97 results about "Data demodulation" patented technology

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

The invention discloses a parallel receiving method and system for high-speed 16 QAM (Quadrature Amplitude Modulation) data demodulation, and the method comprises the following steps: S1, carrying out the sampling of received intermediate-frequency 16 QAM data through a high-speed ADC (Analog to Digital Converter), and obtaining four paths of signals through the serial-to-parallel conversion function of the ADC; s2, converting the four paths of signals into 32 paths of parallel signals at a conversion rate of 1: 8 by using a serial-to-parallel converter special for the FPGA; and S3, carrying out digital orthogonal down-conversion on the 32 paths of parallel signals to obtain 16 paths of baseband signals of an I path and a Q path, and then sequentially carrying out matched filtering, timing synchronization, blind equalization, carrier synchronization, frame synchronization and 16QAM judgment decoding to complete parallel receiving. According to the invention, the requirement of high bit rate is met based on three key technologies of timing synchronization, blind equalization and carrier synchronization, and the receiving and demodulation recovery functions of high-speed data in a 16 QAM modulation mode can be effectively completed.

The embodiment of the invention provides a signal demodulation method and device, a satellite communication ground receiver and a storage medium, and relates to the field of satellite communication. According to the method, accurate timing capture is realized by performing coarse synchronization on an original received signal, and then the problem of carrier lock loss caused by large-amplitude Doppler frequency shift caused by high-speed motion and the change rate of the large-amplitude Doppler frequency shift is effectively solved by adopting a mode of combining frequency offset correction and dynamic frequency offset compensation; furthermore, a full-field phase compensation sequence is constructed, point-by-point phase correction is implemented, and phase deviation changing along with time is accurately recovered by utilizing an unwrapping and interpolation technology, so that interference of phase ambiguity on demodulation is avoided; and finally, symbol judgment and data demodulation are carried out on the basis of completing frequency and phase double fine correction, so that the error rate is greatly reduced, the robustness and reliability of a satellite communication system under an extreme channel condition are enhanced, and stable and efficient signal recovery under a large-frequency-offset, high-dynamic and low-signal-to-noise-ratio scene is realized.

The invention discloses a chirp interval modulation backscatter communication method and a chirp interval modulation backscatter communication system based on variable-length scrambling codes, which mainly solve the problems of high power consumption of backscatter labels and high system deployment cost in the prior art. According to the scheme, a sending end sends an environment LoRa signal; the backscattering label modulates information to be sent to an environment LoRa signal in a time interval modulation mode, and modulates a variable-length scrambling code to an anchor symbol; a receiving end performs frequency shift compensation on the backscattering signal by adopting a frequency shift compensation method, demodulates the backscattering signal by combining a sliding window with a variable-length scrambling code, intercepts a backscattering signal sample through the sliding window, and performs de-spreading and fast Fourier transform (FFT) on the signal in the window; the position of an anchor symbol is determined by detecting the maximum value of an FFT peak value, information sent by the backscattering label is recovered from the position of the anchor symbol, and data demodulation is completed. On the premise of keeping demodulation reliability, the power consumption of the tag is effectively reduced, the deployment cost of a backscatter communication system is reduced, and the method can be used for ultra-low power consumption Internet of Things communication.

The invention provides a communication method and a communication device. The method comprises the following steps: acquiring the length of a first orthogonal cover code (OCC) sequence and the index of the first OCC sequence; determining at least one first subcarrier according to the length of the first OCC sequence and the index of the first OCC sequence; sending first data on a first time unit through the at least one first subcarrier, wherein the first data is obtained by performing OCC coding on second data according to the first OCC sequence; and sending a demodulation reference signal (DMRS) sequence on a second time unit through at least one second subcarrier, the at least one second subcarrier belonging to the at least one first subcarrier, and the DMRS sequence being used for demodulating the first data. According to the method, the accuracy of channel estimation can be improved, and the demodulation performance of data is improved.

The invention discloses a programmable electrical nerve stimulation system based on ultrasonic energy supply. The programmable electrical nerve stimulation system comprises an ultrasonic transmitter, a piezoelectric receiver, a rectifier, a power management module, a data demodulation circuit, a control module, an H-bridge driving circuit, a current digital-to-analog converter and an H-bridge circuit, the external ultrasonic transmitter can transmit ultrasonic waves to supply power to the system and transmit data, and the piezoelectric receiver receives ultrasonic signals and converts the ultrasonic signals into alternating current signals. The rectifier and the power management module can convert alternating current signals into direct current signals to provide power for other circuits of the system, the data demodulation circuit processes the alternating current signals to recover data information in ultrasonic waves, the control module controls the H-bridge driving circuit and the current digital-to-analog converter according to the data information, and finally electrical stimulation is achieved through the H-bridge. The system provided by the invention has the characteristics of wireless energy supply, high safety and programmable stimulation parameters, and can realize accurate control of output current parameters.

The invention discloses a multi-fiber dynamic energy supply power transmission line intelligent monitoring system and method, and belongs to the technical field of optical fiber energy supply and sensing, and the system comprises a local control terminal which is used for supplying energy to a plurality of monitoring terminals and receiving multi-mode monitoring data transmitted back by the monitoring terminals, the local control terminal is provided with a laser energy supply module, a data demodulation module and an optical energy dynamic balance control module; the monitoring terminal is used for collecting lead operation state parameters and image information and transmitting the lead operation state parameters and the image information back to the local control terminal through a signal optical fiber; and the multi-core power optical fiber is used for connecting the local control terminal and the plurality of monitoring terminals, and the multi-core power optical fiber comprises a plurality of energy optical fibers which are connected in parallel and a signal optical fiber and supports physical isolation transmission of laser energy supply and multi-wavelength communication. Physical isolation transmission of laser energy supply and multi-wavelength communication is achieved, the energy coupling efficiency is improved, meanwhile, crosstalk between optical fiber channels is effectively reduced, and stable data return is guaranteed.

The invention discloses a distributed intelligent monitoring system and method based on optical fiber communication, and particularly relates to the technical field of optical fiber communication. Brillouin optical time domain analysis is combined with an adaptive laser power regulation and control algorithm, the detection optical power is dynamically adjusted according to the nonlinear characteristic of an optical fiber, nondestructive Kalman filtering is combined with a dynamic Bayesian network, real-time state estimation is carried out on collected data, time sequence analysis is carried out based on a UKF predicted value, and the detection optical power is obtained. An improved signal deconvolution algorithm is introduced in a BOTDA demodulation process to effectively separate SBS-induced false signals, and signal processing is adaptively optimized through a dynamic noise weight adjustment model, so that the accuracy of data demodulation is improved, and the accuracy of SBS-induced false signals is improved. Through fusion of optical signal regulation and control, intelligent data processing and an automatic early warning mechanism, the stability, precision and predictive capacity of the optical fiber monitoring system in a complex environment are improved, and the optical fiber monitoring system is suitable for safety monitoring of key infrastructures.

The invention discloses a chirp delay modulation backscatter communication method and a chirp delay modulation backscatter communication system combined with pseudorandom sequence detection, and mainly solves the problems of low data transmission rate, poor demodulation reliability in a low signal-to-noise ratio environment and high backscatter label complexity in the prior art. According to the scheme, a sending end periodically sends an upper sweep frequency signal as an excitation signal; the backscattering label determines delay time according to a to-be-sent data value, completes one-time modulation in two continuous excitation signal periods, and modulates a pseudo-random sequence into a backscattering signal; and a receiving end demodulates the backscattering signal by adopting a sliding window in combination with a pseudo-random sequence, intercepts the backscattering signal through the sliding window, and performs de-spreading processing and fast Fourier transform on the signal in each window to determine a symbol position so as to realize data demodulation. According to the method, multiple pieces of bit information can be transmitted in one symbol period, the data transmission rate and demodulation reliability are improved, the complexity of the backscattering tag is reduced, and the method can be used for low-power-consumption data transmission of the Internet of Things equipment.

This application discloses a communication method and apparatus, applied in the field of communication technology. The method includes: generating a first signal, wherein a first time slot of the first signal is used to carry a first SSB, a first reference signal, and a second reference signal, the first and second reference signals being correlated with data demodulation, the first reference signal having a QCL relationship with the first SSB, and the second reference signal not having a QCL relationship with the first SSB; and transmitting the first signal. Using this application can reduce the waste of time and frequency resources and improve the utilization rate of time and frequency resources.

The present application relates to the technical field of hard disk monitoring. Disclosed are a data demodulation method and apparatus for a hard disk log, a data modulation method and apparatus for a hard disk log, and a device and a medium. The demodulation method is applied to a baseboard management controller, and comprises: receiving level signals transmitted by state indication pins of a hard disk device, wherein the level signals are signals obtained by the hard disk device performing modulation on the basis of a hard disk log, and original state output signals of the state indication pins; identifying demodulated data corresponding to each target rectangular-wave signal among the level signals; and on the basis of the demodulated data, determining a valid data packet. In the present application, out-of-band monitoring of a hard disk device is realized by means of state indication pins of the hard disk device directly outputting hard disk log data to a baseboard management controller, and thus the problem in a conventional hard disk out-of-band monitoring scheme of it being difficult to realize out-of-band monitoring of a hard disk due to an out-of-band management system not having permission to access hard disk data is solved, thereby expanding the range of hard disk devices that can be subjected to out-of-band monitoring by a baseboard management controller.

The invention discloses a high-robustness pulse position modulation signal receiver, and the receiver comprises a clock data recovery circuit which receives a PPM signal, carries out the continuous frequency division processing, and generates two clock signals CLKB and CLKJZ; the PPM decoding circuit is used for outputting demodulation data and feedback signals; the self-calibration current feedback circuit is used for receiving clock signals CLKB and CLKJZ and a feedback signal, selecting one of the CLKB and the CLKJZ to be output to the PPM decoding circuit based on judgment on the feedback signal, and outputting a control word ICTRL to the current digital-to-analog converter; and the current digital-to-analog converter is used for inputting a reference current IBG and the control word ICTRL from a band-gap reference and outputting a current ICP to the PPM decoding circuit. The decoding circuit has the advantages of being simple in structure, low in power consumption, high in robustness and the like, and data demodulation of PPM signals can be achieved more reliably.

The present application disclosure a method A method and device for controlling a compass bird. The method includes: a main control single-chip microcomputer entering a first deep sleep mode when not processing a task; the main control single-chip microcomputer switching from the first deep sleep mode to a first working mode after receiving an external interrupt signal; a peak detection circuit detecting whether there is a communication carrier signal; a data demodulation unit not starting if the peak detection circuit detects that there is no communication carrier signal; and the data demodulation unit starting to demodulate the communication carrier signal if the peak detection circuit detects that there is the communication carrier signal, and a communication demodulation module sending a demodulated signal to the main control single-chip microcomputer.

Provided in the present application are a communication method and a communication apparatus. The method comprises: a first communication apparatus receiving scheduling information, wherein the scheduling information comprises Z pieces of first information, the Z pieces of first information comprising first information associated with the first communication apparatus, each of the Z pieces of first information being associated with at least one communication apparatus, and Z being an integer greater than 1; and sending data on the basis of precoding information, the precoding information being determined on the basis of the first information associated with the first communication apparatus; or receiving data on the basis of demodulation information, the demodulation information being determined on the basis of the first information associated with the first communication apparatus. In this way, there is no need to send, along with data, DMRSs used to assist in receiving the data, thereby reducing resource overheads caused by sending DMRSs used for demodulating data of various communication apparatuses, and reducing delay caused by processing the DMRSs.

The application discloses a kind of underground space optical cable high fidelity sound restoration method based on DAS system, comprising: the real-time signal collected to optical cable is carried out data demodulation, identify whether it contains energy impact signal generated by the optical cable after being padded and being hit, if it contains, the energy abnormal distribution position in energy impact signal is positioned, obtains positioning point;Continuous analysis time domain signal of positioning point, after filtering low-frequency interference signal, phase anomaly signal is rejected;The sound signals of a plurality of equivalent sensing nodes adjacent to the positioning point are superimposed and averaged to suppress additive noise, and then the sound signal is restored.The application can realize rapid positioning according to the spatial distribution mapping relationship of optical cable, and after filtering background noise from the collected signal, the highly correlated signals of multiple spatial sensing nodes near the positioning position are linearly superimposed to suppress additive random noise, and high-fidelity sound signal restoration is realized.

The application provides a carrier frequency synchronization method applied to a frequency hopping data transmission system, the frequency hopping data transmission system comprising a transmitting end and a receiving end, and the method comprises the following steps: the transmitting end processes to-be-sent data into a data frame, adds a pilot head based on a ZC sequence to the data frame to form a frequency hopping data transmission frame, and sends a radio frequency signal carrying the frequency hopping data transmission frame to the receiving end; the receiving end acquires the radio frequency signal, processes the radio frequency signal into a digital signal; carrier synchronization processing is performed on the digital signal, carrier frequency scanning is performed on multiple frequency hopping points to screen effective communication frequency points; the starting position of the data frame is determined according to the effective communication frequency points, data demodulation and decoding are performed on the data frame, and original data is recovered. Through the application, the excellent autocorrelation characteristics of the ZC sequence and the intelligent double-peak detection mechanism are utilized to realize carrier frequency synchronization without strict time synchronization, and fast and anti-interference data transmission is completed.

The present application provides a communication method and apparatus. The method comprises: a terminal device sends a first symbol group at a first frequency position, and then, the terminal device sends a second symbol group at a second frequency position, wherein the first frequency position is different from the second frequency position, the first symbol group and the second symbol group are included in a plurality of symbol groups, the plurality of symbol groups are determined on the basis of first data of the terminal device and a first sequence corresponding to the terminal device, and the first sequence is contained in a modulation sequence set. By performing frequency hopping transmission of symbol groups at different frequency positions using symbol groups as units, a better frequency diversity gain can be obtained, helping to improve the robustness of the data demodulation performance, such that performance loss caused by a plurality of symbol groups simultaneously undergoing deep channel fading can be avoided or reduced, and the coverage can be improved.

The present application provides a communication method, apparatus and system. In the method, a terminal device first transmits a first reference signal for channel sounding, and then transmits uplink data and a second reference signal which is used for uplink data demodulation, wherein the first reference signal and the second reference signal use an identical sequence. By matching statistical properties of the sequences of the first reference signal and the second reference signal, such as the autocorrelation and cross-correlation properties of the sequences, channel measurement results and interference measurement results based on the first reference signal and the second reference signal are matched with each other. Consequently, parameters or processing related to uplink data scheduling determined on the basis of the first reference signal is better adapted to an actual channel and an actual interference experienced during uplink data transmission, thereby improving uplink transmission performance.

The present invention discloses a precoding transmission method and device based on a RIS-assisted vehicle networking communication system. The method includes the following steps: constructing an orthogonal LFM waveform based on the channel characteristics of the RIS-assisted vehicle networking communication system and the multi-user transmission requirements; obtaining a precoded RIS-assisted vehicle networking communication system cascade channel matrix based on a preset precoding matrix; converting the precoded RIS-assisted vehicle networking communication system into a real-domain precoding linear model; setting the precoding equivalent channel matrix of the real-domain precoding linear model to a unit matrix to obtain a precoding matrix of the vehicle networking communication system; estimating the real-domain precoding equivalent channel of the real-domain precoding linear model based on a linear channel estimation algorithm; and performing data demodulation on the transmitted information based on a multi-antenna combined minimum Euclidean distance algorithm to complete information transmission. The present invention can reduce channel estimation overhead, improve the high reliability of information transmission, and enhance the anti-interference capability between multiple users.

The present disclosure provides a method for testing the signal vector error magnitude (EVM) of a multi-channel antenna device, comprising obtaining a test data source comprising multiple streams through preset orthogonal coding; dividing the test data source into multiple channels of the multi-channel antenna device for transmission; wherein the data transmitted by each channel comprises a portion of data from each stream, and the data transmitted by all channels comprises all data from all streams; receiving a composite signal; wherein the preset orthogonal coding enables the composite signal to satisfy the following conditions: after demodulation, the composite signal only obtains data from a specified stream in the test data source; and demodulating the composite signal based on the data from the specified stream to determine the signal vector error magnitude (EVM) of the multi-channel antenna device. The present disclosure also provides a device and medium for testing the EVM of signals of a multi-channel antenna device.

A signal processing circuit includes a channel estimation device, a data processing circuit and a false path detection circuit. The channel estimation device estimates transmission paths of a received signal based on a preamble portion of the received signal to generate channel parameter information. The data processing circuit processes a data portion of the received signal according to the channel parameter information to generate a data demodulation result associated with each transmission path. The false path detection circuit determines a characteristic value based on the data demodulation result associated with each transmission path, determines whether corresponding transmission path is a false path according to the characteristic value and the channel parameter information, and updates the channel parameter information to generate updated channel parameter information in response to the corresponding transmission path being determined as a false path. The updated channel parameter information does not comprise information regarding the false path.

Disclosed in the present application are a communication method and a communication apparatus. The present application is applicable to communication scenarios that support simultaneous data and power transfer. The method comprises: receiving a third signal, the third signal comprising a first OFDM symbol and a second OFDM symbol, the first OFDM symbol and the second OFDM symbol occupying a same time-frequency resource, the first OFDM symbol carrying a first modulation symbol block, and the second OFDM symbol carrying a second modulation symbol block, wherein the intersection of a set of subcarriers corresponding to modulation symbols in the first modulation symbol block and a set of subcarriers corresponding to modulation symbols in the second modulation symbol block is an empty set; performing power charging by using the third signal; and, on the basis of the third signal, obtaining a bit sequence. The present application can provide support for ensuring both the power charging efficiency and data demodulation performance while implementing simultaneous wireless power transfer and data transfer.

The present application provides a communication method and a communication apparatus. The method comprises: receiving first indication information, the first indication information indicating a first port and a second port; receiving first data of the first port, the first data being obtained by precoding on the basis of a first precoding matrix, and the first precoding matrix being determined on the basis of a first multipath parameter of the first port; and demodulating the first data on the basis of the first precoding matrix and a second precoding matrix, the second precoding matrix being determined on the basis of a second multipath parameter of the second port. The first port and the second port can be determined by means of the first indication information. Therefore, when demodulating the received data, precoded by means of the first precoding matrix, of the first port, a multipath parameter of the second port can be used for interference processing, thereby improving the performance of data demodulation.

Provided in the present application are a communication method and a communication apparatus. The method comprises: acquiring the length of a first orthogonal cover code (OCC) sequence and an index of the first OCC sequence; on the basis of the length of the first OCC sequence and the index of the first OCC sequence, determining at least one first subcarrier; sending first data on a first time unit by means of the at least one first subcarrier, wherein the first data is obtained by performing OCC coding on second data on the basis of the first OCC sequence; and sending a demodulation reference signal (DMRS) sequence on a second time unit by means of at least one second subcarrier, wherein the at least one second subcarrier belongs to the at least one first subcarrier, and the DMRS sequence is used for demodulating the first data. The method can improve the accuracy of channel estimation and improve the data demodulation performance.

The present invention provides a spectral domain reflectometer system and an implementation method, comprising: a light source module generates a local optical signal and a detection optical signal with a comb spectrum, the local optical signal is directly connected to a coherent detection module, a portion of the detection optical signal enters an optical fiber to be tested after passing through a passive optical path module, a backscattered signal returned from the optical fiber to be tested enters the coherent detection module through the passive optical path module, beats with the local light and outputs a sensing electrical signal; the other portion directly enters the coherent detection module, beats with the local light and outputs a reference electrical signal; both the sensing electrical signal and the reference electrical signal are input into a signal processing module for data demodulation, and an intensity and phase distribution signal of the backscattered signal on the optical fiber link is obtained.

The invention discloses an uplink sensing iterative optimization method based on a cellular-free system, which is used for solving the problems that the sensing precision depends on the communication demodulation quality and the communication performance is limited by the sensing result in an ISAC system, and is suitable for future 6G scenes of large-scale terminal connection and high-precision sensing cooperation. The method comprises the following steps: constructing a multi-signal collaborative sensing module, fusing pilot frequency initial sensing and data signal enhanced sensing, and extracting target parameters; constructing a dynamic channel reconstruction module, and mapping a sensing result into channel state information required by communication; and constructing a robust data demodulation module, recovering communication data by using channel information, and feeding back a demodulation error to correct a sensing result. The above modules form a closed-loop feedback mechanism, and the sensing precision and the communication reliability are gradually improved in the iteration process. Compared with the prior art, the method can effectively reduce the bit error rate and improve the sensing positioning precision, has the advantages of low cost, high accuracy and the like, and has wide practical application value and engineering popularization prospect.

The embodiment of the invention relates to a model training method and device, a model reasoning method and device, a node, a system and a medium. The model training method can be executed by a first node, and the method comprises the following steps: obtaining multiple groups of sample data obtained based on different modulation modes; each group of sample data comprises first to-be-demodulated data and first demodulation data, the first demodulation data corresponds to the first to-be-demodulated data, and the data lengths of the first demodulation data in different groups of sample data are the same; and training a first model based on the first to-be-demodulated data and the first demodulation data, the first model being used for data demodulation. Therefore, in the embodiment of the invention, the difference of different modulation modes can be ignored, so that corresponding demodulation models do not need to be trained for different modulation modes, and the training overhead and the storage overhead of the demodulation models are reduced.

This invention provides a method, apparatus, base station, and communication system for interference cancellation in private network communication. Based on this interference cancellation method, after the target base station enters the working state, it receives uplink data sent by terminals in the same cell. During the demodulation of the uplink data, an interference cancellation matrix is ​​multiplied by the uplink data to obtain the interference-free uplink data. This interference cancellation matrix is ​​calculated using any idle resource block to evaluate the interference signals from adjacent base stations. In this embodiment, the target base station calculates the interference cancellation matrix of adjacent base stations using idle resource blocks, and then uses the interference cancellation matrix to cancel the interference signals, achieving the goal of quickly and effectively suppressing co-channel interference from adjacent base stations. This further improves the uplink data demodulation capability of the target base station.

Provided in the embodiments of the present application are a communication method and a related apparatus. The communication method comprises: a network-side device sending a demodulation reference signal to a user equipment, wherein the demodulation reference signal is generated on the basis of first sequences, the first sequences are periodic sequences, the period of each of the first sequences is 2p-1, p being an integer greater than 1 and less than 31, and the demodulation reference signal is used for downlink data demodulation. By reducing the period of each first sequence, a length of the first sequence that is truncated when the first sequence is used is reduced, and by reducing the length of the first sequence that is truncated when the first sequence is used, a cross-correlation value between first sequences is reduced, thereby improving cross-correlation performance of the demodulation reference signal and further reducing inter-cell interference.

The application discloses a multi-terminal concurrent communication network on-demand fast authorization and multi-domain priori balancing method, belongs to the technical field of communication networks, and particularly relates to a concurrent communication method for realizing single handshake, i.e., completing on-demand fast authorization of resources, by using multi-domain priori probability information in a multi-terminal concurrent communication scene, which can be applied to optical communication bus networks, industrial internet wireless multiple access, wired / wireless time fusion sensitive networks and the like. The method analyzes the structures of different domains in a communication mechanism, fully utilizes the priori sparse characteristics of different domains, and accumulates multi-channel observation and transmission resource observation through a frame structure of multi-channel observation-transmission resource joint expansion. Therefore, the activity detection of concurrent terminals, channel estimation and data demodulation can be efficiently realized under a limited number of hardware array type acquisition units, i.e., an efficient on-demand fast authorization concurrent access is realized in a multi-terminal concurrent communication network.