304 results about "Frequency division multiplexed" patented technology

The invention relates to a hydrogen storage station safety monitoring method and system based on a wireless passive three-signal sensor, and belongs to the technical field of safety monitoring. Wireless passive three-signal sensor nodes are deployed in a hydrogen storage station to form a three-dimensional monitoring network; the temperature, strain and hydrogen detection units of the sensor are simultaneously excited through the multi-frequency-band signal transceiver, so that parallel acquisition of three-parameter signals is realized; performing signal decoupling, temperature compensation and primary risk assessment by using an edge computing gateway; deep data mining and risk assessment are carried out through a cloud early warning platform in combination with a digital twinborn model; wherein multi-parameter signal decoupling is realized by adopting a frequency division multiplexing and wavelet denoising algorithm, and safety early warning is carried out in combination with a three-level early warning decision tree. The hydrogen storage station electric spark risk can be eliminated, high-precision synchronous monitoring of temperature, strain and hydrogen concentration is achieved, and the hydrogen leakage early warning time is shortened.

The invention discloses an earthquake early warning device and method based on campus broadcast, and the method comprises the steps: carrying out the building response coupling analysis through receiving an early warning signal of an earthquake monitoring center, generating an earthquake magnitude-building coupling feature, and mapping the earthquake magnitude-building coupling feature into an enhanced early warning source adaptive to an acoustic environment; acoustic cavity detection is carried out based on threatened area identification, and differential playing topology is constructed; extracting a high-risk gathering area through personnel density scanning, generating personalized evacuation guiding content and determining a playing priority; high-precision time sequence control is realized by adopting a synchronous reference anchor point technology, and a multi-mode playing domain is constructed through carrier modulation and frequency division multiplexing; and finally, an acoustic navigation field is utilized to guide accurate scheduling and playing of audio signals, differential playing and accurate coverage of early warning information can be realized according to the anti-seismic characteristics and acoustic environment characteristics of different buildings, and an intelligent acoustic solution is provided for campus earthquake early warning.

The invention provides an MEMS (Micro Electro Mechanical System) micromirror array chip, a module and optical scanning equipment. The MEMS micromirror array chip comprises a plurality of micromirror structures, a substrate, a vertical lead structure and a capacitance angle sensing structure, according to the micro-mirror array chip integrated with the capacitive sensor, array-level real-time angle detection, feedback control and high-precision scanning angle detection are realized, and the micro-mirror array chip is fast in driving and resistant to interference; meanwhile, the wiring density is reduced by frequency division multiplexing isolation signals; in addition, the application of a monolithic integrated capacitance angle sensor in a high-density micro-mirror array chip is realized by a thick substrate with a silicon through hole; and finally, the micromirror array chip of the monolithic integrated capacitance angle sensor is used for precision optical scanning equipment, a photoelectric angle detector is omitted, optical scanning high-precision real-time angle detection and feedback control, high-precision angle detection and high-speed scanning are realized, the use design is convenient, and the cost is low.

Embodiments of the present disclosure relate methods and systems for transmitting downlink Orthogonal time frequency-division multiplexing (OTFDM) symbol. The method comprising time-multiplexing, by the transmitter, at least one of a primary synchronization signal (PSS) sequence, a secondary synchronization signal (SSS) sequence and a physical broadcast channel (PBCH) sequence to generate a multiplexed sequence. Also the method comprises processing, by the transmitter, the multiplexed sequence to generate a SS Block OTFDM symbol.

The application belongs to the technical field of distributed optical fiber sensing, and particularly relates to a long-distance distributed optical fiber broadband acoustic vibration sensing system. The application utilizes the same laser to transmit and generate back Rayleigh scattering light and interference light in the same sensing optical fiber, and further constructs a distributed optical fiber acoustic vibration sensing system combined with Φ-OTDR and MZI, which comprehensively utilizes the performance advantages of both, utilizes a very simplified optical system scheme, realizes the function fusion of the two sensing structures on one sensing optical fiber, reduces the resource waste caused by the transmission of sensing signals by different sensing optical cables respectively, maximizes the optical fiber resource utilization rate, and reduces the system cost; utilizes a frequency division multiplexing demodulation scheme in the digital domain, expands the frequency response range on the basis of ensuring the high positioning accuracy of the system, realizes the simultaneous detection of the two systems by a single core, simultaneously realizes the high positioning accuracy and the continuous non-blind area detection in the broadband frequency range, and improves the reliability.

A method according to an embodiment of the present specification comprises the steps of: receiving MSG1 related to a random access procedure from a device; and transmitting MSG2 to the device. A slot number related to the MSG1 is determined on the basis of a group ID related to CFRA. The group ID is related to a plurality of device IDs, and one of frequency division multiplexed resources is determined on the basis of the slot number.

Aspects of the present disclosure are directed to techniques to ensure that other UEs that may have reserved resources within the same resource selection window are allowed (or at least not prevented) from gaining access to the shared channel during their respective reserved resource period for both Out-of-COT and in-COT preemption window period.

Various aspects of the present disclosure generally relate to communication. In some aspects, a first device may determine a frequency division multiplexing (FDM) configuration for a set of component carriers associated with a cable frequency spectrum, wherein each component carrier in the set of component carriers is associated with a number of multiple input multiple output (MIMO) layers. The first device may communicate with a second device over a cable infrastructure according to the FDM configuration for the set of component carriers. Numerous other aspects are described.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit UE capability information associated with layer 1 (L1) inter-UE cross link interference (CLI) measurement and reporting, wherein the UE capability information includes information associated with at least one of: a capability related to a quantity of reported CLI resources, a report quantity capability, a reporting criteria capability, a measurement method capability, a reporting method capability, a capability related to configured CLI resources, or a capability related to frequency division multiplexed CLI measurement. The UE may receive at least one measurement resource configuration or at least one configuration associated with the L1 inter-UE CLI measurement and reporting, wherein the at least one measurement resource configuration or the at least one configuration is based on the UE capability information. Numerous other aspects are described.

The invention relates to the technical field of medical surgical navigation, and discloses an intraoperative instrument position real-time visual tracking system which comprises a preoperative three-dimensional reconstruction unit, an intraoperative positioning unit, a coordinate matching unit, an error compensation unit and a visual display unit which are in bidirectional communication through a data bus. According to the intraoperative instrument position real-time visual tracking system and method, the problem of electromagnetic interference is solved through a magnetoelectric fusion positioning engine and a dynamic magnetic field calibration module, and the magnetoelectric fusion positioning engine receives a gradient magnetic field signal generated by an electromagnet array and an electric field signal of a body surface reference electrode; the dynamic magnetic field calibration module is combined with the frequency division multiplexing technology to separate double-frequency signals, then space-time registration is carried out through the magnetoelectric conversion matrix, alignment of a magnetic sensor and a magnetic beacon coordinate system is not needed, magnetic field distortion caused by a metal instrument can be counteracted, angle calculation errors can be reduced through bimodal signal complementation even if the posture of the instrument changes, and the precision of the instrument is improved. And positioning accuracy is improved.

The application provides a phase-sensitive optical time domain reflectometer, a measurement method and a readable storage medium, wherein a signal generation circuit of the phase-sensitive optical time domain reflectometer is configured to generate a radio frequency signal to drive an optical intensity modulator to modulate probe light, so that two groups of frequency division multiplexing sequences with differences can be used to synchronously detect a sensing optical fiber to be measured, a differential unfolding algorithm is combined to accurately solve a phase change amount in adjacent sampling intervals, and then demodulation results corresponding to different frequency parts are respectively unfolded to obtain unfolded phase results, so that the problem of large strain phase folding is solved and a large strain range is recovered, and further, the unfolded phase results are rearranged and combined in time sequence through time sequence interleaving processing of the unfolded phase results, so that a high sampling rate and a distortion-free reconstruction result are reconstructed, and therefore, the application can realize accurate measurement of high frequency response and large strain range dynamic strain.

The invention discloses a TFDM-PON system correction method and device, and the method comprises the steps: an OLT receives a dual-polarization signal transmitted by an ONU based on time division multiplexing or time-frequency division multiplexing, the dual-polarization signal comprises a target signal sequence corresponding to X / Y polarization, and the target signal sequence is an IQ period complex signal, and an I path and a Q path of the IQ period complex signal are single-tone signals of a first frequency and a second frequency respectively; target parameters including target transmitting and receiving end frequency deviation, IQ time delays of a target transmitting end and a target receiving end and target power deviation among ONUs are calculated based on Fourier transform and frequency domain symmetry of the dual-polarization signals, so that the ONUs carry out frequency, time delay and power correction according to the target parameters. Subcarrier crosstalk caused by frequency offset in TDM uplink burst transmission, mirror image crosstalk caused by IQ imbalance and performance degradation caused by power imbalance between subcarriers are eliminated, the bit error rate is reduced, and the system robustness is improved.

The application discloses an anti-interference pulse laser frequency division multiplexing optical coding wireless communication system and method, provides an optical wireless communication system based on pulse laser, and realizes an anti-interference pulse laser frequency division multiplexing optical coding communication method. Relying on the convergence effect of the light collector, a stable and anti-interference system receiving end is realized, the anti-interference capability of the whole system is realized through a pulse laser source and a multi-channel light splitting module, the utilization rate of the spectrum in the system communication process is improved, and the pulse laser transmission of frequency division multiplexing is realized.

Methods and systems are disclosed for resource management on Sidelink for vehicle to everything (V2X) scenarios. Example methods and systems for a Resource Structure on Sidelink are disclosed. Control and data channels may be Frequency Division Multiplexed (FDMed) or Time Division Multiplexed (TDMed) with an Orthogonal Frequency Division Multiplexing (OFDM) waveform. Example methods and systems for a Resource Configuration on Sidelink are disclosed. The resource configuration may be statically configured or may be locally configured. Example methods and systems for Assisted Resource Allocation are disclosed. Assisted Sensing may be performed by a group lead or RSU and local scheduling may be performed by a group lead or RSU.

The invention relates to a communication method, a terminal, network equipment, a system and a storage medium. The method comprises: sending a first configuration parameter to a terminal, the first configuration parameter being used for determining first frequency information of an uplink communication signal, and receiving the uplink communication signal sent by the terminal according to the first frequency information, the uplink communication signal being carried by a back reflection signal corresponding to a CW signal. Therefore, the first frequency information of the uplink communication signal sent by the terminal is determined according to the first configuration parameter, and the uplink communication signal is transmitted based on the first frequency information, so that frequency division multiplexing of the Internet of Things equipment for backscattering based on the CW signal in the communication transmission process is realized.

Methods, systems, and devices for wireless communication are described. A first wireless device may receive, from a second wireless device, a first frequency modulated continuous waveform (FMCW) signal via an orthogonal frequency division multiplexing (OFDM) channel. The first wireless device may generate a second FMCW signal based on a set of FMCW parameters associated with the first FMCW signal. The first wireless device may combine the first and second FMCW signals and filter the combined FMCW signal. The first wireless device may sample the combined and filtered FMCW signal in a time domain. The first wireless device may estimate the frequency domain OFDM channel based on sampling the combined and filtered FMCW signal. The first and second wireless devices may communicate OFDM signals via the OFDM channel based on the estimation of the frequency domain OFDM channel.

Certain aspects of the present disclosure provide techniques for peak to average power ratio (PAPR) reduction for orthogonal frequency division multiplexing (OFDM). An example method, performed at a transmitter, includes generating a plurality of orthogonal frequency division multiplexed (OFDM) symbols, based on a constellation associated with a modulation scheme, adjusting a phase of at least one of the OFDM symbols based on at least one parameter that depends on a non-integer multiple of a phase distance between two points on the constellation, generating a Discrete Fourier Transform spread OFDM (DFT-s-OFDM) waveform based on the OFDM symbols after the adjustment, and transmitting the DFT-s-OFDM waveform to a receiver.

The present disclosure relates to an entity for generating a signal. The entity is configured to generate the signal by precoding a vector, the vector comprising a group of real elements and an offset. The entity is used for obtaining the group of real elements from an orthogonal frequency division multiplexing (OFDM) signal, and obtaining the offset from the group of real elements, and the method comprises the following steps of: obtaining the group of real elements from the orthogonal frequency division multiplexing (OFDM) signal; in addition, the present disclosure relates to an entity for generating an orthogonal frequency division multiplexing (OFDM) signal, and to a method for generating an orthogonal frequency division multiplexing (OFDM) signal. The entity is configured to generate the OFDM signal by grouping samples of a signal into a plurality of groups and post-encoding each of the plurality of groups to generate post-encoded samples of the signal.

A user device may receive from a network node information associated with uplink transmission of a data symbol, wherein the information includes at least one of: a set of phase shift values, or a set of scaling parameters. The user device may modify the data symbol, wherein the modifying includes modifying a subcarrier associated with the data symbol by at least one of: shifting a phase of the subcarrier by a phase shift value of the set of phase shift values or scaling an amplitude of the subcarrier by a scaling parameter of the set of scaling parameters. The user device may transmit to the network node, a modified orthogonal frequency division multiplexing symbol based on the modified data symbol.

A kind of well temperature field reconstruction and thermal disaster early warning method and system based on acoustic tomography, method: staggeredly arranging explosion-proof loudspeaker array and microphone array on the two sides of roadway in monitoring area;Utilize frequency division multiplexing technology to emit / receive multiple frequency band acoustic waves synchronously, form entity acoustic path data set, and construct overdetermined equation group;Adopt virtual sound line method, realize virtual path enhancement;Realize high-resolution temperature field reconstruction of roadway cross section temperature field in combination with sound velocity-temperature linear model;Continuous multiple frame temperature field images are input into TimesNet model, and multi-scale features are extracted by adaptive period decomposition and two-dimensional space-time convolution, and fire warning grade and abnormal area coordinates are output.The system: including explosion-proof loudspeaker array, microphone array, edge computing node and host computer;Edge computing node is connected with explosion-proof loudspeaker array and host computer respectively.The present application can realize global temperature perception and concealed fire early warning in target monitoring area.

The invention relates to a resource allocation method and device for a multi-user orthogonal frequency division multiplexing system. The method comprises: sending a channel assessment message carrying a pre-configured channel assessment frame to a plurality of user nodes, the channel assessment message being used for indicating each user node to perform channel assessment according to the received channel assessment frame, and feeding back an average channel gain and an average signal-to-noise ratio obtained by assessment to a main node, the pre-configured channel evaluation frame is obtained based on configuration of a preset orthogonal frequency division multiplexing symbol sequence; receiving an average channel gain and an average signal-to-noise ratio fed back by each user node; and for each user node, determining a target bit number and target sending power allocated to the user node according to the average channel gain and the average signal-to-noise ratio fed back by the user node, generating a channel resource configuration frame according to the target bit number and the target sending power, and sending the channel resource configuration frame to the user node. By adopting the method, the calculation complexity of resource allocation can be reduced.

Methods, systems, and devices for wireless communications are described. Described techniques provide for procedures, conditions, and signaling, based on which a user equipment (UE) may determine whether to transmit uplink control information (UCI) via a single repetition or multiple repetitions when two frequency division multiplexed (FDM) repetitions are scheduled for a UE. For example, the network may indicate that the UE is to adopt a first behavior (e.g., transmit UCI via a single repetition) or a second behavior (e.g., transmit UCI via both repetitions). If the UE is configured to transmit the UCI via both repetitions, then the UE may determine if one or more conditions are satisfied. If such conditions are not met, then the UE may default to the first behavior. The UE may determine which behavior to apply based on explicit signaling from the network, a type of UCI, or a combination thereof.

The application provides a bandwidth expansion method and device based on Rydberg atoms. The bandwidth expansion method comprises processing a received original signal to obtain a plurality of microwave signals corresponding to the original signal, wherein the plurality of microwave signals comprise a first microwave signal and a second microwave signal; performing mixing processing on the first microwave signal by a first atomic gas chamber to obtain a first bandwidth signal, and performing mixing processing on the second microwave signal by a second atomic gas chamber to obtain a second bandwidth signal; and synthesizing the first bandwidth signal and the second bandwidth signal by using a frequency division multiplexing method to realize bandwidth expansion. According to some embodiments, different Rydberg final states are prepared by using microwave signals of different frequencies, and the original signal is decomposed into a plurality of signals by using a frequency division multiplexing technology to realize multi-channel data transmission by loading the signals into the microwave signals, thereby realizing high-bandwidth multi-channel data transmission communication and bandwidth expansion.

A frequency division multiplexing functional chip comprises a first straight waveguide, a second straight waveguide, a third straight waveguide, a first echo wall mode micro-ring waveguide, a second echo wall mode micro-ring waveguide, a third echo wall mode micro-ring waveguide, a fourth echo wall mode micro-ring waveguide, a fourth echo wall mode micro-ring waveguide, a third echo wall mode micro-ring waveguide and a fourth echo wall mode micro-ring waveguide. Wherein the first straight waveguide, the first echo wall mode micro-ring waveguide, the second echo wall mode micro-ring waveguide and the second straight waveguide form a group of uploading-downloading echo wall mode micro-ring resonant cavities; the first straight waveguide, the third whispering gallery mode micro-ring waveguide, the fourth whispering gallery mode micro-ring waveguide and the third straight waveguide form another group of uploading-downloading whispering gallery mode micro-ring resonant cavities, and the two groups of uploading-downloading whispering gallery mode micro-ring resonant cavities are different in resonant frequency; resonance is generated and filtering screening is carried out on the specific-frequency terahertz signals transmitted by the first straight waveguide, so that a frequency division multiplexing function is realized. According to the invention, the dense narrowband frequency division multiplexing function is realized, and the narrowband frequency division multiplexing of the terahertz device is enriched.

The invention provides a method executed by user equipment (UE) and the UE. The method comprises the following steps: UE in an idle state or an inactive state receives configuration parameters of low-power-consumption wake-up signal (LP-WUS) resources from a base station; and the UE configures a frequency division multiplexing coefficient in the parameters according to the LP-WUS resource; a time domain repetition coefficient; and transmitting at least one of the configuration indication TCI parameters, determining a plurality of LP-WUS detection opportunities (LP-WUS MO) for detecting the LP-WUS, and a reference signal related to the LP-WUS MO. Therefore, the UE can correctly determine a plurality of opportunities for detecting the wake-up signal, the connection between the UE and the network is maintained, and the power consumption of the UE is reduced.

Methods, systems, and devices for wireless communications are described. In some examples, an ambient internet of things (AIOT) device may receive synchronization signals associated with orthogonal frequency division multiplexed (OFDM) signaling. For example, the AIOT device may receive one synchronization signal indicating whether the OFDM signal includes a cyclic prefix, a cyclic prefix duration, and a starting OFDM symbol of the OFDM signal. Alternatively, the AIOT device may receive a first synchronization signal indicating the cyclic prefix duration and the starting OFDM symbol for the OFDM signal and may receive a second synchronization signal indicating whether the OFDM signal includes the cyclic prefix. The AIOT device may determine an OFDM symbol boundary based on the synchronization signals. The AIOT device may skip a cyclic prefix of the OFDM signal based on the cyclic prefix duration, the starting OFDM symbol, and the OFDM symbol boundary.

The invention belongs to the technical field of power distribution network communication processing, and particularly relates to a multi-device converged communication processing method for power distribution network automation. Equipment sub-signals adopt single modulation and are distributed with different frequency bands, and a multi-channel transmission scheme is established by adopting a frequency division multiplexing carrier modulation method based on a power distribution network communication system; signal modulation processing based on a power distribution network transmission environment; and respectively performing transmission optimization on the data by using the sending end and the receiving end. On the basis of the existing transmission network, the information transmission efficiency and capability, especially the capability of multi-device joint communication processing, are further enhanced.

The invention relates to the technical field of communication and radars, in particular to a power distribution method and device for a broadband orthogonal frequency division multiplexing radar, which are used for solving the problem that the target distance and speed estimation precision are influenced due to beam offset in the existing OFDM radar power distribution. Determining a subcarrier power allocation scheme under the maximum signal-to-noise ratio criterion as initial power allocation; determining subcarrier power distribution under a maximum sidelobe level criterion as secondary power distribution by solving a continuous convex approximation optimization problem; performing linear combination on the initial power distribution and the secondary power distribution through a plurality of linear combination weights to obtain combined power distribution under the plurality of linear combination weights; and finally, according to a constructed error detection probability formula, successively calculating error detection probabilities under each linear combination weight, and determining the combination power distribution with the minimum error detection probability value as a final power distribution scheme.

The present application provides a data transmission method and device. The method comprises: when a DMRS sequence in a DMRS symbol is frequency division multiplexed with first data in the DMRS symbol, a first device multiplying the first data by a coefficient β, wherein coefficient [equation]; outputting the DMRS symbol and a data symbol to a second device, wherein the data symbol comprises second data, and the DMRS symbol and the data symbol are located on different time domain resources; and indicating a first EPRE ratio and / or a second EPRE ratio to the second device, wherein the first EPRE ratio is related to β, the second EPRE ratio is related to β, the first EPRE ratio represents the ratio of EPRE of the first data to EPRE of the DMRS sequence, and the second EPRE ratio represents the ratio of EPRE of the second data to EPRE of the DMRS sequence. By means of the implementation, the data transmission efficiency during frequency division multiplexing of the DMRS sequence and a single carrier sequence can be improved.

Systems and method provide for uplink carrier aggregation (UL CA) that is configured for a User Equipment (UE), and transmissions on multiple UL carriers by one power amplifier (PA). When a base station (e.g., a gNB) indicates the UE should switch its UL waveform from Cyclic-Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) to Discrete Fourier Transform Spread OFDM (DFT-S-OFDM) for Physical Uplink Shared Channel (PUSCH) transmission in one or more UL carriers, the base station expects that the UE transmit power on a particular carrier can be increased, the carrier for which a UL coverage issue (e.g., low signal strength, signal to noise ratio, interference, etc.) is found. UL waveform switching from CP-OFDM to DFT-S-OFDM can improve the lower bound of PCMAX, namely the total UE transmit power on UL carriers of intra-band CA.