27 results about "Frequency-division multiplexing" patented technology

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.

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 application discloses a semantic communication method and system based on interleaved frequency division multiplexing, belongs to the field of semantic communication, and is applied to a semantic communication system. The method comprises the following steps: a sending end extracts semantic information through a semantic encoder and transmits the semantic information after modulation through interleaved frequency division multiplexing; a receiving end reconstructs a semantic signal based on a received signal through a cross-domain iterative detector and completes a target task through a semantic decoder. The cross-domain iterative detector performs linear detection in a time domain by utilizing channel sparsity, performs nonlinear detection in a characteristic domain based on a fractional model, and realizes cross-domain transformation through an interleaved frequency division multiplexing modulation matrix with universal characteristics. The application can realize training of an encoder / decoder and decoupling of a channel through interleaved frequency division multiplexing modulation, the channel has strong universality, and the compatibility with an existing digital communication system is good. Since the type of the encoder / decoder is not limited, the whole system can perform multiple tasks, and the task universality is good.

The application discloses a target channel selection output method and system for frequency division multiplexing superconducting detectors, and belongs to the technical field of digital signal processing and superconducting detector readout electronics. The method aims at the problems of high resolution channelization resource occupation, high full spectrum output bandwidth pressure, and obvious spectrum leakage and crosstalk under high multiplexing ratio. On the basis of high resolution channelization processing, the mapping relationship between target frequency points and channels and the target channel selection output mechanism are introduced. After the wideband digital input signal is processed by the polyphase filter bank channelization, only the complex data corresponding to the target frequency points containing effective signals are selected and output, and are further separated into I / Q data stream output. The scheme combines high resolution channelization processing with the mapping driven selection output mechanism, reduces resource occupation and data transmission bandwidth while ensuring frequency resolution, and improves real-time performance and signal fidelity in the readout scene of high multiplexing ratio detectors.

The application discloses a kind of based on thermo-optic effect's silicon optical chip and the active alignment packaging method and system of optical fiber array, it is related to optoelectronic chip packaging test technical field, method is by setting up the monitoring unit containing asymmetric double micro-ring resonator in silicon optical chip I / O channel side, it is equipped with the localized thermal elastic microcavity executor of banding suspension film structure;After machine vision rough alignment, using frequency division multiplexing monitoring signal, the global coupling region is determined by six-axis displacement platform scanning, and then driving thermal elastic microcavity executor realizes fine alignment, and after solidification, alignment state is maintained by in-situ monitoring and dynamic compensation, system contains silicon optical chip, optical fiber array, frequency division multiplexing light source, detection array, six-axis displacement platform and control unit, the application combines thermal elastic and thermo-optic effect, improves alignment precision and stability, and is suitable for high-precision coupling packaging scene.

This invention proposes a b-modulation nonlinear frequency division multiplexing system based on Gaussian mixture clustering, belonging to the field of optical fiber communication system technology. It creatively applies the Gaussian mixture clustering algorithm to the b-modulation nonlinear frequency division multiplexing system, replacing the original hard decision and soft decision algorithms of the b-modulation nonlinear frequency division multiplexing system, to equalize the phase rotation of the received constellation diagram caused by noise, thereby eliminating the influence of spontaneous emission noise from the EDFA amplifier and various adverse factors in the optical fiber channel. At the same time, it performs clustering decision on the demodulated 16QAM constellation diagram data, reducing the bit error rate of the system and improving the system performance.

Various aspects of the present disclosure relate to an enhanced synchronization signal (SS) block structure or design for 6G radio access technologies and other access technologies. The SS block structures may enable the transmission of physical broadcast channel (PBCH) signals at periodicities different than, unique to, or separate from periodicities of SS bursts, such as SS bursts that comprise multiple synchronization signal (SS) blocks. For example, the synchronization signal block structures may decouple the PBCH (and / or other channels) from the SS, facilitating time division multiplexing and / or frequency division multiplexing of the PBCH with respect to the synchronization signals of the SS block.

A TFDM-PON system correction method and device, including OLT receiving ONU based on time division multiplexing or time-frequency division multiplexing sends double polarization signal, it includes target signal sequence corresponding with X / Y polarization, and target signal sequence is IQ period complex signal and its I road and Q road are single tone signal of first frequency and second frequency respectively;Based on the Fourier transform of double polarization signal and frequency domain symmetry, calculate target parameters including target transceiver frequency offset, target transmitting terminal, receiving terminal IQ delay and target power deviation between each ONU, make ONU correct frequency, delay and power according to target parameters, eliminate subcarrier crosstalk caused by frequency offset in TFDM uplink burst transmission, image crosstalk caused by IQ imbalance and performance degradation caused by subcarrier power imbalance, reduce bit error rate, improve system robustness.

Methods, systems, and apparatus for wireless communication are described. The techniques described herein relate to Frequency Division Multiplexing (FDM) of a Demodulation Reference Signal (DMRS). A User Equipment (UE) receives control signaling including configuration for uplink control messages. The UE generates uplink control messages based on the configuration and a first uplink control message format from multiple formats. The uplink control message includes a DMRS in FDM with uplink control information (UCI). The first uplink control message format is associated with a Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform and the number of four or more OFDM symbols. The UE uses the DFT-s-OFDM waveform to transmit the uplink control messages.

Various aspects of the present disclosure relate to an enhanced synchronization signal (SS) block structure or design for 6G radio access technologies and other access technologies. The SS block structures may enable the transmission of physical broadcast channel (PBCH) signals at periodicities different than, unique to, or separate from periodicities of SS bursts, such as SS bursts that comprise multiple synchronization signal (SS) blocks. For example, the synchronization signal block structures may decouple the PBCH (and / or other channels) from the SS, facilitating time division multiplexing and / or frequency division multiplexing of the PBCH with respect to the synchronization signals of the SS block.

The application discloses an affine frequency division multiplexing modulation and demodulation method, device, system, medium and product, the affine frequency division multiplexing modulation transmitting method comprises the following steps: obtaining a target frequency domain signal to be transmitted, and calculating two chirp matrices based on two chirp parameters; the target frequency domain signal is multiplied in parallel by the conjugate matrix of the second chirp matrix to obtain a target rotating frequency domain signal; the signal is inversely discrete fourier transformed to obtain a first target time domain signal; the first target time domain signal is secondly phase-rotated based on the conjugate matrix of the first chirp matrix to obtain a second target time domain signal; the target time domain signal is preprocessed before transmission to generate a target time domain transmitting signal and perform radio frequency transmission, and the technical scheme of the embodiment of the application can effectively solve the performance bottleneck problems, such as Doppler frequency shift sensitivity and weak anti-interference ability, of the orthogonal frequency division multiplexing technology in the high-speed mobile scene.

This invention relates to the field of Internet of Things (IoT) and communication sensing technology for medical devices, and particularly to a centralized management method and system for anesthesia equipment based on IoT. The method includes the following steps: S1: Frequency division multiplexing of high-frequency communication and low-frequency acoustic envelopes to control the array to transmit a composite optical signal; S2: Identifying the end-expiratory phase based on mechanical vibration rhythm to generate a timing gating; S3: Responding to the gating to open the photoacoustic resonant cavity to receive the optical signal; S4: Filtering and separating demodulated data and photoacoustic pressure, extracting base station coordinates and inverting leakage concentration; S5: Optimizing beamforming based on pressure amplitude and bit error rate, and generating a ledger by combining coordinates and concentration. In this invention, by frequency division multiplexing and fusing the high-frequency communication envelope and the low-frequency acoustic excitation envelope, and utilizing a light-emitting diode array to simultaneously achieve downlink communication and photoacoustic sensing excitation, the problem of electromagnetic interference easily caused by traditional RF IoT solutions in the operating room environment is solved.

The application discloses a method for analyzing bit error rate performance in a space modulation assisted affine frequency division multiplexing system; in the space modulation mode, information bits are mapped into constellation symbols and indexes of activated antennas, the system experiences a time-frequency double selective channel after affine frequency division multiplexing modulation, linear minimum mean square error equalization is performed on the affine Fourier transform domain received signal after affine frequency division multiplexing demodulation at the receiving end, then the equalized signal is grouped, maximum likelihood detection is performed on each carrier symbol to obtain estimated symbols and activated antenna indexes, and the estimated symbols and activated antenna indexes are demapped into bits; theoretical approximate closed expressions of error probabilities of transmitting symbol detection and activated antenna index detection are derived respectively, and the average bit error rate of the system is obtained; through simulation verification, the performance analysis method provided by the application can effectively measure the average bit error rate performance of the system.

This invention discloses a terahertz receiver and a focal plane camera device based on a variable capacitor. The receiver includes a connected zigzag inductor and interdigitated capacitors; each finger of the interdigitated capacitor is composed of closely arranged double-cross-shaped repeating units, enabling it to efficiently absorb terahertz waves without the need for an additional absorber. Terahertz radiation changes the dielectric constant of the dielectric, causing changes in capacitance and resonant frequency; detection is achieved by detecting these changes. The focal plane camera device includes an array of the aforementioned receivers. Each receiver is coupled to a zigzag-shaped center feed line via a coupling feed line, and each unit has a different resonant frequency, achieving frequency division multiplexing readout. This invention combines absorption and resonance functions into one, greatly simplifying the structure, achieving high absorption efficiency, possessing dual polarization and intrinsic frequency division multiplexing capabilities, and easily expanding into large arrays. It can be widely applied in fields such as high-sensitivity terahertz passive imaging and spectral analysis.

A reduced capability (redcap) device can perform an initial uplink communication including transmitting a redcap physical uplink control channel (R-PUCCH) on an initial uplink bandwidth part (BWP) shared with a second device, the initial uplink BWP having a bandwidth (BW) that is greater than a maximum BW supported by the redcap device and less than or equal to a maximum BW supported by the second device. Frequency hopping operation of the redcap device can be supported to make the R-PUCCH transmission by a resource set for frequency division multiplexing and / or time division multiplexing of the R-PUCCH transmission and a PUCCH transmission by the second device. When a frequency gap is greater than the maximum BW supported by the redcap device, a restriction can be implemented to create a gap for the redcap device to perform RF retuning between a physical RACH transmission and a subsequent physical control channel (e.g., PDCCH) monitoring for random access reception.

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.

Various aspects of the present disclosure relate to an enhanced synchronization signal (SS) block structure or design for 6G radio access technologies and other access technologies. The SS block structures may enable the transmission of physical broadcast channel (PBCH) signals at periodicities different than, unique to, or separate from periodicities of SS bursts, such as SS bursts that comprise multiple synchronization signal (SS) blocks. For example, the synchronization signal block structures may decouple the PBCH (and / or other channels) from the SS, facilitating time division multiplexing and / or frequency division multiplexing of the PBCH with respect to the synchronization signals of the SS block.

The application relates to a frequency division multiplexing ultrahigh frequency RFID label, and relates to the technical field of the frequency division multiplexing ultrahigh frequency RFID label. The application comprises a general basic radiation module configured to work in a predetermined wide frequency band; the general basic radiation module comprises a replaceable frequency point tuning module which is detachably electrically connected to the general basic radiation module; and a standardized interface formed between the two; the replaceable frequency point tuning module is coupled with the general basic radiation module through the standardized interface, and is used for tuning the overall resonance frequency of a resonance unit to a target discrete frequency. The application realizes flexible and accurate configuration of the resonance frequency by modularizing separation of the wideband radiator and the narrowband tuner and designing a standardized coupling interface; meanwhile, the production supply chain is greatly simplified, the material and management costs of the multi-frequency point product are reduced, and the miniaturization of the overall structure is promoted.

The application discloses a multi-port frequency division multiplexing filter, comprising: one or more than one frequency selection filter module, each of which is provided with one input port and one or more than one output port; each of the frequency selection filter modules comprises one or more than one coupling module and one or more than one resonant cavity with different frequencies; the coupling module is used for coupling a frequency signal input through the input port to the resonant cavity with different frequencies; and the resonant cavity is used for completing selective transmission of the corresponding frequency signal and outputting from the corresponding output port. The embodiment of the application realizes the single-cavity band-pass filtering function of adjustable frequency bands. Not only can the problem of XY control line port multiplexing in the field of superconducting quantum computing be solved, but also the multi-section frequency division multiplexing function in other application fields can be realized, which has great significance for promoting the large-scale expansion of quantum processors.

Various aspects of the present disclosure relate to an enhanced synchronization signal (SS) block structure or design for 6G radio access technologies and other access technologies. The SS block structures may enable the transmission of physical broadcast channel (PBCH) signals at periodicities different than, unique to, or separate from periodicities of SS bursts, such as SS bursts that comprise multiple synchronization signal (SS) blocks. For example, the synchronization signal block structures may decouple the PBCH (and / or other channels) from the SS, facilitating time division multiplexing and / or frequency division multiplexing of the PBCH with respect to the synchronization signals of the SS block.

This disclosure relates to the field of oil and gas extraction technology, and in particular to a DC power line carrier communication method, apparatus, measurement and control equipment, and medium, which can solve the problems of synchronous transmission and reception in half-duplex communication and the complexity and redundancy of full-duplex schemes. The method includes selecting at least one of a first communication frequency band and a second communication frequency band to complete data transmission according to data transmission requirements, wherein the first and second communication frequency bands are mutually isolated; in the first communication frequency band, a first mixed signal is received, and a first carrier signal is isolated from the first mixed signal for parsing to obtain control commands; in the second communication frequency band, a second carrier signal characterizing downhole physical feature data is superimposed on the DC power supply base component and encoded to generate a second mixed signal for transmission. By achieving full-duplex communication through frequency division multiplexing, downhole equipment can simultaneously receive control commands and transmit monitoring data, solving the latency problem of half-duplex communication.

This invention discloses a frequency division multiplexer based on the propagation characteristics of magnetostatic waves in a magnetic double-layer thin film, relating to the field of microwave magnetic signal processing technology. Two magnetic thin films, FM1 and FM2, made of different materials, are stacked vertically. These two materials have different thicknesses, different saturation magnetizations, and different damping coefficients. Using one input metal line and two output metal lines as microstrip transmission lines, the input signal enters the middle metal line as a microwave current. Magnetostatic waves of different frequencies propagate along the left and right sides respectively. These different frequency magnetostatic waves are converted into microwave signals of corresponding frequencies on the left and right metal lines, thus achieving frequency division. This invention can achieve the propagation of magnetostatic wave signals at different frequencies along different directions without additional modulation or asymmetric structures, thereby completing frequency division multiplexing.

This invention discloses a Bluetooth audio transmitting device, receiving device, related methods, and system, relating to the field of wireless communication technology, to solve the problem of low transmission rate of Bluetooth audio data. The Bluetooth audio transmitting device includes: a processing unit, N modulation units, a combining unit, a transmitting unit, a receiving unit, and an antenna assembly. The antenna assembly includes a switching unit and an antenna. When the antenna is in a first state, it is connected to the transmitting unit and used to transmit a first radio frequency signal within the transmission time slot of the current isochronous communication interval, thereby transmitting a corresponding set of audio data packets to N Bluetooth audio receiving devices in a frequency division multiplexing manner. When the antenna is in a second state, it is connected to the receiving unit and used to receive a second radio frequency signal on N target links in a time-division multiplexing manner within the reception time slot of the current isochronous communication interval, so as to receive acknowledgment data packets sent by N Bluetooth audio receiving devices respectively. Embodiments of this invention can improve the transmission rate of audio data.

This invention discloses a single-pixel edge imaging system and method based on quantum state encoding. The system includes modules for illumination pattern generation, single-pixel detection and data acquisition, and edge image reconstruction. The core scheme is as follows: the illumination pattern generation module generates a spatiotemporally coupled light field, the spatial distribution of which is a convolution kernel of the edge detection operator, and the temporal dimension follows an orthogonal eigenmode sequence generated by the Sturm-Liouville operator. This light field interacts with the object to achieve parallel encoding of edge information. The detection module acquires temporal bucket signals, and the reconstruction module directly demodulates and images based on orthogonality. This invention combines quantum state orthogonality with temporal frequency division multiplexing, effectively suppressing noise under strong scattering, significantly reducing data redundancy, and achieving direct edge imaging with high signal-to-noise ratio and low latency, breaking through the dependence on spatial array sampling.

This invention provides a system, method, and medium for frequency division multiplexing of classical and quantum signals, including a transmitter signal generation and modulation module and a receiver signal detection module. The transmitter signal generation and modulation module includes an arbitrary waveform transmitter, a laser transmitter, an IQ modulator, a variable optical attenuator, an optical beam splitter, and an optical isolator. The receiver signal detection module includes two homodyne detectors, a variable optical attenuator, an optical isolator, and an optical beam splitter. This invention generates a composite optical signal by the transmitter signal generation and modulation module, which is a mixture of a classical signal modulated by quadrature phase shift keying (QPSK) and a quantum signal modulated by Gaussian coherent state. The receiver signal detection module detects the composite signal, and then performs coherent demodulation, filtering, phase drift recovery, balance compensation, and parameter evaluation. This achieves frequency division multiplexing of classical and quantum signals in the frequency domain, realizing frequency division multiplexing of classical and quantum signals on the same channel.

This document describes a technique and system for frequency division multiplexing (FDM) using a polyphase shifter. A radar system may include a transmitter, a receiver, a polyphase shifter, and a processor. The transmitter transmits electromagnetic (EM) signals in an FDM scheme, and the receiver detects the EM signals reflected by an object. The received EM signals comprise multiple channels. The processor controls the polyphase shifter to introduce a phase shift into the EM signals. The processor can also divide the Doppler spectrum of the received EM signals into multiple sectors representing corresponding frequency ranges. Each channel is associated with a corresponding sector. The processor can use incoherent integration across sectors to determine potential detections of objects, including aliasing detections and actual detections. The processor can then determine the actual detection. In this way, the described FDM technique using a polyphase shifter can resolve Doppler ambiguity in the received EM signals.