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

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 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 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 method includes the following steps. (1) The large guarding area is divided into many small plots. (2) One repeater with wireless receiver is setup at the central position of each plot. But, the different frequencies are allocated for the repeaters in adjacent plots. (3) One wireless alarm controller with same emissino frequency is allocated for each user in each plot. (4) The repeaters in all plots are networked through the mobile communication network. (5) The alarming signal forwarded by the repeater is transferred to the alarming center. The invention possesses the advantages of both the wired network and the wireless network, and avoids their disadvantages, providing the reliable signal, the benefit without need of wiring.

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 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.

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.