501 results about "Frequency division multiplexed" patented technology

The invention provides a frequency division multiplexing multi-beam anti-interference method for a shaped antenna, and the method comprises the steps: obtaining the signal data of each frequency band according to the multi-beam spatial domain data received by the shaped antenna and a filter of a frequency domain corresponding to the working frequency band of each beam; performing high-resolution spatial spectrum estimation on the signal data of each frequency band by adopting a MUSIC algorithm to obtain an incoming wave space direction of an interference signal; according to the incoming wave space direction of the interference signal, on the basis of a preset multi-beam zeroing anti-interference strategy, self-adaptive weights of all same-frequency beams are obtained in a spatial domain and frequency domain two-dimensional combined processing mode; the adaptive weights of the same-frequency beams are combined, a comprehensive directional diagram is obtained, and a multi-beam interference zeroing result is obtained, according to the method, the whole airspace is covered with the beams of different frequency points, and space-frequency combined suppression of airspace complex interference is achieved.

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.

Various aspects of the present disclosure relate to a UE that receives a resource allocation for wireless communication associated with using at least two antennas of the UE, and the wireless communication includes a respective signal associated with each respective antenna of the two antennas. The UE can multiplex a set of modulation symbols associated with the two antennas based on a cyclic-prefix orthogonal frequency-domain multiplex operation. The UE can then transmit the respective signal associated with each respective antenna of the two antennas based on the multiplexing, where a delay of a first signal associated with a first antenna relative to a second signal associated with a second antenna is based on the resource allocation for the wireless communication.

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 a multi-channel analog-to-digital converter for multi-channel frequency division multiplexing and a conversion circuit and method thereof, and the frequency division multiplexing multi-channel analog-to-digital conversion circuit comprises an analog frequency conversion module which is used for receiving N paths of modulation clock signals, and generating N paths of modulation clock signals according to the modulation clock signals, n paths of input signals are modulated to preset frequencies of the input signals respectively, and N paths of modulation signals are obtained; wherein N is greater than or equal to 2, and N is a positive integer; the frequency bands where the N paths of modulation signals are located are not overlapped; the analog adder is used for combining the N paths of modulation signals to obtain one path of analog signal; the input end of the analog-digital conversion module is connected with the analog-digital conversion module; the digital logic control module is used for receiving the N paths of modulation clock signals and separating the digital signals into N paths of digital signals which are output in parallel. Multi-channel analog-to-digital conversion can be realized by adopting one analog-to-digital converter, the hardware volume, cost and power consumption can be reduced, and the analog-to-digital conversion rate and precision can be improved.

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.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects. a user equipment (UE) may receive a configuration that configures the UE for type 1 or type 2 configured grant physical uplink shared channel (CG-PUSCH) communications for multiple transmit receive points. The UE may transmit frequency division multiplexed or spatial division multiplexed PUSCH transmissions based at least in part on the configuration. Numerous other aspects are described.

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 present invention relates to the technical field of optical fiber sensing, and particularly relates to an optical time-domain reflectometer, and a method for eliminating interference fading. The optical time-domain reflectometer comprises: a laser device, a frequency-division multiplexing modulator, a circulator and a signal processing apparatus, wherein the frequency-division multiplexing modulator comprises a first modulator, a second modulator, a first attenuator and a second attenuator; the laser device is used for generating a coherent light source, and the coherent light source sequentially passes through the first modulator and the first attenuator, so as to obtain a first pulsed light signal; the coherent light source sequentially passes through the first modulator and the second modulator, so as to obtain a second pulsed light signal; and the coherent light source sequentially passes through the second attenuator and the second modulator, so as to obtain a third pulsed light signal. Therefore, by means of different combinations of the first modulator, the second modulator, the first attenuator and the second attenuator, multiple pulsed light signals can be outputted; and compared with the prior art, hardware costs are saved.

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 discloses a communication method, device and system and a storage medium. A first resource position where the first node sends the first signal and a second resource position where the second node sends the second signal are subjected to time division multiplexing and / or frequency division multiplexing, the first resource position is associated with an identifier of the first node, and the second resource position is associated with an identifier of the second node; rapid measurement of multiple nodes can be realized, and interference between signals is avoided. The scheme can be applied to scenes such as an ad hoc network and a communication emergency network.

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 invention discloses a random pre-coding multiple-input multiple-output orthogonal frequency division multiplexing wireless communication method and system, a transmitting end enables each symbol to fully utilize all sub-channels through random unitary transformation and random compression transformation, and at a receiving end, by means of a block diagonal channel matrix of MIMO-OFDM on a frequency domain, all sub-channels of the MIMO-OFDM are fully utilized, so that the random pre-coding multiple-input multiple-output orthogonal frequency division multiplexing wireless communication is realized. A cross-domain orthogonal approximate information transfer (CD-OAMP) detector is designed, which can perform signal detection with extremely low complexity, and can be optimal for replica maximum posteriori (MAP). The RP-MIMO-OFDM performance of the CD-OAMP detector exceeds the performance of MIMO-OFDM, the performance of MIMO-OTFS and the performance of MIMO-AFDM, the performance of RP-MIMO-OFDM is close to the performance of MIMO-IFDM, and the complexity is lower.

Certain aspects of the present disclosure provide techniques for method for wireless communications by a user equipment (UE) generally including receiving a plurality of code blocks (CBs) from a network in one or more orthogonal frequency division multiplexed (OFDM) symbols and decoding the CBs using an iterative process performed on each OFDM symbol, wherein the iterative process involves data aided channel estimation and each iteration of the process involves demodulation and decoding.

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.

A network controlled repeater includes: forwarding processor circuitry; and communicating processor circuitry configured to: transmit capability information for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms to a network device, and receive control information from the network device via a control link, wherein the network controlled repeater supports cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms for uplink and downlink, an uplink modulation scheme and a downlink modulation scheme; and the forwarding processor circuitry is further configured to perform forwarding at a backhaul link and / or an access link according to the control information.

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.

The present application relates to the technical field of communications, and discloses a transmission method, a terminal, and a network side device. The transmission method in the embodiments of the present application comprises: a terminal determines a transmission mode for one or at least two transmission objects, wherein the transmission mode comprises using the same or different modes for transmission, or the transmission mode is associated with at least one of the waveform, initialization parameters, scrambling mode, sequence, phase or rotation phase used when using the same or different modes for transmission, the transmission object comprises a signal or a channel or a part of the signal or a part of the channel, and the at least two transmission objects are transmitted by means of frequency division multiplexing (FDM) or in the form of a discrete frequency domain; and the terminal transmits the one or at least two transmission objects on the basis of the transmission mode.

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 belongs to the field of gas detection and measurement, and discloses a multi-component gas detection system and method based on vmd self-adaptive frequency division, the system innovatively combines a frequency division multiplexing technology and a variational mode decomposition (VMD) algorithm, and realizes high-precision detection of multi-component gas. A digital signal carrying multi-component gas concentration information is obtained through a data acquisition card, a complex signal is subjected to self-adaptive decomposition by using a VMD algorithm, and a characteristic absorption signal of the multi-component gas is effectively separated. According to the method, the modal parameters of the VMD are iteratively optimized by adopting a k optimization algorithm, the accurate distinguishing of overlapped absorption spectral lines is realized by increasing the modal density, the analysis capability of a dense spectrum is improved, and the interference of interference noise and electronic noise is remarkably reduced. Second harmonic signals are extracted through software demodulation, and gas concentration information is inverted according to the second harmonic signals. Experiments show that compared with a traditional frequency division multiplexing scheme, the method has the advantages that the detection precision is improved, and the method is particularly suitable for synchronous detection of multi-component trace gas under a complex background.

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.