is resilient to polarization effects, bandwidth limitations, and signal shaping, thus enabling consistent performance across a wide range of operating conditions. A transmitter periodically inserts a known pilot sequence into an optical signal, and a receiver processes the pilot sequence to estimate the length of the optical fiber, or to estimate chromatic dispersion of the optical fiber, which is related to the fiber length.