219results about How to "Large transmission capacity" patented technology

A method for deploying a cellular wireless communication network is provided. The method consists of: providing one or more micro base stations; autonomously deploying the micro base stations using a network access point linked to a cellular wireless communication network; and enabling configuration of the micro base stations to execute network operation commands from a network controller associated with the wireless communication network. Another aspect consists of enabling cooperation and network connectivity between micro base stations and other base stations, including micro base stations and large network base stations. Network connectivity to one or more cellular communication terminals associated with individuals or businesses subscribing to the cellular wireless communication network is enabled. A wireless network is also provided which is configurable to link a cellular wireless network through a high data transmission connection so as to define at least one access point between the micro base station and the wireless network. The network includes a wireless interface and receives operation commands from a network controller for configuration of micro base stations, to support the linking of cellular wireless terminals to the wireless network via the wireless interface by operation of the micro base station, as an intermediary. A corresponding system and computer readable medium is also provided

The invention discloses an electricity-gas interconnected comprehensive energy system peak clipping and valley filling method based on electricity-to-gas conversion. The method comprises the steps of firstly respectively establishing a power network model, a natural gas network model, an electricity-to-gas conversion model and a gas turbine model, wherein the power network and the natural gas network are coupled to form an electricity-gas interconnected comprehensive energy system via the electricity-to-gas conversion model and the gas turbine model; then introducing an economic conversion coefficient to project a net load peak clipping and valley filling target to an economic dimension, and forming a target with the lowest comprehensive cost together with the target with the lowest system operation cost, and establishing an electricity-gas interconnected comprehensive energy system peak clipping and valley filling model with consideration on various constraints of the power network and the natural gas network; and solving by using optimization software The General Algebraic Modeling System (GAMS), wherein an example analysis result shows that the model provided by the invention has good peak clipping and valley filling effect.

The invention discloses a single-antenna RRU (remote radio unit) comprising one or a plurality of radio-frequency far ends and an IR processing unit, wherein each radio-frequency far end is connected with an antenna, a received uplink analog radio-frequency signal is processed into an uplink digital intermediate-frequency signal, the uplink digital intermediate-frequency signal is transmitted to the IR processing unit, a downlink digital intermediate-frequency signal from the IR processing unit is received and is processed into a downlink analog radio-frequency signal, and the downlink analogradio-frequency signal is transmitted to the antenna. Simple protocol transmission is adopted between the radio-frequency far ends and the IR processing unit. The IR processing unit processes the uplink digital intermediate-frequency signal from each radio-frequency far end into an uplink digital baseband signal, the uplink digital baseband signal is transmitted to a BBU, a downlink digital baseband signal from the BBU is processed into a downlink digital intermediate-frequency signal, and the downlink digital intermediate-frequency signal is transmitted by selecting one of all the radio-frequency far ends. By adopting the single-antenna RRU, a plurality of radio-frequency far ends can be adopted to carry out coverage, so that the transmission capacity of the RRU can be expanded.

Disclosed is a wireless communication system which carries out spatial multiplexing communication forming multiple spatial channels between a pair of a transmitter with multiple antennas and a receiver with multiple antennas, having the transmitter and the receiver. In the system, the multiple spatial channels are divided into one or more groups, the transmitter transmits reference signals corresponding to spatial channels in succession in a time-division manner for each group, and the receiver acquires a channel matrix whose column vectors are transfer functions of the spatial channels obtained from the reference signals for each group and spatially demultiplexes a receive signal using a receive weight obtained based on the channel matrix.

The invention relates to a method used for digital bus information releasing and group control and a device thereof. The technical measure comprises the following steps: a vehicle terminal system, an electronic station board system and a vehicle technical information management centre are arranged, the electronic station board system is the vehicle technical information management centre are connected into a bi-directional communication network by line link, the vehicle terminal system transmits the vehicle information to the electronic station board system in a wireless communication, the electronic station board system reports the information to the vehicle technical information management centre, the bus coming to station at each station can be found out by inquiring a database, the station arriving time of the bus is calculated according to experimental data including average running speed, average running time between the stations and the like, finally, the arriving time is fed back to the electronic station board system, and the arriving time is displayed to the waiting passengers in a digital way. The method can effectively solve the problems of bus reduction in city and dispatching, information releasing, passenger facilitation, intelligent management control and the like. Therefore, the method realizes intelligent bus dispatching.

The invention relates to a design method used for transmitting DC high-temperature superconducting cable body coaxially and bidirectionally, belonging to the field of power system transmission and transformation; the design method comprises the steps as follows: according to the mechanical characteristic and the radius of enwinding framework of the superconducting strips, parameters of the superconducting cable body such as the enwinding helix angle and the enwinding pitch are determined; the magnetic field distribution of all layers of superconducting cable body are determined according to the operation current, thus determining the critical current on all layers of the cable; according to the critical current and the operation redundancy, iterative calculation is carried out for operation current and the magnetic field, thus finally gaining the critical current, best operation current, enwinding layer number and number of the cables. The designed superconducting cable body increases no enwinding process difficulty and achieves bidirectional transmission of DC current; the utilization ratio of the superconducting strip critical current reaches more than 90%; the quantity and low-temperature heat loss of the superconducting cable low-temperature container are respectively reduced by half. The design method has the advantages of large transmission capability, no loss, compact structure, certain current limiting capability, stable mechanical structure, self-shielding, no electromagnetic interference and the like.

The invention relates to a digital microwave transmission device and a digital microwave transmission method. The device comprises a main unit and a remote unit which are arranged at each station. The main unit and the remote unit at one station are connected through an optical fiber cable. Remote units between two stations are wirelessly connected. Each main unit comprises an interface processing unit, a main transmission link, a main receiving link, a main wavelength division unit and a remote control unit. Each remote unit comprises a remote wavelength division unit, a remote transmission link, a remote receiving link, a duplexer unit and an antenna unit. The main unit adopts digital modulation-demodulation and shaping filtering to convert user digital signals into optical signals which are transmitted through optical fibers. After the optical signals reach the remote unit, the optical signals are restored to radio-frequency signals which are converted into wireless signals through power amplification for transmission. The device provided by the invention has the advantages that the transmission distance is long, the cost is low, the main functions are completed on the main units, the power consumption of the remote units is low, and the problems that the transmission through optical fibers at complex terrains is inconvenient to realize and the loss of long-distance wireless transmission is great are solved.

Systems, methods and computer readable media for deploying a cellular wireless communication network. The method consists of: providing one or more micro base stations; autonomously deploying the micro base stations using a network access point linked to a cellular wireless communication network; and enabling configuration of the micro base stations to execute network operation commands from a network controller associated with the wireless communication network. A wireless network is also provided which is configurable to link a cellular wireless network through a high data transmission connection so as to define at least one access point between the micro base station and the wireless network. The network includes a wireless interface and receives operation commands from a network controller for configuration of micro base stations, to support the linking of cellular wireless terminals to the wireless network via the wireless interface by operation of the micro base station.

The invention discloses a polarization shift keying demodulation method and a system. The method comprises the steps of: splitting a single-frequency continuous laser wave beam in an adjusted polarization state into a horizontal polarized light wave beam and a vertical polarized light wave beam which are orthogonal to each other, and conducting polarization shift keying modulation to one light wave beam to form a polarization shift keying modulated light wave beam; keeping the polarization state of the other light wave beam to be unchanged and using the other light wave beam as a reference light wave beam for the polarization shift keying modulated light wave beam; combining the polarization shift keying modulated light wave beam with the reference light wave beam, successively conducting power amplification, filtration and transmission, filtering carrier signals, converting into light current, then converting into light voltage and judging in a voltage comparator to obtain data corresponding to polarization shift keying modulation signals. By using the polarization shift keying demodulation method and the system, matched dynamic polarization control is not required during demodulation judgment at a receiving end, a transmitting end is not required to conduct differential encoding to the data and the complexity of the transmitting end is reduced; and a local light source is not required, the requirements on the accuracy and stability of a light path are reduced and the cost is saved.

The invention relates to a self coupled modular multilevel high-voltage DC-DC transformer and a control method thereof. An upper portion converter of the transformer adopts a full bridge sub module and half bridge sub module mixed modular multilevel one, a lower portion converter is a half bridge sub module type modular multilevel one, and energy interaction of the upper and lower portion converters is implemented in a self coupling manner. According to the determined alternate current transformer optimal rated transformation ratio and sub module selection principle, on the premise of maintaining the direct current failure isolating capability, the component requirements are lowered to the utmost extent, and the cost is reduced accordingly; on the basis of the precision feedback linear control strategy, the characteristics that the alternate current portion of a direct current transformer is free of power grid interference and system parameters can be measured accurately can be utilized completely, and the fine control performance is provided; by means of the fast direct current failure isolation, the direct current failure transmission and expansion of two direct current power grids can be prevented effectively; the transformer has the advantages that the transmission capacity is large, the direct current voltage level is high, and the transformer is adaptive to a high-voltage large capacity direct current power grid power conduction occasions.

The invention provides a polarization multiplexing direct detection system and a method. The transmission capacity of the system can be doubled. The system comprises a first polarization beam splitter used for dividing a light beam emitted by a laser into two orthogonal states of polarization, first and second intensity modulators used for modulating the intensity of two analog electrical signals on the two orthogonal states of polarization respectively, a polarization beam combiner used for synthesizing the signals after intensity modulation into a polarization multiplexing signal, a polarization maintaining coupler used for dividing the polarization multiplexing signal into two SOPs with a fixed angle therebetween under the cooperation of a 45-degree polarization rotator, second and third polarization beam splitters used for dividing each of the two SOPs into two orthogonal state-of-polarization signals, four photoelectric detectors used for converting the received four state-of-polarization signals into electrical signals, ad a digital signal processor used for estimating the polarization angles of the two SOPs, eliminating mixed polarization flap interference and carrying out polarization de-multiplexing and signal recovery. The system and the method of the invention are applicable to the technical field of optical communication.

The invention provides a coal mine tunnel roof stress online monitoring system based on a fiber grating sensor and a method thereof, and is suitable for the field of tunnel mine pressure monitoring. The coal mine tunnel roof stress online monitoring system based on the fiber grating sensor comprises monitoring and observation stations which are arranged on the roof of the tunnel of the two sides of a coal face. Each monitoring and observation station comprises three roof stress monitoring devices. The roof stress monitoring devices in each monitoring and observation station are connected in series together through communication optical fibers. The tail fiber of the lead-out end optical fiber of the monitoring and observation station of each tunnel tail end is connected with an optical fiber terminal box through the communication optical fiber. The optical fiber terminal box is connected with a fiber grating static demodulator arranged on the ground through a transmission optical cable for mining. The fiber grating static demodulator is connected with a monitoring computer and a network server in turn. The network server is connected with multiple client sides through a coal mine local area network. The coal mine tunnel roof stress online monitoring system is high in measurement accuracy and long in the service life so as to realize real-time online monitoring of the coal mine tunnel roof stress.

To provide a photoelectric composite wiring component combining both characteristics of low power consumption of transmission over electrical wiring and large transmission capacity of optical transmission over optical wiring, and exhibiting a high power efficiency for the transmission capacity. A mechanism for switching between transmission of a transmission signal over an electrical transmission path and that over an optical transmission path depending on the modulation rate or the transmission rate of the transmission signal is provided. When the modulation rate or the transmission rate of the transmission signal is low, power supply to an optical transmitting/receiving section is stopped and the signal is transmitted over the electrical transmission path, thus achieving low power consumption. When the modulation rate or the transmission rate of the transmission signal is high, the signal is transmitted over the optical transmission path, thus achieving a large transmission capacity.

The invention belongs to the photoelectronic technical field, and discloses an M-Z electrooptical modulator provided with tunable gratings and based on graphene-molybdenum disulfide heterojunctions. The M-Z electrooptical modulator comprises a substrate layer, the in-out tunable gratings, in-out straight-light waveguides, S-type bent Y-branch waveguides and a two-arm straight light waveguide, wherein the in-out tunable gratings, the in-out straight-light waveguides, the S-type bent Y-branch waveguides and the two-arm straight light waveguide are fully embedded in the substrate layer and successively connected with each other, and the two-arm straight light waveguide is successively provided with a second graphene layer, molybdenum disulfide and a first graphene layer from the bottom up; the second graphene layer is connected to a second electrode mounted between the two arms, and each in-out tunable grating is successively provided with a fourth graphene layer, a boron nitride isolation layer and a third graphene layer while the third and the fourth graphene layers are connected to the a fourth electrode and a fifth electrode respectively. Compared with the prior art, the M-Z electrooptical modulator has the advantages of being small in size, easy to integrate, deep in modulation, high in extinction ratio, big in temperature tolerance and the like.

The invention provides a multi-user precoding robust construction method under explicit delayed feedback, which is suitable for the multi-user parallel transmission based on the explicit feedback in a wireless multi-antenna transmission system. The method comprises the step that a base station researches all users serviced by the base station to obtain the mean motion speed of each user, computes the Doppler translation of each user according to the speed, computes the time-lapse related coefficient of each user according to a Clark scattering model, forms a delayed coefficient matrix, and substitutes the quantitative channel information fed back by a plurality of user sides and the obtained delayed coefficient matrix into a robust precoding construction formula provided by the method to obtain the precoding. The implementation process of the method in the practical application comprises the steps: 1) channel estimation; 2) delayed feedback; and 3) robustness precoding computation. The application efficiency can be higher if the precoding construction scheme provided by the method is adopted.

The invention provides a millimeter wave micropore coupler for measuring high power in the technology of heating nuclear fusion plasma large-power radio frequency wave. The millimeter wave micropore coupler comprises a coupler body of which the material is copper alloy or copper matrix composite and is provided with a reflecting surface, an input section and an output section which are arranged in the body, comprise base sections and are positioned at the two ends of the base section, a corrugated waveguide transmission line square bend which is integrally connected with the reflecting surface of the coupler, and a coupling hole which is used for communicating the base section of U-shaped waveguide with the inner cavity of the corrugated waveguide transmission line square bend. The millimeter wave micropore coupler is simple in structure, large in power capacity, little in insertion loss, flexible and convenient to use, and high in reliability; during measuring process, due to the power coupling method, the influence of the external environment on the measuring result can be avoided; and the millimeter wave micropore coupler has outstanding advantages on the aspect of measuring the millimeter wave band high power microwave, and can be widely applied to measuring transmission power of an ECRH (electron cyclotron resonance heating) system of which the transmission frequency is 138GHz-142GHz and the transmission power is megawatt.

The invention discloses a long-term monitoring apparatus for a soil pressure outside a duct piece of a shield tunnel. The long-term monitoring apparatus is composed of a fiber grating strain brick, a fiber grating temperature compensation block, a cable box, and an armored cable. The fiber grating strain brick consists of a measuring stone and a mortar layer coating the outside of the measuring stone; and four fiber gratings are arranged at each of three surfaces, being perpendicular to each other, of the measuring stone. The fiber grating temperature compensation block includes a hollow metallic cylinder and a temperature compensation stone arranged inside the metallic cylinder; the space between the temperature compensation stone and the metallic cylinder is filled with EVA foam; and four fiber gratings are arranged at each of three surfaces, being perpendicular to each other, of the temperature compensation stone. In addition, the invention also discloses a long-term monitoring method for a soil pressure outside a duct piece of a shield tunnel. Using the apparatus and method disclosed by the invention, the soil pressure monitoring error can be reduced; and the installation survival rate can be improved. Moreover, the apparatus and method have characteristics of good anti-electromagnetic-interference and corrosion-resistant performances and low signal attenuation; and the soil pressure outside a duct piece of a shield tunnel can be monitored accurately for long time.

The invention discloses a magnetic field coupling type and electric field coupling type-combined wireless electric energy transmission system. One output end of a high-frequency inverter circuit H isconnected with a first transmitting end polar plate through a transmitting end compensation capacitor CP, and the other output end of the high-frequency inverter circuit H is connected with a second transmitting end polar plate; the same-name end of a transmitting end coupling inductor LP is connected with the first transmitting end polar plate, and the different-name end of the transmitting end coupling inductor LP is connected with the second transmitting end polar plate; one input end of a rectifier circuit R is connected with a first receiving end polar plate through a receiving end compensation capacitor CS, and the other input end of the rectifier circuit R is connected with a second receiving end polar plate; the different-name end of a receiving end coupling inductor LS is connected with the first receiving end polar plate, and the same-name end of the receiving end coupling inductor LS is connected with the second receiving end polar plate; the second transmitting end polar plate is coupled to the second receiving end polar plate; and the transmitting end coupling inductor LP is coupled to the receiving end coupling inductor LS. The system has the advantages of increased transmission capacity, improved safety, structural simplicity, and improved utilization ratio of components.

The present invention provides a wireless fronthaul system for simulating optical transmission facing 5G power reuse. The system comprises a BBU pool, feed line fibers, a far-end mode, distributed fibers, a user terminal UE and a RRU unit. The BBU pool is connected with the far-end node through an optical line terminal via the feed line fibers, the output end of the far-end node is connected with the input end of the distributed fibers, the output end of the distributed fibers is connected with the RRU unit, and the output end of the RRU unit is sent to the user terminal UE through the antenna via an air interface. The wireless fronthaul system for simulating optical transmission facing 5G power reuse realizes the reuse of the simulation signals based on the subcarrier modulation at the signal power dimension so as to improve the spectral efficiency in the future mobile communication system and increase the transmission capacity. Besides, the wireless fronthaul system for simulating optical transmission facing 5G power reuse can distinguish different user data through the size of the superposed signal power and select the size of the power according to the distance from a user to the base station processing unit to realize the power reuse so as to solve the problem that the system performance is not balanced caused by the far and near effect of the wireless terminal access user.

The invention discloses a heavy truck curve anti-rollover early warning system, and the method comprises the following steps: 1) setting the heavy truck curve anti-rollover early warning system basedon dynamic monitoring, wherein the system comprises a measurement device, an early warning device, a man-machine cooperation device, and a cloud computing connection device; and 2) capturing information such as road gradient and width and obstacles around the vehicle by using a camera, calculating vehicle roll acceleration by combining a carriage roll angle measured by an inclinometer and curve curvature and centroid height measured by a cloud end, and speculating roll early warning time and an influence result of roll on adjacent vehicles; and 3) judging an early warning level according to the centroid offset distance, the wheel camber angle and the carriage inclination angle, enabling the early warning device to act, and combining a cloud computing result to adopt an early warning response scheme under a man-machine synergistic effect. Compared with the prior art, the system can more safely solve the problems of keeping the heavy truck advancing at a high speed and preventing the heavy truck from rolling sideways on a curve lane.

The invention discloses an information transmission encryption method based on combination of a national secret algorithm and a quantum communication technology. The method comprises the steps that: the encryption method is realized based on an optical communication network; a quantum key distribution device is arranged at the optical communication transmitting end; data transmitted by optical communication is subjected to quantum key encryption through the quantum key distribution device; furthermore, sender and receiver information of transmission information is subjected to national secretalgorithm encryption; sender address information decryption is carried out at first when a receiver decrypts the received information; and, a quantum key decryption channel is provided for transmission data decryption after sender information is decrypted. According to the method in the invention, transmission information encryption is carried out by adoption of the quantum key; the sender and thereceiver can perform secret communication; this is the first layer of encryption; furthermore, communication address information of the sender and the receiver is subjected to national secret algorithm encryption; stealing of local data after source data is tracked and the receiver receives information can be avoided; and thus, the secret information data transmission security is ensured better.

A fiber grating two-dimensional displacement monitor comprises a shell body and further comprises a first assembly and a second assembly. The first assembly is arranged outside the shell body, the second assembly is arranged inside the shell body. The second assembly is provided with cantilever beams where grating optical fibers are adhered. The fiber grating two-dimensional displacement monitor is buried in soil, by means of displacement changes of the first assembly, transformation of fiber grating of the second assembly is detected, and conditions of landslide, dam body deformation and roadbed settlement are measured. Therefore, the grating two-dimensional displacement monitor can carry out multi-point real-time monitoring in a long distance, can effectively reduce labor and material cost with remote real-time monitoring, can effectively avoid influences of weather or other human factors on monitoring, and intensifies reliability of measurement data.

In a reception system of a base station according to the communication system of a PDMA, CDMA and the like, the reception signals from a plurality of users received on a plurality of antennas are frequency-converted by a frequency conversion circuit, and then converted into digital signals by an A/D converter to be applied to a DSP. The signal of a particular user is extracted from the input signal by an adaptive array. Also, the interference user signal component is removed by an interference canceller. Accordingly, the signal component of a desired user having the interference component caused by an unrequired user signal suppressed is output. Thus, the communication quality in a radio communication system such as a mobile communication system can be improved.