28 results about "Multi rate" patented technology

A system for activating multi-rate optical network units (ONUs) includes an optical network having an optical line terminal (OLT) optically coupled to a plurality of ONUs, including one or more multi-rate ONUs configured to support multiple upstream rates. During discovery when other ONUs are permitted to transmit in the same quiet window, a multi-rate ONU that supports a higher rate is instead configured to send a discovery response at a sufficiently low rate so as not to require training of an equalizer, thereby allowing for a short preamble for the discovery response. Thereafter, during a quiet window for ranging when only the multi-rate ONU will be transmitting to prevent data collisions, the multi-rate ONU is transitioned to a higher rate and transmits a message with a sufficiently long preamble to train an equalizer at the OLT.

The application provides a kind of multi-rate adaptive compatible coherent demodulation method and device, belong to coherent demodulation technical field;The method comprises: the pre-treatment of coherent light signal;Adopt the double-stage mechanism of coarse identification and fine identification combination to automatically identify the rate and modulation format of signal, wherein fine identification utilizes lightweight CNN classifier;According to the recognition result, adaptively configure the core demodulation parameters such as sampling rate, equalizer order, operation bit width and carrier recovery algorithm;Through the unified configurable modular architecture, complete synchronization, equalization, carrier recovery and other demodulation processing;Soft decision is made to demodulated signal and real-time monitoring performance index;According to the monitoring result, closed-loop dynamic fine tuning is carried out on demodulation parameter;The application realizes the automatic identification and compatible demodulation of 100G / 200G / 400G and PM-QPSK / PM-16QAM signal, and is suitable for general coherent acquisition platform, intelligent optical network receiver and multi-rate optical communication tester.

The invention provides a multi-rate network intelligent route planning method based on minimum media occupancy time, and belongs to the field of multi-rate networks and route planning. According to the method, firstly, an ant colony algorithm is adopted, the mobility of nodes is introduced, a stable and optimal MPR set is selected, and whole network topology information is obtained; then giving a network link weight based on media occupancy time; and finally, selecting an optimal route based on a simulated annealing algorithm of multi-agent optimization. According to the method, the traditional method of selecting the routing based on the minimum hop count is abandoned, the media occupation time is defined to comprehensively evaluate the network link weight, the time delay of the network is reduced, and the throughput of the network is increased; and secondly, routing is selected by adopting a simulated annealing algorithm based on multi-agent optimization, so that the optimization capacity is improved, the network dynamics is adapted, and the robustness of the network is enhanced.

This application discloses an LVDS adaptive frame synchronization system, comprising: a transmitting end: a clock generation module providing multi-rate clocks; a data parallel-to-serial conversion module converting parallel data into a high-speed serial bit stream under clock control; a multi-functional auxiliary channel parallel-to-serial conversion module interleaving and encoding auxiliary control information and synchronization information into a composite bit stream; and an LVDS driver group converting signals into differential signals for transmission. The receiving end: an LVDS receiver group converts differential signals into single-ended signals, including multiple data signals, one auxiliary channel signal, and one half-rate clock signal. A serial-to-parallel conversion and synchronization control module uses a half-rate clock to perform DDR sampling of the data and auxiliary channel signals. Synchronization information is extracted by sampling on the falling edge of the auxiliary channel signal, and auxiliary control information is extracted by sampling on the rising edge. A synchronization detection unit obtains the capture sequence from the synchronization information, and a numerically controlled delay unit calculates the delay correction amount based on the mapping relationship between the capture sequence and the correction signal to delay the data, thereby achieving adaptive frame synchronization.

The application provides a multi-rate switching error code testing device and a working method thereof. The error code testing device comprises a control terminal, a control module, a signal generating unit and a signal receiving unit. The control terminal is used for receiving a multi-rate switching test configuration command of a user, encapsulating the multi-rate switching test configuration command as a control command and issuing the control command to the control module. The control module is used for receiving the control command issued by the control terminal, scheduling the signal generating unit and the signal receiving unit to execute an operation corresponding to the control command. The signal generating unit is used for preloading a test signal pattern parameter matched with a current target rate from a multi-rate parameter library according to the control command, generating a test signal according to the test signal pattern parameter and sending the test signal to a device under test. The signal receiving unit is used for receiving an output signal output by the device under test according to the test signal, and performing error code statistics on the output signal. The error code testing device can improve test efficiency.

An adaptable, multistage, multi-rate digital predistortion system that can increase the accuracy of the distortion applied to a power amplifier input signal is disclosed. Further, the digital predistortion system can be implemented using a reduced circuit area by reducing a number of coefficients used by the models applied to generate the distortion compensation signal. Further, the system can implement an improved digital predistortion adaptation engine that improves an adjacent channel leakage ratio of the digital predistortion system. Moreover, the system can compensate for non-linear impairments due to analog / RF circuits and systems and improve at least the following metrics: Error vector magnitude (EVM), adjacent channel leakage ratio (ACLR), spectrum emission mask (SEM), and power consumption of the circuits and systems. An example of circuits and systems is radio frequency power amplifier (RF PA).

The invention discloses a self-adaptive multi-rate gear air-to-air communication method, which comprises the following steps of: respectively installing a host and a responder of a microwave radar on an active aircraft and a target aircraft, and performing data interaction between the active aircraft and the target aircraft by the host and the responder through air-to-air communication in a rendezvous and docking process of the active aircraft and the target aircraft; the host and the responder transmit and receive according to an inter-satellite communication measurement integrated frame, the host or the responder for transmitting air-to-air communication is called as a transmitting end, the host or the responder for receiving air-to-air communication is called as a receiving end, a QPSK modulation scheme is adopted, and an I path serves as a measurement branch and is used for measuring data and transmitting low-rate communication data; and the Q path is used as a communication branch and is used for transmitting communication data at different high-speed gears. According to the invention, measurement and communication integration is realized on the basis of high-precision measurement, and the problem of multi-path tracking under multi-rate communication is solved.

The invention provides a multi-rate asynchronous fusion photoelectric tracking and laser radar constraint correction recapture device and method, which are suitable for photoelectric detection and stable tracking of a maneuvering target. The recapture device comprises a photoelectric tracking subsystem, a laser radar subsystem, a timestamp and synchronization module, an asynchronous fusion processing module, a state machine, a scanning control module, a pointing control module and a pointing execution mechanism. According to the recapture method, time sequence inconsistency caused by low-frequency ranging delay is eliminated through multi-rate asynchronous fusion and timestamp delay compensation, the tracking stability and recapture efficiency in a sheltered or lost scene can be improved, and the method is used for solving the problem that a photoelectric tracking system is difficult to realize stable tracking in complex environments such as backlighting and weak textures at night. And the technical problem of how to quickly recapture the target in a short-time shielding / quick maneuvering or view field edge access scene of the target is solved.

The invention relates to the technical field of material mechanical property testing, in particular to a multi-rate tensile test method based on speed correction and self-adaptive adjustment. The method comprises the following steps: firstly, determining a theoretical tensile speed according to collision regulations, and obtaining a real strain rate of a material through a primary test; and correcting the theoretical speed in combination with the scale distance of the sample. Starting from the corrected speed, by comparing the change of the maximum stress of the material at the adjacent rates, adaptively selecting different proportions to adjust the subsequent test speed step by step, and iteratively carrying out until a preset span ratio termination condition is met. Through speed planning and feedback adjustment of the system, an effective stress-strain curve which covers a wide strain rate range and is free of data redundancy can be efficiently obtained with the least test times, the test efficiency and the data validity are remarkably improved, and accurate and reliable material model input is provided for vehicle collision simulation.

The embodiment of the application discloses a dynamic phasor representation DC power system random transient analysis method, relates to the power electronic field of the DC power system, and can reflect system characteristics caused by source-load random excitation conditions and multi-rate simulation, and balance the contradiction between precision and efficiency. The application comprises the following steps: obtaining DC power system parameters and setting initial parameters; obtaining circuit models of two types of lumped elements in the DC power system; establishing a dynamic phasor model of a converter station in the DC power system and obtaining a dynamic companion circuit of the converter station; using the circuit models of the two types of lumped elements and the dynamic companion circuit of the converter station, establishing a model of the DC power system; obtaining node voltage equations of the DC power system; updating a node admittance matrix and an injected current vector according to changes in a switching function of the converter station; and converting dynamic phasors output by the model of the DC power system into instantaneous values.

Methods and systems of processing audio data with a multi-stage audio front end model is provided. A one-dimensional audio waveform is received as input and processed using a multi-stage audio frontend model to convert the one-dimensional waveform into a two-dimensional matrix representing features of the audio waveform. The multi-stage learnable audio frontend model is configured to apply a first filterbank to the audio waveform to generate a first time-frequency representation of the audio waveform; apply a first decimation filter to the audio waveform to generate a first decimated audio input; apply a second filterbank to the first decimated audio input to generate a second time-frequency representation of the audio waveform; and stack the first time-frequency representation and the second time-frequency representation together to generate the two-dimensional matrix.

The invention discloses a multi-rate shaping filter structure based on a parallel lookup table, and relates to the technical field of satellite communication. According to the minimum sampling resolution of a set system and the number of taps of a shaping filter, a corresponding coefficient of an FIR filter is designed and stored in a parallel mode; after the design is completed, according to the accumulated step length of the configured NCO, generating a pulse of a target symbol rate, sending a modulated and mapped symbol point into a register according to the pulse, generating an address based on the current value of the NCO, reading a stored coefficient, and after the reading is completed, multiplying and accumulating based on the read coefficient and data in the register; therefore, the accuracy of communication filtering is improved.

This invention discloses an elastic control method for linear uncertain systems based on multi-rate state measurement information. The method includes establishing a linear dynamic model and a state estimation model based on multi-rate state measurement information of the controlled system; acquiring state measurement information of the controlled system; resetting the state of the state estimation model based on the state measurement information; designing an elastic control law based on the linear dynamic model and the state estimation model; inputting control commands based on the elastic control law into the actuator to stabilize the state of the controlled system; and controlling the system with a period T. s The above process is repeated at intervals until control ends. This invention can maintain stable system operation even when there are parameter uncertainties, actuator errors, and irregular updates of state measurement information.

A system for activating multi-rate optical network units (ONUs) includes an optical network having an optical line terminal (OLT) optically coupled to a plurality of ONUs, including one or more multi-rate ONUs configured to support multiple upstream rates. During discovery when other ONUs are permitted to transmit in the same quiet window, a multi-rate ONU that supports a higher rate is instead configured to send a discovery response at a sufficiently low rate so as not to require training of an equalizer, thereby allowing for a short preamble for the discovery response. Thereafter, during a quiet window for ranging when only the multi-rate ONU will be transmitting to prevent data collisions, the multi-rate ONU is transitioned to a higher rate and transmits a message with a sufficiently long preamble to train an equalizer at the OLT.

The application provides a three-level inverter multi-rate control method, for any control axis of alpha beta 0: a voltage target value is subtracted from an actual value to obtain a voltage deviation, and a subscript is a control axis code; a repetitive controller is used as an input quantity, and an output result obtained is added to obtain; a state feedback controller is based on phase currents of alpha beta 0 and a control signal at a previous moment to output a control signal, and finally, the inverter is controlled to operate via 3D-SVPWM. The three-level inverter multi-rate control method can improve the dynamic performance and phase characteristics of the system by introducing the state feedback controller under the multi-rate control framework, configuring the closed-loop poles of the inverter discrete model, and thereby improving the stability of the system under the condition of downsampling.

The invention discloses an FPGA-CPU (Field Programmable Gate Array-Central Processing Unit) hybrid electromagnetic transient real-time simulation system and an FPGA-CPU hybrid electromagnetic transient real-time simulation method for a power electronic power system. Fast and slow dynamic cooperative calculation is realized by adopting multi-rate decoupling. The CPU side solves a power grid main network in real time with a large-step fixed period, the FPGA side solves the fast dynamic electrical state of the converter containing the switching device in real time with a small step, and the control quantity and the return current are exchanged through a step interface. In order to improve the cross-rate control consistency, the CPU predicts controller input at each large-step starting point, calculates a next large-step controlled quantity predicted value in a mirror image instance based on a controller state snapshot, and constructs a controlled quantity prior sequence aligned with a small step for the FPGA to call. In order to cope with return current missing measurement in hard real-time deadline, a graded compensation mechanism is provided, linear extrapolation is adopted in the first missing measurement step, and phase-continuous compensation current is generated in the continuous missing measurement step through three-phase sine second-order recursion based on synchronous frequency, so that continuous stepping of a main network is guaranteed, and system robustness is improved.

The utility model relates to a multi-rate compatible vehicle-mounted Ethernet-to-USB (Universal Serial Bus) device, which comprises a standard USB3.0 interface connected to test equipment and a computer end and used for transmitting data and receiving a power supply; the converter is used for receiving the data signal and the Ethernet signal and converting the USB signal and the RGMII signal; the Ethernet transceiver is used for receiving and transmitting a physical layer of data; a connector to which an Ethernet cable is connected; and the dial switch is used for selecting a working mode of the detection equipment and a network data transmission rate, and the working mode comprises a master mode and a slave mode. According to the invention, when data transmission connection is carried out between the Ethernet and the test equipment, the Ethernet and the test equipment can be connected through a conventional USB interface, independent power supply is not needed, and the use convenience is improved.

The invention relates to the field of servo control, in particular to a visual servo control method for a multi-rate system, and the method comprises the steps: analyzing the abnormal tendency of a controlled target through determining an operation matching value, an operation time delay characterization value and a time delay dynamic characterization value, and judging whether a prediction model needs to be constructed or not; based on the position time sequence, a Gaussian regression process is established, and construction of a prediction model is completed by predicting a time point of a moment; analyzing the accuracy of a model prediction result; constructing a state predictor to predict the control period of the multi-rate system, and judging whether the predicted data needs to be interpolated or not by combining the control period of the prediction model and the control frequency; and recording the prediction model and the state predictor, and applying the prediction model and the state predictor to a servo control process. According to the method, the prediction model is constructed, the time delay influence is processed, observation and prediction of the system state are completed, the high-frequency control period is selected for interpolation, and the control performance and the dynamic characteristic are improved.

The invention relates to the technical field of signal integrity, in particular to a storage chip interface signal integrity enhancing method supporting multiple rates. The method comprises the following steps: acquiring a multi-rate interface integrity index, and performing classified management on acquired data; based on the collected and classified multi-rate interface integrity indexes, the association rule of different interface rates and the integrity indexes is analyzed, and an interface signal core enhancement target under each rate is output; constructing a quantitative mapping model, specifically configuring interface parameters according to an interface signal core enhancement target, switching different rates to verify an optimization effect, and outputting an optimal configuration strategy under each rate; according to the method, integrity indexes under multiple rates are obtained and classified, the association rule of the rates and the indexes is analyzed to determine a core enhancement target, and then based on the target, parameters are configured through a quantitative model and iterative optimization verification is carried out, so that accurate enhancement of the interface signal integrity of the storage chip under a multi-rate scene is realized.

The invention discloses a multi-rate network data transmission method and system based on a permutation method, and belongs to the technical field of channel coding. The method comprises the steps that a basis matrix is designed according to an expansion factor of the quasi-cyclic LDPC code, elements of the basis matrix are generated by a position function, and the position function is defined as a mathematical function on an integer pair set; row and column permutation optimization is carried out on the basis matrix and comprises row permutation optimization and column permutation optimization, and row and column permutation aims at maximizing girth and minimizing the shortest ring number; based on the optimized basis matrix, generating a check matrix of the multi-rate quasi-cyclic LDPC code, and encoding and decoding data; and realizing data transmission according to the dynamic adaptation of the code rate. According to the method, multi-rate switching is supported through the unified basis matrix template, so that the storage overhead is reduced; linear complexity coding is realized by using a quasi-cyclic structure, and hardware implementation is friendly; the row and column permutation optimization ensures the girth maximization, and the decoding performance is improved; and the requirements of low time delay and high reliability are met.

The disclosure relates to a system for performing multi-rate convolution in a neural network is disclosed. The system may include a multi-rate convolution engine that may include a plurality of Multiply and Accumulator (MAC) modules. Each of the plurality of MAC modules may be configured to perform a convolution operation by applying a filter on image data, to generate convolution data. The system may further include a local controller coupled to the multi-rate convolution engine. The local controller may be configured to activate the multi-rate convolution engine to perform a multi-rate convolution. The multi-rate convolution may include receiving a first input signal indicative of a convolution rate, a feature size, and a network load, and selecting a set of MAC modules from the plurality of MAC modules, based on the convolution rate and a filter size, and causing the set of MAC modules to parallelly perform the convolution operation.

The application provides a soft measurement method, device and medium for industrial multi-rate acquisition, which comprises the following steps: collecting historical data in an industrial process, and dividing the historical data to obtain a plurality of sampling rate data; respectively extracting features of different sampling rate data, and dimensionally normalizing each scale feature; obtaining each bidirectional cross attention matrix according to each scale feature and a query source, and fusing the bidirectional cross attention matrices to obtain a bidirectional cross attention feature; dynamically calibrating the bidirectional cross attention feature based on a historical feature to obtain a soft measurement model; and inputting to-be-predicted data in the industrial process into the soft measurement model to obtain a quality variable prediction result in the industrial process. The method, device and medium can solve the problem that the existing soft measurement method of an industrial system has insufficient feature extraction, insufficient cross-scale association mining and limited utilization of historical target trend information when processing multi-sampling rate data, thereby resulting in low prediction accuracy of the quality variable in the industrial process.

The invention discloses a verification test method for an M-PHY layer of a UFS. The verification test method comprises the following steps: step 1) setting up a test environment; configuring a multi-rate adaptive test engine; configuring an inter-channel interference simulation system; configuring a protocol perception type state machine verifier; the verification test method for testing the M-PHY layer of the UFS comprises the steps of (1) carrying out an M-PHY layer, (2) carrying out a multi-rate adaptive test, (3) carrying out an inter-channel interference simulation test, and (4) carrying out protocol perception type state machine verifier.The verification test method for testing the M-PHY layer of the UFS can verify the data integrity and reliability of UFS equipment on the M-PHY layer.

The application relates to the technical field of electric digital data processing, and provides a lossless transmission method for multi-rate high-bandwidth real-time data flow, which is applied to a system containing an FPGA and a processor. The method caches and integrates multiple source data flows in a first-level buffer according to respective bandwidths into a burst data block on the FPGA side; writes the data block burst into an off-chip DDR serving as a second-level buffer in a write-priority strategy; dynamically quantifies the back pressure degree by monitoring the difference between the read and write states of the DDR in real time; dynamically cooperates data flow-out according to a flow control signal from the processor and a DDR back pressure evaluation result; reads data from the DDR burst to a third-level buffer when the condition is allowed, and burst-transmits data to the processor through a communication interface when the data quantity meets the condition. Through three-level buffering and dynamic cooperation, the application effectively solves the contradiction between high continuity output on the FPGA side and the uncertainty of the processing capacity and the link state on the processor side, and realizes high-throughput and lossless data transmission in a fluctuating back-end scene.

The invention provides a multi-rate hierarchical learning control method for a dense medium coal preparation process under unreliable communication. The method comprises the following steps: step 1, carrying out system screening and processing on historical operation data; 2, a basic loop controller is designed through model predictive control; step 3, constructing a heavy medium coal preparation whole process generalized controlled object containing two layers of dynamic characteristics; 4, performing optimization solution on the set value gain of the dense medium suspension liquid density control loop; and 5, updating the weight parameter of the performance index of the operation layer by using the operation data generated by the controlled system online, substituting the updated weight parameter into the step 4 again, and circularly executing the step 4 and the step 5 until a set value meeting an optimization target is obtained. According to the method, a data-driven performance index weight parameter setting and dense medium density optimal set value optimization solving method is designed, so that the optimal dense medium separation effect is obtained, and the method has very important significance for improving the economic benefits of a coal preparation plant.