95results about How to "Solve co-channel interference" patented technology

The invention discloses an underground coal mine WiFi (Wireless Fidelity) staff positioning system and positioning method based on TOA (Time of Arrival), belonging to the field of coal mine monitoring and communicating. An underground staff positioning module is a system structure adopting a WiFi integrated communication base station, a WiFi positioning substation and a WiFi staff positioning card. Signal transmission time between the staff positioning card and the communication base station and between the staff positioning card and the positioning substation is measured by one wired signal medium and two WiFi signal media, and an accurate distance value is obtained by calculating a hold-down timing error; and the position of the staff is obtained by utilizing the covering direction of a positioning antenna for receiving the signal, so that the accurate positioning of the location of the coal mine underground staff is realized. The underground coal mine WiFi staff positioning system is integrated to a coal mine underground WiFi integrated communication system for realizing the accurate positioning of the mine coal underground staff on the condition of not increasing the quantity and density of the devices, thereby realizing improving the positioning accuracy of the staff by the existing coal mine underground staff positioning system and solving a problem that the communication system is managed in a split manner.

A method for avoiding co-channel interference of a polar orbit constellation by using phased array beam reconstruction, including: calculating an average coverage multiplicity at different latitudes;determining a minimum average coverage multiplicity that ensures continuous coverage conditions; according to a polar orbit constellation operation law and a satellite beam strategy, calculating a maximum average coverage multiplicity of a satellite on which overlapping of same frequency beams does not occur; according to a latitude range in which the satellite is operating, determining a ground coverage beam used by the satellite in different latitude ranges; and according to the determined ground coverage beam used by the satellite in different beam ranges, generating a control strategy thatis on the ground coverage beam and that is performed by a phased array antenna during satellite operation, and automatically performing, by the polar orbit constellation, beam control of the phased array antenna according to a latitude of a sub-satellite point of the satellite and in accordance with the control strategy that is on the ground coverage beam and that is performed by the phased arrayantenna, so that overlapping of the same frequency beams does not occur in a high latitude area under the condition of ensuring continuous coverage, thereby avoiding the co-channel interference between the same frequency beams.

The embodiment of the invention provides a method and device for cell interference coordination. The method for the cell interference coordination comprises the steps that a first base station generates interference coordination information which comprises relative narrow-band transmitted power threshold value information corresponding to wireless resources of a designated dimension, wherein the designated dimension comprises at least one of time or frequency or space; the first base station sends interference coordination information to a second base station to enable the second base station to determine an interference coordination strategy according to the interference coordination information, and interference, on the same secondary band, of the first base station and the second base station is reduced. The method and device enables the base stations to determine the interference coordination strategy according to the interference coordination information sent by adjacent base stations, the interference, on the same secondary band, of a base station and an adjacent base station is reduced, and therefore the problem of same frequency interference in an LTE network deployment scene is resolved.

The invention discloses an antenna mutual-coupling elimination device and method and a wire communication device. The antenna mutual-coupling elimination device comprises an interference elimination circuit, wherein the interference elimination circuit is arranged between a pair of coupling antennas, and the interference elimination circuit and a matching circuit of the antenna form a decoupling network. In the antenna mutual-coupling elimination device, the decoupling network jointly formed from the interference elimination circuit and the matching circuit can be used for effectively reducing interference and influence caused by antenna coupling, the antenna radiation efficiency is improved, a far-field pattern of the antenna is changed, the spatial correlation of the antenna is reduced, the demands of a new-generation wireless communication system on channel capacity, data throughput rate and reliability are met, and the spectrum efficiency utilization ratio of the communication system can be improved. Meanwhile, the coupling elimination technology can be suitable for various types of multi-antenna wireless communication terminals, base stations, phased array radars, transceivering assemblies and other communication systems.

The invention discloses a method for receiving and sending mobile equipment signals. At least two directed receiving and sending channels covering different space ranges are arranged in mobile equipment; the directed receiving and sending channels are combined to jointly cover the omnibearing receiving and sending range of the mobile equipment; on the basis of the directed receiving and sending channels, cell search and serving cell selection are carried out by the mobile equipment to select one serving cell for residence; each directed receiving and sending channel independently monitors the quality of signals of all cells by taking preset channel selection time as a period; at least one directed receiving and sending channel with the best quality of the signal of the serving cell is selected to serve as an activated channel; and the signal is received and sent on the basis of the activated channel. In the method disclosed by the invention, same-frequency interference radiation intensity and a Doppler frequency shift hopping range are successfully lowered by spatial subdivision, the severe technical difficulties of same-frequency interference, resonance offset of high-speed rail scene signals, dramatic hopping for Doppler frequency shift and the like of the mobile equipment side in a commercial network are effectively solved, and the performance representation of the mobile equipment is obviously improved.

The invention discloses a method for reducing antenna mutual interference in a wireless device and the wireless device. The wireless device comprises a first antenna and a second antenna, wherein a decoupling circuit is arranged between the first antenna and the second antenna, and the decoupling circuit is matched with the first antenna and the second antenna to form a decoupling network. According to the method and the wireless device, isolation between antennas is effectively improved, the objective problem of co-channel interference between antennas in long term evolution (LTE) products at present is solved, and the miniaturized layout requirement for terminal products such as data cards and mobile phones is satisfied simultaneously.

The invention discloses a planning method and a planning device for frequency points, relates to the technical field of communication networks, and is used for solving the problem about adjacent channel interference of signals in a WCDMA network and a GSM network in a refarming-WCDMA network. The planning method comprises: determining an interference frequency point set and a core interference base station set, then obtaining a target base station set from the core interference base station set for deploying frequency points in the interference frequency point set, replacing the interference frequency points respectively corresponding to each target base station in the target base station set with the frequency points, which have not interfered WCDMA signals in a refarming-WCDMA network deployment area, in the refarming-WCDMA network deployment area and buffering area. The planning method and device for the frequency points provided by the embodiment of the invention are applicable to planning the frequency points.

The invention provides a frequency point switching method and an apparatus thereof. In a network, a same-frequency interference at a boundary of a shared network area and a non-shared network area is high. By using the method and the apparatus of the invention, the above problem is solved. The frequency point switching method comprises the following steps that when user equipment enters into a preset frequency point priority switching band, according to a frequency point priority which is preset in the frequency point priority switching band, a frequency point used by the user equipment to carry out switching is triggered; and the frequency point priority switching band is arranged in the shared network area which has a preset distance with the non-shared network area. By using the scheme of the invention, a same-frequency interference problem of the user equipment which moves towards the non-shared network area from the shared network area is avoided.

The invention discloses a radar anti-same-frequency-interference method and device. The radar anti-same-frequency-interference method comprises the steps that step 1, a filtering circuit decreases thepower difference between a high frequency part and a low frequency part in a baseband signal and filters a baseband out-of-band signal in the baseband signal; step 2, a signal processing unit automatically adjusts the amplification gain of an automatic gain amplification circuit according to an echo signal received by a receiving antenna; step 3, the signal processing unit changes the frequency of a radio-frequency signal generated by a signal generating unit randomly; and step 4, the signal processing unit filters a same-frequency interference signal through a target tracking method. The problem of same-frequency interference between radars is solved.

The invention discloses a method for achieving dynamic frequency reuse under cloud wireless access network architecture. The method is characterized by being suitable for a full-frequency-band orthogonal frequency division multiplexing system. The cloud wireless access network architecture comprises a far-end radio-frequency head, a base station resource pool and a high-speed switching fabric. The base station resource pool comprises a base-band processing unit and a central management and scheduling module. The central management and scheduling module is used for distributing frequency resources to users in the central zone and marginal zone of each cell covered by a system respectively according to the service load of different zones of the cell, wherein when the frequency resources are distributed to the users in the marginal zone of each cell, a method based on graph coloring is adopted so as to guarantee that same frequency interference between the marginal zones of two adjacent cells can not occur and the utilization ratio of high-frequency-spectrum resources can be further improved. Compared with an existing cellular system, operation and maintenance cost can be effectively reduced, same frequency interference between the cells can be avoided, the utilization ratio of the high-frequency-spectrum resources can be improved, and the throughput of each cell can be improved.

The disclosed MBMS system with UTN in TD-SCDMA comprises: a wireless network controller, which sends UTN configuration message to UE to configure a UTN code for every time slot and the SCCPCH for node, and configures UTN code for node; a node B building SCCPCH channel with last controller and interfering the MBMS data to transmit; and UE receiving MBMS data according to the received UTN message. This invention avoids same frequency interference of near subzones.

A method for half duplex digital communication relay with same frequency dual time slot comprises a transmitting terminal A and a receiving terminal B communicating at least in the same frequency, a transmitting terminal C and a receiving terminal D, a base station, a transmitting terminal A and a transmitting terminal C applying for an idle time slot and alternately transmitting a first radio signal and a second radio signal; When the receiving terminal B or the receiving terminal D simultaneously receives the first radio signal and the second radio signal, the receiving terminal B or the receiving terminal D transmits a delay signal to the transmitting terminal A or the transmitting terminal C through the base station, The transmitting terminal A or the transmitting terminal C applies for two consecutive idle time slots and transmits the radio signal again, and the receiving terminal B or the receiving terminal D continues to receive the radio signal in one time slot and forwards thesecond radio signal or the first radio signal in the other time slot. The method of the invention enables each terminal to act as a relay in the same frequency, and transmits communication information of a previous terminal for another terminal, thereby saving frequency resources.

The invention discloses a digital dual-mode train tail system based on wireless communication, which comprises a train tail locomotive platform installed on a locomotive and a train tail main engine installed on the train tail. The train tail locomotive platform comprises a main engine, an antenna respectively connected with the main engine, a train tail control box and a control cable. The main engine comprises a power supply unit, a recording unit, a communication unit and a main control unit of the train tail locomotive platform. The main control unit of the train tail locomotive platform is respectively connected with the recording unit and the communication unit through an RS232 interface, and the communication unit comprises a GSM-R module, a 400 MHz digital channel machine and a combiner,The input ends of the R module and the 400MHz digital channel machine are connected with the main control unit of train tail locomotive platform respectively, and the combiner is connected withan antenna. The invention solves the weak field problem of mountain tunnel communication, saves the investment of the mobile repeater and the interval relay equipment, solves the problem of the same frequency interference, improves the operation efficiency of the train tail, and reduces the overall transportation cost.

The invention provides a hydraulic support remote control method and a system. The method comprises the steps as follows: transmitting command information through an emitter; receiving the command information through a receiver which has the same wireless communication frequency as the emitter; decoding the received command information through the receiver, and judging whether the ID number of a controller in the received command information is in the preset ID receiving range, if so, storing the decoded command information, if not, abandoning the command information. With the adoption of the hydraulic support remote control method and the system, the problem of same frequency interference can be effectively avoided; and the operation is convenient and safe.

The invention relates to the field of high-altitude meteorological detection, in particular to an L-band narrow-band electronic sonde, which is characterized by comprising a sensor module, a receivingmodule and a transmitting module, the transmitting module comprises a single-chip microcomputer control system, a multifunctional radio frequency module, a filter, a two-stage microwave switch, a two-stage high-frequency amplifier and a one-stage power amplifier. Sounding data of the sensor module and a pulse signal transmitted by the receiving module are input into the single-chip microcomputercontrol system; the single-chip microcomputer control system adopts a time-sharing working mode, divides unit time into three time periods and outputs sounding code signals, ranging signals and anglemeasurement signals respectively, and the signal characteristics are frequency modulation signals, pulse modulation signals and continuous wave signals respectively. According to the invention, a frequency modulation and amplitude modulation mixed system is adopted to solve the defects that the current amplitude modulation system sonde occupies a wide frequency band and the frequency modulation system sonde cannot measure the distance, and the requirement that meteorological frequency band spectrum resources occupy the bandwidth is met; and a time division working mode is adopted to solve same-frequency interference, and stability and reliability are achieved.

The invention discloses a double-radio-frequency multi-frequency-point wireless system which comprises a main control MCU, a module MCU, radio frequency 1, radio frequency 2 as well as three working frequency points, that is, a receiving frequency point 1, a receiving frequency point 2 and a transmitting frequency point, wherein three parameters of the defaulted receiving frequency point 1, the receiving frequency point 2 and the transmitting frequency point are stored in the main control MCU when the double-radio-frequency multi-frequency-point wireless system is delivered; when the double-radio-frequency multi-frequency-point wireless system is electrified, the main control MCU automatically transmits two receiving frequency points and one transmitting frequency point used at present to the module MCU, so that the module MCU can configure the two radio frequencies according to the received parameters; when the double-radio-frequency multi-frequency-point wireless system works, the module MCU can automatically change the radio frequency working frequency points according to received instructions so as to avoid external interference. Therefore, the technical effects that the system throughput rate is increased, the system response time is shortened, the same frequency interference is avoided, and the frequency points can be automatically changed to avoid the interference when being interfered are achieved.

The invention discloses a frequency modulation method for an engineering machinery wireless remote controller. The method comprises: S1. presetting multiple channels for signal transmission; S2. before signal transmitting, letting an emitter intercept the state of a first channel; S3. if the first channel is occupied, making the emitter abandon the channel and continue to intercept the state of a next channel till that an idle channel is intercepted or the emitter finds that all the channels are occupied; S4. if the emitter intercepts an idle channel, letting the emitter start to emit signals to a receiver by the intercepted idle channel; and S5. if all the channels are occupied, interrupting triggering, setting the waiting time T of the emitter, and then repeating S2. The method provided in the invention solves the same frequency interference problem of a remote controller system, and ensures reliability and convenience of an engineering machinery wireless remote controller system.

The invention discloses a limited network state maintenance method, which comprises the steps of acquiring the access state information of a user terminal; determining the target state of a limited network according to the access state information, and adjusting the corresponding state. The invention further provides a limited network state maintenance system and equipment thereof. By adopting the system and the equipment, the state can be adjusted according to the access state information of the user terminal, thus preventing the limited network from working for a long term when no user terminal is accessed, saving resources, and effectively solving the problem of same frequency interference between the limited network and a public network, and the problem of same frequency interference between the limited networks.

The invention discloses a base station of a world interoperability for microwave access (WiMAX) system and a frequency reusing method for the WiMAX system. The WiMAX system adopts a time-frequency way. The method comprises the following steps of: dividing a downlink frame of the base station into an outer-ring area and an inner-ring area, wherein the inner-ring area carries management control messages or user data for inner-ring users, and the outer-ring area carries management control messages or user data for outer-ring users and broadcast messages for the outer-ring and inner-ring users; and adopting different orthogonal frequency division multiplexing (OFDM) sub-carrier sets for different sections of the base station by using the outer-ring area. By the base station and the method, same frequency interference can be effectively reduced, and frequency spectrum utilization rate can be increased.

The present invention provides a design method of L-band SAR (synthetic aperture radar) satellite and navigation receiver anti-co-channel interference. According to the design method, an electronic microwave switch which works in a linkage manner with SAR pulse signals is additionally installed on a navigation receiver so as to suppress co-channel interference; the microwave switch is mainly used for isolating co-channel interference signals which are generated by an SAR load at the frequency point of the navigation receiver, the impulse power of the SAR load being higher than one kilowatt; the switching on and switching off of the microwave switch are controlled through timing signals generated by an SAR sub-system; compared with PRF (pulse repetition frequency) signals transmitted and received by the SAR sub-system, the timing signals are broadened; and the microwave switch is built in the navigation receiver in an integrated manner. With the design method adopted, the problem of the co-channel interference of an L-band SAR load and a global satellite navigation system can be solved, and the design of the SAR load is more free, navigation accuracy is ensured, and after-event processing is relatively simple.

The invention discloses a multi-frequency-point positioning data returning system and a method thereof. The positioning data returning system comprises a plurality of returning data broadcasting stations, and a returning data receiver is arranged on a to-be-positioned device. Each backhaul data broadcasting station sends position information to the backhaul data receiver by using different frequency points, so that the problem of same-frequency interference of overlapped parts of coverage areas of a plurality of broadcasting stations is solved. Besides, each return data broadcasting station can send a positioning data packet to the return data receiver at the same time through the return data synchronizer, so that the multi-frequency-point positioning data return system can set a receivingtime period for the return data receiver, and the same positioning data packet of different broadcast frequency points can be received in a specific receiving time period. Meanwhile, the backhaul data receiver scans which frequency point signal is the strongest, so that another receiving channel is locked to the frequency point, the optimal selection of the receiving frequency point is realized,in addition, an independent receiving channel does not need to be arranged for each frequency point, and the hardware cost is saved.

The invention, which relates to the field of wireless communication, discloses a method, apparatus and system for dividing a cofrequency interference protection band. The method comprises: a plurality of base stations are classified into re-farming-region base stations and non-re-farming-region base stations; measurement results of pilot-frequency signal measurement on signals of deployed networks of the non-re-farming-region base stations by terminals of a whole network under the re-farming-region base stations are obtained, wherein the signals of the deployed networks of the non-re-farming-region base stations have the same frequencies as those of re-farming networks of the re-farming-region base stations and the signals of the deployed networks of the non-re-farming-region base stations and the signals of the deployed networks of the re-farming-region base stations are in a pilot-frequency state; and according to a statistic situation of the measurement results of the terminals of the whole network, base stations with the pilot-frequency interference larger than a preset degree among the re-farming-region base stations are determined as non-re-farming cofrequency interference protection band base stations. According to the cofrequency interference protection band dividing method realized based on pilot-frequency measurement information reported by whole-network terminal users, the potential cofrequency interference area is reflected accurately; and while the network topological structure design is carried out during the network planning period, the cofrequency interference problem is solved.

The invention discloses a method and system for eliminating same-frequency interference in phase coding. The system comprises a transmitting system, a receiving system, a waveform generating unit with a phase shifting function, a digital intermediate-frequency receiver, a signal processing unit, a data acquisition machine and a terminal. The waveform generating unit with the phase shifting function generates transmission excitation signals with different phases each time and outputs the signals to the transmitting system; the signals are transmitted by an antenna to the space; the digital intermediate-frequency receiver receives an echo signal received by the antenna and a dominant wave signal coupled by a transmitter; a corresponding digital filter processes the signals to obtain zero-intermediate-frequency IQ signals and the zero-intermediate-frequency IQ signals are outputted to the signal processing unit; the signal processing unit receives the two paths of zero-intermediate-frequency IQ signals outputted by the digital intermediate frequency to carry out coherent processing and signal quality threshold processing and transmits the processed results to the data acquisition machine and the terminal for data acquisition. Therefore, a problem of same-frequency interference in weather radar detection can be solved.

The invention discloses a mobile terminal and a communication network connection method. The mobile terminal comprises more than two SIM card slots, a micro-control chip which includes a bus module and an SIM card communication module, and an analogue switch chip which is respectively connected with the bus module and the SIM card communication module of the micro-control chip; and the analogue switch chip is also used for realizing electrical connection between the SIM card communication module and one SIM card slot. The mobile terminal and the communication network connection method can be used for realizing low-cost multi-card multi-standby.

The invention discloses a vehicle-mounted terminal and smart phone interconnection and interaction virtual Bluetooth system which comprises a smart phone and a vehicle-mounted terminal with a voice receiving module, a voice processing module and a data transmission module. The vehicle-mounted terminal is in communication connection with the smart phone through the data transmission module. When the smart phone needs calling, the vehicle-mounted terminal receives voice information through the voice receiving module, and the voice information after being processed through the voice processing module is transmitted to the smart phone in realtime by utilizing the data transmission module. The voice information is received through the vehicle-mounted terminal and transmitted to the smart phone when the smart phone calls, so that a virtual Bluetooth function is realized; the smart phone can be matched with the vehicle-mounted terminal to realize a hands-free calling function, so that traveling safety is guaranteed, the problem of same-frequency interference when WIFI and Bluetooth are used at the same time is avoided effectively, calling quality is improved, and higher practicability and better user experience are realized.

The invention relates to a fiber power broadband access system. The fiber power broadband access system comprises multiple fiber signal and power line signal conversion modules, user end equipment connected with a first communication end of each fiber signal and power line signal conversion module, and a server, a light line terminal and a light distribution network which are connected sequentially, wherein the light distribution network is connected with second communication ends of the multiple fiber signal and power line signal conversion modules. The fiber power broadband access system realizes physical layer channel distribution in multi-user broadband power line communication, solves problems of co-frequency interference and cross-frequency interference among different users, so operation of the broadband power line communication can be really realized. The fiber power broadband access system can facilitate four-network fusion, can further expand intelligent household application and has great business values and cost performance.

The present invention relates to a square double-notch ultra wide-band antenna with spiral resonators. The antenna comprises a dielectric substrate (1), a radiation element (2), spiral ring resonators (3), a coplanar waveguide signal feed strip line (4) and coplanar waveguide ground planes (5). The radiation element, the spiral ring resonators, the coplanar waveguide signal feed strip line and the coplanar waveguide ground planes are printed at the upper surface of the dielectric substrate; the radiation element is in square-shaped and located at the middle portion of the dielectric substrate; the coplanar waveguide signal feed strip line clings to the edge of the dielectric substrate and is connected with the radiation element; there are two pieces of coplanar waveguide ground planes which are respectively fixed at two sides of the coplanar waveguide signal feed strip line, and there is a gap between each coplanar waveguide ground plane and a microstrip line; and the two spiral ring resonators are located at two sides of the radiation element, and there is a certain gap between each spiral ring resonator and the radiation element. The two spiral ring resonators are arranged at two sides of the radiation element to realize the notch performance without degradation of the ultra wide-band antenna performance, and the square double-notch ultra wide-band antenna with the U-shaped groove is compact in structure and tiny in size, has reliability and simplicity, can regulate notch frequency, solves the problem of the same frequency interference of the ultra wide-band communication system and has a high practical value.

The invention discloses a multipurpose shield tunneling machine vacuum suction cup segment splicing remote-control system which comprises a transmitter, a control main board, a receiver and a shell. The transmitter and the control main board are connected and located in the shell, and the receiver is mounted on a shield tunneling machine and used for receiving an instruction transmitted by a receiver matched with the receiver. The receiver is mounted on target equipment, a modular connecting-inserting structure is adopted, expansion and upgrading are facilitated, intelligent adjusting can be conducted on outputting, the multipurpose shield tunneling machine vacuum suction cup segment splicing remote-control system is suitable for various types of output control, and maintenance is convenient; mounting is concise and rapid, and the mounting and debugging time of the equipment is shortened greatly; by setting the output control types of the receiver, a control system can control different equipment comprising a shield tunneling machine vacuum suction cup snatch disc and a shield tunneling machine mechanical-type snatch disc; and wireless communication data of the system are transmitted through a security encryption mode, when same frequency interference exists, the using frequency of the remote-control system can be changed, and thus normal working of the remote-control system isensured.