418 results about "Frequency division multiplexed" patented technology

A method performed by a WTRU may include receiving a random access channel (RACH) configuration indicating a plurality of RACH occasions. The RACH occasions within respective subsets are frequency division multiplexed. The method includes receiving configuration information indicating at least one transmit power threshold and information indicating resources associated with a mode of operation, and receiving criteria for selecting a RACH occasion that defines a group of RACH occasions from at least one subset that overlap with at least one uplink subband. The method includes sending a preamble transmission using a calculated transmit power in a selected RACH occasion, wherein, on a condition the calculated transmit power exceeds the transmit power threshold, the selected RACH occasion is selected from the defined group of the plurality of RACH occasions that overlap with the at least one uplink subband.

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 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 relates to a phase-sensitive optical time domain reflectometer based on a parallel frequency division multiplexing sequence. Continuous laser is divided into a local path and a detection path through an optical coupler; the local path is input to the polarization coherent receiving module, the detection path is converted into a pulse laser sequence with intensity modulation through a light intensity modulator driven by a radio frequency signal provided by the signal generation circuit module, and the radio frequency signal is composed of two frequency division multiplexing sequences with difference; the pulse laser sequence enters the sensing link to be measured to generate Rayleigh backscattered light, and the Rayleigh backscattered light and local continuous laser are subjected to beat frequency coherent receiving through a circulator; and the signal acquisition circuit is used for sampling and analyzing the interference signal, and performing frequency domain comparison on an interleaving result of the two frequency division multiplexing pulse sequences to eliminate a harmonic frequency and retain a real strain signal frequency. Compared with the prior art, the non-harmonic strain signal measurement is realized, the high-frequency response performance and the high-precision strain measurement capability are excellent, and meanwhile, the long-distance coverage capability is also realized.

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.

A terminal according to one aspect of the present disclosure includes a receiving section that receives one downlink control information used for scheduling of transmission of one or more uplink shared channels using a first frequency resource and a second frequency resource, the first resource corresponding to a first beam or panel, and the second frequency resource corresponding to a second beam or panel and being frequency-division multiplexed with the first frequency domain resource, and a control section that determines the first frequency resource and the second frequency resource, based on the downlink control information.

The invention relates to the technical field of optical fiber communication and sensing, and discloses an optical fiber coding and positioning integrated sensing device based on frequency division multiplexing and an application method, and the optical fiber coding and positioning integrated sensing device comprises a light source module, a coupler module, a frequency division multiplexing module, a sensing optical fiber network, a signal demodulation module, a positioning sensing module and a main control unit. According to the optical fiber coding and positioning integrated sensing device based on frequency division multiplexing and the application method thereof, a light source module generates broadband continuous optical signals, a coupler module realizes optical signal coupling and separation, a frequency division multiplexing module integrates sub optical signals, and an optical fiber sensing unit of a sensing optical fiber network senses and encodes external physical quantities. The positioning sensing module realizes accurate positioning, the signal demodulation module separates sub optical signals and extracts information, the main control unit operates in a coordinated manner, processes and analyzes data and outputs a result, all the modules cooperate to form an efficient and stable monitoring system, the requirements for multi-physical-quantity synchronous monitoring and accurate position positioning in a large-scale and long-distance scene are met, and the system performance is improved.

The present disclosure relates to a communication technique that merges IoT technology with a 5G communication system for supporting higher data transmission rates than 4G systems, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. A method for a transmitter of a communication system according to the present disclosure is characterized by: transmitting configuration information for signal transmission to a receiver, checking resources for the signal transmission; transmitting scheduling information indicating the resources to the receiver; converting a transmission signal to a compressed signal so as to correspond to the configuration information; spreading the compressed signal to multiple dimensions; mapping a portion of the spread compressed signal to the resources corresponding to the scheduling information; converting the spread compressed signal to generate an orthogonal frequency-division multiplexing (OFDM) signal; and transmitting the generated OFDM signal to the receiver.

The invention discloses a communication method and device, relates to the technical field of communication, and can enable a split 20MHz discrete bandwidth to accord with a frequency spectrum template of a bandwidth greater than 20MHz, thereby improving the communication performance when scheduling and transmitting a distributed resource unit (DRU) in the bandwidth greater than 20MHz based on the 20MHz discrete bandwidth. The method comprises the following steps: transmitting an orthogonal frequency division multiplexing (OFDM) symbol through a DRU in a 20MHz discrete bandwidth in a first bandwidth; the subcarrier index of the DRU in the 20MHz discrete bandwidth is the subcarrier index of the DRU in the 20MHz bandwidth plus a-x, a is the number of protection subcarriers on the first side of the first bandwidth, and x is the number of protection subcarriers on the first side of the 20MHz bandwidth; or, the subcarrier index of the DRU in the 20MHz discrete bandwidth is obtained by subtracting b-y from the subcarrier index of the DRU in the 20MHz bandwidth, b is the number of the protection subcarriers on the second side of the first bandwidth, and y is the number of the protection subcarriers on the second side of the 20MHz bandwidth; a, x, b and y are all positive integers. The method is suitable for a wireless local area network supporting related standards of electrical and electronic engineer learning.

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 user equipment (UE) is configured to establish a connection to a fifth generation (5G) new radio (NR) network, wherein the connection is configured to utilize cyclic prefix (CP)-orthogonal frequency division multiplexing (OFDM) waveform and demodulation reference signal (DMRS) type 1, receive a DMRS port indication configured to indicate one or more DMRS ports assigned to the UE, wherein single symbol DMRS type 1 is configured to support up to eight DMRS ports and two symbol DMRS type 1 is configured to support up to sixteen DMRS ports and perform a transmission operation or a reception operation using the one or more DMRS ports assigned to the UE.

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.

Various aspects of the present disclosure relate to a device and methods for a network-controlled repeater (NCR) device to efficiently expand a coverage area of a base station. The repeater device transmits to base station(s) a beam designation of beams of the repeater device capable of communicating with user devices via a third access link. In response, the base station(s) determining that the beam designation identifies two or more user devices in a first beam of the two or more beams that should be serviced using frequency division multiplexing. The base station(s) transmits a configuration to the repeater device for transmission of a downlink and reception of an uplink on the third link between the repeater device and the two or more user devices using the first beam.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit uplink signaling via a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) waveform. A configured resource muting pattern may be based on or may reuse a phase tracking reference signal (PTRS) frequency pattern. The resource muting pattern may mute every other resource element (RE) of an uplink symbol or uplink subband of subband full duplex (SBFD) symbols, and the transmitting UE may perform uplink rate matching (e.g., applying a zero power PTRS pattern and inserting the zero power REs after a DFT spread operation, oversampling after a DFT-s-OFDM procedure and doubling a size of an IFFT, or repeating an input sequence to a DFT and doubling a size of the IFFT, power boosting, updating a power control calculation, etc.).

The invention discloses an orthogonal frequency division multiplexing transmission method and system based on probability shaping. The method comprises the following steps: grouping constellation points according to transmitting power to obtain a symbol mode; constructing a mapping relation between index bits and modulation strategies according to a set mapping probability to obtain the mode distribution table; the method comprises the following steps: dividing an input original bit into an index bit sequence and a data bit sequence, querying a preset mode allocation table according to the index bit sequence to obtain a modulation strategy, and performing constellation mapping on the data bit according to the modulation strategy to generate a constellation point; mapping the constellation points to a subcarrier to generate an orthogonal frequency division multiplexing symbol block; converting the orthogonal frequency division multiplexing symbol block into a transmission signal; in response to the received transmission signal, the transmission signal is recovered to obtain the original bit, probability shaping is performed on the constellation points in the constellation diagram, so that a high-power symbol is allocated with fewer subcarriers, and the bit error rate in the communication transmission process is improved.

Methods, systems, and devices for wireless communications are described. Energy harvesting (EH) -capable devices may be assigned to a group for the purpose of multiplexed (e.g., frequency division multiplexed (FDM) or time division multiplexed (TDM) ) transmissions, and the communication resources (e.g., time and / or frequency resources) specific to the EH-capable devices in a multiplexed transmission may be identified based on IDs associated with the EH-capable devices within the group. For example, the various communication resources may correspond to different IDs within the group, and the EH-capable devices within a group may each be assigned an ID within the group. A network device in communication with a group of EH-capable devices may avoid the forward link overhead associated with individual assignment of communication resources to each EH-capable device for multiplexed transmissions to the group of EH-capable devices via mapping of communication resources to IDs within the group.

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.

The invention discloses a space-time-frequency resource multiplexing transmission opportunity sharing method for coordinating multiple satellite flash access points, and belongs to the technical field of high-density deployment of multiple satellite flashes. The method comprises the following steps: acquiring channel state information (CSI) and beam direction parameters of the STA in a specified micro time slot; constructing a dynamic coordination group mechanism to obtain a dynamic coordination group member list and optimized beam forming parameters; constructing a fusion framework of frequency division multiplexing and space division multiplexing; and adopting adaptive resource scheduling to obtain an AP-STA link scheduling scheme and the transmission rate of each link. Through the dynamic coordination group construction and beam forming technology, dynamic compatible group division among a plurality of star flash access points is realized, the same frequency interference is reduced by more than 30%, the number of concurrent connections is increased, and the SINR of a transmission link in a high-density scene is ensured to always meet the service requirements; meanwhile, combined scheduling of TDD time-division dual-time slots and spectrum resources is realized through an enhanced resource allocation frame, and multi-AP concurrent transmission in a single time slot is realized in a single-Hertz frequency band.

DFT spreading is applied to a sequence of symbols to generate a DFT-spread sequence of symbols. The DFT-spread sequence of symbols is frequency-division multiplexed with a reference signal sequence to generate a multiplexed sequence, and the DFT-spread sequence of symbols and the reference signal sequence are recoverable from demultiplexing the multiplexed sequence. Further processing, such as a transform to convert to time domain and / or spectral shaping, may be applied in some embodiments. The symbols may be modulation symbols to which data bits are mapped, in binary phase-shift keying (BPSK) modulation, pi / 2-BPSK modulation, quadrature phase-shift keying (QPSK) modulation, quadrature amplitude modulation (QAM) or offset-QAM (OQAM), for example. Embodiments may be applied in conjunction with any of different types of reference signals, such as a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), or a channel state information reference signal (CSI-RS), or different types of reference signal sequences.

The embodiment of the invention relates to the technical field of optical fiber link loss monitoring, and provides an optical fiber link loss monitoring method and system, electronic equipment and a medium, and the method comprises the steps: dividing continuous light outputted by a laser into upper path signal light and lower path local oscillation light; modulating the upper signal light into a frequency division multiplexing probe light pulse sequence with a plurality of frequency components, and amplifying the frequency division multiplexing probe light pulse sequence to a preset light power level; injecting the frequency division multiplexing probe light pulse sequence after optical power amplification into a to-be-monitored optical fiber, and obtaining backward Rayleigh scattering light reflected by the to-be-monitored optical fiber; performing light interference processing on the down-path local oscillation light and the backward Rayleigh scattering light to obtain interference light, and converting the interference light into a target electric signal; performing signal processing on the target electric signal to obtain a loss distribution curve of the to-be-monitored optical fiber; and performing optical fiber link loss monitoring on the to-be-monitored optical fiber through the loss distribution curve. Therefore, low-cost and accurate loss monitoring of the optical fiber link is realized.

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 present invention relates to the field of wireless communications, and in particular to a method for adaptively configuring subcarriers and subsymbols in underwater acoustic generalized frequency division multiplexing communications. The purpose of the present invention is to solve the problem that the inter-carrier interference and inter-symbol interference of the GFDM system in underwater acoustic communications are too high due to the multipath effect, resulting in low accuracy of channel estimation and low communication quality. After selecting the optimal configuration, the method of the present invention can significantly improve the performance of the GFDM communication system in the underwater acoustic channel. By accurately analyzing and calculating the energy of inter-subcarrier interference and inter-subsymbol interference, the optimal configuration scheme based on minimizing interference energy is selected. This scheme not only makes full use of the flexible data block structure of GFDM, but also combines interference elimination technology to enable the system to perform better in the underwater acoustic multipath channel, thereby improving the accuracy of channel estimation and communication quality.

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.