161 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.

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 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 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.

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.

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.

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 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.

Disclosed is an electronic device comprising a communication circuit, a processor, and a memory for storing instructions. The instructions, when executed by the processor, may cause the electronic device to: acquire first channel sounding results by performing RTT-based ranging on an external electronic device; acquire second channel sounding results by performing phase-based ranging on the external electronic device; on the basis of comparing the first channel sounding results with the second channel sounding results, adjust the number of channels to be used to perform a channel sounding procedure on the external electronic device; and measure information related to the distance between the electronic device and the external electronic device by performing the channel sounding procedure via the communication circuit by using the adjusted number of channels.

A compressor near stall state voiceprint continuous monitoring method, system, medium and equipment, in the method, a predetermined number of microphone measuring points are randomly selected at the inlet to form a microphone array, and multi-channel sound pressure time domain signals are synchronously collected; a rectangular window is added to the multi-channel sound pressure time domain signal to construct an acoustic time domain signal segment, and a fast Fourier transform is performed on the multi-channel acoustic time domain signal segment in the current time domain window to form multiple sound pressure spectra; it is judged whether there are multiple non-synchronous single-tone characteristic frequencies which are non-integral multiples of the current rotation frequency in the sound pressure spectrum; a multi-channel microphone continuous frequency domain observation matrix of the non-synchronous single-tone characteristic frequency is constructed; an orthogonal Fourier transfer matrix is constructed based on the installation azimuth angle of the microphone sensor and the highest order of the mode; a compressor near stall characteristic mode reconstruction model under non-uniform few measuring points is established; the amplitude is solved based on the block orthogonal matching pursuit algorithm, and the compressor near stall working condition monitoring based on the voiceprint characteristics is realized.

The application provides a deep-water breakwater foundation settlement monitoring method and system, and relates to the technical field of ocean engineering. The method comprises the following steps: based on a breakwater design drawing, a plurality of hydrophone nodes are installed in at least two monitoring areas of an underwater foundation and connected to a monitoring host, and an underwater acoustic monitoring network is generated; the network nodes are controlled to synchronously collect underwater sound pressure fluctuation signals, and multi-channel sound pressure signal data is obtained; based on the data, two-by-two cross-correlation calculation is performed on different node channel signals, and a noise interference spectrum is obtained; time delay values and energy values of stable cross-correlation peaks in the spectrum are identified and measured, and cross-correlation function characteristic parameters are generated; finally, based on the parameters, a pre-trained settlement inversion model is used for calculation, and settlement distribution information of the breakwater foundation is generated, so that non-contact, wide-area, continuous and quantitative monitoring of the deep-water breakwater foundation settlement is realized.

A technique for wireless communication is disclosed. In one aspect, a first user equipment (UE) obtains one or more first reception characteristics of a channel sounding signal transmitted by a second UE during a first transmission timing of a detection duration, obtains one or more second reception characteristics of a channel sounding signal transmitted by the second UE during a second transmission timing of a detection duration, and performs one or more sensing operations based on the difference between the one or more first reception characteristics and the one or more second reception characteristics to indicate the presence, absence, or movement of an object.

Disclosed are a downlink channel prediction method, apparatus, device, medium and program product, applied to an access point (AP) in a wireless network, the wireless network including the AP and a site (STA) associated therewith, the method comprising: obtaining training data, the training data comprising first uplink data and a first sample tag, the first uplink data is used for determining first uplink channel state information UL CSI, and the first sample label is first real downlink channel state information DL CSI acquired through a channel detection process; training a basic model based on the training data to obtain a trained first target model, a loss function of the basic model being determined based on a first prediction DL CSI output by the basic model and a first sample label; acquiring second uplink data sent by the STA, wherein the second uplink data is used for determining second UL CSI; and inputting the second UL CSI into the first target model to perform downlink channel prediction processing, and generating a second predicted DL CSI, thereby improving the reliability and effectiveness of downlink channel state information acquisition.

A system includes an initiator, a reflector, and one or more passive nodes. The initiator and the reflector may participate in a channel sounding procedure, and the one or more passive nodes may listen in on the channel sounding procedure. The passive nodes may measure phase offset relative to their local oscillators and then transmit phase data to the initiator, the reflector, and / or a control node separate from the initiator and the reflector. The device receiving the phase data may then use that phase data to calculate distance and, from the distance, calculate spatial position. The system may be used to calculate a position of the initiator or of the reflector.

A method and device are implemented in a multi-channel sound decoder for injecting multi-channel comfort noise in a decoded multi-channel sound signal. Background noise in a decoded mono down-mixed signal is estimated, and comfort noise for each of a plurality of channels of the decoded multi-channel sound signal is calculated in response to the estimated background noise. The calculated comfort noise is injected in the respective channels of the decoded multi-channel sound signal.

Disclosed herein is a method performed by a first access point (AP) to perform an overlapping basic service set (OBSS) channel sounding procedure. The method includes transmitting a null data packet announcement (NDPA) frame to cause a second AP operating a second BSS to transmit a null data packet (NDP) frame, determining a transmission scheme that a station (STA) that is associated with the first AP is to use for transmitting a channel state information feedback frame based on information included in the NDP frame transmitted by the second AP, and transmitting a trigger frame to the STA to cause the STA to transmit the channel state information feedback frame, wherein the trigger frame includes an indication of the transmission scheme that the STA is to use for transmitting the channel state information feedback frame.

The application discloses a sound source direction estimation method, a head-mounted device and a computer readable storage medium. The method comprises the following steps: acquiring sound signals collected by each microphone channel in the head-mounted device; calculating band amplitude values corresponding to each first sub-band according to the amplitude values of each frequency point, wherein each first sub-band is a sub-band obtained by dividing a preset frequency range according to a mel scale; calculating band phase values corresponding to each second sub-band according to the phase values of each frequency point, wherein each second sub-band is a sub-band obtained by dividing the preset frequency range according to the mel scale; splicing the band amplitude values and the band phase values corresponding to each channel sound signal to obtain a first signal feature; and estimating a sound source direction estimation result based on the first signal feature by using a preset sound source direction estimation model. The application can realize a high-precision and low-power voice sound source direction estimation task at the chip end of the head-mounted device.

This invention discloses a multi-band transmission control method for power line communication networks, belonging to the field of communication technology. The method includes: the power line communication network having at least one new transformer substation and one old substation; communication nodes in the new substation support communication on newly added frequency bands, while communication nodes in the old substation only support communication on existing frequency bands; when communication nodes in the new substation need to communicate on the newly added frequency band, and the newly added frequency band overlaps with the existing frequency band, the transmission strategy of the target communication node enabling communication on the newly added frequency band is adjusted, including: restricting the target communication node from executing an adaptive transmission strategy based on the channel detection results of the newly added frequency band; and adjusting the signal transmission mode of the target communication node on the newly added frequency band to a low-speed transmission mode. This invention improves the communication reliability and transmission success rate of power line carrier signals in newly added frequency bands where new and old substations coexist.