11 results about "Fiber wireless" patented technology

The invention discloses an optical fiber wireless heterogeneous network intelligent monitoring system and method based on energy-information co-transmission, and relates to the technical field of optical fiber wireless heterogeneous network intelligent monitoring, the system comprises a central base station unit, an energy-information co-transmission optical fiber transmission unit and a micro-nano integration unit; the central base station unit is integrated with a high-power laser with a first preset wavelength, a light receiving unit with a second preset wavelength and a data processing subunit; the high-power laser is used for generating an optical signal for transmitting energy; the light receiving unit is used for receiving monitoring data; the data processing subunit is used for realizing clock recovery, code element synchronization, serial decoding and data display functions; and the energy-information co-transmission optical fiber transmission unit takes a multi-core optical cable as a physical carrier and adopts a wavelength division multiplexing technology to realize isolated transmission of energy and information, one end of the energy-information co-transmission optical fiber transmission unit is in communication connection with the central base station unit, and the other end of the energy-information co-transmission optical fiber transmission unit is in communication connection with each micro-nano integrated monitoring unit.

The invention relates to the technical field of optical fiber wireless communication and mobile forward transmission, in particular to a digital analog optical fiber wireless forward transmission transmitting end parameter self-adaptive optimization method and system based on reinforcement learning. Decomposing the normalized wireless signal into digital parts of all levels and a final analog residual error part through multi-level modulation, and transmitting the digital parts and the final analog residual error part in a time division multiplexing manner; a receiving end represents inter-symbol interference caused by link nonlinear distortion and bandwidth limitation, and the signal-to-noise ratio of a recovery signal is calculated based on the error vector amplitude. Parameters of a transmitting end are optimized and modeled into a Markov decision process, states comprise rounding factors, scaling factors, constellation forming factors and pre-equalization filter tap coefficients of all levels, and actions are discrete increments of the parameters; a reinforcement learning agent is constructed by using a dual deep action value network, and training is updated in combination with experience playback and a target network. The reward function comprises a threshold satisfaction item and a signal-to-noise ratio change item; parameters are interactively updated in the training stage, and online self-adaptive adjustment is performed in the reasoning stage.

Disclosed is a fiber-wireless hybrid sensor network deployment method based on an annealing algorithm. In the method, a plurality of fiber sensing tips, a plurality of modulation and demodulation nodes, and a wireless gateway construct a fiber-wireless hybrid sensor network architecture. The fiber sensing tips are directly connected to the modulation and demodulation nodes by overhead optical fibers. The modulation and demodulation nodes modulate and demodulate the optical signals in the plurality of fiber sensing tips connected thereto to convert the optical signals collected by the fiber sensing tips into electrical signals, and transmit the processed electrical signals to the wireless gateway by wireless means. The number of enumerated modulation and demodulation nodes is N S Next, the deployment scheme of the modulation and demodulation nodes is optimized to obtain the optimal deployment scheme of the modulation and demodulation nodes by taking the minimum value of the scheme cost function as the target by using the simulated annealing algorithm, and the fiber-wireless hybrid sensor network architecture is deployed.

The invention belongs to the technical field of fluid control, and discloses a high-speed electric control valve and a control method thereof, and the valve comprises a tubular valve body, an internal diaphragm, a metal explosion wire adhered to the diaphragm, a connecting electrode and a control circuit. The energy storage circuit module is composed of a high-voltage capacitor and a fast thyristor, when a trigger signal is received, the thyristor is conducted to enable the capacitor to instantly discharge to the explosion wire, the metal wire is gasified to generate shock waves to break down the diaphragm, and microsecond-level high-speed conduction is achieved. The diaphragm is preferably a polyimide film with the thickness of 10-100 microns, the explosion wire is a copper / tungsten wire with the diameter of 0.05-0.5 mm, and the explosion wire is matched with a capacitor with the charging voltage of 200-1000 V and the capacitance value of 10-1000 [mu] F. The control method comprises the steps of diaphragm installation, capacitor charging, triggering signal sending, high-voltage discharging and diaphragm breaking conduction, and reliable operation is ensured by dynamically adjusting charging voltage and adopting an optical fiber / wireless triggering mode. The invention has the characteristics of fast response and strong interference resistance, and is suitable for high pressure difference occasions needing to accurately control the on-off of gas.

The invention belongs to the technical field of optical fiber wireless converged communication, and particularly relates to a bidirectional millimeter wave terahertz seamless optical fiber wireless integrated system. The system comprises an electrical / optical conversion module in a central unit / distributed unit, a downlink millimeter wave / terahertz generation module in an active antenna unit, a downlink receiving and digital signal processing module in a user side, an uplink millimeter wave / terahertz generation module in the user side, and an uplink receiving and electrical / optical conversion module in the active antenna unit. And an optical / electric conversion and digital signal processing module in the central unit / distributed unit. The all-photon up-down conversion technology is adopted on the optical fiber network side of the system, direct conversion of millimeter wave / terahertz and optical signals at the optical fiber end is achieved, and seamless integration of the millimeter wave / terahertz and the optical fiber network is achieved; the system provided by the invention has efficient two-way transmission capability, supports simultaneous transmission of an uplink and a downlink, and remarkably improves the data transmission rate.

The invention belongs to the technical field of optical communication, and particularly discloses an optical fiber-visible light converged communication system for transmitting end signal reverse probabilistic shaping. According to the method, carrier waves are injected into a base band, a single side band signal is formed, a KK receiving scheme meeting the minimum phase condition is combined with an RPS strategy of distributing constellation probability to an outer ring, efficient and steady recovery of a mixed link receiving signal under the conditions of low signal-to-noise ratio and limited peak power is achieved, and the method has the advantages of being simple in structure and convenient to operate. And the phase reconstruction reliability is improved by setting a proper carrier signal power ratio. The method overcomes the defects of insufficient stability of peak constraint and phase recovery when strong carrier waves and low signal-to-noise ratio coexist in a traditional direct detection link and high peak-to-average power ratio and aggravated mutual information degradation of conventional probability shaping under the low signal-to-noise ratio, has higher noise immunity and spectral efficiency, and can be applied to the field of wireless communication. The method is a feasible scheme for a 6G indoor optical wireless access and optical fiber wireless optical integrated network.

The invention discloses a method and a system for improving the capacity of a digital-analog hybrid optical fiber wireless system based on time-interleaved index modulation. According to the TI-IM (Time-Interleaved Index-Modulated) DA-RoF method, at a sending end, a communication signal is decomposed into a digital component and an analog residual component after being subjected to DA modulation, and an additional index bit is mapped into a time interleaving selection vector which is used for controlling the arrangement sequence of the digital component and the analog component in a plurality of time slots; and at a receiving end, synchronous recovery of the index information and the original communication data is realized through time de-interleaving and joint judgment based on a maximum likelihood criterion. According to the method, the signal dimension is expanded while the signal-to-noise ratio advantage brought by a DA-RoF system is kept, the communication capacity is remarkably improved, and the method has good system compatibility and engineering realizability and is suitable for future high-speed mobile forward pass and 6G optical wireless fusion networks.

The invention relates to the technical field of power system power distribution network monitoring, and discloses a multi-path adaptive communication switching power distribution network intelligent monitoring method, system and device and a medium. And establishing a multi-dimensional quality evaluation model covering signal strength, time delay and packet loss rate and a link health degree prediction mechanism, and performing intelligent path decision by adopting a deep reinforcement learning algorithm. The system monitors the state of each link in real time, triggers millisecond-level fast switching based on a Markov decision process when detecting quality degradation or predicting a fault risk, and avoids a multi-node switching conflict by using a distributed collaborative mechanism. Through resource pooling management and service priority scheduling, the reliability of high-priority services such as remote control and remote signaling is ensured, and safe and stable operation of the power distribution network is effectively ensured.

The application belongs to the technical field of optical fiber wireless network communication, and particularly relates to an M 2 -QAM four times frequency millimeter wave signal generation and transmission system. In the system, the sending end comprises an input module, an optical modulator, an optical coupler, an optical delay line, a polarization beam combiner, an optical fiber transmission module and a photodiode; the input module generates a binary message; the optical modulator modulates the binary message and a clock signal onto an optical carrier; the optical coupler and the optical delay line divide the signal into two orthogonal signals; the optical fiber transmission module transmits the synthesized optical signal; the photodiode square detects the signal and outputs a vector M 2 -QAM millimeter wave signal; the receiving end comprises a radio frequency source and a signal recovery module; the radio frequency source provides a local oscillation signal for mixing with a received signal to complete down-conversion of the signal; and the signal recovery module recovers the signal received by the oscilloscope. The system does not use DAC and optical filters, and can simultaneously realize vector M 2 -QAM millimeter wave signal and optical fiber wireless communication.

The application provides an airborne distributed PHM intelligent evaluation management system based on optical fiber wireless hybrid communication, belongs to basic electronic circuits in the electrical field, belongs to topological structures and circuits in the field of intelligent sensor detection, and relates to an airborne distributed PHM intelligent evaluation management system, which can realize distributed PHM intelligent evaluation management of an airborne system and stable, efficient, flexible and multi-mode hybrid communication in the system, mainly comprises an intelligent evaluation management master computer, distributed intelligent evaluation terminals and their attached sensors, a communication network and the like, in the management mode, the airborne system can be subjected to distributed PHM intelligent evaluation and management by using the application, and the system communication stability and configuration flexibility can be improved.