22 results about "Mimo detector" patented technology

The invention discloses a muon detector. A steel frame seat, a power supply, a muon receiving converter and a data receiving and processing device are arranged in a shell; the muon receiving converter is mounted on the steel frame seat and comprises a platy scintillator and a photomultiplier plate wrapping one surface of the scintillator; the data receiving and processing device comprises a trigger device, the front end of the trigger device is connected with a photomultiplier through a preamplifier, the rear end of the trigger device is connected with an analog-to-digital converter and a time-to-digital converter, and the analog-to-digital converter and the time-to-digital converter are connected with the central processing unit through data lines. A buffer memory is arranged on a connecting line of the analog-to-digital converter and the central processing unit; the power supply supplies power to the muon receiving converter and the data receiving and processing device through cables; and a display screen connected with the central processing unit is arranged on the shell. According to the invention, rock stratum changes and secondary disasters can be monitored in real time, dynamic and accurate three-dimensional data are provided for rescue workers, it is ensured that a rescue channel can be constructed quickly and effectively, and a rescue scheme can be adjusted in real time.

The invention relates to the field of semiconductor devices, and particularly discloses a photoelectric heterogeneous integrated microwave emission chip and a preparation method thereof, the chip is composed of a GaN HEMT amplifier and an InP UTC type detector on a SiC substrate; the preparation method comprises the following steps: preparing an amplifier on a SiC epitaxial wafer; growing a UTC type detector epitaxial layer on the InP substrate, and preparing a mesa structure; bonding the sapphire slide and the detector wafer; the InP epitaxial wafer substrate is removed; transferring the detector to an amplifier wafer through metal bonding; removing the temporary sapphire slide; and the detector is in electric signal communication with the amplifier. Compared with a method of firstly transferring an InP epitaxial layer and then preparing a detector device, the method has the advantages that the adverse effect of an InP-based detector processing technology on an amplifier is avoided; and secondly, the InP-based detector prepared by the method has the characteristic that the N-type contact metal faces downwards, and the structure is beneficial to reducing the junction region temperature and enhancing the heat dissipation capability of the device.

The invention relates to the field of MIMO signal processing, and discloses an MIMO-oriented bit width quantization method, device, equipment and medium, and the method comprises the steps: obtaining a plurality of variables to be quantized, carrying out the quantization of the integer bit width and sign bit width of the variables, obtaining the initial population of the variables, and carrying out the iterative optimization of the initial population, in any iteration process, carrying out the quantization of the integer bit width and sign bit width of the variables, and carrying out the quantization of the integer bit width and sign bit width of the variables. The method comprises the steps of determining a reference individual in a current population, performing decimal bit width updating on other individuals based on the reference individual, performing decimal bit width updating on any individual after the decimal bit width updating based on the target function value difference between the individual and the other individual, and determining a final population after iterative optimization is completed. And determining a target individual in the final population, and quantizing the decimal bit widths of the variables based on the decimal bit width combination of the target individual. According to the technical scheme provided by the invention, the automatic and efficient distribution of the decimal bit width in the MIMO detector is realized, and the calculation complexity and the hardware overhead are reduced.

The utility model discloses an air suction type smoke detector with an intelligent maintenance reminding function, which relates to the field of smoke detectors and comprises a detector shell, an air suction pipeline, an air suction pump, a smoke detection module, a control module and a communication module. A main control board, a filter, a pressure sensor and a detector are arranged in the detector shell, an air inlet is formed in the top surface of the detector shell, one end of the air inlet is fixedly connected with an air suction pipeline, and the other end of the air suction pipeline is fixedly connected with an air suction pump. The equipment replacement cost is reduced, overall management is convenient, reminding information can be sent to terminal equipment of a manager through the wireless communication module, the manager can know the maintenance requirement of the equipment in time no matter where the manager is, unified management and scheduling of the equipment are facilitated, and the management efficiency is improved.

The utility model discloses a battery compartment detector shunting structure which is installed in a detector and comprises a shunting seat and an on-off piston, a wide flow channel and a narrow flow channel which are linearly communicated with each other are formed in the shunting seat, and an air outlet communicated with the middle section of the wide flow channel is formed in the top of the shunting seat. A first external interface and a second external interface which penetrate out of the detector are formed in the bottom of the shunting seat, the first external interface is correspondingly communicated with one end, close to the narrow flow channel, of the wide flow channel, and the second external interface is correspondingly communicated with one end, away from the wide flow channel, of the narrow flow channel; a sealing cover penetrating cylinder is installed in the wide flow channel, the sealing cover penetrating cylinder blocks the end, away from the narrow flow channel, of the wide flow channel, a positioning cylinder channel and a reset cylinder channel are sequentially formed in the sealing cover penetrating cylinder in the direction towards the narrow flow channel, and a plurality of through openings communicated with the air outlet are formed in the end, close to the positioning cylinder channel, of the reset cylinder channel; the on-off piston can advance and retreat relative to the sealing cover penetrating cylinder and is arranged in the wide flow channel, and the narrow flow channel or the reset cylinder channel is blocked along with advancing and retreating of the on-off piston. The multifunctional computer desk has more diversified functions.

The application provides a high-speed wide-spectrum response photoelectric detector, an epitaxial structure and a preparation method thereof, and relates to the field of photoelectric chip manufacturing and processing. x Ga y As buffer layer, an In x1 Ga y1 As buffer layer, an N-In x2 Ga y2 As contact layer, an In x2 Ga y2 As intrinsic layer, an InGaAsP transition layer and a P-In x2 Ga y2 As contact layer; x+y=1, x1+y1=1 and x2+y2=1. The chip containing the epitaxial structure has a response wavelength covering 850nm-1650nm, is fast in response speed and wide in response wavelength.

This invention discloses a cerium-doped InP-based single-photon avalanche detector for space communication and its fabrication method. The detector's epitaxial structure, from bottom to top, includes a substrate, an N-type buffer layer, an absorption layer, a band transition layer, an N-type charge layer, an intrinsic multiplication layer, an intrinsic InP layer, and a cerium-doped P-type contact layer. The core innovation lies in the dual radiation-resistant design of the Ce-doped P-type contact layer and the Ce-doped modified stacked passivation film. The fabrication method involves MOCVD epitaxial growth, spin-coating source diffusion to prepare the P-type contact layer, ICP etching and wet repair, magnetron sputtering doping, and electrode fabrication. This invention utilizes Ce's unique electronic structure to suppress radiation-induced defects and combines this with an SACM structure to optimize the electric field distribution, achieving low dark count rate, high detection sensitivity, and excellent neutron radiation resistance. The process is compatible with existing semiconductor production lines and is suitable for wafer-level mass production, meeting the high-reliability single-photon detection requirements of aerospace missions such as space laser communication and quantum key distribution.

A system includes a user equipment in communication with a base station. The user equipment is configured to receive, via a user equipment, a signal from a base station via a channel, generate, via the user equipment, a channel estimate of the channel based on the signal, and predict, via a neural network, a predicted modulation format of the signal based on the channel estimate. The user equipment is further configured to select, via the user equipment, a first output of a first multiple-input multiple-output (MIMO) detector from a plurality of MIMO detectors based, at least in part, on the predicted modulation format of the signal, and generate, via the first MIMO detector, a logarithmic likelihood-ratio (LLR) based on the first output of the first MIMO detector

1. The name of this design product: built-in detector housing. 2. Purpose of this design product: used as the outer shell of the built-in detector on the energy storage fire extinguisher. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.

The invention discloses an intelligent long-life gas detector, which relates to the technical field of gas detection, and comprises a detector shell, a cover plate arranged on the outer side of the detector shell, a mounting frame fixedly connected to the interior of the detector shell, a gas circulation pipe arranged in the mounting frame and used for gas inflow, and a fixed round frame, the fixed round frame is fixedly connected to the interior of the mounting frame, a communicating pipe fixedly communicates between the fixed round frame and the gas circulating pipe, a rotating cylinder is rotationally connected to the interior of the fixed round frame, and a plurality of collecting parts used for collecting gas are arranged in the rotating cylinder; gas flows into the detection part from the collection part through the butt joint groove, the gas is detected through the detection part, after detection is completed, the switching mechanism enables the rotating cylinder and the communication disc to rotate in opposite directions, and at the moment, the collection part with the gas to be detected and the new detection part rotate to the two ends of the butt joint groove; therefore, the detection result is not influenced by the previous gas, and the accuracy of the detection data during each detection is ensured.

1. The name of the design product: integrated detector housing (SAC-MT102). 2. The use of the design product: the housing assembly product is mainly used for low-voltage terminal power distribution network of indoor buildings and similar places, and monitoring of key electrical factors of electrical lines. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view.

1. The name of the design product: integrated detector housing (SAC-MT103). 2. The use of the design product: the housing assembly product is mainly used for low-voltage terminal power distribution network of indoor buildings and similar places, and monitoring of key electrical factors of electrical lines. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view.

The utility model relates to the technical field of nuclear radiation detection, and provides a portable detector which comprises an anemorumbometer, an integrated Beidou short message communication device, a detector plate fixing seat, a detector plate, an upper cylinder, a portable support, a lower cylinder and the like. The integrated Beidou short message communication device is fixed through a damping ball head, the angle of the integrated Beidou short message communication device can be adjusted through random rotation, and the integrated Beidou short message communication device can be quickly disassembled and assembled through an Aka quick assembly plate. The portable detector provided by the utility model is simple in structure, low in requirement on the processing precision of the cylinder body, firm and reliable in fixation of the crystal, the photomultiplier, the voltage divider and the circuit board, compact and attractive in appearance, small in occupied space, convenient to carry and rapid to arrange.

The invention discloses a signal processing algorithm quantification method and system based on a discrete grey wolf optimizer (DIGWO). The method comprises the following steps: acquiring a to-be-quantized parameter in a signal processing process; setting a quantization bit width for each parameter to be quantized, wherein the quantization bit width comprises a decimal bit width; optimizing the decimal bit width of each parameter by adopting a discrete grey wolf optimizer DIGWO to obtain a final small-quantity bit width; wherein the feedback function of the DIGWO is established based on obtaining relative balance between two targets of reducing bit width and improving signal processing performance. Experiments show that when the method is applied to a channel hardening message passing (CHEMP) MIMO detector, the DIGWO quantization provided by the invention realizes that the average decimal bit width is reduced by 41.8% compared with the unified quantization (UQ) and is reduced by 24.9% compared with the automatic hybrid precision quantization (AHPQ) of the existing algorithm, and basically no performance loss exists. The method is also suitable for quantifying other communication system algorithms.

The invention belongs to the field of wireless communication, and particularly discloses a high-dimensional MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) implementation method and system based on space diversity. At a sending end, an input binary sequence is subjected to symbol mapping through a high-dimensional signal constellation diagram, space-time coding is carried out on a mapped high-dimensional signal coordinate component, fast Fourier inversion is carried out on each space-time code word, signals are converted from a frequency domain to a time domain, cyclic prefixes are added, and a high-dimensional signal is obtained. Signals are transmitted to a wireless channel through different antennas. At a receiving end, the time domain signal of each receiving antenna is subjected to cyclic prefix removal, then Fourier transform is carried out, the time domain signal is converted into a frequency domain signal, and an MIMO detector adopts a maximum likelihood or minimum mean square error algorithm, and after space-time decoding and high-dimensional signal de-mapping are carried out, an originally sent binary sequence is recovered. According to the invention, the spectrum efficiency can be improved and the system reliability can be enhanced.

The invention relates to the technical field of communication, and discloses a variable quantization method for an MIMO detector and computer equipment, and the method comprises the steps: determining a target quantization variable and corresponding state information for each time step, and enabling the target quantization variable to belong to a to-be-quantized variable set; historical time sequence information of the time step is obtained, the historical time sequence information and the state information are processed by using a deep cycle intelligent agent to determine a target output result of the target quantization variable, and the deep cycle intelligent agent is constructed based on a deep cycle Q network; determining a target execution action of the target quantization variable according to the target output result, and updating a quantization parameter of the target quantization variable according to the target execution action; and determining a final quantization strategy of the to-be-quantized variable set based on the quantization parameter updating result of each time step. According to the technical scheme provided by the invention, the calculation complexity and the hardware resource consumption of the MIMO detector can be reduced.

A circuit added to a smoke detector which uses a sensing device to detect interference to smoke detectors. The circuit can be MOSFET circuit or a normally open relay circuit. The sensing devices to determine whether interference has occurred to the smoke detector, for example covering or interfering with the outer housing of the smoke detector can include a fan, a distance sensing device, a LiDAR device or other devices.

The invention discloses an MMSE (Minimum Mean Square Error)-based MIMO (Multiple Input Multiple Output) detector of an L-BFGS (Library-Binary Frequency Gradient Square) optimization algorithm. The MMSE-based MIMO detector comprises an initial data fixed-point quantization module, an initial data fixed-point quantization module and a matching filter vector The custom bit width expansion module expands the bit width of the fixed-point signal; a data initialization algorithm module initializes parameters according to the MMSE filtering matrix and the matched filter vector; the dual-stage L-BFGS algorithm module executes a simplified L-BFGS algorithm to update a search direction in an initial iteration stage, and dynamically updates the search direction through a dual-cycle recursion mechanism in a memory iteration stage; and the adaptive iteration termination module dynamically monitors the validity of the search direction vector based on a preset threshold value, terminates iteration if the search direction vector is valid, and outputs a signal estimation value. According to the invention, the calculation complexity can be reduced, the hardware overhead can be reduced, and high precision can be maintained.

1. The name of the design product: integrated detector housing (SAC-MT101). 2. The use of the design product: the housing assembly product is mainly used for low-voltage terminal power distribution network of indoor buildings and similar places, and monitoring of key electrical factors of electrical lines. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view.

The present invention discloses a hanging device for a PET crystal unit, comprising a circuit adapter board and a front-end connecting board. The circuit adapter board is communicatively connected with the crystal unit and a PET detector main board respectively, so as to forward the data collected by the crystal unit to the PET detector main board for processing; the front-end connecting board is arranged between the circuit adapter board and the detector main board, the two ends of the front-end connecting board are respectively fixedly connected with the two shell side plates of the detector shell, and the front-end connecting board is provided with a slot, the detector main board is mounted on the front-end connecting board, the detector main board is communicatively connected with the circuit adapter board through the slot, and a plurality of mounting points are arranged on the front and rear side walls of the front-end connecting board for fixed connection with the detector shell. The hanging device shown in the present invention can effectively realize the connection of the entire crystal unit, and the overall structure is stable and easy to disassemble and assemble.

The invention discloses an MIMO (Multiple Input Multiple Output) detection maximum likelihood estimation method, which comprises the following steps of: acquiring a complex-valued transmitting signal and a complex-valued channel matrix between a receiving antenna and a transmitting antenna to obtain a complex-valued signal at a receiving end of a base station; according to the complex value transmitting signal, the complex value signal of the base station receiving end and the complex value channel matrix between the receiving antenna and the transmitting antenna, an optimal estimation signal is obtained, and MIMO maximum likelihood detection is mapped to an Isin model; mIMO maximum likelihood estimation is carried out through an Isin-MIMO detector, and a user emission signal is restored. The invention also discloses an Isin-MIMO (Multiple Input Multiple Output) detector. According to the method, the technical problem of how to accurately carry out MIMO detection maximum likelihood estimation in real time and output a result is solved.

The invention provides a visible-short wave infrared InGaAs detector with high quantum efficiency and a preparation method thereof, the visible-short wave infrared InGaAs detector comprises a special readout circuit chip and a photosensitive chip, and the photosensitive chip is composed of a P-type contact electrode region, a passivation layer, an InP cap layer P-type region, an InP cap layer N-type region, an In < 0.53 > Ga < 0.47 > As absorption layer, an N-InGaAsP contact and corrosion stop layer and an antireflection film layer from bottom to top in sequence. A traditional InGaAs detector epitaxial material structure is broken through, the ultra-thin N-InGaAsP layer (smaller than or equal to 20 nm) is adopted as the N-type contact layer and the corrosion stop layer, the material quality is ensured, meanwhile, the epitaxial material structure and the preparation technology of the detector are simplified, and the ultra-thin N-InGaAsP layer can effectively reduce invalid absorption of the N-type layer to visible light; the grid-shaped N-type contact region structure can further reduce invalid absorption of the N-type layer to the visible light wave band, the quantum efficiency of the InGaAs detector in the visible light wave band is improved to the maximum extent, and the detection capability imprisonment of a visible-short wave InGaAs detector is broken through.