26 results about "Rate modulation" patented technology

The invention discloses a ranging communication fusion miniaturized system and method based on single photon detection. The system adopts a time division multiplexing common-path structure, and a ranging pulse sequence and a communication pulse sequence are sequentially transmitted in the same detection period to form a PPM modulation laser pulse chain. A single-photon detector is adopted to receive signals, background light interference is suppressed by combining a narrow-band filter and a time gating technology, and the type and boundary of a pulse sequence are identified through a signal demodulation and discrimination module. When the distance measurement pulse sequence is identified, the distance measurement path realizes distance measurement based on the round-trip time of the distance measurement pulse in the period; when a communication pulse sequence is identified, the communication path demodulates the PPM communication data. The method effectively decouples the contradiction between the distance measurement fuzzy and the communication rate, supports communication pulse high repetition frequency modulation while realizing non-fuzzy distance measurement, improves the distance measurement precision and the communication rate, and is suitable for free space communication, mobile robot platforms and other application scenes.

The present disclosure provides a wake-up signal processing method. The method includes: a network device modulating a first wake-up signal with a low-rate modulation scheme to obtain a low-rate wake-up signal, superimposing the low-rate wake-up signal with an OFDM signal to obtain a superimposed signal, and transmitting the superimposed signal to a terminal device.

The present disclosure relates to a wireless communication system. Specifically, the present disclosure relates to a device and method for supporting modulation symbols at a high chip rate for ambient Internet of Things (Ambient IoT) communication in a wireless communication system.

A communications system may include a user equipment (UE) device that communicates with a wireless network. The UE device may transmit a signal to the wireless network identifying a peak data rate of a modem on the UE device, a balanced data rate of the modem, and a buffer size of the modem. The UE device may receive downlink data from the wireless network and may store the downlink data at buffer circuitry on the modem. The UE device may perform delayed processing of the downlink data across slots in a manner that allows for a reduction in size of the modem.

The invention discloses a high-speed modulation and demodulation method for a dynamic underwater acoustic network, and the method also employs an orthogonal sequence multiplexing modulation and demodulation technology based on a Zadoff-Chu (ZC) sequence, and combines the setting of a cyclic displacement interval to construct a plurality of sub-channels, thereby achieving the multi-path separation, and reducing the average transmitting power of a system at the same time. In the aspect of multi-user access, interference among multiple users is regarded as additive white noise by using quasi-orthogonal characteristics among different ZC root sequences, so that uncoordinated random concurrent access is supported; differential modulation between sub-channels in a symbol is adopted, and the requirement for phase tracking is lowered; and a receiving end converts multipath amplitude information into soft decision information through cyclic correlation spectrum calculation and multipath diversity technologies, so that the calculation complexity is reduced, and the throughput of the time-varying underwater acoustic system is improved while the multi-user access efficiency is improved.

The embodiment of the present invention discloses a rate modulation method, device, equipment and storage medium on a link. The method includes: obtaining the current signal-to-noise ratio of the received signal frame, judging whether the current signal-to-noise ratio meets the preset first rate switching condition; if not, determining the current rate and adjacent rate of the signal frame in the link, and determining the current frame loss rate at the current rate and the adjacent frame loss rate at the adjacent rate according to the detection frames sent at the current rate and the adjacent rate; judging whether the current frame loss rate, the adjacent frame loss rate and the current rate meet the preset second rate switching condition; if so, adjusting the current rate to the adjacent rate to complete the rate modulation on the link. Automatic adjustment of the rate is achieved, and the efficiency and accuracy of the rate adjustment are improved through the preset judgment conditions.

The invention relates to the technical field of metasurface electro-optical devices, in particular to a low-loss mid-infrared electro-optical modulator based on graphene and ITO and a preparation method thereof, SiO2, Al2O3, graphene, TiO2 and ITO are sequentially arranged in the electro-optical modulator from bottom to top, and Si is embedded in SiO2 to serve as a central waveguide. Single-layer graphene and ITO with the thickness of 30 nm are placed in a staggered mode to form a heterojunction, change of carriers in the Si waveguide is caused, and then modulation of the change of effective refraction in the Si waveguide is achieved; besides, the graphene and the ITO form a parallel-plate capacitor, the switching energy of the modulator is reduced, high modulation efficiency is achieved, and finally, metal electrodes are placed on the graphene and the ITO respectively, so that voltage directly controls heterojunction. According to experimental verification, a high extinction ratio is achieved under low insertion loss, and multi-rate modulation can be achieved.

An information bit determination method and a mapping relationship generation method for polar-coded modulation, and devices thereof are provided. The information bit determination method includes: providing a mapping relationship table for a predefined polar-coded modulation scheme, the mapping relationship table at least including target rates, modulation orders and first parameters of a polar code / component code under different MCS indices; determining the quantity of information bits in each polar code / component code in a target polar-coded modulation system in accordance with the mapping relationship table; and determining an information bit set corresponding to each polar code / component code in accordance with the quantity of information bits in each polar code / component code in the target polar-coded modulation system, the information bit set being used to indicate a set of positions of the information bits. According to the present application, a mapping relationship generation method and an information bit determination method for polar-coded modulation are provided independent of a channel state, so it is able to improve the flexibility and the practicability of the polar-coded modulation scheme.

To prevent overinfusion, an infusion pump restricts the volume of infusate that the patient can receive over a given period of time by utilizing an analytical model of infusate volume delivered to the patient as a function of time that takes the form of a piecewise function, v(t). During initial programming of an infusion, an initial version of the model is created. The model is updated each time the flow rate modulation pattern is modified over the course of the infusion. Each update to the model results in one or more new elements being added to the piecewise function. The maxima of each element of the piecewise Δv(t) is determined and compared to a maximum permissible volume set by the user. If any of the maxima meet or exceed the value, an alert is issued. Once the maximum permissible volume is reached, the infusion is stopped.

The invention discloses an unmanned aerial vehicle surveying and mapping information transmission management system based on artificial intelligence, and the system carries out the real-time feature extraction of original surveying and mapping data through employing a pruned CNN, and carries out the fusion of multi-modal data through employing a cross-modal editor. A GNN graph neural network is used for analyzing the position, the electric quantity and the channel quality of the unmanned aerial vehicle cluster in real time to establish a dynamic communication topology, and a low-dimensional feature vector and a spatio-temporal feature vector are transmitted to a routing path optimization module based on the dynamic communication topology; a relay node is dynamically determined by taking minimization of end-to-end delay and maximization of network survival time as targets, and a routing path of the unmanned aerial vehicle cluster is optimized; and dynamically adjusting a transmission rate, a modulation mode and channel resources according to a real-time network load and a data priority in the unmanned aerial vehicle cluster after path optimization based on a bandwidth allocation model of DRL deep reinforcement learning. Redundant transmission is greatly reduced, and the bandwidth utilization rate is improved.

The invention provides a distance zero value data processing method under a measurement, control and data transmission integrated system, and belongs to the field of satellite measurement, control and communication. The method comprises the following steps: S1, generating an analog downlink high-bit-rate signal by using an uplink high-bit-rate modulation module; performing zero clearing on a main channel cyclic frame count in a data transmission frame structure; configuring a downlink demodulation module into a zero calibration mode, and determining an uplink frame phase input source of the receiver; triggering a reset pulse per second to stop outputting uplink measurement and uplink data transmission signals; s2, outputting uplink measurement and uplink data transmission signals at the same time; s3, a downlink demodulation module receives and demodulates the downlink data transmission signal, carries out frame synchronization, and samples an uplink frame phase to obtain pseudo-range information; s4, calculating a ground sampling frame phase difference value; s5, correcting a ground sampling frame phase difference value; and S6, calculating a distance zero value. According to the method, the analog source is used for generating the analog downlink high-bit-rate signal, and the problem that the distance zero value of a measurement, control and data transmission integrated system is difficult to calibrate due to asymmetry of uplink and downlink modulation systems is solved.

Disclosed in a mechanism for optimizing channel quality indicator feedback for code block group based transmissions, wherein a user equipment of a communication network receives an enhanced channel quality indicator configuration. Based on the enhanced channel quality indicator configuration, the user equipment performs measurements of channel state information reference resources with a plurality of code block groups comprising determining a highest data rate modulation and coding scheme index supported by the user equipment with an error probability that will not exceed a predetermined threshold for reception of at least one transport block from the communication network, and based on the performing, the user equipment sends, towards the communication network, information expressed with a channel quality index comprising an indication of the determined highest data rate modulation and coding scheme index for use with link adaption for improving spectral efficiency of radio resource allocations of at least one transport block with more than one code block group for at least one physical downlink shared channel transmission from the communication network, wherein the information expressed with the channel quality index comprises an enhanced channel quality indicator report that identifies a new enhanced channel quality indicator report table enumerating the highest data rate modulation and coding scheme index supported by the user equipment and an effective code rate that the communication network is directed to use for the at least one physical downlink shared channel transmission.

To prevent overinfusion, an infusion pump restricts the volume of infusate that the patient can receive over a given period of time by utilizing an analytical model of infusate volume delivered to the patient as a function of time that takes the form of a piecewise function, v(t). During initial programming of an infusion, an initial version of the model is created. The model is updated each time the flow rate modulation pattern is modified over the course of the infusion. Each update to the model results in one or more new elements being added to the piecewise function. The maxima of each element of the piecewise Δv(t) is determined and compared to a maximum permissible volume set by the user. If any of the maxima meet or exceed the value, an alert is issued. Once the maximum permissible volume is reached, the infusion is stopped.

The invention discloses an FSO adaptive modulation method for improving the spectrum utilization rate, and the method comprises the steps: S1, creating and training a channel state information prediction model, and predicting the channel state information through the trained model; s2, creating different atmospheric channel models according to the channel state information; s3, converting adaptive modulation into a Markov decision process by combining channel state information and different atmospheric channel models and aiming at selecting an optimal action and maximizing a system spectrum utilization rate and a maximum transmission rate, establishing a reinforcement learning algorithm, and performing joint scheduling on parameters including a coding rate, a modulation order and transmission power to obtain an adaptive modulation result; obtaining an optimal reinforcement learning model under the channel state information; and S4, performing adaptive modulation through the reinforcement learning model. According to the invention, adaptive modulation is realized by adopting a deep strong chemical algorithm, the calculation complexity and optimization difficulty can be reduced, and the processing efficiency and performance of the algorithm in coping with a large-scale decision space are improved.

The application belongs to the technical field of CO2 storage migration monitoring, and discloses a CO2 storage migration monitoring method and system based on distributed optical fiber acoustic wave sensing. By controlling the time-varying flow rate modulation coding sequence of the injected fluid, the wellbore itself is converted into a controllable virtual phased array sound source distributed along the wellbore. By using the pre-solved frequency-radiation angle mapping relationship, the direction of the acoustic wave energy radiated to the formation can be controlled by changing the frequency of the injected signal, and the directional scanning of the formation around the well is realized. This method does not need to lower a special acoustic logging instrument, reduces the operation cost and risk, and can flexibly adjust the detection angle and range according to the monitoring requirements.

The invention discloses a double-loop pseudo-rate modulation method and device suitable for multi-nozzle configuration. The method comprises the steps that S1, a main loop control comprehensive signal and an auxiliary loop control comprehensive signal are calculated respectively; s2, the control comprehensive signals of the main loop and the auxiliary loop are processed through a correction network, and main loop control duty ratio instructions and auxiliary loop control duty ratio instructions are generated; s3, feedback path signals of the pseudo-rate modulators of the main loop and the auxiliary loop are calculated; s4, converting the on-off state of the attitude control spray pipe into an on-off control instruction, identifying a disturbance torque coefficient on line, and respectively generating a main loop disturbance compensation duty ratio instruction and an auxiliary loop disturbance compensation duty ratio instruction; s5, integrating the control duty ratio instruction, the interference compensation duty ratio instruction and a pseudo-rate modulator feedback path signal to generate a main loop switch control instruction and an auxiliary loop switch control instruction; and S6, according to the distribution of the spray pipes, converting the main loop switch control instruction and the auxiliary loop switch control instruction into a spray pipe switch instruction and a multiplex spray pipe switch instruction respectively, and outputting the instructions to attitude control spray pipes for execution.

The invention discloses an on-line interference identification and compensation control method under switch control. The method comprises the following steps: (1) calculating a current quaternion deviation and a current attitude angular rate deviation; (2) calculating a control comprehensive signal according to the quaternion deviation and the attitude angular rate deviation; (3) generating a control duty ratio instruction from the control comprehensive signal through a correction network link and a gain correction link; (4) calculating a feedback path signal of the pseudo-rate modulator according to the switch control state; (5) on-line identifying disturbance torque according to the inertial measurement angle rate and the switch control state, and generating a disturbance compensation duty ratio instruction; and (6) integrating the control duty ratio instruction, the interference compensation duty ratio instruction and a modulator feedback path signal, generating a switch control instruction through a Schmitt trigger, and outputting the switch control instruction to an attitude control spray pipe. The invention aims to improve the control capability of the spacecraft under the time-varying large interference and improve the stability and the control precision of a control system.

A multimodal fusion underwater acoustic wired dual-mode communication system and method, relating to the field of underwater electrical communication transmission technology, addresses problems such as poor signal transmission reliability, disconnect between acquisition, computation, and communication, and the contradiction between power consumption and real-time performance in complex underwater channel environments. The system adopts a dual-core heterogeneous architecture, including modules for data acquisition, signal synchronization, fusion computation, and communication. The communication module is the core collaborative unit, supporting wired and underwater acoustic dual-mode communication. It employs LDPC-OFDM low-error-rate modulation and error correction technology, combined with a redundant storage module to achieve data temporary storage and automatic retransmission in case of link interruption. Through scheduling by the dual-core heterogeneous main control unit, it achieves full-link collaboration between acquisition, computation, and communication, optimizing transmission link selection and data packaging processes, and improving the real-time performance and stability of underwater signal transmission. It achieves low-error-rate transmission in high-noise environments, adapting to complex underwater communication environments such as marine gas leak monitoring and deep-sea earthquake early warning.

The present invention discloses an adaptive optical switching method based on FPGA platform in space optical communication. The present invention adopts dual wavelengths λ1,λ ’ 1 for communication, λ1 is the signal light, which is used to carry the “payload”, λ ’ 1 is the beacon light, whose primary function is to carry a "header" to establish and route space links. It can also provide feedback on the quality of the atmospheric channel, thereby adjusting the rate, routing path, and even the modulation format of the λ1 signal. The relay node allocates paths for light with different functions and sources, some of which enter the electronic control system (FPGA) and some directly enter the optical switch for transmission. This helps improve communication efficiency and resolve problems such as wavelength conflicts and the impact of atmospheric turbulence. This invention solves the problems of automatic routing and adaptive selection of channels, rates, and modulation formats in star networks and cascaded star networks.

The application discloses a magnetoencephalography compatible multi-channel near-infrared high sampling rate modulation method and system, and belongs to the field of multi-modal brain function imaging research.The method comprises the following steps: modulating a driving signal of an fNIRS light source to a high-frequency carrier; adopting a multi-channel frequency division multiplexing strategy, transmitting the modulated driving signal to each fNIRS light source, so that each fNIRS light source emits infrared light rays for detecting a target; and demodulating the detected infrared light rays to obtain the amplitude of the detected infrared light rays.The application can realize non-contact sensing of the target.The application can reduce electromagnetic interference in the process of MEG and fNIRS synchronous imaging, utilize specific frequency modulation technology to realize synchronous acquisition of magnetoencephalography signals and multi-channel high sampling rate near-infrared signals, and accurately and quickly demodulate the near-infrared signals.

Embodiments described herein may be related to optical devices and apparatuses directed to forming waveguides and optical phase modulators that enable high baud rate modulation. In one embodiment, an optical phase modulator includes: photonic optical waveguides having their cladding regions and electrical contacts formed by material with its absolute permittivity near zero (ENZ), and their waveguide core region formed by electro-optical (EO) material or silicon PN junction whose optical refractive index changes with strength of externally applied electrical field. The ENZ material described herein further possesses properties of both optical transparency at operating wavelength and electrical conductivity. The ENZ claddings and electrodes may further have dimensions to enable high externally applied electrical field within waveguide core. The EO material described herein includes but not limited to organic polymers, LiNbO3, liquid crystals. Other embodiments are described and claimed.

The invention discloses a brain magnetism compatible multi-channel near-infrared high-sampling-rate modulation method and system, and belongs to the field of multi-mode brain function imaging research, and the method comprises the steps: modulating a driving signal of an fNIRS light source to a high-frequency carrier; transmitting the modulated driving signal to each fNIRS light source by adopting a multi-channel frequency division multiplexing strategy, so that each fNIRS light source emits infrared light for detecting a target; and demodulating the detected infrared light to obtain the amplitude of the detected infrared light. According to the invention, non-contact perception of the target can be realized. According to the invention, electromagnetic interference in the MEG and fNIRS synchronous imaging process can be reduced, synchronous acquisition of brain magnetic signals and multi-channel high-sampling-rate near-infrared signals is realized by using a specific frequency modulation technology, and the near-infrared signals are accurately and rapidly demodulated.

A method for generating a mapping relationship of BIPCM, a method for determining an information bit set, and a device, the method comprising: determining an equivalent channel of the BIPCM system according to the target spectrum efficiency of the BIPCM system; calculating the finite code length channel capacity of each polarization code component code of the BIPCM system according to the equivalent channel; generating a mapping relationship table of the BIPCM scheme according to the finite code length channel capacity of each polarization code component code of the BIPCM system, wherein the mapping relationship table includes at least one mapping relationship, and each mapping relationship includes at least one of the target rate, modulation order, and polarization code component code attribute parameters under different MCS indexes. The present invention realizes a mapping relationship generation and information bit determination scheme of BIPCM that is independent of the channel state, thereby improving the flexibility and practical value of the BIPCM scheme.

The invention provides a modularized waveform architecture for communication signal simulation and a simulation method, relates to the technical field of communication countermeasure testing, and solves various limitation problems of a traditional special hardware platform in communication signal simulation. In the architecture, an information source scrambling component receives data to be modulated and performs scrambling processing on the data to be modulated; the channel coding component selects a corresponding coding mode to perform coding processing according to the parameter instruction; the group hopping frame assembly adds a synchronous code to the encoded data to realize framing, converts the framed data according to a corresponding hopping structure in a frequency hopping mode, and outputs the data; the spread spectrum component performs data expansion according to a spread spectrum multiple parameter value issued by configuration and then outputs the data; and the variable rate modulation assembly selects a corresponding modulation mode according to the parameter instruction to complete modulation mapping of symbols, and outputs obtained communication signals after rate control and filtering processing. According to the invention, advantages and effects of waveform dynamic generation and parameter real-time adjustment are smoothly realized.

The invention discloses a variable-rate FSK (Frequency Shift Keying) modulation and demodulation method, device and system based on an FPGA (Field Programmable Gate Array), and belongs to the technical field of FSK modulation and demodulation. Based on the FPGA, the method comprises the following steps of: controlling selection of a frequency word according to data to be sent during signal transmission, controlling updating of the frequency word according to a preset symbol rate, controlling a DDS (Direct Digital Synthesizer) to generate FSK modulation signals with different modulation orders by the frequency word; the operation frequency of the DDS is a modulation signal sampling rate; when a signal is received, a variable multiple CIC decimation filter is firstly used for decimation according to integral multiples, the sampling rate of the received signal is reduced, then Farrow structure fractional multiple decimation filtering is used for adjusting the sampling rate to a first symbol rate, and FSK demodulation and bit synchronization recover data in the adjusted signal. According to the invention, the transmission rate can be dynamically adjusted according to the channel state, the spectrum resource utilization rate is improved, and the transmission performance is improved.