271 results about "Channel sounding" patented technology

The invention relates to a microphone array sound source positioning method and system based on cross-correlation-beam forming closed-loop optimization, and belongs to the technical field of sound source positioning. The method comprises the following steps: collecting multichannel sound signals through a microphone array and preprocessing the multichannel sound signals to extract time-frequency features and suppress noise interference; time delay information among the microphones is estimated by adopting a generalized cross-correlation phase transformation algorithm, and an optimization strategy is introduced to improve estimation stability and anti-interference performance; enhancing the target sound source signal in combination with a minimum variance undistorted response beam forming algorithm and an adaptive Kalman filtering mechanism; constructing a closed-loop feedback optimization mechanism based on the beam output signal to realize feedback adjustment; and adopting a hybrid network architecture, taking the beam output signal amplitude spectrum as input, and outputting the frequency spectrum or mask of the obtained target sound source signal. The method has the advantages of high calculation efficiency, high positioning precision and strong anti-interference capability, and is suitable for real-time acoustic signal processing in a complex environment.

The invention relates to the technical field of unmanned aerial vehicle communication, and discloses a dynamic spectrum frequency hopping communication method and device for a target aircraft and a ground station, and the method comprises the steps: collecting state information; evaluating a signal quality indicator based on the power data; based on the total spectral range and the signal quality index, segmenting the total spectral range into N sub-bands to obtain a spectrum allocation result; based on the task priority and the communication quality index, carrying out main target machine election; each target machine sends an orthogonal detection sequence in a corresponding time slot to obtain channel state information; converting the channel state information into a frequency hopping key; generating a frequency hopping sequence based on the frequency hopping key; according to the invention, an adaptive frequency hopping technology based on a channel state is adopted, the channel quality is monitored in real time, and a dynamic frequency hopping sequence is generated, so that an interference frequency band is effectively avoided; through a time division multiplexing channel detection mechanism, signal overlapping is fundamentally avoided, and continuous and stable operation in a complex dynamic environment is ensured.

This disclosure describes systems, methods, and devices for configuring sounding reference signal resources across multiple frequency locations for device positioning. A device may encode for transmission a sounding reference signal (SRS) including a first set of SRS resources for a first transmission by a user equipment (UE) device to the node B network device at a first time and a second set of SRS resources for a second transmission by the UE device to the node B network device at a second time; decode the first transmission received from the UE device using the first set and a first bandwidth at the first time; decode the second transmission received from the UE device using the second set and a second bandwidth at the second time; and combine the first transmission and the second transmission for a device positioning estimation based on the first bandwidth and the second bandwidth.

The invention discloses a secure data transmission method for a wireless communication system, which relates to the technical field of secure data transmission and comprises three steps of key generation and synchronization, physical layer subcarrier encryption and key enhancement and authentication. The method comprises the following steps: firstly, extracting multi-dimensional features through channel detection to generate a dynamic initial key, and setting a trigger condition to realize key synchronization; then, a permutation matrix is generated by using a secret key to perform scrambling encryption on a data subcarrier position, and a receiving end performs descrambling and then performs feedback through CRC verification so as to guarantee data integrity; and finally, quantum noise is introduced to enhance the randomness of the secret key, and zero-knowledge authentication is adopted to verify the identity, so that the security and the anti-attack capability of wireless communication data transmission are effectively improved.

A wireless communication method and a device are provided. A first access point multi-link device (AP MLD) sends or receives a multi-AP MLD sounding announce frame. The multi-AP MLD sounding announce frame indicates at least one of: a sequence in which a plurality of AP MLDs perform channel sounding, a time at which the plurality of AP MLDs perform channel sounding, information of links used for the plurality of AP MLDs to perform channel sounding, information of a frequency band used for the plurality of AP MLDs to perform channel sounding, or information of a channel corresponding to the links and / or the frequency band used for the plu

The invention provides a partial discharge mode recognition method based on multi-channel sound signal time-frequency space spectrogram fusion, and belongs to the technical field of partial discharge mode recognition. The problem that information redundancy and difference between existing multi-channel sound signals cannot be effectively fused and discriminant features cannot be extracted is solved. The method comprises the following steps: collecting and summarizing multichannel sound signal data corresponding to different partial discharge models as a data set; performing normalization processing on the original multichannel partial discharge sound signal, and mapping a time domain signal into time-frequency joint distribution to obtain a gray scale time-frequency spectrogram; performing multi-scale and multi-direction decomposition on the grayscale time-frequency spectrogram to obtain each channel sub-graph; different fusion strategies are used for fusing the channel sub-graphs obtained through decomposition; reconstructing a time-frequency space fusion spectrogram from the fused sub-graphs of each channel through inverse transformation; extracting features; identifying a partial discharge mode; the method is applied to partial discharge detection.

The invention provides a cast-in-place pile quality online monitoring method and system based on an ultrasonic array, and the method comprises the steps: transmitting and receiving ultrasonic waves through the ultrasonic array arranged in a cast-in-place pile, and obtaining a multi-channel sound wave signal; performing generalized S transformation processing on the multichannel sound wave signals to obtain a time-frequency matrix, and calculating a cross correlation coefficient between each channel signal and the defect-free reference signal; an amplitude matrix and an instantaneous phase gradient matrix are calculated based on the time-frequency matrix, neighborhood amplitude energy and a phase consistency factor are fused in a time-frequency domain, and a defect energy indication diagram of the pile body section is generated; calculating the energy entropy of the defect energy indication diagram in a full frequency band; and extracting an actually measured energy arrival time sequence, comparing the actually measured energy arrival time sequence with a theoretical arrival time sequence to construct a space distortion vector, and setting a threshold value by combining energy entropy to judge defects.

The invention discloses a robot dog monitoring system for bird sound source positioning and tracking, and the system comprises a sound collection module which is used for collecting a multi-channel sound signal, and carrying out the preprocessing of the multi-channel sound signal; the edge calculation module is used for processing based on the preprocessed multi-channel sound signals to obtain a sound source positioning result; the robot dog motion control module is used for receiving the sound source positioning result, performing path planning in combination with a control algorithm, driving a robot dog to autonomously move to approach a sound source, and integrating a sound source array sensor to realize environment perception and navigation; the image recognition module is used for constructing a bird recognition model and deploying the bird recognition model in an image recognition sensor to obtain a bird recognition result; and the remote monitoring module is used for receiving and displaying the sound source positioning result, the motion trail of the robot dog and the bird recognition result in real time. According to the invention, an efficient and intelligent solution is provided for bird monitoring.

The invention provides a communication method, terminal equipment and network equipment. The method comprises: a terminal device receiving first information sent by a network device, the first information being used for triggering receiving or sending of a target signal, the target signal comprising one or more of the following: an uplink reference signal; a downlink reference signal; a CSI; wherein the first information is sent by the network equipment in an uplink random access process; or the first information is sent by the network equipment in the process that the auxiliary cell is activated or quits the dormant state. The first information used for triggering the uplink reference signal, the downlink reference signal or the CSI is transmitted in advance to an uplink random access process, an auxiliary cell activation process or an auxiliary cell quit a dormant state, so that the signals are transmitted as early as possible, the transmission delay of the signals is reduced, and the transmission efficiency is improved. And the time delay from the state switching of the terminal equipment to the channel detection is shortened, so that the network decision is facilitated.

The invention, which relates to the technical field of audio experience, discloses an immersive audio experience-oriented sound sound field orientation system comprising a position sensing module, a sound field modeling module, a characteristic sound wave generation module, an array control module and a space feedback adjustment module. The position and orientation information of a target user in a three-dimensional space is obtained in real time through a non-contact sensor, a real-time acoustic propagation model containing reflection surface distribution and material characteristics is constructed, a multi-channel acoustic signal is generated based on the model, a loudspeaker array is driven to produce sound through a beam control parameter set, and the sound transmission effect is achieved. According to the invention, the spatial focusing of the sound beam in the target direction is realized, the sound production delay and phase difference of each loudspeaker unit are dynamically adjusted based on the direction deviation information of the received sound pressure, and a closed-loop control path is formed. The method is suitable for various scenes such as virtual reality, intelligent cinemas and voice interaction.

The invention discloses an Internet of Things networking scheduling method for railway tunnel disaster prevention illumination and evacuation indication, and relates to the technical field of railway tunnel disaster prevention. Comprising the following steps: S1, tunnel end monitoring equipment actively initiates environmental channel detection through a power line carrier communication network, scans impedance characteristics, noise levels and attenuation characteristics of different line sections in a tunnel, establishes a dynamic channel fingerprint database, and records an optimal communication frequency point and a channel quality threshold; and S2, performing real-time linkage between the local center monitoring main station and a fire alarm system, and after receiving a fire alarm signal, immediately generating a dynamic evacuation path through a disaster evolution prediction model according to a fire alarm position, a smoke diffusion state and a real-time channel state. The power line carrier communication module is utilized to actively perform channel detection and electrical parameter acquisition, a state channel fingerprint database is established, and fault diagnosis and state grading are performed based on the state channel fingerprint database, so that the overall reliability and maintainability of the scheme are improved, and the availability of equipment in a disaster is ensured.

The application relates to the technical field of acoustic signal processing. A three-dimensional sound event accurate identification and positioning method based on AI and a multi-microphone array is provided, which comprises the following steps: acquiring a multi-channel sound signal; performing frame windowing processing on the multi-channel sound signal to obtain time-frequency domain information; generating mel feature information; performing time-space joint feature extraction to generate an initial event category and a three-dimensional direction code; generating multi-angle virtual sound field data by combining the attenuation relationship between the sound source direction and the microphone angle through a simulation algorithm; inputting the real-time collected multi-channel sound signal into an optimized three-dimensional sound detection model for reasoning, and outputting an optimized event category and a three-dimensional direction code; performing dynamic calibration to generate a real-time calibrated three-dimensional sound detection model, so as to solve the problems of insufficient multi-dimensional distribution characteristic capturing capability of a three-dimensional sound field, limited model generalization capability caused by single data training and static environment assumption, and insufficient real-time adaptability under dynamic noise interference and long-term performance attenuation.

An access point station (AP) configured for multi-AP operation in an EHT network, when configured for multi-AP coordinated beamforming (CBF) and / or multi-AP joint transmission (JT) may operate as a master AP (API) and implement a multi-AP channel sounding protocol. The AP1 may be configured to encode a NDPA frame for transmission to poll one or more intra-BSS stations (STA11...1N) associated with the AP1 and one or more OBSS STAs (inter-BSS STAs) (STA21...2N) associated with a slave second AP (AP2). The AP1 may also be configured to encode a first NDP (NDP1) frame for transmission an SIFS after the NDPA frame. The NDP1 may be transmitted concurrently with a second NDP (NDP2) transmitted by the AP2. The AP1 may also be configured to encode a beam-forming refinement phase (BFRP) trigger frame for transmission an SIFS after the NDP1 frame. The BFRP trigger frame may identify both the one or more BSS stations and the one or more OBSS STAs. The AP1 may also be configured to decode CSI report frames in TB PPDUs received from the BSS stations in the BFRP trigger frame and CSI report frames received from the OBSS STAs identified in the BFRP trigger frame.

A system and method to determine a range between a first device (e.g., an object device) and a second device (e.g., a remote device) based on a characteristic of phase determined with respect to transmissions from a first device to the second device, and optionally a return transmission from the second device back to the first device.

A method performed by a station (STA) associated with a first access point (AP), wherein the first AP is part of a multi-AP (MAP) set comprising the first AP and at least a second AP, may compromise: receiving, from the second AP that the STA is not associated with, a null data packet announcement (NDPA) frame, the NDPA frame including a Special STA Info field including an association identifier (AID) relating to the association between the STA and the first AP; receiving a null data packet (NDP) frame from the second AP that the STA is not associated with; and transmitting, to the first AP, feedback based on the NDP frame.

The invention discloses a transformer fault diagnosis method fusing phase positioning and a self-adaptive voiceprint map, and relates to the technical field of power equipment state detection. The method comprises the following steps: collecting multichannel sound wave signals through a sound wave sensor, and estimating the spatial position of a fault source; performing weighted fusion on the multi-channel sound wave signal by using the positioning information to generate a main signal; performing adaptive window long and short time Fourier transform and trainable Mel filter bank processing on the main signal to generate a two-dimensional voiceprint map; according to the method, the map is processed in combination with spatial position information, the enhanced voiceprint map is input into a probability distribution mapping module, deep fusion and mutual verification of fault type identification and spatial positioning are realized, and the system performance is continuously improved through a closed-loop optimization mechanism. The transformer fault diagnosis method effectively solves the problems that in a traditional transformer fault diagnosis method, signal fusion is insufficient, feature extraction self-adaptive capacity is weak, diagnosis and positioning are separated and the like, and the accuracy, reliability and self-adaptive capacity of transformer fault diagnosis are improved.

The invention provides a fan blade fault detection method and system based on a neural network, and relates to the field of wind driven generator health monitoring, and the method comprises the steps: obtaining a multi-channel sound signal of a to-be-detected wind driven generator blade, and carrying out the preprocessing; inputting the preprocessed multi-channel sound signals into the trained fault detection model for fault detection to obtain fault level information; wherein the fault detection model firstly performs spatial feature enhancement on a preprocessed multichannel sound signal through a graph convolutional network, then learns a time-based dependency relationship of the feature after spatial enhancement by using a self-adaptive multi-head attention fusion mechanism based on transformer and fuses the feature with physical information, and finally performs fault detection on the multi-channel sound signal based on the adaptive multi-head attention fusion mechanism. Classifying fault levels based on the fused features; the multi-channel monitoring data of the wind driven generator is acquired by using the microphone array, and real-time monitoring and fault analysis of the running state of the wind driven generator are realized through the fault detection model based on time-space fusion.

Systems, methods, and devices locate and identify wireless devices within operational environments such as automobile environments. Methods include determining, using one or more processors of a central wireless device, one or more identifiers associated with a peripheral wireless device, and performing, using the one or more processors, a wireless exchange with the peripheral wireless device, the wireless exchange comprising one or more channel sounding operations compatible with a wireless communications protocol. Methods further include determining a plurality of estimated distances based on channel sounding data obtained by the central wireless device and received from a plurality of remote wireless devices based on the wireless exchange, and determining a location and identity of the peripheral wireless device within an operational environment based on the plurality of estimated distances and the one or more identifiers.

This disclosure provides methods, components, devices and systems for carrier frequency offset compensation between access points for coordinated beamforming sounding and transmission. During a channel sounding phase of a CBF operation, a first AP acting as a frequency reference may transmit a frequency reference frame. A second AP may use the frequency reference frame to estimate a CFO and pre-compensate for the CFO for subsequent transmissions during the channel sounding phase and during a transmission phase of the CBF operation. In some examples, the first AP may own a shared TXOP of the transmission phase. The second AP may receive a frequency reference frame for estimating the CFO. In some other examples, the second AP may own the shared TXOP. The second AP may request the first AP to transmit the frequency reference frame. Alternatively, the second AP may use a CFO value estimated during the channel sounding phase.

There is provided techniques for performing an uplink reference signal transmission for downlink channel sounding. A method is performed by a UE being equipped with more antennas than receive chains. The method comprises sending a report to a network node serving the UE. The report comprises an indication of the UE supporting uplink reference signal based downlink channel sounding for reciprocity-based downlink transmission and indicates that the UE is equipped with more antennas than receive chains. The method comprises receiving uplink reference signal configuration from the network node. The uplink reference signal configuration is based on the report and comprises configuration of a set of uplink reference signal resources. According to the uplink reference signal configuration, at least one uplink reference signals is to be transmitted per antenna. The method comprises transmitting the uplink reference signals on the set of uplink reference signal resources in accordance with the uplink reference signal configuration.

The invention relates to the technical field of wireless communication, and particularly discloses a zero-handshake transient connection establishment method and system based on an Auracast protocol, and the method comprises the steps: generating a composite signal containing a user space position vector and a one-time authorization token, generating a motion feature tag based on the position change, and activating directional scanning only when an approaching or staying intention is detected; a connection environment quality report is generated through multi-channel detection, and the channel congestion degree, the transmission delay and the signal strength are dynamically evaluated; meanwhile, according to the environment quality, a customized connection scheme is generated, an optimal channel and transmission parameters are automatically selected, and after an audio stream receiving service is established, through continuous monitoring of user position changes, instant disconnection is triggered when a departure intention is detected, and full-process automatic connection life cycle management is formed. The problem that the connection process in the public broadcast audio service field is lack of intelligence is effectively solved, automation of connection initiation is realized, and the connection efficiency and the user experience are remarkably improved.

The application discloses a dynamic bit and power loading method suitable for power line carrier communication, which comprises the following steps: a sending end and a receiving end train and prestore at least one subcarrier allocation table (SAT) set through channel detection; mode indication information of a Payload part is set in frame control information of a physical layer of the sending end, and when the mode indication information is in a dynamic loading mode, dynamic loading parameters required by the dynamic loading mode are determined; corresponding dynamic loading mode SAT_ID parameters are selected according to the dynamic loading parameters, and the corresponding SAT_ID parameters are configured in corresponding bit positions of the frame control information; after the corresponding SAT_ID parameters are configured, a load time domain waveform is generated according to the selected dynamic loading parameters from the subcarrier allocation table (SAT) set; the load time domain waveform, a preamble and a frame control time domain waveform are combined to form a complete physical layer data packet time domain waveform, and the complete physical layer data packet time domain waveform is transmitted to a power line channel for transmission.

A method of testing phase-based ranging includes the following. A respective first phase correction term in response to a channel sounding procedure is measured for a first carrier frequency of a carrier signal by a device under test and a test and / or measurement instrument, respectively. A first channel phase offset is calculated for the first carrier frequency based on the measured first phase correction terms. A respective second phase correction term is measured for a second carrier frequency of the carrier signal by the device under test and the test and / or measurement instrument, respectively. A second channel phase offset is calculated for the second carrier frequency based on the measured second phase correction terms. A phase is altered in order to emulate a different distance between the test and / or measurement instrument and the device under test. Further, a test and / or measurement system is described.

This invention discloses an active coupling cavity device and calibration method for calibrating a standard microphone. A sound source adapter is located at the signal input end of the active coupling cavity. A multi-channel sound field distribution structure is located within the active coupling cavity, comprising eight acoustic channels evenly distributed circumferentially along the central axis of the active coupling cavity. A symmetrical clamping assembly constrains the reference microphone and the microphone under test to be symmetrical about the central axis of the active coupling cavity. A coaxiality test ring assembly rigidly constrains the axes of the reference microphone and the microphone under test to coincide with the central axis of the active coupling cavity. The calibration test system includes a signal generator, a sound level meter under test, a preamplifier, a measurement amplifier, a bandpass filter, and a digital voltmeter. The multi-channel uniformly distributed sound field structure solves the problem of uneven sound pressure distribution caused by unidirectional input, and the symmetrical clamping assembly and the coaxiality test ring assembly respectively solve the problem of poor consistency in low-frequency and high-frequency phase measurements.

Methods and apparatuses for facilitating enhanced channel quality measurements on links of a multi-link device (MLD) in a wireless local area network. A non-access point (AP) MLD comprises stations (STAs), each comprising a transceiver configured to form a link with a corresponding AP affiliated with an AP MLD and receive, over the link, a channel sounding signal. The non-AP MLD further comprises a processor configured to determine, based on the channel sounding signal received at a first time over a first one of the links, an initial channel quality indicator (CQI) value for the first link, and determine, based on interference caused on the first link by a second one of the links at a second time, a CQI offset value for the first link relative to the initial CQI value. The transceivers are configured to transmit, to the AP MLD, the initial CQI value and the CQI offset value.

The invention provides a power line communication method and device which are applied to a power line carrier communication system. The method comprises the following steps: a first node sends a first frame and receives a first channel detection result; wherein the first frame comprises a first training domain and a first load area, the first load area is used for bearing first service data, and the first training domain is used for channel detection. The first channel detection result comprises a first communication parameter, and the first communication parameter is determined according to the first frame. By adopting the method, the first node can transmit the first service data to the second node by sending the first frame, and can also indicate the second node to perform channel detection through the first training domain, thereby reducing the interaction process between the nodes, avoiding resource waste and improving the communication efficiency.

The application discloses a Bluetooth channel sounding high-precision ranging SOC method, a chip and equipment. The method comprises the following steps: controlling a radio frequency transceiver front end to output a data frame and a received signal strength quantization value, a direct memory access controller carries the data frame to a memory of a channel sounding coprocessor, the coprocessor compares the quantization value with a multipath deep fading threshold value, and when the quantization value is lower than the threshold value, corresponding data is overwritten as a digital zero, a polar coordinate system conversion forms a frequency domain channel response array, an inverse fast Fourier transform is performed to extract a line-of-sight path main peak and calculate a first distance value, a high-frequency counter records a physical round trip time and converts a second distance value, a hardware interlocking comparator calculates a difference value, and when the difference value exceeds a safety tolerance window, a blocking instruction is sent to the direct memory access controller. The application can solve the data distortion problem in a multipath environment and eliminate the delay vulnerability of the anti-relay attack of the physical layer.

The invention relates to a fusion positioning method and system based on Bluetooth channel detection and ultra-wideband distance measurement, electronic equipment and a storage medium. The intelligent triggering of low-power-consumption initial distance measurement and fine positioning is realized by adopting a Bluetooth channel detection function; the ultra-wideband module is awakened as required for high-precision measurement; and based on the real-time channel quality index, dynamic weighted fusion is carried out on the ranging results of the Bluetooth and the ultra wide band. According to the invention, the technical problem that high precision and low power consumption cannot be considered at the same time in the prior art is solved, the UWB-level positioning precision is obtained at the power consumption cost close to Bluetooth, the positioning reliability and cruising ability of the system in a complex environment are remarkably improved, and a feasible technical scheme is provided for large-scale high-precision indoor positioning application.

The present application belongs to the technical field of communications. Disclosed are a signal transmission method and apparatus, a terminal, and a network side device. The signal transmission method in the embodiments of the present application comprises: a terminal acquiring search window information associated with a target reference signal (RS); and the terminal measuring the target RS of a first cell on the basis of the search window information, wherein the target RS is used for at least one of mobility management, time-frequency tracking, channel sounding, information demodulation, positioning, sensing, synchronization, and phase tracking.

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.