6599 results about "Demodulation" patented technology

The invention discloses a turbofan engine operation monitoring method and system based on digital twinning, belongs to the technical field of turbofan engine monitoring, and aims to solve the problems that weak fault signals such as early cracks and abrasion are difficult to extract and the prediction precision of a multi-source fault propagation path is low under a strong noise background. An original operation signal is collected through a sensing array, and is processed by an adaptive resonance demodulation chain to generate a demodulation signal. The method comprises the following steps: carrying out time-frequency transformation on a demodulation signal, constructing an initial candidate feature set by combining feature frequency prior matching actual measurement and theoretical feature frequency, and generating an independent feature set by fusing multi-scale decoupling network separation features of digital twin constraints; for independent features, effective causal pairs are screened by adopting a physical coupling relationship combining Granger causal analysis and digital twinborn simulation, a dynamic Bayesian network is constructed to simulate fault propagation, a posterior probability is calculated through digital twinborn verification and Monte Carlo simulation, early warning is triggered, and a maintenance decision is generated. And weak signal extraction and accurate fault prediction under strong noise are realized.

To provide a modulation / demodulation method that can avoid overshoot that occurs during a signal point transition process on a constellation even when the Y-00 encryption communication method is applied to a modulation method used in wireless communication, and a wireless communication device using the method.SOLUTION: A modulation method using the Y-00 encryption communication method by phase modulation of information for wireless communication, includes determining a reference position in a constellation of a previous signal point indicating previously transmitted data, making a certain range determined by the reference position a prohibited area so that a transition path of the signal point avoids passing near the origin on the constellation, determining a relative position of the current signal point from the reference position based on a current running key and currently transmitted data within a range excluding the prohibited area, determining I / Q coordinates on the constellation from the current signal point to generate modulated data, and performing multi-value phase modulation.SELECTED DRAWING: Figure 11

According to some embodiments, a method performed by a wireless device comprises obtaining an indication that a demodulation reference signal (DMRS) is based on frequency domain coding using a frequency domain orthogonal cover code (FD-OCC) of length greater than two and transmitting or receiving a number of DMRS based on the frequency domain coding.

The invention provides a life detection method and system based on radar signal processing, and relates to the technical field of radar signal processing, and the method comprises the steps: collecting a radar echo signal of a target region, controlling a phased array radar transmitting antenna array to transmit an orthogonal frequency division multiplexing dual-frequency continuous wave radar signal, and transmitting the dual-frequency continuous wave radar signal. Inputting the processed radar echo signal into an orthogonal demodulation module for synchronous coherent demodulation to obtain a baseband signal; inputting the feature vector into a multi-task deep learning network integrated with an attention mechanism for feature fusion and target recognition to obtain a second processing signal; obtaining a target characteristic frequency spectrum by calculating the time-frequency distribution of the second processing signal, and judging whether a life body exists in the target area or not according to the time-varying characteristics of the respiratory frequency component and the heartbeat frequency component and the amplitude fluctuation rule; and calculating three-dimensional space coordinates of the life body through a multi-base-station cooperative positioning algorithm, and outputting a detection result containing the three-dimensional space coordinates and the life body feature information.

Techniques pertaining to techniques for physical downlink shared channel (PDSCH) allocation in subband full duplex (SBFD) networks are described. Such techniques pertain to both PDSCH frequency domain resource allocation (FDRA) Type-0 and / or FDRA Type-1 and include the use of fractional resource block groups (RBGs), virtual resource block (VRB)-interleaving, canceling one or more repetitions or SPS transmission in a slot that is an SBFD slot or a non-SBFD slot. The techniques further include VRB-to-physical resource block (PRB) mapping that excludes one or more PRBs in the sequence of PRBs that belong to one or more UL-subband or one or more guard bands and applying one or more rules to provide for the selection of a wideband setting for a precoder resource block (RB) group (PRG) size with respect to use of a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS).

Disclosed are a method and a device for transmitting or receiving an uplink channel on the basis of demodulation reference signal (DMRS) bundling in a wireless communication system. A method by which a terminal transmits an uplink channel in a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving configuration information related to the DMRS bundling for the uplink channel from a network; and transmitting the uplink channel to the network in a first actual time domain window (TDW) within a set TDW or in the first actual TDW and a second actual TDW within the set TDW, wherein the first actual TDW ends in relation to an event, and whether to generate the second actual TDW in response to the event may be based on capabilities of the terminal, on the basis of the event being a first type event.

The invention provides an LNG ship containment system monitoring system and method based on a fiber bragg grating sensor, and belongs to the crossing field of fiber sensing technology and ship safety engineering, the system comprises a fiber bragg grating sensor and a demodulation device, the fiber bragg grating sensor is used for collecting optical signals, and the demodulation device converts the optical signals into electric signals and processes the electric signals. The fiber bragg grating sensor adopts a double-grating structure and is respectively used for stress monitoring and temperature compensation so as to realize omnibearing real-time monitoring. The fiber grating sensor comprises a tail fiber, a protective tube, a base, and a strain grating, a spring and a temperature grating which are located in the protective tube. According to the invention, the monitoring precision and safety of the LNG ship containment system can be improved; through a double-grating temperature compensation technology, the influence of temperature change on stress measurement is eliminated, and the accuracy and reliability of data are ensured; in addition, stress information in different directions can be obtained in real time through the three-dimensional stress monitoring scheme, the stress condition of the structure is comprehensively reflected, and the flexibility and adaptability of monitoring are improved.

The invention relates to the field of heart rate monitoring, and discloses a millimeter wave radar breath and heart rate synchronous monitoring method and system, and the method comprises the steps: transmitting a linear frequency modulation continuous wave signal according to a millimeter wave radar, and collecting original echo data reflected by a target region; baseband signal demodulation and phase information extraction are carried out on the original echo data to obtain original phase time sequence data, and the original phase time sequence data comprise thoracic cavity micro-motion features; and according to a Butterworth band-pass filter, preprocessing the original phase time sequence data through human body physiological signal frequency band characteristics to obtain a breathing frequency band signal and a heart rate frequency band signal. According to the method, the apnea event triggering threshold value and the arrhythmia early warning index are updated in real time through Kalman filtering and extended Kalman filtering, so that the monitoring system can dynamically adjust the health parameters, which means that the monitoring system can be optimized in real time and the abnormal health event can be accurately responded in different physiological states.

The present disclosure provides systems and methods for mapping transmission configuration indication (TCI) states to demodulation reference signal (DMRS) ports groups in a wireless network. For instance, a TCI state to DMRS ports group mapping of a user equipment (UE) can be determined. Each DMRS port in a DMRS ports group shares a quasi-co-location (QCL) assumption. The TCI state to DMRS ports group mapping comprises multiple TCI state groups. The TCI state to DMRS ports group mapping corresponds each TCI state group to one or more DMRS ports groups. A TCI state group from the DMRS ports group mapping can be selected for the UE. Data indicative of the selected TCI state group and the corresponding one or more DMRS ports groups can be provided to the UE based at least in part on the TCI state group from the DMRS ports group mapping.

The invention discloses a wind turbine generator anti-impact noise fault identification method based on feature embedding deep learning, and the method comprises the steps: carrying out the feature mode decomposition of an original vibration signal of a wind turbine generator, screening out an optimal mode component, and converting a time domain signal of the optimal mode component into an envelope spectrum; using the minimum envelope entropy as a fitness function, and using a sparrow search algorithm to globally optimize the filter length and the decomposition modal number of characteristic modal decomposition; and extracting time-frequency domain features, constructing a multi-dimensional time-frequency domain feature vector, inputting the multi-dimensional time-frequency domain feature vector into the combined fault recognition model, and outputting a fault classification result. According to the method, on the basis of an FMD and SSA-MEE joint optimization framework, the sensitivity limitation of a traditional envelope demodulation method on impact noise is broken through, modal aliasing is restrained, and noise robustness is enhanced. According to the method, the vibration signals are subjected to characteristic mode decomposition, the influence of early impact noise is inhibited, a CNN-GRU-Attention fault recognition model is provided, and the accuracy of fault recognition is greatly improved.

The invention discloses a calibration system in an active channel of a waveguide array phased-array antenna, and relates to the technical field of calibration in the active channel. Comprising a calibration judgment module, a waveguide directional coupling module, an amplitude-phase detection module and a digital domain optimization module, the calibration judgment module realizes intelligent triggering calibration through real-time monitoring of a multi-dimensional environment and performance parameters, and ensures that a calibration process is started only when the system state is deteriorated; the waveguide directional coupling module ensures that the calibration signal is accurately injected into each channel, and realizes cross polarization suppression through a polarization grid filter; the amplitude-phase detection module realizes high-precision measurement of amplitude, phase, group delay and polarization parameters of feedback signals of each channel by using superheterodyne and IQ demodulation technologies; and the digital domain optimization module calculates and updates the complex compensation weight of each channel through real-time digital signal processing and a self-adaptive algorithm, and realizes comprehensive and accurate calibration in combination with temperature-frequency interpolation and nonlinear pre-distortion compensation.

Methods and apparatus of resource mapping for DMRS ports are disclosed. The method includes: receiving, by a receiver, a Demodulation Reference Signal (DMRS) configuration with a plurality of DMRS ports, the plurality of DMRS ports comprising a first port group with a first set of DMRS ports and a second port group with a second set of DMRS ports; determining, by a processor, a DMRS resource comprising a first part of the DMRS resource for the first port group and a second part of the DMRS resource for the second port group; and receiving, by the receiver, a DMRS mapped to the first part and the second part of the DMRS resource.

The invention discloses a signal transmission method and device based on joint index modulation, and belongs to the technical field of communication. Through the joint index modulation rule, accompanying transmission of the secret key of the multi-layer encrypted chaotic system is achieved, the rule has a certain constellation forming effect on a constellation diagram, and by optimizing the dual-mode index rule and the subcarrier index rule, optimized distribution of internal constellation points is achieved, and the transmission performance of signals is improved; in addition, only a legal receiving end can extract a correct key through a joint index rule for decryption and demodulation, and an illegal receiving end cannot realize correct demodulation due to the effect of multi-layer encryption and the loss of the key, so that high-safety and high-performance transmission of the key and the signal is ensured.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a demodulation reference signal (DMRS) configuration that indicates a code-division multiplexing (CDM) group configured for the UE; receive a first indication of an antenna port, included in the CDM group, assigned to the UE for reception of a first set of DMRS transmissions; receive a second indication of whether a second set of DMRS transmissions for another antenna port, included in the CDM group, is present or absent for another UE; and perform channel estimation based at least in part on the first indication of the antenna port and the second indication of whether the second set of DMRS transmissions for the other antenna port is present or absent. Numerous other aspects are provided.

A wireless device receives one or more radio resource control (RRC) messages indicating a handover from a first cell to a second cell and a synchronization signal block (SSB), of the second cell, for receiving a downlink control information (DCI) from the second cell. The wireless device receives, from the second cell and based on a demodulation reference signal (DMRS) antenna port being quasi co-located with the SSB, the DCI scheduling an uplink transmission, wherein the uplink transmission is an initial uplink transmission, to the second cell, after receiving the one or more RRC messages indicating the handover. The wireless device transmits, to the second cell and based on the SSB indicated by the one or more RRC messages, the uplink transmission.

A controller configured to control a sound producing module includes a volume controlling unit configured to determine a demodulation amplitude and a modulation amplitude corresponding to a target volume. The sound producing module comprises a driving circuit and an air-pulse generating device. The driving circuit generates a demodulation driving signal according to the demodulation amplitude and generates a modulation driving signal according to the modulation amplitude, so as to drive the air-pulse generating device. The air-pulse generating device produces sound via generating a plurality of air pulses at an ultrasonic pulse rate.

A method for receiving a DM-RS by a user equipment (UE) in a wireless communication system is disclosed, compises receiving activation information; transmitting feedback information on the activation information; receiving downlink control information (DCI) including i) a transmission configuration indication (TCI) field and ii) an antenna port field; and receiving the DM-RS based on the DCI, wherein the activation information includes information related to mapping of a code point of the TCI field and a TCI state, wherein based on the TCI field indicating a code point mapped with a plurality of TCI states, and the antenna port field indicating antenna ports of a plurality of code division multiplexing (CDM) groups, a first TCI state among the plurality of TCI states corresponds to a CDM group associated with a first antenna port based on an instruction order of the antenna ports.

A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration of a demodulation reference signal (DMRS), and a control section that controls transmission and reception of the DMRS, based on one or more associations between a plurality of code division multiplexing (CDM) groups and a plurality of DMRS ports and the configuration. The number of the plurality of DMRS ports for DMRS configuration type 1 is larger than 8, and the number of the plurality of DMRS ports for DMRS configuration type 2 is larger than 12. The plurality of DMRS ports include a first plurality of DMRS ports and a second plurality of DMRS ports. According to one aspect of the present disclosure, an appropriate number of DMRS ports can be used.

The invention relates to the technical field of data transmission, and discloses an ultrahigh frequency RFID system data transmission method, device and equipment and a storage medium, and the method comprises the steps: carrying out the band-pass filtering and orthogonal demodulation of a multi-tag backscattering signal received by an RFID reader, and obtaining a tag feature data sequence; performing multi-dimensional feature analysis and time sequence correlation calculation to obtain an independent label signal frame; boundary identification is carried out, and a label data frame starting point is determined; carrying out continuous sampling analysis and label signal conflict identification, and outputting a conflict position sequence; performing matrix interleaving transformation and position rearrangement on the data marked by the conflict position sequence to generate an anti-conflict data packet; the label access scheduling queue is constructed based on the transmission time sequence and the priority attribute of the anti-collision data packet, the multi-label concurrent transmission time sequence is output, and the data transmission performance of the ultrahigh-frequency RFID system is improved through multi-stage signal processing and an intelligent scheduling mechanism.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first control signaling indicating a demodulation reference signal (DMRS) port mapping configuration for a set of antenna port field values. For each antenna port field value, the DMRS port mapping configuration may include a first mapping between a first codeword corresponding to a first transmission-reception point (TRP) and a first code-division multiplexing (CDM) group, and a second mapping between a second codeword corresponding to a second TRP and a second CDM group. The UE may receive second control signaling that indicates an antenna port field value from the set of antenna port field values. The UE may then receive, based on the antenna port field value, first and second DMRSs including the first and second codewords, respectively, via first and second sets of DMRS ports corresponding to the first and second CDM groups, respectively.

Systems, methods, and instrumentalities are disclosed herein associated with transmission of demodulation reference signals (DMRS) in wireless systems. DMRS symbols may be placed in a slot for channel estimation operations. For example, channel estimation performance may be enhanced based on using an increased number of DMRS symbols. Channel estimation enhancements may be performed by transmitting DMRS symbols in an extended slot, for example, to avoid data degradation (e.g., which may result from replacing data transmission symbols with DMRS symbols). An extended slot may be a slot that includes symbols spanning across multiple slots (e.g., two slots, consecutive slots), for example, such as a slot n and a slot n+1.

A terminal according to one aspect of the present disclosure includes a receiving section that receives an antenna port indication when at least one of a demodulation reference signal (DMRS) type and a maximum length of the DMRS to be configured is not 1, and a control section that controls uplink (UL) transmission corresponding to two codewords, the UL transmission using a number of layers greater than four, based on the antenna port indication. According to one aspect of the present disclosure, UL transmission with the number of layers greater than four can be appropriately controlled.

The invention discloses a power line carrier communication fault detection system, and relates to the technical field of power line fault detection, the fault detection system comprises a data acquisition module, an abnormity analysis module, a fault diagnosis positioning module, a fault grading evaluation module, a response measure matching module and an alarm module, and the modules are in electric signal connection. According to the invention, the signal change on the power line is rapidly captured by monitoring the modulation signal after carrier demodulation on the power line, including the sending performance index and the electrical performance index, and the performance trend of the power system can be timely evaluated and the abnormal modulation signal can be timely detected by calculating the sending performance trend index and the electrical performance trend index. Key information is provided for fault positioning and grading, the accuracy and response speed of fault detection are greatly improved, the influence of faults on a power system is reduced, and the reliability of power supply is improved.

A user device, UE, for a wireless communication system, like a 3rd Generation Partnership Project, 3GPP, system, is disclosed. The UE receives and / or transmits one or more physical channel transmissions. The one or more of the physical channel transmissions are received or transmitted without any associated DeModulation Reference Signal, DMRS, or with a partial or full DMRS muting.

A system can receive a message from a base station configured to communicate via a group of antenna ports, the message being indicative of conducting uplink communications of broadband cellular communications with the base station according to a first group of differing demodulation reference signal densities, wherein respective demodulation reference signal densities of the group of differing demodulation reference signal densities correspond to respective antenna ports of the group of antenna ports, and wherein communicating the broadband cellular communications for uplink communications according to the first group of differing demodulation reference signal densities is performed independently of a second group of demodulation reference signal densities that is configured for downlink communications. The system can use the group of differing demodulation reference signal densities to further communicate the broadband cellular communications with the base station.

The present application relates to devices and components including apparatus, systems, and methods to configure and used demodulation reference signals for device-to-device communications in, for example, new radio.

The invention discloses a time-frequency synchronization tracking and judging method based on GFSK (Gaussian Frequency Shift Keying). The method comprises the following steps: S1, positioning the initial position of a synchronization word by detecting a lead code; s2, extracting a fixed synchronization word, completing frame synchronization based on correlation matching, and positioning a starting point of an effective data segment; s3, a range cycle counter collects a central sampling point and two adjacent sampling points to form a candidate sampling point sequence; s4, dynamically and finely adjusting the range cycle counter to form a time sequence calibration sampling point sequence; s5, performing phase difference calculation on the time sequence calibration sampling point sequence, estimating continuous frequency offset and generating a compensation value; s6, applying the compensation value to construct a decision feedback equalizer with delay front and back terms; s7, performing interference suppression on the compensation sampling point sequence by using a decision feedback equalizer with delay front and back items, and outputting a soft decision value; and S8, executing three times of judgment, constructing a sliding reference sequence, and outputting a final bit judgment result. According to the method, the problem of poor GFSK demodulation robustness under Doppler disturbance is solved.

The invention discloses a time hopping code estimation and multi-hop coherent combination method and device for satellite communication, and belongs to the field of digital signal processing. A sending end disperses information symbols in specified time slots of different time frames for repeated transmission, the time slot where a sending signal is located is determined by a time hopping code, and both communication parties agree that the time hopping code changes randomly within a predetermined range. And a receiving end performs time hopping code and carrier phase joint estimation on the time hopping signal transmitted through the AWGN channel by using a cross entropy iteration method. Performing binary quantization on a time hopping code and a carrier phase, obtaining an estimated value of the time hopping code and the carrier phase according to a binary quantization bit generation probability, selecting a time slot where a signal is located and compensating the carrier phase, performing coherent combination on multi-hop signals, and selecting a sample with small combined signal-to-noise ratio loss to update the binary quantization bit generation probability. And iterating to obtain a global optimal vector group. According to the global optimal vector group, multi-hop coherent combination is realized, the demodulation signal-to-noise ratio is improved, and the reliability of time-hopping communication is effectively improved with low complexity.

A system can determine to communicate first broadband cellular communications with a user equipment, wherein the first broadband cellular communications are configured to be communicated via a group of antenna ports, wherein the first broadband cellular communications are for uplink communications according to a first group of differing demodulation reference signal (DM-RS) densities, wherein respective DM-RS densities correspond to respective antenna ports of the group of antenna ports, and wherein communicating the first broadband cellular communications for uplink communications according to the first group of differing DM-RS densities is performed independently of a second group of DM-RS densities that is configured for downlink communications. The system can communicate the first group of differing DM-RS densities for the uplink communications to the user equipment. The system can use the first group of differing DM-RS densities to further communicate the first broadband cellular communications with the user equipment.

The embodiment of the invention provides a signal processing circuit, a chip and electronic equipment. The signal processing circuit comprises an analog-to-digital conversion module and a signal amplification module, the first chopping switch module is used for modulating the differential input signal to high frequency under the control of a preset clock signal and inputting the signal to the signal amplification module; the second chopping switch module is used for modulating the differential output signal output by the signal amplification module to a low frequency under the control of a preset control signal and inputting the low frequency to the analog-to-digital conversion module; and the second chopping switch module also enables the analog-to-digital conversion module to establish sampling under the control of a preset control signal. According to the application, the second chopping switch module is multiplexed as a sampling switch of the analog-to-digital conversion module, so that the problem that on-resistance is increased due to the fact that a chopping demodulation switch and the sampling switch are arranged at the same time can be avoided.