166results about How to "Guaranteed transfer rate" patented technology

The invention discloses an SC-OFDMA-based satellite mobile communication system for a forward link, which belongs to the field of satellite mobile communication. The SC-OFDMA-based system for the forward link is characterized in that single carrier signals of a user are mapped to different sub-carriers through DFT (discrete Fourier transform) or FFT (fast Fourier transform) and then subjected to IFFT (inverse fast Fourier transform) to realize orthogonal transmission of each user signal so as to improve the utilization rate of high frequency spectrum resources and reduce the peak-to-average power ratio of the satellite forward link; and in the multi-beam-based satellite mobile communication system, different sub-carrier groups are distributed to the users in a beam overlapped area according to the beams belonging to the users so as to reduce the co-channel interference between the low beams and fulfill the aim of improving the capacity of the system.

The invention relates to a virtual desktop transmission device and method. The virtual desktop transmission device comprises a client and a virtual desktop server, wherein a response server is also arranged between the client and the virtual desktop server; the response server is used for realizing the load balancing of requests and the buffer of virtual desktop frames. The method provided by the invention comprises the following steps: the client asynchronously sends requests to the response server; the response server sends the requests to the virtual desktop server through a load balancing algorithm; the virtual desktop server sends the virtual desktop frames to the response server; the response server stores the virtual desktop frames in a buffer; and the virtual desktop frames is sent to the client according to the bandwidth conditions of the client. By using the device and method provided by the invention, the transmission performance can be improved, the utilization of resources can be improved and the cost can be reduced.

The invention discloses a user clustering and power distribution method and device based on a deep Q network and a medium. The method comprises steps of using a user clustering and power distributionproblem for modeling a joint optimization problem; establishing a BP neural network to realize a power distribution function in the joint optimization problem; training a BP neural network by using the training data set, testing the network and storing a BP neural network model to obtain power distribution results under different channel conditions so as to realize power distribution; modeling theuser clustering problem into a reinforcement learning task; constructing a deep Q network according to the reinforcement learning task; and after the network is trained on line, training a deep Q network according to an input state, and selecting an optimal action as an optimal clustering result to realize user clustering. According to the method, the online calculation complexity can be reduced,the user fairness is ensured to a certain extent, and the spectral efficiency of the system is effectively improved.

The invention discloses a wireless LAN and an access method thereof. The wireless LAN includes at least two access points AP and a wireless terminal STA related to the at least two access points. The method includes: the related STA of the AP is announced to other AP in the wireless LAN and receive other related STA announced by other AP; upstream message of the STA related to the AP is transmitted to a transfer AP, which is other AP related to the STA at the same time. The invention also discloses a wireless LAN access device and can maintain the transmission speed when STA utilizes a plurality of wireless links and the AP upstream transmission breaks down.

The invention relates to a conflict-free, on-demand multiple access method, comprising: central control node announces collisions of node-sent reserved access packets have occurred and starts up conflict resolution stages, where each conflict resolution stage comprises several forecast burst and forecast confirm micro time gaps set in sequence; in the forecast burst micro time gap, each access conflicting node monitors or sends forecast burst packet according its virtual ID number, and the central control node receives the forecast burst packets; in the following forecast confirm micro time gaps, the central control node sends the results, and each access conflicting node monitors the results; after a node succeeds in access, the central control node sends result broadcast packet. And the invention can assure access conflicting nodes quickly connect to channel and obtain the channel use right and increases service packet transmitting time as far as possible, and increases the throughput of channel.

The invention discloses a lithium positive electrode surface protective coating and a method for preparing the same. The lithium positive electrode surface protective coating is characterized in thata protective coating mainly comprises nanometer particles which are stacked, and stacked pores of the nanometer particles are filled with solid electrolytes; the protective coating is arranged betweena lithium positive electrode and a diaphragm. The lithium positive electrode surface protective coating and the method have the advantages that the nanometer particles are stacked to form the protective coating, growth of lithium dendrites on lithium metal pole plates can be effectively inhibited by stacked structures formed by the nanometer particles by means of stacking, and accordingly the problem of diaphragm piercing due to growth of existing lithium dendrites can be solved; the solid electrolytes in the stacked pores of the nanometer particles are high in lithium ionic conductivity, accordingly, the transmission rate of the lithium metal pole plates can be guaranteed, side reaction between lithium metal and electrolyte solution can be effectively isolated, the recycling service lives of the lithium metal pole plates can be greatly prolonged, and the safety of the lithium metal pole plates can be improved.

The invention relates to a radar communication integrated waveform generation method based on a FMCW, and aims at solving the problems that a conventional radar and communication system occupies excessive resources, is higher in cost and is liable to generate electromagnetic interference. The specific process comprises the steps: 1, generating a radar linear FMCW (Frequency Modulated Continuous Wave); 2, generating communication data, carrying out the QPSK modulation of the communication data, and obtaining the modulated communication data; 3, loading the modulated communication data to the radar linear FMCW, and generating a radar communication integrated QPSK-FMCW signal s(t), wherein the QPSK is quadrature phase shift keying. The method is used in the field of radar communication.

The invention discloses an MIMO secret communication method based on differential chaos shift keying (DCSK). Due to improvement, information is made to be dispersed on two channels for transmission, the reference signal of each way of information is transmitted on the other way, and therefore even when a certain way of information is intercepted in the transmission process, an original signal can not be decoded, and meanwhile, the problem that the utilization rate of the channels is low is solved. Meanwhile, in order to solve the multi-path fading problem, the MIMO technology is used for suppressing the channel noise and the multi-path fading, and the system bandwidth and the transmission power do not need to be increased. By comparing the bit error rate of an original system with the bit error rate of an improved system, it is found that the bit error rate of the MIMO-DCSK secret communication system is lower than that of a traditional system in data transmission, meanwhile, the utilization rate of the channels is higher, and the secrecy is higher.

This invention discloses method for managing high-speed data transmission in a mobile communication system to realize a joint-scheduling for uplink and downlink. The invention comprehensively utilized the relevant information of uplink and downlink, such as the user transmission speed information of scheduling process, load information of the uplink and CQI information of downlink scheduling process, user transmission speeds, downlink code resources and power resources information etc. to schedule the uplink and downlink comprehensively and realize a reunified scheduling by using the same resources, and to adjust uplink and downlink transmission rates simultaneously.

The invention discloses a confidentiality communication method based on an improved type DCSK, and belongs to the technical field of signal transmission. In response to the confidentiality problem of the DCSK, after the improvement, information is scattered to two communication channels to be transmitted, a reference signal of the information in each channel is transmitted in the other channel, so that even the information in one channel is intercepted and captured in the transmission process, the original signal cannot be decoded, and the problem of low channel utilization rate is solved. Through the comparison of the original system bit error rate with the improved system bit error rate, the bit error rate of the improved type DCSK system is lower than the bit error rate of the traditional system in the data transmission process, and the channel utilization rate is much higher and confidentiality is much stronger. Through simulation it can be seen that the simulation result is consistent with the theoretical analysis, and confidentiality is greatly enhanced. Meanwhile, the improved type differential chaos shift keying DCSK confidentiality communication method is relatively low in complexity, easy for the project to be realized, and will has wide application prospect in the fields of images, military confidential information and the like.

The invention discloses a preparation method of total terpene lactones with low phenolic acid, which uses ginkgo biloba extract as a raw material, uses ethyl acetate backflow to extract and uses amide resin to purify and deacidify. The preparation method takes the ginkgo biloba extract as the raw material and water saturated ethyl acetate as a solvent; at the weight measurement ratio of extractives to the solvent of 1:1-15, the extractive and solvent are extracted for 0.5-5 hours at the temperature of 20-90 DEG C and filtered; filtrate is concentrated to obtain extractum; after the extractum is adsorbed by polyamide resin, the extractum is eluted by 10-50% of lower alcohol solution; fraction is collected, concerted and dried; and the fraction is smashed to obtain dry powder in which the total terpene lactone content is above 50% and ginkgoic acid is lowered than 1 ppm. The preparation process of the invention has short extract time, low extract temperature, high extract efficiency, small solvent amount, solvent and energy saveing and lowered production cost; the deacidifying process method is convenient to operate and can lower the ginkgolic acid below 1 ppm; and the technical method provided by the invention can effectively remove tannin and pigment in extractives.

The invention relates to the field of communication and discloses a data submission method, device and system, which are capable of dynamically adjusting the submission method according to the number of concurrent sockets in a network so that the data transmission rate is improved. The data submission method includes the following steps: a terminal receives data sent by a network side, wherein the data includes a socket set which is a set of data-sending network socket numbers; according to the socket set and a socket list which records socket numbers carried in historic data, the number of sockets which send data currently is obtained; when the number of the sockets which send data currently is smaller than a preset threshold N1, data is submitted according to an ordered submission method; and when the number of the sockets which currently sends data is larger than the preset threshold N1, the data is submitted according to a non-ordered submission method. The data submission method is used for submission of terminal-side data.

The utility model discloses a user access method of the HSDPA system, which is as follows: the service quality state in a district is detected based on the service quality information of connected users in the district required for access by HSDPA users; if the service quality state in the district meets the access qualification, HSDPA resources are allotted to the users requiring for access; otherwise, the users are rejected to access. The utility model adopts the indicators such as time delay and the data quantity in postpositional memory zones that are directly related to the service quality of data users as the criterion for user access, and can finish part of the judgment work by Node B to reduce the burden of RNC. The utility model reduces packet loss rate while ensuring the service quality of the users, and improves the user satisfaction degree.

The embodiment of the invention provides a method and device for switching modes, and relates to the field of communication. The method and device are used for improving the user experience. The method comprises the steps that when user equipment (UE) is in the state of being connected to a first network through a first network mode of a first communication mode, the UE determines whether the first network supports a first subsystem or not; if the UE determines that the first network does not support the first subsystem, and when the UE is connected to a second network not through the first communication mode, the UE starts a second communication mode and is connected to the second network through the second communication mode; the UE sends first register request information to the second network. The method and device are suitable for service transmission scenes.

The invention provides a transmission method for H264 coded video data in real-time communication. The method comprises the steps of forming H264 video codes into corresponding video frames, and generating an I frame, a B frame and a P frame in each video code stream; performing code stream packaging on the different types of video frames via a transmission protocol, and transmitting the packages into a network adapter physical layer via a transmission layer, a network layer and a data link layer; respectively placing the P frames and the B frames into two queues of a Video, placing the I frames into the queue of an audio, and then transmitting; during a transmission period, counting message transmission quantities of the queues within a limited interval, and computing a packet loss probability of each queue; adjusting GOP according to the packet loss probability of the I frame queue, and adjusting Reference according to the packet loss probability of the B frames; and when no B frame exists, adjusting the Reference according to the packet loss probability of the P frames. The invention also provides a transmission system for the H264 coded video data in real-time communication, and thus video transmission quality is improved.

The invention provides a method and a system for switching main and standby synchronous clocks under a BC (Basic Control) mode of a PTN (Packet Transport Network) synchronous network of a wide area protection system. Wide area control protection devices of various substations are connected through a PTN network device and interstation time synchronization is realized by adopting a BC synchronizing function of a transmission IEEE1588V2 protocol; when the main synchronous clock has a fault, a time service interface of each wide area control protection device is cut off, and the standby synchronous clock is fast tracked in this time; and after time precision of the standby synchronous clock is determined, switching completion information is sent to all PTN network devices to realize time service of each wide area control protection device again. The method and the system have the characteristics of fast fault switching speed, high accuracy, good signal transmission quality and low time deviation ratio of each wide area control protection device in a fault process of the synchronous clock.

The invention provides a third generation (3G)-based wireless remote monitoring system, which consists of a data acquisition module and a remote console. Monitoring equipment consists of the data acquisition module, a master control module, a control module and a 3G module. The data acquisition module and the control module are connected with the master control module respectively. The master control module is connected with the 3G module. The 3G module is connected with the remote console by the Internet. In the 3G-based wireless remote monitoring system, monitoring is performed by connecting the 3G module into the Internet to perform monitoring by connecting the 3G module into the Internet to ensure the transmission rate and real-time performance of data, provide advantages for the extension of the system, simultaneously ensure that the monitoring can be performed anywhere without the limitations of a data transmission range, and smoothly realize remote monitoring.

The invention discloses a parameter optimization method for a communication integration signal of an asymmetric triangular frequency modulation radar. The shape of a frequency curve of the integration signal is an asymmetric triangle, and the integration signal consists of two LFM (linear frequency modulation) signals with opposite frequency modulation ratio symbols. The first signal is an LFM signal with the frequency modulation ratio k1, has no modulated communication information and is used for the synchronization or capturing of a communication signal, and the second signal is an LFM signal with the frequency modulation ratio k2, wherein k1*k2 is less than zero. Communication code element information is modulated on the second signal in a mode (-1, 1). The method is based on a parameterized model of the communication integration signal of the asymmetric triangular frequency modulation radar, and employs a fuzzy function for representing radar detection performances and a target function for representing communication performances to optimize and design the parameters of the integration signal. The method guarantees the probability of successful capturing of communication through employing a shortest synchronization signal, and guarantees an information transmission rate at a certain signal to noise ratio under the condition of guaranteeing the radar detection performances.

Embodiments of the invention provide a data transmission method and a data transmission device. The method comprises the following steps: when a source node needs to send data, calculating routing metric values corresponding to all paths from the source node to a destination node according to loading capacities corresponding to the paths; according to the routing metric values, determining the path with minimum loading capacity as a main path, and determining all the paths other than the main path as alternate paths; judging whether the number of coding groups sent by the source node reaches a preset threshold; if the number of coding groups sent by the source node reaches the preset threshold, generating a second degree through a degree adjustment function, and transmitting the coding groups generated through coding processing to the destination node through the main path and the alternate paths; and judging whether data needing to be sent by the source node is sent, and if the data is sent, returning to the step of judging whether the number of coding groups sent by the source node reaches the preset threshold. By implementing the embodiments of the invention, efficient transmission of data in a wireless multi-hop network is realized.

The invention relates to the field of traditional Chinese medicines, and in particular relates to a Chinese medicine composition and a preparation method and an application thereof. The Chinese medicine composition is prepared from the following raw materials in parts by weight: 750 parts of Astragalus membranaceus, 500 parts of curcuma zedoary, 250 parts of Peganum harmala, 62.5 parts of Poria cocos, 2.5 parts of venenum bufonis, 125 parts of Rabdosia rubescens and 250 parts of radix bupleurim. According to the composition, a prescription of traditional body-strengthening and stasis-removing decoction is adjusted, and the use level of medicinal materials is reduced. The novel preparation method is adopted to respectively extract different medicines by different manners in allusion to effective components in the medicine, so that the transfer rate of effective substances is ensured. The Chinese medicine composition can be used for preparing medicines for treating advanced liver cancer, and the dosage form is free from a long time decocting process before administration as the traditional body-strengthening and stasis-removing decoction is to be decocted. The composition is accurate in dosage, convenient to store and stable in property, the patient is convenient to take the composition, and unnecessary pain caused by bad taste of the traditional decoction to the patient is further avoided.

The invention discloses a mobile phone back housing capable of realizing wireless charging. The mobile phone back housing is composed of at least two layers of ceramic sheets, a coil is printed on each layer of ceramic sheet, and electric connection between the ceramic sheets is realized through through holes. The thickness of each ceramic sheet is 20 [mu]m-1000 [mu]m, and the total thickness of the mobile phone back housing is 0.2 [mu]m-2 [mu]m. Correspondingly, the invention further provides a method for preparing the mobile phone back housing capable of realizing wireless charging. According to the invention, the wireless charging efficiency of a mobile phone is improved, the wireless charging speed is substantially increased to 2-3 times of the speed of common wireless charging, the thickness of the mobile phone is not increased but decreased, the lightening and thinning requirements of a user to the mobile phone are met, and the market competitiveness is improved.

The invention discloses a method for detection and classification of internal circular spline products in harmonic reducers. The method comprises the steps of (1) product detection, (2) channel product classification and (3) maintenance and overhauling. The invention provides a technical proposal related to the method for detection and classification of the internal circular spline products in theharmonic reducers. The overall structural design is rational; all-automation processing of product detection and classification is realized; manual labor strength is effectively reduced; safety performance of operations is improved; classification of the products is more accurate and convenient; the error rate of product classification is effectively reduced; the waste rate of resources is reduced; and data is transmitted to a control system in time during full-automatic classification, so ratio data of qualified and rejected products detected in classification can be updated in time and thusthe reject rate of the equipment production products can be controlled.

The invention relates to an Ethernet-based high-speed seismic data transmission and control system. The system comprises a frame length threshold unit, a flow control unit, a retransmission rate threshold control unit and a drive frame-receiving unit, wherein the frame length threshold unit is used to regulate the length threshold of Ethernet frame transmitted in intersecting line; the flow control unit is used to dynamically adjust the balance among transmission stability, transmission efficiency and transmission delay on the basis of a timer; the retransmission rate threshold control unit contains a controllable automatic retransmission mechanism and a configurable retransmission rate threshold; when the retransmission rate exceeds the threshold value, the upper host and operating personnel decide the subsequent operation; and the drive frame-receiving unit is used to establish an Ethernet link layer zero-copy fast-forwarding mechanism, and drive the mechanism to receive the entire frame and read the data required to read from the frame and send the read data to upper application task; and the system of the invention is suitable for the transmission of the large-scale seismic data acquisition system, and can ensure the transmission rate of data, avoid the packet loss phenomenon in data transmission to the maximum and ensure the transmission quality of field data acquisition under appropriate and stable transport protocol.

The invention discloses a green secure communication method for a multi-user interference alignment network. In the interference alignment network, artificial noises are sent through adoption of a full duplex receiving end, thereby realizing secure communication; at a receiving end, through utilization of a power split method, simultaneous information and power transfer can be finished; and an information and power allocation proportion is optimized through adoption of a constrained convex optimization algorithm, thereby overcoming defects in the prior art. The method has the beneficial effects that the artificial noises are utilized fully at the receiving end, a network transmission rate can be ensured, moreover, an eavesdropping rate of an eavesdropping end is clearly reduced, a simultaneous wireless information and power transfer technology is enabled to achieve relatively efficient power collection, and the secure communication and green communication are effectively combined.

The invention relates to an electrode for a lithium battery, a preparation method of the electrode and the lithium battery containing the electrode, and belongs to the technical field of batteries. The electrode for the lithium battery comprises a current collector, an electrochemical active layer arranged on the current collector and a modification layer coating the outer surface of the electrochemical active layer, wherein the material of the electrochemical active layer comprises an electrode active material, and the modification layer is formed by a lithium ion exchange polymer. Accordingto the electrode for the lithium battery, the lithium ion exchange polymer is used as the modification layer to coat the electrochemical active layer, and the modification layer has relatively good conformality for the electrode, so that material pulverization caused by volume change is inhibited to a certain extent, and cracking of a pole piece is inhibited; and meanwhile, the lithium ion exchange capacity can also guarantee the lithium ion transmission rate in the electrochemical process, and the influence of the coating on impedance is reduced.

A shipborne expendable optical-fiber bathythermograph comprises an all optical fiber probe, transmission optical fibers and a deck unit, wherein the probe measures the seawater temperature through LPG (long period fiber gratings) and measures the seawater depth through FBG (fiber bragg gratings), and seawater temperature and depth profiles are measured independently at high sensitivity; the deck unit comprises a broadband light source, a dynamic fiber grating fast and high-precision demodulation module, an optical fiber isolator, a first optical fiber coupler, a second optical fiber coupler, an upper fiber shaft and a telescopic support mounted on the board of the stem of a working ship. The thermograph solves the problems of cross sensitivity and sensitization of a sensor, the sensitivity of temperature and depth measurement is improved, errors caused by enameled wire channels are overcome, the signal transmission rate and the stability are guaranteed, single light path cascade of FBG and LPG is realized, a light path structure is optimized, the spectral region is allocated reasonably, temperature and depth synchronous detection is realized, the thermograph is simple to manufacture, the probe is low in cost, and a new technical means is provided for detection of the seawater temperature and depth profiles.

The invention relates to an electroencephalogram collecting and transmitting system and method. The electroencephalogram collecting and transmitting system comprises an electroencephalogram signal collecting circuit, a first optical signal circuit, a second optical signal circuit, a digital processing circuit and a collecting host machine, wherein the electroencephalogram signal collecting circuit is used for collecting multi-channel electroencephalogram signals, the first optical signal circuit is connected with the electroencephalogram signal collecting circuit and used for converting the multi-channel electroencephalogram signals into optical signals, the second optical signal circuit is coupled with the first optical signal circuit and used for receiving the optical signals and converting the received optical signals into first electrical signals, the digital processing circuit is connected with the second optical signal circuit and used for conducting digital processing on the first electrical signals to obtain second electrical signals, and the collecting host machine is connected with the digital processing circuit and used for displaying and analyzing the electroencephalogram signals. Transmission is achieved through the optical signals, so that electric isolation between the electroencephalogram signal collecting circuit and the digital processing circuit can be achieved, and the electroencephalogram collecting and transmitting system has the advantages of being resistant to interference, stable and high in transmission speed.

A wave beam forming method in power line MIMO communication based on energy efficiency is disclosed. The method comprises the following steps that a, a sending terminal of a MIMO power line communication system sends a pilot frequency sequence to a receiving terminal; the receiving terminal estimates a channel matrix H according to the received pilot frequency sequence; b, the receiving terminal carries out quantification on the estimated channel matrix H so as to acquire a feedback channel and then feeds back a number of the feedback channel to the sending terminal; c, the sending terminal takes maximization energy utilization efficiency as an optimization object and calculates a wave beam forming matrix T according to the feedback channel; d, the receiving terminal calculates an equalization matrix G according to the wave beam forming matrix T calculated by the sending terminal; e, the receiving terminal acquires x<hat> according to the equalization matrix G. An iteration method is used to calculate the wave beam forming matrix and the corresponding receiving terminal equalization matrix so that a system interference is eliminated, an information transmission rate is guaranteed and energy utilization efficiency of the system is increased.

The invention provides a method for improving the quality of Ganmaoling granule intermediates. The method comprises the following steps: characterizing a degradation rule of linarin by adopting a reaction kinetic model, acquiring a quantitative relationship among the temperature, time and linarin content changes, proposing a principle of taking the linarin retention rate as a quality control index, and setting material retaining time according to the concentration temperature to ensure the transfer rate of an index component namely linarin of the Ganmaoling granule intermediates. The method provided by the invention is reasonable to design, reveals that linarin degradation reaction can meet the characteristics of first-order reaction in a concentration process, is clear in control index, and has practical operability; a technical method for effectively controlling quality indexes of the Ganmaoling granule intermediates can be provided for industrial production, and the technology upgrading of large varieties of traditional Chinese medicines can be benefited; and a technological idea based on process validity period control can be proposed, and the target of improving the quality of the Ganmaoling granule intermediates can be achieved.

The present invention discloses an extract of Chinese medicinal material salvia root, its total salviolic acid content can be up to above 50%, at the same time said invention also discloses a method for preparing said extract. Said method includes the following steps: using weak acid to extract the Chinese medicinal material salvia root, adding metal ions into the extract, making salviolic acid be precipitated, separating precipitate, using acid solution to dissolve said precipitate, then using ethylacetate to make extraction, recovering ethyl acetate so as to obtain the invented salvia root extract.