202results about How to "Avoid co-channel interference" patented technology

Methods and systems for configuring an access point (AP) are provided. According to one embodiment, a dual radio AP includes: two radios, a first operating at 2.4 GigaHertz (GHz) or 5 GHz and a second operating at 5 GHz; first and second directional antennas coupled to the first and second radios, respectively; first and second transmit queues buffering packets for transmission by the first and second radios, respectively; a location determination module configured to compute locations of recipient devices of the packets; a direction identification module configured to calculate angles to direct the directional antennas based on the computed locations; an interference detection module configured to determine whether interference would take place if the packets are transmitted based on the calculated angles and estimated timing of transmission; and a transmission module configured to transmit the packets without interference between the directional antennas by rescheduling packets if necessary.

The invention discloses an interference suppression method, interacting the interference suppression information by each cell base station and a main control module; the main control module obtains the main interference terminal information of each cell; the main control module aggregates the interference terminal information of each cell, or can add loading information, recommends an interference suppression dispatching method, sends to the corresponding cell base station; each cell base station combines with the dispatching requirement of the cell to dispatch according to the interference suppression dispatching method recommended by the main control module, to reach the aim of restraining or eliminating synchronous interference. The interference suppression method provided by the invention can reduce the co-channel interference in the wireless communication system effectively, improve the spectrum efficiency and further increase system coverage and flow rate.

The remote intelligent meter reading system of the present invention includes a database server, a data service center, an operation terminal, a concentrator, a collector and a client terminal, and one concentrator can be connected with multiple collectors; the concentrator receives various Effective command and responding to the command, send various operating information of the client to the concentrator, and the energy client includes a gas meter, a water meter or an electric meter. The remote intelligent meter reading system of the present invention integrates non-electric power detection technology, microelectronic control technology, radio technology, wireless digital transmission technology, computer network technology, information security technology and software technology and is independent of water, electricity and gas backbone networks. The extraction and data management of measurement data information of measuring instruments has improved the information management level of the industry.

The invention discloses a multi-target tracking and positioning system for an indoor parking lot, and belongs to the field of multi-target tracking and positioning. The system comprises a UWB positioning system and a vehicle body positioning device, the UWB positioning system comprises a wireless synchronous controller and a wireless positioning base station, and the vehicle body positioning device comprises a vehicle body positioning label, an inertia navigation module, a wireless module and a portable power source module; the data output by the inertia navigation module are sent to an upper computer system through the wireless module, meanwhile, the vehicle body positioning label sends a signal to the wireless positioning base station, the wireless positioning base station transmits the data to the wireless synchronous controller, the wireless synchronous controller sends the signal to an upper computer, and the upper computer system obtains target position data and posture data, determines specific vehicle body position and posture information through fusion operation and sends the information to a mobile client. The combined positioning system breaks through a positioning mode limited by environments in the prior art, and improvement in the aspects of spatiality, real-time performance, quantitative performance and precision is achieved.

The invention discloses an access method in a same frequency network with N frequency points, which comprises the following steps: in each district, prearranging a large circle covered carrier wave which continuously covers a whole network and a small circle covered carrier wave which only covers a central area of the district, wherein the large circle covered carrier waves of adjacent districts are different, and each large circle covered carrier wave comprises a main carrier wave of the district; in the terminal access process, when a base station in the district where the terminal is positioned confirms that the terminal is positioned in the central area of the district, accessing the terminal into the small circle covered carrier wave of the district; and when the base station confirmsthat the terminal is positioned in a marginal area of the district, accessing the terminal into the large circle covered carrier wave of the district. By applying the access method, same frequency interference at district boundaries can be avoided.

The invention discloses a method and a device for trunking service transmission, which are used for realizing trunking transmission in a broadcasting manner and improving performance of trunking transmission while overcoming co-channel interference. The method for trunking service transmission includes that an evolved node base (eNB) informs user equipment (UE) of pre-configured resource information of a trunking multicast control channel (T-MCCH); and the eNB sends the T-MCCH on the pre-configured resources of the T-MCCH when required, wherein the pre-configured resources of the T-MCCH are periodical.

An information channel and power combined self-configuration method for APs (Access Points) in wireless local area network comprises the steps as follows: the area where the APs to be configured are located is selected as a local network, and the local network is divided into a plurality of grids according to practical conditions; each AP sends out a self-configuration request to a server and simultaneously reports the position coordinate of the AP and the scanned frequency spectrum use information of the ambient environment of the AP; the server analyzes the positions and the ambient environments of the APs according to the self-configuration requests of the APs, and allocates information channels and power parameters to the APs to be configured in combination with the use conditions of AP information channels in neighbor cells under the premises of meeting the coverage rate requirement and minimizing same frequency interference, that is, first the signal energy of each grid is estimated according to a path loss empirical model to learn the network coverage condition, and then the information channel and the power parameter eventually configured for each AP is obtained through calculation based on the principle that the energy efficiency ratio is highest, and are sent to the AP to be configured. The method provided by the invention is quick and effective, guarantees the region coverage requirement, avoids same frequency interference to the maximum extent and guarantees that the energy efficiency ratio of the network is highest.

The related realization method for frequency multiplexing in some subzones comprises: dividing resource in wireless communication system into some sub-frequency bands, setting time unit to occupy sub-frequency band for every subzone; and allocating sub band for wireless communication business. This invention avoids same frequency interference efficiently, and can obtain full-band frequency diversity.

The invention provides a camera module control method and device based on a WIFI (Wireless Fidelity) network. The method comprises the steps of detecting whether a master MIPI (Mobile Industry Processor Interface) frequency employed by a currently working camera module carries out co-channel interference on a WIFI channel or not when it is detected that terminal equipment in the WIFI network starts a camera function and it is determined that an application scene of the camera function belongs to a video communication scene, starting a frequency hopping mechanism when it is detected that a channel of the master MIPI frequency carrying out the co-channel interference on the WIFI channel is a video communication channel of the application scene, and controlling the camera module to switch toa preset backup MIPI frequency. Under the condition of not influencing a video, the master MIPI frequency is hopped to a frequency which is not overlapped with a WIFI frequency, the co-channel interference of the camera module on a WIFI antenna in the video communication scene under the WIFI of a user is solved, and the hardware cost is reduced.

The invention discloses a method for restraining the interferences of group networks with the same frequency by modulating. The method comprises the steps that potential interference conditions of each user in a local cell to other cells are obtained by each cell; ordering or classification is carried out to the users by each cell according to the potential interference conditions; modulation is carried out to each cell according to the ordering or the classification to crossly distribute the users with high potential interference conditions in the time-frequency resource space of the same system of the local cell and other cells. The method provided by the invention can effectively reduce the interference of the same frequency in a wireless communication system and improve frequency spectrum efficiency, thereby further increasing the coverage and the flow of the system.

The invention discloses a method for detecting an illegal AP (Assembly Program) under a centralized WLAN (Wireless Local Area Network) environment and relates to a wireless intrusion detection technique. An AP device and an illegal AP device are adopted in the method; an AC (Automatic Control) device is arranged; the AC device is a wireless controller used for managing the AP, establishing a WLAN and detecting the illegal AP; the AC device comprises a WLAN establishing module, a binary recording module, an illegal AP identifying module, a collecting module and a wireless scanning module which are interacted in turn; the binary recording module is interacted with the AP device; and the wireless scanning module is respectively interacted with the AP device and the illegal AP device. The method can be easily realized; a physical position of the illegal AP can be accurately positioned; the illegal AP in a space can be effectively found; same frequency interference or adjacent frequency interference between the illegal AP and legal AP is avoided; and the method is suitable for the WLAN under various complex networking environments, is free from being restricted by space and field as well as time and weather and can be implemented under any environment.

The invention discloses a method and a system for pre-treating downlink transmission in cooperative communication; wherein, the method comprises the following steps: the master nodes confirm whether the combined treatment procedure among the cooperative nodes or the coordinated scheduling procedure in the master nodes is adopted; in the combined treatment procedure among the cooperative nodes, each cooperative node acquires the pre-coded array among the nodes, and pre-codes a plurality of downlink data streams, which are sent from each cooperative node to user equipment, among the nodes by using the pre-coded array among the nodes; in the coordinated scheduling procedure in the master nodes, the master node acquires the pre-coded array in the nodes, and pre-codes a plurality of downlink data streams, which are sent from the master nodes to user equipment, in the nodes by using the pre-coded array in the nodes. The invention can eliminate the correlation of MIMO (Multiple Input Multiple Output) channels by acquiring the pre-coded array, so that the downlink data streams can be adapted to the downlink channel conditions, and the performance gain of a downlink joint transmission useror a coordinated scheduling user can be improved.

The invention relates to a method for evading co-channel interference through deflection antenna pointing and a satellite communication system. The method comprises the following steps: arranging morethan one space-borne antenna on an NGEO communication satellite; determining a constellation configuration of the NGEO satellite communication system, and ground user type and distribution, and selecting variables to describe the normal orientation of the space-borne antenna of the NGEO satellite communication system; according to an interference protection regulation for the GEO satellite systemof ITU, selecting a group of indexes alpha for balancing the interference degree of the satellite communication system to the GEO satellite system; determining a group of indexes beta for balancing link quality of the satellite communication system; establishing a nonlinear optimization model of the normal orientation of the phased array antenna according to the indexes alpha and the indexes beta; and solving optimal variables through iterations and outputting a set of optimal phased array antenna deflection pointing setting scheme. The method for evading co-channel interference through deflection antenna pointing and the satellite communication system in the present invention ensure own communication link quality and reliability requirements, so that the satellite system can coexist effectively with the GEO satellite system at the same frequency.

The invention provides a dual wireless communication device. The dual wireless communication device comprises a first antenna, a second antenna, a first wireless communication module, a second wireless communication module, a processor and an isolating circuit for isolating the first antenna from the second antenna. The first wireless communication module is electrically connected to the first antenna and used for generating a first radiation signal, while the second wireless communication module is electrically connected to the second antenna and used for generating a second radiation signal. The isolating circuit comprises a coupling unit, a phase adjustment unit, an adjustable attenuation unit, and is used for performing phase adjustment and signal attenuation on the first radiation signal and the second radiation signal. The processor is electrically connected to the first wireless communication module, the second wireless communication module and the adjustable attenuation unit, and used for calculating the isolation degree of the first antenna and the second antenna and comparing the calculated value with a preset value so as to adjust the attenuation degree of the adjustable attenuation unit according to a comparison result. The dual wireless communication device is capable of increasing the isolation degree between two antennas and preventing the same frequency interference generated by the dual wireless communication device.

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.

A method for improving distributed resource allocation in OFDMA based wireless communication networks such as WiMAX IEEE 802.16 for either fixed or mobile subscriber stations SSs is executed by neighbor Base Stations BSs serving the SSs. Each BS controls the allocation of respective permutation zones and radio resources encompassing different radio subchannels within each permutation zone. In this task the BS avails of RRM primitives and instances of a NCMS functionality promoting direct BS-to-BS communication, which can be exploited in a distributed RRM profile. A BS playing the role of RRC sends to Neighbor BSs a unique RRM Request for receiving event-driven Spare Capacity Reports. Among driving events, “Change of Radio Resources Allocation” is included. Neighbor BSs, at every allocation change is detected, send to the requester BS a Spare Capacity Report including a Bitmap indicating subchannels used for transmission in each Permutation Zone. In order to eliminate Co-Channel Interference CCI, the requester BS avoids using same subchannels already indicated in the received Bitmap.

The invention provides a heterogeneous network control method and a base station. The control method includes the steps that when terminals meet resident conditions, a micro base station sends resident permission instructions to the terminals so as to enable the terminals to reside in the micro base station; the micro base station receives service requests sent by the terminals and distributes wireless resources unoccupied by a macro base station to the terminals according to the types of the service requests. The main reason that users of the macro base station interfere the micro base station is that the users of the macro base station and users of the micro base station occupy the same wireless resources, and therefore the wireless resources distributed to the terminals by the micro base station are the wireless resources unoccupied by the macro base station, the problem of co-channel interference is avoided, and the resource utilization rate of the macro base station will not be influenced.

The invention provides a random access method using a Zadoff-Chu (ZC) sequence as a preamble. The method comprises the following steps that: A. a base station uses a root parameter u to generate the ZC sequence with a length of NZC, wherein n is greater than or equal to 0 and less than or equal to NZC-1; B. the base station selects the parameter v according to a cell position, wherein the v is greater than or equal to 0 and less than or equal to N-1, the parameter v of the adjacent cell is not the same and N is a number of a cyclic shift sequence; C. the base station of the cell v calculates a cycle shift amount of the cell, wherein N<shift>CS is the initial position of the cyclic shift and NCS is cyclic shift interval amount; D. the base station of the cell v issues the cyclic shift amount of the cell to a terminal of the cell; E. the terminal initiates the random access after setting the initial position of the terminal itself ZC sequence which is taken as the random access preamble according to the received cyclic shift amount. The invention also provides a random access realization apparatus using the ZC sequence as the preamble and a system thereof.

The invention relates to a satellite constellation implementation method for implementing communication by utilizing a recursive orbit, and the method comprises the steps: a regression period, an orbital semi-major axis, an inclination of an orbit, an eccentricity ratio and an argument of perigee of the orbit are determined; the number of satellites and orbital planes are determined as n; right ascension of ascending node and a mean anomaly of a first satellite are determined, and according to service needs of the satellite, right ascension of ascending node and mean anomaly of following satellites are determined in sequence; a geostationary orbiting satellite network set that needs to be coordinated and the width of a non-geostationary satellite to geostationary satellite interference protection band are determined; all set satellites successively passes the top in the air along a same fixed orbit are seen at any position of the ground, and when multi-coverage is formed, users on theground can see a plurality of satellites; and if satellite trails pass the interference protection band for the geostationary satellite, when present accessed satellite enters the protection band, theusers on the ground switch to another satellite that does not in the protection band to continuously implement communication.

The method includes: in first transmission time interval, the first cell base station makes upstream transmission for the first wireless scheduling resources obtained from wireless resources schedule of first frequency range, and the second cell base station neighboring the first cell makes downstream transmission with the second wireless scheduling resource of first frequency range and makes upstream transmission with the second wireless scheduling resource of the second frequency range; in the second transmission time interval, the first cell base station makes downstream transmission with the first wireless scheduling resource obtained from the wireless resource schedule of first frequency range, and the second cell base station makes upstream transmission with the second wireless scheduling resources; the first cell base station makes upstream transmission with the first wireless scheduling resource, and the second cell base station makes downstream transmission with the second scheduling resource. The invention can avoid interference between neighboring cells.

The invention discloses a method and a device for data transmission of continuous equidirectional subframes, which are used for solving the problem that when data is transmitted in the prior art, the subframes are easy to have heavy loads and generate larger same frequency interference in an adjacent region. The method comprises the steps: the second highest resource utilization of non-end subframes in the current continuous equidirectional subframes is confirmed according to the resource utilization information of a previous set of continuous equidirectional subframes in the same data transmission direction and the first highest resource utilization of the non-end subframes in the first set of continuous equidirectional subframes; the highest data transmission quantity of each non-end subframe in the current continuous equidirectional subframes is confirmed according to the second highest resource utilization, and data is distributed on each non-end subframe of the current continuous equidirectional subframes according to the highest data transmission quantity, and then is data transmission is performed.

The invention is a clearance-type waking up method of a wireless meter reading system, comprising the following steps: transmitting a pulse every second to a wireless communication chip by a microprocessor in a wireless collection terminal; placing the pulse into an information collection register in the wireless communication chip; judging whether the same frequency signal having the same overlapping with the work frequency of 470MHz exists or not in monitoring time, if not, the wireless communication chip being at dormant state, if so, sending back a response pulse to the microprocessor by the wireless communication chip; sending a directive for waking up the wireless communication chip quickly and leading the wireless communication chip at work state. The invention solves the problems of large energy consumption of repeatedly waking up of the wireless collection terminal, same frequency inference and small distance of meter reading in existing wireless meter reading system.

According to a network signal anti-interference transmission device, a signal frequency modulation circuit receives a signal source at the signal input end, baseband frequency signals are generated through an oscillation circuit, and the baseband frequency signals enter an impedance conversion circuit after being further subjected to frequency modulation through an automatic tuning circuit and enter a modulation circuit after being subjected to isolation, follow-up amplification and further isolation, so that the signal precision is improved; the frequency hopping control circuit generates a carrier signal by using an oscillation circuit; after frequency multiplication by the frequency multiplier, signals are output to the modulation circuit. A linkage tuning loop follows the automatic tuning loop to control the frequency of a carrier signal to change frequency points. Harmonic frequency interference with a carrier signal after frequency multiplication of the interference signal is avoided. A detector circuit feeds back a signal after frequency multiplication. On one hand, the effect of stabilizing the oscillation amplitude is achieved, on the other hand, automatic frequency multiplication and frequency modulation are achieved during amplitude attenuation, same-frequency interference in transmission is avoided, the modulation circuit modulates a high-frequency carrier signal and a baseband frequency signal through a triode Q5, and finally frequency selection is conducted through an LC tuning loop, that is, pilot-frequency interference is avoided, and then the signals are output toa transmitter.

The invention discloses a dynamic frequency multiplexing method in cloud wireless access heterogeneous network architecture. The cloud wireless access heterogeneous network comprises a macro far end radio frequency head, a micro far end radio frequency head, a base station resource pool and a high-speed switching structure, and is characterized in that the heterogeneous network and the cloud wireless access network structure are combined, a graph coloring-based frequency resource allocation method and a graph coloring-based frequency resource allocation adjustment method are adopted, two cells in the adjacent same layers or different layers in the heterogeneous network can be ensured not to use the same frequency band to avoid same-frequency interference, and allocation of spectrum resources is dynamically realized and adjusted so as to meet constantly-changing user number inside the cell according to the spectrum resource requirement amount changing along with the time in each cell. The dynamic frequency multiplexing method in cloud wireless access heterogeneous network architecture can be applied to a full-frequency band orthogonal frequency division multiplexing system, the utilization rate of the spectrum resources can be effectively improved, and the throughput of each cell is added.