64results about How to "Eliminate co-channel interference" patented technology

A wireless network allocates special base-station resources to mobile user devices in the inter-station overlapping fringes that are also serviceable by a neighboring base-station. Included-fringe mobile user devices interoperate with a base-station that has been assigned to handle those particular mobile user devices. If a central controller has assigned another base-station to service them, they are referred to as an excluded-fringe mobile user device. Mobile user devices that are not visible to other base-stations can access the general base-station resources, but not any of the special base-station resources reserved for overlapping fringe area use. If no mobile user devices are operating in the overlapping fringe areas, then all the special base-station resources can be returned to the main pool of general base-station resources. A global scheduler, one part of split-level scheduling, in the central controller determines the amount of special and general base-station resources. A local scheduler, another part of split-level scheduling, in the base station do fair-sharing of its resources among user devices within their allocated type of resources. Base station can use special base-station resource of others with electronically steering antennas together with network wide awareness of central controller to optimize the spectrum usage

The invention discloses a coordinated node point selection and wireless resource dispatching method in coordinated multi-point transmission technology. In the method, firstly, coordinated user sets and non-coordinated user sets are confirmed preliminarily; then the preliminary compartmentalization of coordinated sets is carried out; and finally, the coordinated set of each user is further confirmed for conducting wireless resource dispatching. Through the stepwise optimization of the coordinated sets, the re-dispatching can be conducted for the coordinated users who are not distributed with resource during the resource dispatching, and the optimization of resource dispatching is conducted in the coordinated sets, so that under the condition of smaller complexity, the same frequency interference in a small region is reduced, the throughput of users at the edge of the small region is improved, and the fairness for the users is guaranteed.

The invention relates to a homotype radar same frequency interference suppression method used for a ship formation condition, and belongs to the technical field of radar interference resistance. When an inner radar is formed to conduct cooperative work, under the known condition of a working parameter, firstly, according to the feature that a linear frequency modulation (LFM) interference signal focuses in a fractional order Fourier field of a matching order and defocuses in a fractional order Fourier field of other orders, by the method of gradually filtering, interference which is different from frequency of a radar transmitting signal to be transmitted is sequentially eliminated by interference energy from big to small. Secondly, a signal after frequency domain processing is reversely transformed into a time domain to conduct matched filtering, and interference which is the same with frequency of an echo signal is filtered by using time domain adjacent period anti-asynchronous arithmetic. The homotype radar same frequency interference suppression method used for the ship formation condition effectively solves the problem of same frequency interference suppression different from the radar echo signal frequency, and simultaneously further eliminates the same frequency interference same with the radar echo signal frequency, improves anti-same-frequency interference ability and formation and networking ability of a ship-based homotype radar.

Orthogonal method of base station emitting signal in OFDMA system is disclosed, the emitting end includes: coding, interlacing and modulating the original information bit; the sub carrier with the same interval is distributed to a sub channel; and the channel is divided into area edge user channel and center area channel; information symbol modulated is mapped to corresponding sub carrier; two arts of channel are orthonormalized separately; for user of area edge, according to result of step b), the OFDMA symbol is divided into corresponding sections which are equal; every section is multiplied with corresponding orthonormalized sequence of the area; two parts of OFDMA symbol are added to form total OFDMA symbol; adding circulated prefixion to system; the base band signal is D / A transformed, then mapped and feedback by emitting antenna. The interference area and adjacent area of the invention can eliminate the interference in the same frequency efficiently and fully, so the communication quality of user in edge of area can be improved.

The invention discloses a method of reducing interference among adjacent cells. The method comprises the following steps: a wireless resource management entity transmits the information of resources occupied by a cell, which is adjacent to the cell where user equipment is located and belongs to SFN service area, to the user equipment; the information comprises a frequency point, a time slot, and a training serial code and / or an interference code used by the occupied time slot; when receiving operation data, the user equipment, according to the received and saved resource information, determines an adjacent cell which occupies the same frequency point and the same time slot as the user equipment, and the time slot of which uses a different training serial code or a different interference code; and according to the determined training serial code and interference code used during the time slot of the adjacent cell and by using a multi-cells joint detecting method, the same-frequency interference caused by the adjacent cell is reduced or eliminated. The invention further discloses a wireless resource management entity and the user equipment. By using the method and the equipment, the interference from the adjacent cell can be reduced or even eliminated without increasing the complexity of resource allocation and without wasting resources.

The invention belongs to the radar technology field and discloses an outer radiation source radar cofrequency interference elimination method. The method comprises steps that a reference signal received by a reference antenna and M echo signals received by an array element antenna are acquired; direct wave signals and multi-path signals of the M echo signals are eliminated by utilizing the reference signal to acquire M first echo signals, and an echo signal matrix is constructed; independent component analysis on the echo signal matrix is carried out to acquire three independent component signals; the three independent component signals are utilized to carry out three times of time domain interference elimination for the echo signal matrix to acquire three second echo signals; distance-Doppler two-dimensional correlation for each second echo signal and the reference signal is carried out to acquire three correlation matrixes, target detection is carried out by utilizing the correlation matrixes, second echo signals corresponding to the correlation matrixes of the target information can be acquired, namely echo signals after cofrequency interference elimination. The method is advantaged in that cofrequency interference in a main lobe can be effectively eliminated, and a relatively good target detection result is acquired.

Embodiments of the invention disclose an interference coordination method and device of a common search space (CSS). The method comprises: firstly, a base station selects a resource location of a CSS in communication resources according to a mapping mechanism, which relates a reference signal and / or reference information of the reference signal to the resource location of each CSS; and then the base station sends the reference signal and / or the reference information of the reference signal corresponding to the resource location of the CSS to a piece of user equipment corresponding to the base station, so that after the user equipment obtains the resource location according to the mapping mechanism, the user equipment receives control information transmitted by the base station at the resource location. The method and the equipment are suitable for the field of communication systems.

The invention relates to a relay directional configuration combined frequency division multiplexing method facing the long term evolution-advanced (LTE-A). According to the method, the directionality of a directional antenna is utilized to improve the spectrum efficiency of a system, and a combined frequency spectrum distribution scheme is arranged according to the direction and the angle of the relay direction antenna to reduce the same frequency interference in each cell and between cells, control mutual interference between a relay station and a honeycomb base station and improve system performance. First, an available band is divided into a center cell band and an edge section band, and interference of edge users between the cells is eliminated, then a relay technology is introduced to expand the network coverage and improve the system throughput of the cells to expand the network coverage, but meanwhile the problems of resource distribution, complex interference structure and the like are solved. The 120-degree directional antenna with the fixed azimuth angle is arranged for a relay, and interference of the relay station to macro base station service users can be controlled while the relay is introduced. According to the band division, the relay combined frequency division multiplexing method is provided, the frequency spectrum frequency is effectively improved, and the relay is controlled to be prevented from generating severe interference on the section users.

The embodiment of the invention provides a method and device for searching wireless electromagnetic ambient interferences on a high speed railway. The method comprises following steps: when co-channel interferences are detected, checking the frequency of the first frequency band of a public mobile communication network; quitting the first range frequency points in the public mobile communication network out of the network; when adjacent channel interferences are detected, indicating to replace a broadband analog repeater by a digital optical fiber and replace a broadband duplexer by a narrowband duplexer; when intermodulation interferences are detected, indicating to improve non-high speed railway frequency points so as to prevent intermodulation signals from falling on a railway GSM (Global System for Mobile Communications)-R frequency band, or indicating to mount a band-pass filter so as to suppress the intermodulation signals; when stray interferences are detected, indicating to reduce the transmitting power of a base station and mount the band-pass filter at the base station; when blocking interferences are detected, indicating to improve the non-high speed railway frequency points or indicating to reduce the power of the base station and add the band-pass filter at a receiving end. In adoption of the method and the device provided by the invention, the operation stability of the railway GSM-R system is ensured.

The invention relates to a same frequency networking method providing multimedia broadcast and multicast services. The same frequency networking method comprises the steps of: (a) dividing cells in continuously overlay areas into multicast group areas or broadcast area; (b) selecting frequency and timeslot bearing the multimedia broadcast and multicast services MBMS for the cells in the multicast group areas or the broadcast areas, while the frequency and the timeslot of the cells in the same multicast group areas or the same broadcast area are the same; (c) distributing MBMS service scrambling codes for the multicast group areas or the broadcast areas, and different MBMS service scrambling codes are used in different multicast group areas or different broadcast areas, while the same MBMS service scrambling codes are used in the same multicast group areas or the same broadcast areas; (d) the MBMS services are transmitted by each cell on the frequency and the timeslots selected in step (b) by using the MBMS service scrambling codes of the multicast group areas or the broadcast areas of the cells.

The invention provides a method for transmitting multimedia broadcast multicast service by means of a multi-antenna system. The method comprises the following steps: firstly, a center-driven sector is equally divided into N small sectors; secondly, the data of the to-be-transmitted multimedia broadcast multicast service time slot of one of the small sectors is duplicated N times to form the data of N time slots; thirdly, according to the mode that each time slot is corresponding to a wavepacket, the layout of the data and the time slots of the sectors is completed; fourthly, subscriber equipment, which receives the signal of the N time slots, extracts the data of self subzone and transmits the extracted data to a demodulating module after merging the data. Through adopting the technical proposal, the invention increases the receiving gain of MBMS service of a single subzone and eliminates the problem of same frequency interference in broadcast channel service in TDD mode; therefore, MBMS service can meet the requirements of all-subzone coverage.

The invention provides a method for achieving coordinated multipoint (CoMP) downlink transmission between base stations and corresponding base stations. The base stations send signaling to UE which supports the CA and is determined to carry out downlink transmission by use of the CoMP way, and indicate the UE to use HARQ of unused CA secondary component carriers for data transmission of CA main component carriers. When the base stations determine that CoMP coordinated adjacent regions of the UE include common-frequency adjacent regions of other base stations, downlink data of the UE is scheduled in advance in a HARQ process of a Pcell and the downlink data and time frequency resource information thereof are sent to the common-frequency adjacent regions of other base stations, thereby carrying out CoMP downlink transmission. According to the invention, through the advanced scheduling of the Pcell and the HARQ process reuse of the CA secondary component carriers, common-frequency interference is eliminated in case of non-ideal transmission cross stations, so bandwidth utilization rate of edge users is increased and CoMP application space is extended.

The invention provides a method and system for generating high-interference indication information as well as a corresponding sending method and system. According to the measurement report reported by UE (user equipment), the UE in a service cell is divided into one or multiple UE groups; the high-interference indication information of each UE group is generated; and the high-interference indication information of each UE group is sent to the target cell maintained by the UE group. The corresponding system comprises a dividing device, a generating device and a sending device. According to the invention, the same frequency interference among uplink cells can be eliminated effectively.

The utility model discloses an interference eliminating method for the random access to the base station, which is characterized in that: choosing candidate code in order to detect the machined received ranging code signal when the ranging code is transmitted, and eliminating the ranging signal related to the selected candidate code. The utility model has the advantages that reducing the co-frequency interference in the random access in the communication system, improving the detection performance of the base station, ensuring a high service quality of the base station, and improving the experience in using. The utility model also discloses a communicator and the related system.

The invention provides a method for transmitting MBMS (Multimedia Broadcast / Multicast Service) with the same frequency, which comprises the steps as follows: (a) the MBMS is divided into one or a plurality of service groups according to different service nature; (b) cells in a continuously covered area are divided into one or a plurality of cell groups; the binding relationship between the service groups and the cell groups is established; MBMS service areas are formed; the same MBMS service area adopts the same frequency and time slot for loading the MBMS service; (c) MBMS service scrambles are distributed among the MBMS service areas, and different MBMS service scrambles are distributed to different MBMS service areas; (d) each cell uses MBMS service scrambles of the MBMS service area to which the cell belongs to transmit the MBMS service.

The invention provides a co-frequency interference cancellation method and device, a co-frequency interference detection method and device, and a base station, and relates to the field of wireless communication. The co-frequency interference cancellation method comprises the steps: after transmitting a query signal to user equipment (UE), receiving channel quality of a secondary component carrier (SCC) and channel quality of a co-frequency adjacent cell corresponding to the SCC, which are reported by the UE according to the query signal; according to the received channel quality of the SCC and the received channel quality of the co-frequency adjacent cell corresponding to the SCC, determining a target SCC, the co-frequency interference intensity of which is larger than a first preset threshold; according to the coordinated multipoint technology, cancelling co-frequency interference of the target SCC. By adopting the technical scheme provided by the invention, a problem that a frequency band resource of the co-frequency adjacent cell is consumed when co-frequency interference is cancelled is solved, resource waste is avoided, and throughput of an SCC subscriber in a carrier aggregation is effectively increased, so that the spectrum efficiency of a whole network is improved.

The invention discloses a combined interference rejection method, a combined interference rejection device, and a method and a device for implementing uplink CoMP. The combined interference rejection method, which is used for implementing uplink CoMP, comprises the following steps: a first cell receives scheduling information of a second terminal sent by a second cell, wherein the second terminal belongs to the second cell, and the scheduling information includes resource block information and pilot symbol position information allocated by the second cell to the second terminal; and when the first cell demodulates information sent by a first terminal under the first cell, co-channel interference of the second cell to the first cell is eliminated by an interference rejection combining algorithm according to the scheduling information. By using the combined interference rejection method of the invention, the technical problem that the existing distributed network cannot implement uplink CoMP and is of poor uplink CoMP anti-jamming capability 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 method and a device for dynamically network a sensing extension layer of the Internet of things, relates to the technical field of communication networks, and is used for solving a problem of frequency band interference existing in communication of the sensing extension layer of the Internet of things. According to the embodiment of the invention, periodic sensing trigger signalling is sent to sensing nodes, wherein the sensing trigger signalling comprises a preset frequency band; frequency band detection results sent by the sensing nodes are received, wherein the frequency band detection results comprise sensing frequency points and detection probabilities Pd corresponding to the sensing frequency points; frequency band detection is carried out on the sensing frequency points in the frequency band detection results to acquire an average frequency band detection result, and the average frequency band detection result comprises an average detection probability Pd-ave corresponding to the sensing frequency points; and when the detection probabilities Pd corresponding to the sensing frequency points are greater than or equal to the average detection probability Pd-ave corresponding to the sensing frequency points, the preset frequency band acts as a idle communication frequency band, and data transmission is carried out with the sensing nodes through the idle communication frequency band. The scheme provided by the embodiment of the invention is suitable to be adopted when networking is carried out on the sensing extension layer of the Internet of things.

The invention relates to an optimization method of a measurement control message of a TD-SCDMA system, a method for acquiring a co-frequency interference neighbor cell list by a terminal and the terminal. The measurement control message at least comprises ID information of co-frequency neighbor cells of the cell located by the terminal, and the optimization method of the measurement control message comprises the step of adding auxiliary frequency point information of different-frequency neighbor cells of the cell located by the terminal in the measurement control message. The method for acquiring the co-frequency interference neighbor cell list by the system terminal comprises the steps of using the terminal for receiving the measurement control message which is issued from a network and comprises the auxiliary frequency point information of the different-frequency neighbor cells of the cell located by the terminal, using the terminal for acquiring the information of a first neighbor cell with a main frequency point which is the same with a working frequency point of the terminal from the measurement control message, using the terminal for acquiring the information of a second neighbor cell with an auxiliary frequency point which is the same with the working frequency point of the terminal from the measurement control message, and using the terminal for acquiring the co-frequency interference neighbor cell list through the acquired information of the first neighbor cell and the information of the second neighbor cell.

A signal processing circuit and a signal processing method for removing a co-channel interference from a digital signal are provided. The signal processing circuit employs an adaptive filter for estimating a co-channel interference in a received digital signal. The adaptive filter takes the digital signal having a symbol signal outputted from a slicer subtracted therefrom as an input thereof. As such, the output of the adaptive filter does not contain any symbol data. Therefore, when the outputted estimation signal is subtracted from the received digital signal, it won't introduce any inter-symbol interference.

The invention relates to the technical field of communication, in particular to a method and device for eliminating a radiation type leaky cable same frequency interference phenomenon. The device comprises two leaky cables, two matched loads and an anti-interference box or an anti-interference band. Each matched load is installed at one end of the corresponding leaky cable, the other end of each leaky cable is connected with a signal generator, signal sources of the two signal generators are input into the leaky cables with the same frequency and power, and the anti-interference box or the anti-interference band is installed outside the joint of the two matched loads and used for eliminating the same frequency interference phenomenon. According to the method and device for eliminating the radiation type leaky cable same frequency interference phenomenon, non-magnetic conductive metal materials are adopted, and reasonable design is conducted, so that a composite type anti-interference structure is formed, same frequency interference of the leaky cables is eliminated, and a reliable guarantee is provided for train communication quality and continuous operation.

The invention provides a novel communication receiving method capable of avoiding same-frequency interference based on DFT (Discrete Fourier Transform). The method comprises the following steps of: 1)establishing a wireless data receiving model x containing multipath signals; 2) performing Fourier transform processing on the received signal model x, establishing a beam vector S and a diagonal matrix T thereof, and constructing an equivalent relationship by using S and T; 3) solving a frequency vector a and an amplitude vector b after conversion by using the beam vector S and the diagonal matrix T thereof; 4) substituting the converted frequency vector a into a relational expression for factorization; and 5) solving the amplitude estimation value by utilizing the solved frequency estimation value. Compared with the traditional communication receiver, the method has the advantages that the same-frequency interference can be better removed by adopting the novel receiving method, and thereceiving performance is obviously superior to that of the traditional communication receiver.

The invention discloses a parallel computing method for channel estimation of common-frequency cells with different RS biases in LTE (long term evolution). The parallel computing method mainly includes the following steps: subtracting data signal interference of a neighbor cell from a reference signal position of a service cell to acquire a clean reference signal of the service cell; subtracting data signal interference of the service cell from a reference signal position of the neighbor cell to acquire a clean RS signal of the neighbor cell; on the basis of the clean RS signal of the service cell, performing conventional channel estimation at RS positions of the service cell and the neighbor cell; restructuring a service cell data signal located at the RS position of the neighbor cell; restructuring a neighbor cell data signal located at the RS position of the service cell; if number of iteration times does not reach a threshold value, repeating the steps 2-6, or, finishing operation. By the parallel computing method, data on two receiving antennas are merged to offset signals from the neighbor cell, and the service cell signal is demodulated, so that common-frequency interference can be removed effectively when a local cell and the neighbor cell are different in RS bias.

The invention discloses an SLNR-based beam forming method for a CoMP-JP system and belongs to the field of beam forming for a mobile communication system. By the adoption of the SLNR-based beam forming method for the CoMP-JP system, the problem that when the SLNR algorithm is used for transmission of multiple streams, the bit error rate performances of substreams are not balanced is solved. The SLNR-based beam forming method for the CoMP-JP system comprises the steps that firstly, an original precoding vector and an original precoding matrix are obtained for each user according to the existing SLNR precoding algorithm; secondly, for each user, the weighting coefficient is obtained according to the corresponding precoding vector obtained in the first step based on the two criteria of eliminating the difference between the streams and eliminating interference between the streams, and then an expression matrix used for linear transformation is constructed; thirdly, with the original precoding vectors as the bases, linear transformation is conducted on the original precoding matrix by means of the constructed expression matrix used for linear transformation, so that a group of new precoding vectors are obtained, and then a WSLNR precoding matrix is obtained; fourthly, signal forming is conducted by means of the obtained WSLNR precoding matrix, and then forming of the original precoding vectors is completed. The SLNR-based beam forming method is mainly used for beam forming in the communication field.

The invention provides a data transmission method, a terminal and a network device, relates to the field of communication, and solves the problems that in the prior art, when a network side WLAN device and a terminal working in an unlicensed frequency band are accessed to a channel, the CMSA must pass through, the realization complexity is high, and the interference elimination effect is poor. Themethod is applied to a terminal and comprises the following steps: acquiring first data which needs to be sent to network equipment through a first wireless access network; wherein the first wirelessaccess network works in an unlicensed frequency band or a shared frequency band; and sending the first data to the network equipment through the second wireless access network. According to the scheme provided by the invention, the second wireless access network is used for sending the data which should be sent through the first wireless access network. According to the embodiment of the invention, the resource competition between the terminal and the network equipment is avoided, so that the network equipment does not need to depend on CSMA and other channel sharing technologies to access the channel or the complexity of the channel sharing technology is reduced, the equipment realization complexity is reduced, the same-frequency interference can be effectively removed, and the channel utilization rate is improved.

A method for receiving and removing co-channel interference from one or more received signals that comprise different symbol or chipping rates can comprise receiving a first composite signal and a second composite signal. The method can also comprise sampling the first composite signal and the second composite signal at a particular sampling rate that is sufficient to recover signal data from both the first composite signal and the second composite signal. Further, the method can comprise estimating from the second composite signal an estimated cross-coupled second signal within the first composite signal. The estimated cross-coupled second signal is estimated from at least the second composite signal at the particular sampling rate. Further still, the method can comprise recovering a substantially decoupled first data signal by removing at least a portion of the co-channel interference caused by the estimated cross-coupled second signal from the composite first signal.

The invention discloses a preprocessing method for sea wave information inversion in a navigation radar image. The method comprises the following steps of transforming the navigation radar image froma polar coordinate system to a plane coordinate system; carrying out convolution by adopting a Laplace operator, keeping a high-brightness gray value of a same-frequency interference noise position, and reducing the gray value of the sea clutter information; quickly segmenting the same-frequency interference noise by adopting a gray segmentation threshold value; carrying out noise reduction processing on the same-frequency interference noise by adopting a linear interpolation method; adopting an Otsu algorithm and an area threshold method to quickly extract target information which needs to besmoothed and is displayed as highlight spots; and adopting a linear interpolation method to carry out smoothing processing on the result image, finally converting a processed result to a polar coordinate system, and outputting a preprocessing result. According to the preprocessing method for sea wave information inversion in the navigation radar image, the sea wave information inversion preprocessing speed and the efficiency are improved.