43results about How to "Improve information transmission efficiency" patented technology

A subcarrier transmission ON/OFF control system based on an MC-CDMA system capable of improving information transmission efficiency and reception performance while keeping the number of transmission bits constant. Furthermore, a subcarrier transmit power control system based on an MC-CDMA system or OFDM system capable of improving information transmission efficiency and reception performance. The former system based on the MC-CDMA system does not carry out transmission through subcarriers of low reception quality, with no transmit power assigned (transmission OFF), assigns the corresponding transmit power to subcarriers with transmit power assigned (transmission ON) and carries out transmission (subcarrier transmission ON/OFF control) The latter system based on the MC-CDMA system or OFDM system carries out transmission according to a reception level of each subcarrier on the receiving side, with greater transmit power assigned to subcarriers with higher reception levels and smaller transmit power assigned to subcarriers with lower reception levels (subcarrier reverse transmit power control).

The invention provides a block chain information transmission method and system based on satellite-ground collaboration. The method comprises the following steps that a block chain core node receivesto-be-transmitted information sent by a block chain node, and verifies the to-be-transmitted information; after the verification is passed, the block chain core node sends the to-be-transmitted information to a communication satellite; and the communication satellite receives the to-be-transmitted information and broadcasts the to-be-transmitted information to each block chain node and the block chain core node through a wireless channel, so that each block chain node and the block chain core node carry out corresponding processing on stored block chains according to the to-be-transmitted information. According to the method and the system, the communication satellite broadcasts the information to each block chain node at the same time, so that point-to-point transmission in a P2P broadcasting scheme is avoided, the information transmission efficiency of the block chains is improved, the synchronization time of the nodes of the whole network is shortened, and the transaction efficiencyof a block chain system is improved.

The invention provides a millimeter wave large-scale MIMO system MMSE-PCA channel estimation method based on beam selection. The method comprises the following steps: firstly, selecting a beam signalon a base station side by taking MMSE precoding as an amplitude maximization standard; secondly, using a PCA channel compression method at a receiving end, to perform compression and dimension reduction on a channel; and finally, performing channel estimation by using a classical least square method (LS). MMSE precoding can reduce channel noise in the system and interference among users, and reduce the number of radio frequency links used by a base station, so that the implementation cost and energy loss of the system can be reduced. Meanwhile, the PCA compresses high-dimensional data into low-dimensional data by using the correlation of the original high-dimensional data. According to the method, on the basis of reducing the system complexity, the purposes of effectively optimizing the system transmission performance and improving the energy efficiency are achieved.

A receiving apparatus that can effectively use spectra to improve the interference resistance and the information transmission efficiency. In this apparatus, a channel estimating part (1006) uses a pilot received from the transmitting end to perform a channel estimation for each of subcarrier groups. A subcarrier group performance analyzer (1011) calculates, based on a channel estimation result, the SIR value of each subcarrier group. A control command generating part (1012) uses the SIR value of each subcarrier group to generate the puncture information and rate of the subcarrier group, then stores the generated puncture information and rate so as to perform an appropriate process when an S/P converting part (1005) performs an S/P conversion for next received information, and then feeds the generated puncture information and rate back to a transmitting apparatus.

The embodiment of the invention provides an advertisement putting method and device, and relates to the technical field of computers. The method comprises the steps that when a predetermined page is loaded, analyzing a pre-loading module corresponding to the predetermined page, wherein the pre-loading module comprises advertisement space information of an advertisement space to be displayed on thepredetermined page; Generating an advertisement inquiry request containing the advertisement space information based on an analysis result, and sending the advertisement inquiry request to a plurality of advertisement demander platforms; receiving Quotation information, returned by the advertisement demander platform, of an advertisement corresponding to the advertisement space information; And after determining a first target advertisement from the advertisements based on the quotation information, synchronously loading the predetermined page and the first target advertisement so as to display the first target advertisement on the predetermined page. According to the technical scheme provided by the embodiment of the invention, the advertisement loading efficiency and the information transmission efficiency can be improved.

The method includes following steps: the entitlement control message (ECM) transmitted by broadcast front-end equipment includes composite control message about conditional access; the composite control message is composed of non-randomness conditional message and randomness message to construct the data relating to cryptographic algorithm of scramble/descramble control word; the conditional message is a conditional reception control message relating to active reception time field or time quantum; the smart card in the reception end uses cipher key and conditional message in composite control message to compare and renew the relevant control message in smart card, and decides if the entitlement control message or composite control message are processed by using a certain kind cipher algorithm; the correct scramble /descramble control word is obtained to make descrambling for received scramble/descramble transport stream (TS).

The invention provides an information transmission method and an information transmission system. The information transmission method comprises the steps of acquiring an environment parameter in a greenhouse; respectively acquiring preset codes according to the environment parameter and the greenhouse, and generating a target code according to the acquired preset code; and sending the target code to a terminal or a server, thus allowing the terminal or the server to acquire information corresponding to the target code. According to the technical scheme of the method and system provided by the invention, the information transmission efficiency of the greenhouse can be improved.

The invention relates to an iterative channel estimation method for a multi-input multi-output (MIMO) relay system, which mainly solves the problem of joint information detection and channel estimation for a multi-user MIMO relay system. The method is implemented according to the following steps: 1) KRST coding is carried out on information signal transmission matrixes; 2) a plurality of users simultaneously send information to a relay; 3) the relay amplifies received signals, and forwards the amplified signals to a sink; 4) the signals received by the sink are constructed into a PARAFAC model; and 5) the information signal matrixes are detected through the BALS algorithm, and a combined channel is estimated. The method provided by the invention has the advantages that joint signal detection and channel estimation can be carried out rapidly and precisely, the applicability for a time division system and a frequency division system is achieved, and the communication reliability and a data transmission rate can be improved.

The embodiment of the invention discloses an information transmission method and apparatus in a cell, and relates to the technical field of wireless communication. The information transmission method and apparatus can be used for improving the information transmission efficiency of a wireless network. The method disclosed by the invention comprises the steps that a network device obtains terminal information, wherein the terminal information comprises a moving speed of a terminal, and/or, a position of the terminal in the cell; the network device determines the state of the terminal according to the terminal information, wherein the state of the terminal comprises a first state and a second state; when the terminal is in the first state, the terminal communicates on a competitive resource of the cell; and when the terminal is in the second state, the network device allocates a non-competitive resource of the cell to the terminal. The information transmission method disclosed by the invention is suitable for the wireless network.

The invention relates to a vehicle self-starting method based on visual perception. The method specifically comprises the following steps that: S1, an in-vehicle camera detects that a passenger gets on a vehicle and takes a seat, a safety belt sensor detects whether a safety belt is inserted into a safety belt clamping groove or not, safety belt prompt information is transmitted to the passenger if the safety belt is not inserted, and S2 is executed if the safety belt is inserted; S2, a vehicle door sensor detects whether a vehicle door is closed or not, if not, vehicle door prompt informationis sent to the passenger, and if yes, S3 is executed; S3, an outside-vehicle sensing device detects whether an obstacle exists around the vehicle and calculates the obstacle distance from the obstacle to the vehicle, and if the obstacle distance is smaller than a set safety distance, the outside-vehicle sensing device sends a starting instruction to a central decision system, and the central decision system starts an engine according to the starting instruction, otherwise, the outside-vehicle sensing device sends obstacle clearing prompt information to the passenger. Compared with the prior art, the method has the advantages that the starting experience and safety coefficient of automatic driving are improved, the information processing performance is improved, and the information transmission time is shortened.

The embodiment of the invention provides an underwater coupling power supply and information transmission device. The device comprise a charging plate, a power supply box, a first watertight connector, a second watertight connector, a power supply coil, a power supply receiving coil, a signal emission antenna, a signal reception antenna, a charging electronic cabin and a power supply electronic cabin, the charging plate is used for containing the power supply receiving coil, the power supply box is used for containing the power supply coil, the first watertight connector is used for connectingthe power supply electronic cabin and the power supply coil, the second watertight connector is used for connecting the charging electronic cabin and the power supply receiving coil, the power supplycoil is used for providing a power supply for the power supply receiving coil, the power supply receiving coil is used for receiving the power supply provided by the power supply coil, the signal emission antenna is used for transmitting signals to the signal reception antenna, and the signal reception antenna is used for receiving the signals transmitted by the signal emission antenna. Accordingto the underwater coupling power supply and information transmission device, the charging efficiency and the information transmission efficiency of underwater equipment can be improved.

The invention belongs to the field of Internet-of-Things detection, and provides a pipe network leakage detection system in an Internet-of-Things mode. The system is used for solving the problem of low communication efficiency during pipe network detection in the prior art and comprises an induction acquisition end, a server and an induction execution end. The induction acquisition end comprises acquisition modules and a communication module. Each acquisition module comprises a pressure sensor, a flow meter, a temperature sensor and a GPS meter which are installed in a pipe network, the pressure sensor, the flow meter, the temperature sensor and the GPS meter at the same position are mutually associated, and the communication module is used for communication connection between the acquisition modules. A signal receiving module is used for receiving the acquired information sent by the communication module and sending the acquired information to a data processing module and a review module. The data processing module is used for performing data processing on the acquired information, carrying out discrimination to know whether leakage occurs or not, and sending the acquired information and diagnosis information to a marking module and a sensing execution end. The marking module is used for sending site information to a database when the diagnosis information reveals leakage.

The invention discloses a chaotic multi-encryption data acquisition system. The system comprises a transmitting unit and a receiving unit, wherein the transmitting unit comprises a transmitting control unit; the transmitting control unit is connected with a sensor module for realizing data acquisition, connected with a data storage module for realizing local storage, connected with a chaotic encryption unit for realizing a data chaotic encryption operation, and connected with a signal transmitter for realizing transmitting of encryption information; and the receiving unit comprises a receiving control unit, and the receiving control unit is connected with a chaotic decryption unit for realizing decryption of received data, and connected with a storage module for storing data. The chaotic multi-encryption data acquisition system further improves safety performance, transmission efficiency and capacity of resisting disturbance of the existing data acquisition systems.

The invention belongs to the technical field of wireless mobile communication, and discloses an FPGA (Field Programmable Gate Array)-based biting differential OFDM (Orthogonal Frequency Division Multiplexing) communication system and method, the communication system is designed by adopting a time-frequency symbol hybrid differential OFDM technology and is built by using an FPGA; the system comprises: a sending end sends a data stream; carrying out channel coding; performing serial-parallel conversion; carrying out time-frequency symbol mixed double-bit differential modulation; mapping constellations; oFDM modulation is carried out; and the RF sending module sends. The receiving end RF receiving module receives the information; oFDM demodulation is carried out; time-frequency symbol mixed incoherent double-bit differential decoding is carried out; performing parallel-serial conversion; performing channel decoding; and recovering the data. According to the method, time-frequency symbol mixed double-bit differential coding and decoding are adopted, only one reference symbol is needed, and the system has the maximum information transmission efficiency; a receiving end does not need to perform channel estimation, so that decoding failure caused by phase inversion of a receiver is avoided; due to the parallelism of the FPGA and the high spectrum utilization rate of the OFDM, existing spectrum resources are fully utilized in high-hybrid communication and high-dynamic scenes, fading resistance is achieved, the bit error rate is low, and stability is good.

The invention provides an LED display advertisement machine system for the gas stations. The system comprises a box-shaped machine body, a main control box is arranged tolerably inside the machine body, a solar panel is arranged in an inclining mode on the top end of the machine body, an LED display screen and a signal light display screen are arranged in an embedding mode on the front and rear surfaces of the machine body; the main control box comprises a main controller, a clock chip, a wireless communication module, and a display screen drive circuit; the wireless communication module comprises a Wi-Fi wireless network module and an ARM9 module, and an infrared remote controller which matches with the main controller, the display screen drive circuit comprises an LED display drive module and a signal light display drive module; the Wi-Fi wireless intelligent network technology is utilized, so that different real-time gas station information is centrally managed by a large-scale intelligent network through a form of wireless networking on the LED display terminal, on the basis of the structural design of solar panels, the security risks of outdoor electric connections are eliminated, and the security of the advertising machine is improved.

The invention belongs to the technical field of unmanned aerial vehicle communication, and discloses an unmanned aerial vehicle cellular communication base station selection method based on position information, which comprises the following steps: S1, building a hybrid base station; s2, constructing a cellular communication network; s3, the unmanned aerial vehicle obtains the longitude, latitude,height and timestamp of the unmanned aerial vehicle in each time slice; s4, taking the hybrid base station in the communication range of the unmanned aerial vehicle as a communication base station, and sending a telemetry frame to the communication base station by the unmanned aerial vehicle; s5, counting the distance by the communication base station; s6, the communication base station sends a distance statistics frame to the console in each time slice; s7, the console marks an active base station and an inactive base station of the unmanned aerial vehicle according to the accumulated distance of the sliding window; s8, the console notifies the movable base station to switch to the current movable base station; and S9, entering the next time slice to accumulate the distance of the next round of sliding window. The method is wide in communication range, and solves the problem of selection of the most suitable base station by the unmanned aerial vehicle in a sliding window distance accumulation mode.