63 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 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 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.

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.

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.

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.

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.

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.

The application discloses a programmable nerve electric stimulation system based on ultrasonic energy supply, which 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-analog converter and an H-bridge circuit; the external ultrasonic transmitter can emit ultrasonic waves to supply power to the system and transmit data, and the piezoelectric receiver receives the ultrasonic signals and converts them into alternating current signals; the rectifier and the power management module can convert the alternating current signals into direct current signals to provide power supply for the rest of the circuit of the system, the data demodulation circuit processes the alternating current signals to recover the data information in the ultrasonic waves, the control module controls the H-bridge driving circuit and the current digital-analog converter according to the data information, and finally realizes electric stimulation through the H-bridge.The system has the characteristics of wireless energy supply, high safety and programmable stimulation parameters, and can realize precise control of the output current parameters.

This invention discloses a three-dimensional visualization device and method for real-time temperature monitoring of landslide bodies, including a distributed fiber optic temperature measurement module, a monitoring system, and a power supply device. The temperature measurement module consists of a temperature-sensing optical cable with an array of weak grating temperature sensors inscribed on it, which is deployed in a borehole drilled according to a three-dimensional geological model and connected to the weak grating demodulator of the monitoring system via a data transmission optical fiber. The monitoring system also includes a data processing unit and a wireless communication module to realize data demodulation, processing, and remote transmission. The power supply device uses a combination of solar energy and batteries. The construction method includes: exploration and modeling, borehole construction, system installation, fiber optic laying, cable lowering, connection testing, borehole backfilling, and operation monitoring. This invention achieves continuous and distributed measurement of the internal temperature of the landslide body along the borehole depth direction, constructing a three-dimensional temperature field through multi-hole deployment, and has the advantages of long-term stability, anti-interference, and high degree of automation.

A communication method and device, the method comprising: adding a reference signal (referred to as a first reference signal) in a message A, the time domain interval between the first reference signal and a second reference signal (DMRS) being less than the time domain interval between the second reference signal (DMRS) and a first random access preamble (preamble), and the first reference signal being transmitted between the first random access preamble (preamble) and the second reference signal (DMRS). The time domain positions of the first reference signal and the second reference signal are closer. The probability of phase jumps of PA and other devices of a transmitter included in a terminal device within the time domain interval between the first reference signal and the second reference signal is lower, the probability of phase continuity of the first reference signal and the second reference signal is higher, thereby improving the probability of successful uplink data demodulation and improving the demodulation performance of the PUSCH.

The invention belongs to the technical field of fiber bragg grating sensing, and discloses a distributed fiber bragg grating multi-parameter sensor, a preparation method and a data demodulation method. The preparation method comprises the steps that different fiber bragg gratings are inscribed in different optical fibers, coating layers of which are not removed, so that a plurality of fiber bragg gratings are obtained, and the distributed fiber bragg grating multi-parameter sensor is prepared through the plurality of fiber bragg gratings; the data demodulation method comprises the following steps: inputting a real-time reflection spectrum into a trained optimization algorithm-machine learning model for demodulation to obtain a strain parameter or / and a humidity parameter or / and a temperature parameter; according to the invention, the problem that the humidity sensing accuracy is affected due to uneven distribution of a coating layer caused by coating a humidity-sensitive material on the surface of the quartz fiber grating without the coating layer in the prior art can be avoided; and then the signal is converted into a measured physical quantity, so that the demodulation frequency of the sensor is limited.

The invention provides a scheduling information indication method and device, and relates to the field of communication. The method comprises the steps that a first network device in a plurality of network devices sends first information to a terminal device, the first information is scheduling information jointly determined by the plurality of network devices, and each network device in the plurality of network devices sends second information to the terminal device, the second information is information different from the first information in the scheduling information determined by each network device, the first information and the second information jointly indicate one scheduling information, and the terminal device can determine the scheduling information of each network device based on the first information and the second information. In this way, data demodulation can be carried out on the data streams sent by the network devices based on the scheduling information of the network devices, and the probability of data demodulation can be improved.

A modulation and demodulation method, apparatus, and system are disclosed, characterized in that the method comprises the following steps: Step 1, generating a quantum step wave based on a stepped AC quantum voltage and an original carrier wave; Step 2, performing equal-interval sampling and flat-interval sampling on the quantum step wave to obtain the step distance error and flat-interval error existing between the step wave and the original carrier wave; Step 3, setting the transmission window width based on the correlation between the step distance error and the flat-interval error, and performing modulation and demodulation of the original signal based on the transmission window width. This invention has a clear concept and a simple method. By eliminating transient process data, it improves the accuracy of data demodulation and recovery processes, reducing noise while ensuring transmission efficiency.

The invention provides a modulation mode determination method, receiving end equipment, a system and a storage medium, and the method comprises the steps: receiving first data; and determining a modulation mode of the first data. According to the data demodulation method and device, the receiving end device can determine the modulation mode of the received first data by itself, the occupation of signaling resources is reduced, the reliability of data demodulation is improved, and the availability is high.

The present application relates to the field of communications, and provides a communication method and a communication apparatus. The method comprises: acquiring first information, the first information comprising first reference position information and at least one first distance threshold; determining configuration information of a phase tracking reference signal (PTRS) on the basis of the first reference position information and the at least one first distance threshold; sending a physical uplink shared channel (PUSCH) on the basis of the configuration information of the PTRS; or receiving a physical downlink shared channel (PDSCH) on the basis of the configuration information of the PTRS. By introducing the first reference position information and the at least one distance threshold, the embodiments of the present application provide support for configuring a PTRS on the basis of the coverage area of a network device. Specifically, the embodiments of the present application allow for configuration of high-density PTRS pilots in high frequency offset scenarios, thereby improving data demodulation performance; and in addition, the embodiments of the present application allow for configuration of low-density PTRS pilots in low frequency offset scenarios, thereby reducing pilot overhead.

This invention relates to a generalized code division multiplexing (GDM) modulation and demodulation method. GDM modulation is based on the superposition of codewords in a non-orthogonal codeword set through high-order modulation. The demodulation method fully utilizes the characteristics of GDM modulation, employing IFFT-FFT to achieve fast codeword detection, thereby reducing demodulation complexity. Simultaneously, frequency response estimation of the transmission channel can be achieved through a simple spectrum division method in the pilot channel, thereby achieving channel equalization and improving anti-multipath demodulation performance. Furthermore, by constructing an interference cancellation matrix within the data channel, mutual interference caused by the non-orthogonality of codewords within the data channel can be eliminated, thus enabling data demodulation even under non-orthogonal codeword conditions.

The present application relates to the technical field of radio frequency fingerprint extraction and identification, and particularly relates to a 5G radio frequency fingerprint extraction and identification method for a multi-user access scene, comprising the following steps: S1: using multiple 5G devices to simulate a multi-user access scene to send uplink data frames and collect over-the-air signals; S2: after the over-the-air signals are sequentially preprocessed by signal blind synchronization, resource grid resolution and data demodulation, resource blocks and corresponding resource block features are obtained; S3: using the over-the-air signals and the resource block features, a device-channel feature extractor for intra-frame device resource block clustering is trained by using hyperspherical metric learning; S4: using the over-the-air signals and the resource block features, a single-resource block device classifier is trained; and S5: based on the trained device-channel feature extractor and the single-resource block device classifier, a resource block cluster level device identification system in a multi-user scene is constructed, and a device identification result corresponding to the over-the-air signals is output by a voting mechanism.

This invention discloses an on-demand rapid authorization and multi-domain prior equalization method for multi-terminal concurrent communication networks, belonging to the field of communication network technology. Specifically, it relates to a concurrent communication method that utilizes multi-domain prior probability information to achieve a single handshake, i.e., complete on-demand rapid resource authorization, in multi-terminal concurrent communication scenarios. This method can be applied to systems such as optical communication bus networks, industrial internet wireless multiple access, and wired / wireless time-sensitive networks. The method analyzes the structure of different domains in the communication mechanism, fully utilizes the prior sparsity characteristics of different domains, and accumulates multi-channel observations and transmission resource observations through a frame structure jointly extended by multi-channel observation and transmission resources. Thus, with a limited number of hardware array acquisition units, it can efficiently realize concurrent terminal activity detection, channel estimation, and data demodulation, i.e., achieve efficient on-demand rapid authorization concurrent access in multi-terminal concurrent communication networks.

The invention relates to a digital regeneration-based static orbit satellite broadcast forwarding system, which is characterized in that a demodulation receiver receives uplink data of a ground station through a receiving antenna, completes data demodulation and transmits the data to a rear-end data processor; the data processor judges whether the uplink data needs to be fused with the real-time remote sensing data or not according to the identifier of the uplink data, and if the uplink data is the data needing to be fused, fusion processing of the uplink data and the remote sensing data is completed in the data processor; if the uplink data does not need to be fused, directly storing the uplink data into the solid-state memory; reading broadcast distribution data from the solid-state memory, and forwarding the broadcast distribution data to the broadcast modulator through the data processor; the broadcast modulator encodes and modulates broadcast downlink data into a radio frequency signal, and the radio frequency signal is broadcast and distributed to a designated area through the transmitting antenna after being subjected to filtering and power amplification. And the use efficiency of broadcast distribution of the geostationary orbit remote sensing satellite is effectively expanded.

Provided are a rate matching method and a communication device, the method in which a network device binds different rate matching mechanisms for a terminal device for different frequency domain resources, the rate matching information being used for indicating positions of time-frequency resources not used for data transmission in the corresponding frequency domain resources, and the rate matching information being used for indicating positions of time-frequency resources not used for data transmission in the corresponding frequency domain resources. The terminal device can perform rate matching on different frequency domain resources based on different rate matching information. The method can ensure that the terminal equipment can carry out rate matching in a differentiated manner under different bandwidths, and more accurate data demodulation is realized, so that the receiving performance of the terminal equipment is improved.

This application relates to a signal processing method and apparatus, a signal transmission method and apparatus, a communication system, a communication device, a computer-readable storage medium, and a computer program product. The signal processing method includes: determining an estimated value of the incident angle of each communication path based on the received signal acquired from the transmitter by each receiving antenna, and separating multiple single-path signals from the received signal in the angle domain; transforming each single-path signal to the time-delay Doppler domain to obtain a time-delay Doppler domain single-path signal; combining the pilot mode of the transmitted signal transmitted by the transmitter, and based on the estimated value of the time-delay Doppler domain single-path signal of each communication path and the estimated value of the incident angle, determining an estimated value of the channel parameters for each communication path; compensating for each time-delay Doppler domain single-path signal based on the estimated value of the channel parameters for each communication path, and performing data demodulation based on the compensation results.