28 results about "Adaptive equalizer" patented technology

The invention discloses an adaptive equalization method for combined compensation of carrier frequency offset and channel linear damage. The adaptive equalization method specifically comprises the following steps: taking data subjected to matched filtering, clock synchronization, orthogonality and normalization as input signals; for an input signal, using the filter linear damage compensation weight vector and the frequency offset compensation weight coefficient to obtain output data of the filter; obtaining an expected value of filter output data, and calculating to obtain a theoretical error value of adaptive equalization; and obtaining a filter weight vector used for next adaptive equalization according to the theoretical error value. The adaptive equalization method for combined compensation of carrier frequency offset and channel linear impairment is suitable for a coherent optical transmission system, uses an adaptive equalizer to compensate signal frequency offset and channel linear impairment at the same time, does not need an additional frequency offset estimation algorithm, meets the advantages of multiple rates and multiple modulation formats, and is high in convergence speed and high in robustness. And the calculation complexity is low.

The invention discloses a method and a device for determining working parameters of an adaptive equalizer. The method comprises the following steps: selecting a first initial value and a first offset of an adaptive equalizer in a chip according to a current link rate and cable information; determining a first working parameter of the adaptive equalizer according to the first initial value and the first offset; receiving signal feedback information of a receiving end corresponding to the chip is acquired; when determining that the signal transmission quality is lower than a preset value according to the received signal feedback information, reselecting a second initial value and a second offset of the adaptive equalizer, and obtaining a second working parameter of the adaptive equalizer according to the second initial value and the second offset, and the signal transmission quality is not lower than the preset value when the adaptive equalizer operates according to the second working parameter. According to the method and the device, the technical problem that in the prior art, due to the fact that self-adaptive balanced insertion loss changes exist in a chip under different cable lengths and cable types, frequent manual parameter adjustment is needed, and the operation is relatively tedious is solved.

The utility model relates to the technical field of optical modules, in particular to a BNC interface optical module for 12G-SDI, and the electric port side of the optical module is connected with a BNC connector; the output side of the BNC connector is connected to the optical module transmitter, the optical module transmitter comprises a self-adaptive equalizer, a transmitting clock data recovery unit, a driving circuit and an optical transmitting end which are connected in sequence, and the optical transmitting end is connected to the optical module receiver through an optical cable; the output side of the optical module receiver is connected to the input side of the BNC connector, and the optical module receiver comprises an optical receiving end, an amplifier, a received clock data recovery unit and a cable driver which are connected in sequence. And the optical fiber connection of the ST interface is adopted at the optical port side of the optical module, so that the transmission distance is prolonged to 10km from 75m of a radio frequency coaxial cable.

An apparatus for use by a coherent receiver is configured to perform obtaining a first set of coefficients indicating a first filter in an adaptive equalizer of the coherent receiver, wherein the first filter is an adaptive Multi-Input Multi-Output, MIMO, filter with N taps in each branch, wherein N is an integer number; determining a further set of coefficients indicating a MIMO filter with a single tap in each branch based on the first set of coefficients; determining a first matrix based on the further set of coefficients; orthogonalizing the first matrix, thereby obtaining an orthogonalized matrix; determining a state-of-polarization based on at least part of the orthogonalized matrix.

The tap coefficient control circuit (12) sets the tap coefficient updated by the second tap coefficient updater (11) as the initial value of the convergence action of the tap coefficient of the first digital filter (13) updated by the first tap coefficient updater (14), arranges the tap coefficients set as the initial value in descending order according to the degree of contribution to the convergence action of the first tap coefficient updater (14), judges the tap coefficients above the upper specified number as valid, judges the tap coefficients below the specified number as invalid, sets the tap coefficients of the first digital filter (13) corresponding to the tap coefficients judged to be invalid to zero and does not use them in the calculation of the first tap coefficient updater (14) until the next judgment result comes out.

The invention provides a satellite TLK2711 data flow protocol matching and automatic drawing method and system, and the method comprises the steps: monitoring the transmission condition of data frames flowing through a TLK2711 interface at fixed time intervals, calculating the transmission delay in real time, and automatically setting a reasonable delay threshold value. In addition, through signal feature analysis and data packet analysis, a specific high-speed transmission protocol and requirements thereof are automatically judged, and the specific high-speed transmission protocol is automatically matched with a standard high-speed transmission protocol. And if the self-adaptive equalization aspect is not matched, the system compares the processed signal with an expected signal, and continuously adjusts the weight of the equalizer by using an LMS algorithm until the error is minimum or fluctuates in an acceptable range, thereby finally realizing the automatic adjustment of the equalizer parameters. In conclusion, automatic drawing is carried out through software, transmission delay, high-speed transmission protocol matching and self-adaptive equalizer adjustment are automatically adjusted, and efficient monitoring and intelligent optimization of the satellite data flow are achieved.

An optical receiver includes a dispersion compensation circuit that compensates for chromatic dispersion of an optical transmission line, for an electric signal corresponding to an optical signal received through the optical transmission line, an adaptive equalization circuit that adaptively compensates for residual chromatic dispersion remaining due to insufficient compensation in the dispersion compensation circuit, for a compensated electric signal by the dispersion compensation circuit, and a monitor circuit that monitors a dispersion slope of the residual chromatic dispersion based on a tap coefficient of the adaptive equalizer circuit. The dispersion compensation circuit compensates for the chromatic dispersion based on a monitor value of the dispersion slope.

The invention discloses a quality evaluation method and device for a cable for a television serial data interface, and relates to the technical field of communication data processing, a pseudo-random binary sequence and an ill-conditioned code are generated through a linear feedback shift register, and the pseudo-random binary sequence and the ill-conditioned code are converted into serial data through a serializer after being selected by a gating switch. The amplitude of serial data is adjusted through the adjustable attenuator, the serial data is input into a target cable for transmission, and the transmitted signal is processed by the rate adaptive equalizer and analyzed into parallel data by the deserializer. A pseudo-random code checker and a ill-conditioned code checker are adopted for error rate analysis, HD-SDI is gradually upgraded to 3G-SDI and UHD-SDI, and whether the cable meets the corresponding rate requirement or not is judged through dual detection logic. The method comprises the following steps: recording error code initial attenuation values at different rates, constructing a model based on an attenuation formula, calculating beta and gamma to judge the theoretical feasibility of 3G-SDI and UHD-SDI, actually measuring if the theoretical feasibility is feasible, calculating the maximum transmission distance if the theoretical feasibility is not feasible, and finally generating evaluation information containing the applicable rate and the like.

The invention provides an adaptive equalizer circuit and an operation method thereof. The adaptive equalizer circuit includes an amplifier circuit and an adaptive circuit. The amplifier circuit is coupled to the adaptive circuit. The amplifier circuit receives an input signal. The amplifier circuit provides a compensation signal to the adaptive circuit based on an input signal. The adaptability circuit provides a compensation setpoint and a feedback signal to the amplifier circuit based on the compensation signal. A low-frequency response and a high-frequency gain of the amplifier circuit are adjusted based on the feedback signal and the compensation setpoint, respectively.

The application discloses a kind of cable quality evaluation method and device for television serial data interface, it is related to communication data processing technical field, the present application generates pseudo-random binary sequence and ill-conditioned code by linear feedback shift register, after being selected by gating switch, it is converted into serial data by serializer.The amplitude of serial data is adjusted by adjustable attenuator, input target cable transmission, after transmission, signal is processed by rate adaptive equalizer, and is parsed into parallel data by deserializer.Pseudo-random code and ill-conditioned code checker are used for error rate analysis, from HD-SDI gradually upgrade to 3G-SDI, UHD-SDI, whether cable meets corresponding rate requirement is judged by double detection logic.Record the initial attenuation value of error rate under different rates, construct model based on attenuation formula, calculate β and γ to judge the theoretical feasibility of 3G-SDI, UHD-SDI, if feasible, then measured, if not feasible, then calculate the maximum transmission distance, finally generate evaluation information containing applicable rate etc..

The invention discloses a high-stability KVM (Keyboard Video Mouse) switcher based on an FPGA (Field Programmable Gate Array) architecture, which relates to the technical field of switchers and comprises a main control module, a display interface module, a signal switching module, an EDID (Extended Display Identifier) processing module, a power management module and a communication control module, according to the main control module, a Xilinx Zynq-7020 FPGA chip is adopted as a control core, functional module programming is achieved through a hardware description language, and IP cores with different functions are supported to be dynamically loaded. The display interface module is connected with the main control module, adopts a TI TPS65987DP controller to realize a full-link native DP1.4a interface, and comprises a dual-channel HBR3 high-speed transmission link and a self-adaptive equalizer; the signal switching module is connected with the display interface module, and adopts an Analog Devices ADG7336 switching chip to realize the switching of a plurality of paths of signals; the EDID processing module is connected with the main control module and adopts a self-developed EDID analysis engine to realize an intelligent EDID self-learning function; and the power management module is connected with the main control module, and 9-36V DC wide voltage input is realized by adopting a TI TPS5430 power chip.

To provide a wireless communication system that performs tap coefficient pulling-in processing of a decision feedback adaptive equalizer at a high speed.SOLUTION: A wireless communication system performs: a first process in which a data frame DF_B is transmitted from a station B at timing delayed by an offset symbol number M of a symbol number B the same as a synchronization word SW_A in response to a data frame DF_A transmitted from a station A, and a tap coefficient is pulled in for a combined data frame DF_A+DF_B obtained by combining the data frames DF_A and DF_B; a second process of performing an equalization process based on equalizer input and the tap coefficient to obtain an approximation value of a symbol of block data contained in combined block data as equalizer output; and a third process of calculating an error between a hard decision value of the equalizer output and the equalizer output, and updating the tap coefficient to the latest value using the calculated error, the tap coefficient, and new equalizer input. The wireless communication system repeats the second process and the third process until all approximations of the symbol of the block data are output.SELECTED DRAWING: Figure 7

The application provides a double-loop adaptive equalizer circuit based on power comparison, which comprises an equalizer, an input end of the equalizer being connected with a differential data stream; an adjusting circuit, an input end of the adjusting circuit being electrically connected with an output end of the equalizer; a high-frequency adaptive loop, which is used for detecting high-frequency power and low-frequency power of an output signal of the equalizer; a low-frequency adaptive loop, which is used for detecting high-frequency power and low-frequency power of an output signal of the adjusting circuit; the high-frequency adaptive loop and the low-frequency adaptive loop respectively generate high-frequency control signals and low-frequency control signals by comparing the high-frequency power and the low-frequency power of the output signals of the equalizer and the adjusting circuit, so as to adjust the high-frequency power and / or the low-frequency power of one or two signals, and make the high-frequency power and the low-frequency power of the two signals tend to be the same respectively. The equalizer has strong adaptive equalization capability and is not easily affected by external factors.

The present application belongs to the field of equalizer compensation, especially an adaptive equalizer compensation method for vehicle audio, aiming at the problem that the existing method is not convenient for effectively adaptive gain compensation of the noise generated during vehicle driving, thereby affecting the listening effect of the people in the vehicle, the present application proposes the following scheme, which comprises the following steps: S1: preparing a compensation system, the compensation system comprises a noise monitoring module and a multimedia audio acquisition module, the noise monitoring module is connected with a noise acquisition module, the noise acquisition module is connected with a spectrum analysis module, the spectrum analysis module is connected with a model establishment module, the model establishment module is connected with a database module, and the multimedia audio acquisition module is connected with a loudness monitoring module, the present application can effectively adaptive gain compensation of the noise generated during vehicle driving in the use process, thereby effectively guaranteeing the listening effect of the people in the vehicle.

To provide an optical receiver capable of accurately compensating for signal distortion without increasing the number of tap stages of an adaptive equalizer.SOLUTION: An optical receiver includes: a receiver to receive an optical signal input via an optical transmission path; a converter to convert an electrical analog signal corresponding to the optical signal into a digital signal; a first compensator to fixedly compensate for a first signal distortion of the digital signal based on a first tap coefficient; a second compensator to adaptively compensate for a second signal distortion of the digital signal that has been compensated by the first compensator, based on a second tap coefficient with a second tap stage number different from a first tap stage number of the first compensator; and a controller to acquire the digital signal output from the first compensator before being input to the second compensator, calculate a third tap coefficient that adaptively compensates for the second signal distortion with the first tap stage number, and update the first tap coefficient of the first compensator based on the first tap coefficient and the third tap coefficient.SELECTED DRAWING: Figure 3

A system (210, 230, 240, 250, 260 and / or 280) for selecting an equalizer setting of an equalizer (210) to equalize a signal received via a communication link. Starting from a first (e.g., minimum) equalizer setting and a threshold voltage VTH,MID near the mid-eye voltage of the equalized output signal, the system estimates the amplitude of the inner eye of the equalized output signal by comparing the equalized output signal with a series of threshold voltages. If the amplitude of the equalized output signal is less than an ideal value, the system dynamically increases the equalizer setting. The system converges quickly to the equalizer setting of the communication link because the system does not use each equalizer setting to compare the output signal at each voltage offset, but only evaluates the equalizer settings required to select the equalizer setting for the communication link and only uses the voltage offsets required to evaluate each equalizer setting.

The invention relates to the technical field of TWS earphone adaptive equalizer methods, in particular to a head tracking-based TWS earphone adaptive equalizer method, which comprises the following steps of: (1) extracting perception characteristics from head position information through a neural network, and mapping the perception characteristics to a head-related transfer function (HRTF); (2) estimating the optimal linear coefficient of each filter bank by using a DQN method; (3) establishing a cooperation relationship and a competition relationship among a plurality of DQN competitors with different hyper-parameters; (4) introducing distributed federated learning to collect feedback suggestions of different users; and (5) setting of an equalizer of the TWS earphone is adjusted, the relation between the complex head motion and the HRTF is converted into a learnable neural network model, and intelligent adjustment of equalizer parameters is realized through a deep reinforcement learning algorithm, so that the system can provide customized audio experience for each user.

The present invention belongs to the technical field of coherent optical communication, and specifically relates to a polarization mode dispersion adaptive equalizer based on approximate calculation. The adaptive equalizer of the present invention is a 16-channel parallel equalizer, and each channel adopts a 9-1 equalizer structure; in this parallel equalizer, a parameter sharing scheme is adopted, and all multipliers are implemented using approximate multipliers; the present invention can reduce the parameters of the equalizer by 38.9%, greatly reduce the scale of the parameters, and reduce the computational complexity; this multiplier can reduce the number of full adders by about 44.6% while ensuring that the average absolute error loss is only 0.31; it can greatly reduce the area and power consumption while ensuring a very small loss of calculation accuracy; the comprehensive results show that compared with the fixed-point structure, the area of the approximate base equalizer is increased by 27.86%, and the power efficiency is increased by 37.88%.

This invention relates to the field of KVM switching control and intelligent video transmission, specifically to a seamless switching control system and method for KVM switches based on reinforcement learning. The system includes: collecting physical layer state data of the current data link and the target data link, including cable impedance attenuation values, bit error rate before adaptive equalizer compensation, historical timing data readout time, estimated environmental signal-to-noise ratio, and terminal configuration mode; inputting the physical layer state data into a reinforcement learning decision engine based on a deep Q-network, outputting link compensation parameters and pre-loaded timing parameters; performing a virtual handshake operation based on the pre-loaded timing parameters to generate a source-end link hold state; completing the reconstruction of underlying physical layer parameters and cross-matrix switching in the vertical blank area of ​​the video stream, and updating the model reward value based on the retrained state of the switched link; this invention achieves adaptive seamless switching control for high-speed video links such as display ports.

A receiver (20) includes an adaptive equalizer (24), a processor (36) and a decoder (32). The adaptive equalizer is configured to equalize a signal. The processor is configured to estimate a gain correction, which compensates for attenuation of the equalized signal by the equalizer due to noise present in the signal. The decoder is configured to decode the equalized signal. At least one of (i) equalization of the signal by the adaptive equalizer and (ii) decoding of the equalized signal by the decoder, is based on the gain correction.

This invention discloses a low-complexity symbol synchronization method and system. The method includes: S1, preprocessing the received signal; S2, inputting the preprocessed signal to the adaptive equalizer of the adaptive equalization module for equalization processing. The adaptive equalizer equalizes the signal by updating the tap weights. In the steady-state phase, its tap weight distribution tracks the fractional delay changes caused by SFO (Segmented Time Delay); S3, monitoring the amplitude changes of each tap weight in the adaptive equalization module in real time and recording the position of the tap with the maximum weight; S4, when the offset of the position of the tap with the maximum weight relative to a preset position exceeds a preset threshold, it is determined that the symbol timing has generated cumulative symbol timing drift, triggering the symbol synchronization operation; S5, executing and completing symbol synchronization. Its advantages are: this method reuses an existing adaptive equalizer, using its weight distribution as a direct observation of the synchronization state, significantly reducing FPGA resource consumption.

The invention relates to the technical field of high-speed communication and signal processing, and discloses a self-adaptive equalizer signal compensation method and system for a high-speed serial interface, and the method comprises the steps: obtaining the real-time sampling data of the interface, determining an equalization coefficient through dynamic self-adaptive filtering, and extracting the features of a monitoring signal; calculating environmental interference intensity according to the characteristics, and if the environmental interference intensity exceeds the standard, triggering genetic evolution to obtain optimized parameters; constructing a constraint matrix to correct parameter deviation, generating balance configuration and mapping the balance configuration to a virtual link for stability simulation; if simulation jitter exceeds the standard, historical non-convergent individuals are called for backtracking and re-optimization; real-time error iteration and smoothing processing are carried out based on the environment reference, and a final compensation strategy is determined; and finally, driving a physical link to construct a verification digital eye pattern and counting error codes to obtain communication quality data. The method can solve the problem of low signal compensation precision in the prior art.

An adaptive equalizer includes an updating unit that updates a step size of a vector of a tap coefficient used for controlling an adaptive filter based on a time-series update vector in accordance with a time-series input and output of the adaptive filter that tracks a polarization state of an optical signal received by a coherent optical receiver. The updating unit updates the step size based on a DC gain of the update vector. The updating unit may update the step size for each update vector component based on a DC gain for each update vector component.

The invention relates to a double-loop adaptive equalizer and method suitable for a wide data rate range, and the equalizer comprises an equalization circuit unit, a level control unit, an energy extraction unit, an energy comparison unit, an AEC voltage buffer unit, an AEC voltage threshold judgment unit, an AEC integrating capacitor, and double loops. The double loops comprise a five-stage equalizer loop and a three-stage equalizer loop. An input signal is connected to the equalization circuit unit, the output end of the equalization circuit unit is connected with the input ends of the level control unit and the energy extraction units, the output end of the level control unit is connected with the input ends of the energy extraction units, and the output ends of the two energy extraction units are connected with the input end of the energy comparison unit. The output end of the energy comparison unit is connected with the input end of the AEC integrating capacitor and the input end of the AEC voltage buffer unit, and the output end of the AEC voltage buffer unit is connected with the input end of the AEC voltage threshold judgment unit and the control end of the equalization circuit unit. The output end of the AEC voltage threshold judgment unit is connected with the enabling end of the five-stage equalizer loop and the enabling end of the three-stage equalizer loop. According to the invention, the attenuation signal is adaptively improved and compensated, so that the balanced output signal and the balanced input signal tend to be the same, and correct communication is realized.

In part, the disclosure relates to a method of equalizer performance monitoring. The method includes receiving a signal at a receiver; adjusting step size of an adaptive equalizer in response to changes in state of polarization (SOP) of the received signal, wherein adaptive equalizer is in communication with one or more digital signal processing DSP components, wherein the one or more DSP components are in communication with the receiver; and increasing or decreasing step size of adaptive equalizer in response to updates to one or more filter coefficients.

An adaptive equalizer circuit and an operation method thereof are provided. The adaptive equalizer circuit includes an amplifier circuit and an adaptive circuit. The amplifier circuit is coupled to the adaptive circuit. The amplifier circuit receives an input signal. The amplifier circuit provides a compensation signal to the adaptive circuit based on the input signal. The adaptive circuit provides a compensation setting value and a feedback signal to the amplifier circuit based on the compensation signal. A low-frequency response and a high-frequency gain of the amplifier circuit are adjusted based on the compensation setting value and the feedback signal respectively.

The present application discloses an adaptive equalizer, an electronic device, and a data processing method, which are used to improve the working efficiency of the adaptive equalizer, enhance the performance of the adaptive equalizer, reduce the circuit structure area, and save space resources. The adaptive equalizer includes: a pipeline equalization module, an error calculation module, and a parameter update module; wherein the pipeline equalization module includes a cascaded multi-order equalizer for receiving input data of a channel and calculating the equalization result of the input data; the error calculation module is used to determine and output the output data of the adaptive equalizer based on the equalization result output by the pipeline equalization module, and calculate the error between the equalization result and the preset ideal expected data; the parameter update module is used to update the parameters of the pipeline equalization module based on the error output by the error calculation module.

This invention provides an optimization method and apparatus for an adaptive equalizer in a coherent optical communication system. The method includes: when updating the tap coefficients of the signal equalizer, acquiring the current input signal and the current output signal of the signal equalizer, and determining the data loss function for each tap point based on the error term corresponding to the current output signal, the current input signal, and the current output signal; determining the updated weights of each tap point according to the current weights of each tap point, the data loss function, and the weight sparsification function, so as to optimize the adaptive equalizer; wherein the weight sparsification function for each tap point is determined by setting an L1 regularization parameter and the current weights of each tap point. This invention can reduce the computational complexity of the adaptive equalizer while maintaining its performance.