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118results about How to "Transmission more" patented technology
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Indoor positioning method based on bidirectional wireless optical communication
ActiveCN104407327ASimplify design difficultyReduce design difficultyPosition fixationTransceiverOptical communication
The invention provides an indoor positioning method based on a bidirectional wireless optical communication. The indoor positioning method comprises the steps: a control centre provides a uniform time reference to realize time synchronization of N optical signal transceiver base stations; the control centre sends a distance measurement signal to the N optical signal transceiver base stations; after receiving the distance measurement signal, the N optical signal transceiver base stations transmit signals within the coverage scope; an optical signal transponder on a positioning terminal answers emission signals of M optical signal transceiver base stations and sends answering signals to the corresponding optical signal transceiver base stations, in which the number M is not less than 3 and not more than N; the M optical signal transceiver base stations respectively transfer the received answering signals to the control centre; and the control centre determines the position of the positioning terminal according to a transfer and distance-measurement principle, the sending time of the distance measurement signal, the position information of the M optical signal transceiver base stations and the receiving time of the corresponding M answering signals. The function of the positioning terminal is simplified and the precision of the indoor position is improved.
Owner:ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
Source end network coding and alternated transmission-based relay cooperation method
InactiveCN101958766ATransmission moreReduce multiplexing lossError prevention/detection by diversity receptionCommunications systemBinary information
The invention discloses a source end network coding and alternated transmission-based relay cooperation method, which is characterized in that: two relays are positioned outside the receiving radius of each other; a source end performs network coding on binary information sequences which are sent by the source end every three time slots; the two relays alternatively send the information in the adjacent time slots, the relay which sends the information in the last time slot receives the information in the present time slot, and the relay which receives the information in the last time slot sends the information in the present time slot; and when one relay receives the information sent by the source end in every time slot, the other relay forwards the information which is received and processed in the last time slot to a target end. Under the condition of not influencing cooperative diversity gain, the characteristics of two relay transmission models are fully utilized, more informationcan be transmitted within the same number of time slots, multiplexing loss in relay cooperative transmission is reduced, the transmission efficiency of the information is improved by 2 / 3, and both transmission performance and efficiency are considered in an actual relay cooperative communication system.
Owner:UNIV OF SCI & TECH OF CHINA
Method, device and system based on HARQ transmission
ActiveCN106899390AReduce wasteIncrease profitError prevention/detection by using return channelPhysical layerData needs
The embodiment of the invention provides a method, device and system based on HARQ transmission for at least solving the problem that the physical resource is wasted since excessive redundant information is transmitted aiming at the feature that the delay insensitive service data size is large when the existing HARQ mechanism needs to fill the current available physical resource by use of the data needing to be retransmitted in the retransmission. The method comprises the following steps: a base station performs the physical layer framing to acquire a physical layer frame, wherein the physical layer frame contains respective redundancy versions of M code words needing to be retransmitted and / or the code work of the first newly transmitted data; the code word of the first newly transmitted data is obtained by re-performing the channel encoding after performing the error estimation encoding on the first newly transmitted data by the base station; the code word of the firstly transmitted data is used for filling the residual resource except the resource occupied by respectively redundancy version of the M code words needing to be transmitted in the current available physical resource; the base station modulates the physical layer frame, and sends the modulated physical layer frame to the user equipment UE. The method, device and system are suitable for the wireless communication field.
Owner:HONOR DEVICE CO LTD
A 3G remote emergency command system
ActiveCN102263821ASolve the limitations of geographical boundariesIncrease opennessClosed circuit television systemsTransmissionCommand systemThird generation
The invention relates to the technical field of third-generation (3G) communication, and provides a 3G remote emergency direction system, which comprises a 3G intelligent recorder, an information and direction center (IDC) machine room unit, a headquarter monitoring center unit, a mobile monitoring center unit and a WEB monitoring center unit. The 3G remote emergency direction system can track and record the whole law enforcement process of a front-end police officer and timely transmit the environment and actual conditions of a law enforcement site in form of video and audio to make a direction center accurately and effectively direct the police officer and improve law enforcement efficiency.
Owner:WUHAN HUAAN SCI & TECH
Fixed-point quantitative convolutional neural network accelerator calculation circuit
PendingCN111832719ATransmission moreCalculation speedNeural architecturesPhysical realisationAsic technologyIntegrated circuit
The invention discloses a fixed-point quantitative convolutional neural network accelerator calculation circuit, and belongs to the technical field of integrated circuits. The method comprises the following steps of: processing input data of N input channels by using N input channel processing units, correspondingly multiplying a plurality of input feature maps and a plurality of weights in the input data of each input channel, and quickly adding to obtain convolution results of the N input channels; a partial accumulation unit accumulates all convolution results of the N input channels and outputs the convolution results to a quantization activation unit; and the quantization activation unit sequentially performs bias accumulation, approximate multiplier multiplication, right shift, function activation, zero point data addition and output digit amplitude limiting to obtain an output result of the convolutional neural network accelerator calculation circuit. According to the method, the calculation speed of the fixed-point quantized convolutional neural network is increased on the premise of not generating obvious precision loss, and the method has the characteristics of low powerconsumption and relatively small circuit area and is suitable for a convolutional neural network system needing to use shaping quantization.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Variable binary coding and decoding method based on communication integrated signals of MIMO radar
InactiveCN103997395ATransmission moreLarge capacityError prevention/detection by diversity receptionDecoding methodsPrior information
The invention relates to the radar communication technology and provides a variable binary coding and decoding method based on communication integrated signals of an MIMO radar. The variable binary coding and decoding method solves the problem that prior information of a coding party and a decoding party is possibly not synchronous in existing MIMO radar communications. According to the technical scheme, the method comprises the steps that firstly (M-1)*Ls spread spectrum subcode strings are optimized out through a genetic algorithm and are averaged to be M-1 sections, each spread spectrum subcode string corresponds to a channel and serves as a standby subcode string of the channel, then communication information to be sent by the nth channel is mapped to be a numerical value Dn, then the numerical value Dn comprising the communication information is converted to be a variable binary number, an arrangement serial number of the spread spectrum subcode strings is obtained, spread spectrum subcode strings of the launch channels carrying the information are generated sequentially again, finally the generated spread spectrum subcode strings of the launch channels carrying the information are added into a benchmark channel signal sequence, and a spread spectrum subcode string distribution list is formed and is launched out after signal generation and up conversion. The variable binary coding and decoding method based on the communication integrated signals of the MIMO radar has the advantages of increasing the throughput rate and being applicable to the MIMO radar.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Clustering routing method of micropower wireless sensor network based on energy difference
InactiveCN105813161AImprove performanceExtend the stable life cycleNetwork topologiesHigh level techniquesMobile wireless sensor networkData transmission
The invention provides a clustering routing method of a micropower wireless sensor network based on energy difference. The method comprises following steps of initializing network nodes; determining position distribution of each network node; initializing energy; dividing a network region into multiple clusters, wherein each cluster comprises a cluster head node, and other nodes in the cluster are member nodes; selecting the cluster head node of each cluster in a circular election mode; after a round of cluster head node selection is finished, selecting the closest cluster head nodes by non-cluster head nodes; joining in the clusters, thus being the member nodes of the clusters; and carrying out stable data transmission by each network node through taking the cluster as a unit. According to the clustering routing method of the micropower wireless sensor network based on energy difference provided by the invention, the stable life cycle of the network can be prolonged; and the energy effectiveness problem of the micropower wireless sensor network is solved.
Owner:CHINA GRIDCOM +2
A real-time control system and method for a humanoid robot
InactiveCN102298375AIncrease transfer speedImprove transmission performanceTotal factory controlProgramme total factory controlReal-time Control SystemNon real time
The present invention is a real-time control system and method for a humanoid robot, which includes an upper motion controller, several network controllers and several end nodes, adopts a double-layer network structure, and the upper motion controller and several network controllers form an upper layer The network communicates through a real-time Ethernet network, and each network controller forms a lower-layer network with a number of end nodes respectively, and uses the communication mode adopted by the end nodes to communicate; the present invention connects the upper motion controller and the network controller by using real-time Ethernet, On the basis of ensuring real-time performance, the system bandwidth is expanded, and it is also compatible with general end nodes that use non-real-time Ethernet for communication. By expanding the system bandwidth, the system network signal transmission speed and transmission capacity are improved, so that the overall system can transmit more control instructions at a faster speed, and the control accuracy and smoothness are improved.
Owner:ZHEJIANG UNIV
Monitoring data acquisition method and device
ActiveCN108881820AEfficient use ofReduce sizeClosed circuit television systemsNetwork connectionsNetwork packetData acquisition
The embodiment of the invention provides a monitoring data acquisition method and device, which are applied to articulated naturality web. The articulated naturality web comprises a monitoring unifiedmanagement platform MServer, an articulated naturality web monitoring client and a protocol conversion gateway, wherein the MServer and the protocol conversion gateway are bound to each other. The method comprises the following steps that: the MServer sends a monitoring data acquisition request to the protocol conversion gateway; after the MServer receives a resource response signal returned by the protocol conversion gateway for the monitoring data acquisition request, the MServer successively receives at least one compressed resource packet returned by the protocol conversion gateway; afterdecompressing the compressed resource packets, the MServer integrates the compressed resource packets into monitoring data, and saves the monitoring data into a database; and the MServer transmits the monitoring data saved in the database to the articulated naturality web monitoring client. Through adoption of the monitoring data acquisition method and device in the embodiment of the invention, the size of a transmitted data packet is increased; more data can be transmitted; the network bandwidth is better utilized; and the processing efficiency is improved.
Owner:海南视联通信技术有限公司
Rectangular core structure optical fiber
ActiveCN109445019ASolve efficiency problemsLarge transmission capacityOptical fibre with polarisationOptical fibre with graded refractive index core/claddingRelative refractive indexPolarization-maintaining optical fiber
The invention discloses a rectangular core structure optical fiber. The rectangular core structure optical fiber comprises a rectangular core and a cladding layer in order from inside to outside. Therefractive index of the rectangular core is larger than the refractive index of the cladding layer, and the relative refractive index difference therebetween does not exceed 2.5%. The rectangular corestructure optical fiber solves the problem of the mode mismatch and the low coupling efficiency of the on-chip rectangular waveguide in the existing optical fiber. For the shape characteristics, therectangular core structure optical fiber is a natural polarization-maintaining fiber, can transmit more modes, more effectively improves optical communication capacity, and is easy to integrate and low in cost.
Owner:PEKING UNIV
Method of transmitting information between two units each provided with means for sending and/or receiving signals
InactiveCN1449125ATransmission moreShorten the timePower managementError preventionField sizeWireless transmission
Owner:ASULAB SA
Intelligent video play monitoring recognition system
InactiveCN103002338AImprove practicalityImprove accuracySelective content distributionResource utilizationTelevision station
An intelligent video play monitoring recognition system is a system based on a linux platform server side and developed by c language. The intelligent video play monitoring recognition system relates to the technologies of streaming media, computer vision, digital image processing and the like and achieves intelligent video play monitoring functions of multi-video real-time storage of network audio / video streams, adding time codes to videos, respectively storing play monitoring video streams according to date, time and user specified directories, and analyzing two-dimension code information superposed on the videos and dynamically writing the information into a database and the like. The intelligent video play monitoring recognition system has the advantages of safety in thread, high resource utilization rate, low two-dimension code analysis error rate and video play monitoring stability, is widely applicable to video play monitoring of television stations at all levels as well as network video play monitoring of video websites, plays a leading role in play monitoring, detection and video play measurement and provides an important guarantee for video play.
Owner:杨世忠
Water, gas and electricity combined type automatic winding device
The invention relates to a winding device, in particular to a multifunctional winding device which can transmit different media at the same time. The water, gas and electricity combined type automatic winding device comprises a base plate, a brake disc, a wire inlet sealing cover, a central spindle assembly, a coil spring sealing cover, a coil spring, a shell, an integrated winding shaft, an integrated winding drum, a combined guide pipe, a protecting frame and a limiting ball, wherein the base plate is fixedly connected with the shell, the central spindle assembly is fixedly connected to the base plate, the brake disc is arranged on the base plate, the coil spring sealing cover is movably connected to the central spindle assembly, the coil spring is arranged in the coil spring sealing cover, the integrated winding shaft and the integrated winding drum are movably connected to the central spindle assembly, and the combined guide pipe is wound around the integrated winding drum. The function of the water, gas and electricity combined type automatic winding device is not a simple superposition of the electricity transmission function and the liquid transmission function, and the sealing performance requirement of liquid transmission and the insulating performance requirement of electricity transmission are met at the same time in one central spindle assembly through the ingenious structural design.
Owner:WENZHOU NIUNIU PNEUMATIC TECH
Radar communication integrated system and expansion method of system
ActiveCN110007277AAchieve system capacityMaximizeWave based measurement systemsVIT signalsIntegrated systems
The invention discloses a radar communication integrated system and an expansion method of the system. The radar communication integrated system specifically comprises a radar with the distance of R2and a control center; wherein the radar is used for transmitting a radio frequency signal s1 (t), investigating a target observation interval with the distance of R1, receiving echo signals reflectedby N targets in the target observation interval, extracting position information from the echo signals and transmitting the position information to the control center; and the control center is used for carrying out data processing on the signal transmitted by the radar to obtain the position of the target. According to the capacity expansion method, when the total power is limited, the capacity of a radar communication system serves as an optimization objective function, power distribution is conducted on the radar system and a communication network, the position of a radar is reasonably planned, and therefore system capacity maximization is achieved. According to the invention, real-time communication can be realized, and under the condition of the same transmitting power, compared witha common radar system, the radar communication system provided by the invention can transmit more data.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A LoRa-based data transmission terminal and a communication system with the same
InactiveCN109698710AWide coverageMany connectionsElectric signal transmission systemsTransmissionData transmissionPreamble
The invention provides an LoRa-based data transmission terminal and a communication system with the same, the data transmission terminal comprises at least two equipment connection interfaces, whereineach equipment connection interface is used for connecting equipment with data processing and communication functions; an LoRa module which is used for transmitting the data of the equipment to the outside or transmitting the data received from the outside to the equipment; a mode selection unit which is used for controlling the selection of the communication mode of the data transmission terminal and the mode selection of the LoRa module; And a processor which is respectively connected with the at least two equipment connection interfaces, the LoRa module and the mode selection unit, whereinthe processor is used for carrying out data forwarding between the LoRa module and the equipment and adding a preamble required by the LoRa module for carrying out data communication. According to the technical scheme, the technical problems that in the prior art, a data transmission terminal is high in power consumption, low in cost-to-efficiency ratio and small in coverage area, and rapid switching between different serial interfaces cannot be rapidly achieved are solved.
Owner:中国航天科工飞航技术研究院动力供应站
Electric power communication network resource management method based on edge computing
ActiveCN113286269AIncrease the number of businessTransmission moreData processing applicationsParticular environment based servicesNetwork resource managementEdge server
The invention discloses an electric power communication network resource management method based on edge computing. The method comprises the following steps: dividing levels according to the transmission security requirement degree of service data; obtaining a total communication time delay generated by service uploading, determining a time delay level of the service, and calculating a communication time delay return value of the edge server; acquiring the data scale and the service number of services contained in the edge server, and calculating the bandwidth transmission cost value generated when the edge server uploads monitoring service data; calculating the communication utility of the edge server according to the communication delay return value and the bandwidth transmission cost value; taking the maximization of the communication utility value of each edge server as a target, selecting a network resource allocation scheme with optimal balance of service transmission delay and bandwidth occupation, and completing the preprocessing and transmission of each service in the edge server, so the problem that the bandwidth of the electric power communication network is insufficient after the blockchain technology is added is solved.
Owner:ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER +2
Method for improving storage efficiency of moonlet moonlet-borne solid-state memory
ActiveCN105867849AImprove storage efficiencyExtension of timeInput/output to record carriersData fillingLabeled data
The invention relates to a method for improving the storage efficiency of a moonlet moonlet-borne solid-state memory. A new method is provided for solving the problem that a solid-state memory is low in storage efficiency. When the solid-state memory records data, frame synchronization is extracted to judge current AOS frame virtual channel identification, and if the current AOS frame virtual channel identification is a data filling frame, the current AOS frame virtual channel identification is not stored in the memory; if the current AOS frame virtual channel identification is an effective data frame, fixed data parts, such as a frame synchronization head, a version number, a spacecraft identifier, virtual channel identifier and channel coding check code parts not subjected to coding, in each frame are removed, and when data is read, AOS frame data is completely recovered according to label data made for an AOS frame. According to the method, only effective data in the AOS frame is recorded, and the storage efficiency of the solid-state memory is greatly improved.
Owner:AEROSPACE DONGFANGHONG SATELLITE
Method and device in telecommunications network
InactiveCN1269106ATransmission moreConnection managementRadio/inductive link selection arrangementsTelecommunications networkTelecommunications link
A method and an apparatus are disclosed, which enable the data communication connection between a first terminal (1; 101; 205; 301) connected to a data communication network (3; 103; 203; 303) and a second terminal (5; 105; 205'; 305) connected via a mobile telecommunications network to the same data communication network (3; 103; 203; 303) in which a connection request is sent from the first terminal (1; 101; 205; 301) to a node (9; 112; 217; 317) in the mobile telecommunications network, a signal is sent from the node (9; 117; 217; 317), requesting the second terminal (5; 105; 205'; 305) to establish a connection to the first terminal (1; 101; 205; 301), the connection between the second terminal (5; 105; 205'; 305) and the first terminal (1; 101; 205; 301), is initiated and established, with the second terminal (5; 105; 205'; 305) as the originator.
Owner:TELEFON AB LM ERICSSON (PUBL)
Flexible optical-fiber ribbon
The flexible optical-fiber ribbon can be reversibly adapted to both planar and non-planar shapes (e.g., packed via folding or rolling) without damaging the optical-fiber ribbon or its constituent optical fibers. This is achieved by bonding the plurality of optical fibres with a cured ribbon matrix (14) having elongation to break of at least 200% and a low Young's modulus of 1-20 MPa at 20 DEG C.
Owner:PRYSMIAN SPA
Method and system for implementing channel quality indication information transmission, subscriber terminal and base station
ActiveCN101299736ATransmission moreIncrease the number ofMulti-frequency code systemsInformation transmissionSubcarrier
The invention discloses an information transmission method, a system, a user terminal and a base station for realizing the channel quality indication, wherein the information includes the steps: receiving the distributing information of the CQI information of each user terminal; respectively modulating the CQI information of each user terminal into the initial symbol with the length smaller than N, wherein N is the number of used sub-carrier included in each OFDM symbols of the time frequency source; extending the initial symbol corresponding to each user terminal into the signals for transmission with the length N according to the distributing information; transmitting the signals for transmission. The embodiment of the invention differentiates the different terminal through the position, or the extended code and the identification code for transmitting the CQI information, thereby increasing the terminal number that can be held on the CQI source, to support further terminals to transmit the CQI information at the same time.
Owner:HUAWEI TECH CO LTD
Mobile video monitoring method, device and system
ActiveCN102316314AAvoid congestionImprove encoding rateClosed circuit television systemsDigital video signal modificationVideo monitoringVideo encoding
The invention discloses a mobile video monitoring method, a device and a system, wherein the mobile video monitoring method comprises the following steps of: A, carrying out new information detection on collected current frame video information; B, coding a new information frame when the new information frame exists and obtaining video coding data; and C, obtaining a current frame image after decoding the video coding data. The mobile video monitoring method, the device and the system have the advantages that the new information detection is carried out on the collected video information, thevideo information codes of the new information frame are uploaded only when the new information frame occurs, the coding rate is improved, the uploading data quantity is reduced, more images can be transmitted in a short time, in addition, useful video information can not be lost, and the monitoring effect is not influenced.
Owner:LIAONING MOBILE COMM
Power distribution station monitoring system
ActiveCN103135524AShorten the time intervalReduce data volumeThermometer detailsClosed circuit television systemsTime rangeImaging processing
The invention provides a power distribution station monitoring system. The power distribution station monitoring system comprises a digital camera, an image difference extraction unit, a transmission unit, an image processing unit and a monitoring system platform. The image difference extraction unit receives each frame of images of video pictures monitored by the camera, analyzes differences between two frames of images in a preset time range and outputs difference part data of image groups where differences exist. The transmission unit receives the starting point of the preset time range where the image groups with the differences are located and the first frame of images outputted by the digital camera, and meanwhile receives difference part data of different groups of image where the differences exist and outputted from the image difference extraction unit, and outputs the difference part data and the first frame of images. The image processing unit receives the first frame of images and the difference part data outputted from the transmission unit and reduces the video pictures frame by frame according to the first frame of images and the difference part data in the preset time range. The monitoring system platform is connected with the image processing unit, receives each frame of images sent by the image processing unit and continuously displays the each frame of images.
Owner:STATE GRID SHANDONG ELECTRIC POWER
Wireless transmission method and device
ActiveCN111555855AEasy transferImprove codec efficiencySynchronisation arrangementAssess restrictionComplete dataWireless transmission
Owner:ESPRESSIF SYST SHANGHAI
Pantograph head of ring shaft rotary electric traction locomotive
PendingCN109795324AGood followabilityReduce wind resistancePower current collectorsContact lineCopper
Provided is a pantograph head of a ring shaft rotary electric traction locomotive. The pantograph head of the ring shaft rotary electric traction locomotive is characterized in that an outer casing isfixed on the roof of the locomotive; a rotating shaft in a contact tube of a zigzag contact line can be rotatably mounted in the outer casing; an annular slide plate is mounted on a bracket; a plurality of power lines are arranged in the inner cavities of multiple support arms of the bracket; the outer ends of the power lines are connected with the slide plate; the inner ends of the power lines are connected with a central power line in a through hole of the rotating shaft; an annular copper sheet is fixed on the outer wall surface of the rotating shaft; a support spring between an annular electric brush and the outer casing forces the annular electric brush to attach to the annular copper sheet to generate current collection effect; the lower end of the central power line conducts currents to electrical equipment inside a vehicle body. The pantograph head of the ring shaft rotary electric traction locomotive has the advantages of enabling the slide plate to have various advantages such as high service life, large current collecting area, good stability and good heat dissipation, and being of high practical value and popularization value in the field of rail transit.
Owner:SOUTHWEST JIAOTONG UNIV
Data transmission method and device
ActiveCN106879076ATransmission moreImproved efficiency in transferring business dataWireless communicationBusiness dataComputer terminal
The application discloses a data transmission method and device, relating to the field of communication technology, and aiming at solving the problem that a base station has low efficiency of transmitting the business data by adopting unlicensed frequency bands. The data transmission method disclosed by the application comprises the following steps: when the base station needs to send the data to a destination terminal, the base station acquires a user group identifier of the destination terminal and locally acquires the effective CSI measurement result corresponding to the user group identifier of the destination terminal; and the base station sends the data to the destination terminal according to the effective CSI measurement result. The data transmission method and device disclosed by the application are suitable for the data transmission process.
Owner:CHINA UNITED NETWORK COMM GRP CO LTD
N-type bi-directional HEMT device based on CH3NH3PbI3 material and preparation method thereof
ActiveCN106654011AImprove device performanceImprove mobilitySolid-state devicesSemiconductor/solid-state device manufacturingSapphireOptoelectronics
The invention relates to an N-type bi-directional HEMT device based on a CH3NH3PbI3 material and a preparation method thereof. The method comprises the steps that a substrate is selected; an FTO film is formed; the CH3NH3PbI3 material is prepared to form a first light absorbing layer; a first electron transport layer is formed on the surface of the first light absorbing layer; source and drain electrodes are formed on the surface of the first electron transport layer; a second electron transport layer is formed on the surface of the first electron transport layer which is not covered by source and drain electrodes and source and drain electrodes; the CH3NH3PbI3 material is prepared on the surface of the second electron transport layer to form a second light absorbing layer; and a gate electrode is formed on the surface of the second light absorbing layer to finally form the bi-directional HEMT device. According to the invention, the symmetrical light absorbing layers are used to absorb more light to generate photogenerated carriers; transparent conductive glass grows on transparent sapphire as the bottom gate electrode, so that upper and lower light can irradiate the light absorbing layers; the CH3NH3PbI3 provides a large number of electrons for the channel; the mobility is improved; and the transmission characteristic and the photoelectric conversion efficiency are improved.
Owner:XIDIAN UNIV
8APSK mapping scheme for LDPC-BICM-ID system
ActiveCN109672500AReliable transmissionReliably transfer more transfersForward error control useMultiple carrier systemsFrequency spectrumCommunication quality
The present invention relates to the field of communication modulation constellation mapping, and is particularly suitable for an LDPC coding joint iterative demodulation decoding system. An 8APSK mapping scheme of an LDPC-BICM-ID system constructs a structure consisting of an inner ring and an outer ring on a plane-rectangular coordinate system with a real part as a horizontal axis and an imaginary part as a vertical axis, wherein the outer ring is distributed with five signal points, and the inner ring is distributed with three signal points, and an amplitude of each signal point is determined by positions of the inner ring and the outer ring where the signal points are located, an angle between a line connecting each signal point and the original point and the positive half axis of thereal axis represents a phase of a modulation signal of the signal. The system can improve spectral efficiency while obtaining coding gain, reliably transmit more information without increasing bandwidth, and can meet requirements of communication quality of wireless communication technology.
Owner:SHANXI UNIV
Collection method for vacuumizing data of refrigerator on production line
InactiveCN110111553AAchieve recordAchieve preservationTransmission systemsParticular environment based servicesData acquisitionEngineering
The invention belongs to the technical field of information collection and intelligent control and relates to a collection method for vacuumizing data of a refrigerator on a production line. The method comprises the process flow of mounting equipment; establishing a wireless network, setting a vacuum pump state, binding the refrigerator and a vacuum pump; connecting the refrigerator and the vacuumpump; collecting data; transmitting data; displaying data; unbinding the refrigerator and the vacuum pump; and storing the data. A main body structure of a collection device for implementing the method comprises a fixed scanner, an LED (Light-Emitting Diode) displayer, a first RFID (Radio Frequency Identification Device) card reader, and a second RFID card reader, an RFID chip, a main node module, a partial node module and an upper PC (Personal Computer); the device automatically binds the refrigerator and the vacuum pump and wirelessly collects the vacuum degree data by using a ZigBee module, so that the vacuuming work is carried out in an orderly manner, and the recording and storage of vacuumizing data on the refrigerator production line are implemented. The process method is scientific and reasonable, the equipment is advanced, the work efficiency is high, the management is facilitated and the application environment is friendly.
Owner:青岛奥利普奇智智能工业技术有限公司
Energy capture cognitive radio communication method based on transmission after listening
InactiveCN104467998ATransmission moreImprove communication throughputPower managementTransmission monitoringEngineeringPattern perception
Provided is an energy capture cognitive radio communication method based on transmission after listening. The method is characterized by comprising a cognitive radio 'transmission after listening' frame structure, a cognitive radio transmitter and a cognitive radio receiver. The cognitive radio frame structure is divided into a perception time slot and a transmission time slot. The method has the advantages that the cognitive radio transmitter can capture energy of external signals while perceiving the external electromagnetic signals; the transmitter converts the energy of all the captured external signals into electric energy required by the system and stores the electric energy into a battery when perceiving that an authorized user is idle; due to the increase of the battery capacity, the transmitter can transmit more information data at higher transmitting power, and therefore the communication throughout capacity of the system can be improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Design method for FIC new configuration in T-MMB system compatible with DAB
InactiveCN101132243AImprove transmission efficiencyImprove transmission reliabilityTransmissionCollocationCoding block
This invention puts forward a method for designing new collocation of FIC of a ground T-MMB system, which realizes a multimedia broadcast system compatible with DAB by adding some fast information groups in the FIC of transmitting frames of the T-MMB system to describe its code mode, modulation module and other properties. This invention includes a new expansion of a certain type of FIG to realize instruction of modulation mode, code mode, interlacing depth, protection grade and size of sub-channels and its start position of sub-channels of the T-MMB business and realizes flexible collocationto packet codes when increasing an expansion of a certain type of the FIG and describing position information of the packet coding block of the T-MMB business.
Owner:NUFRONT MOBILE COMM TECH
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