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

The invention discloses a networking method for an OFDMA system, which comprises the following steps: step S102, frequency planning is carried out on the cells (sectors) covered by the OFDMA system; a flexible frequency reuse mode of which the frequency reuse factor is 1 is adopted between the cells (sectors); each cell (sector) is divided into a plurality of regions, different frequency resources are distributed to the users in different regions and the distribution modes of the frequency resources between the cells (sectors) are coordinated; step S104, the frequency planning of each region is carried out; the total power of a base station is divided into two parts, one of which is used for compensating path loss and the other one of which is used for power filling and judging the proportion of the path loss compensation power and the filling power. By adopting the networking method, the co-channel interference between the cells (sectors) can be effectively constrained and the link quality and the spectrum efficiency of the system can be improved.

The invention discloses an insulation test, grounding finding device and a method for evaluating insulation aging conditions and remaining lives of insulation of lines and electrical devices by adopting the principle of absorption by using the device. The insulated grounding test and grounding finding device comprises a host machine and a signal receiver. The signal receiver is used for receiving the detected signals and the host machine comprises a CPU, a power supply unit, a high voltage unit, an insulation / voltage test unit, a grounding test unit, a grounding finding unit, a reset unit, a storage unit, an input / output unit and a communication unit; the usage method of insulation, voltage, grounding test and grounding finding device; and a method for evaluating insulation aging conditions and remaining lives of insulation of lines and electrical devices by adopting the principle of absorption by using the device.

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.

The invention provides a pilot design method and a trans-receiving device for preventing the co-frequency interference suppression of an OFDM (orthogonal frequency division multiplexing) system. The different subdistricts adopt pilot sequences generated by different basic orthogonal sequences, and different sectors respectively adopt the pilot sequences obtained by the same basic orthogonal sequence by different phase shifts in the same subdistrict; an emission end sequentially inserts the generated pilot sequences into pilot positions which are distributed bi-dimensionally and discretely with time frequency according to serial numbers of sub-carrier frequency domains to transmit; a receiving terminal firstly carries out relative treatment of the received frequency domain pilot signals and the local orthogonal pilot sequences and then eliminates the co-frequency interferences at time domains by making use of the shift orthogonal performance between the pilots after going through the IDFT (Inverse Discrete Fourier Transform). The device can effectively prevent the affects of pilots on the co-frequency interferences and can improve the channel estimation performance.

The invention discloses a method for designing a UWB orthogonal shaping pulse, pertaining to the field of communication. A Chirp pulse is compressed to generate a UWB pulse waveform to establish an Hermitian matrix and then the UWB orthogonal shaping pulse is obtained according to eigenvector. The UWB orthogonal shaping pulse generated by utilizing the method has the advantages of greater design flexibility to better meet the requirement of a spectrum template in the UWB standard, excellent spectrum utilization rate and better relevant characteristics, thereby effectively restraining the co-channel interference with the WLAN (IEEE802.11a).

The invention discloses a radar pulse modulator for modulating direct-current high voltage into various time intervals and various frequencies. A signal receiving module is connected with a pulse generator through a serial interface circuit, the output of the pulse generator is respectively connected with a first driving circuit and a second driving circuit, the outputs of the first driving circuit and the second driving circuit are respectively connected to the primary coil end of a pulse transformer, the outputs of high-voltage power supplies of the first driving circuit and the second driving circuit are respectively connected with an MOSFET branch module and an IGBT branch module, and the MOSFET branch module and the IGBT branch module are in parallel connected and then connected with the input of a branch switching controller; and an FPGA chip of the pulse generator is respectively and externally connected with a parallel output interface, a parallel input interface, a program memory, a switching control switch and a trigger pulse switch. The radar pulse modulator can conveniently control the preheating time of a transmitter, the pulse widths and the repetition frequencies of trigger pulse, restrain the same frequency interference, and obtain better wave forms during a high voltage modulating process; in addition, the driving circuits have faster on-off speed and higher voltage and power capacity.

The invention provides a communication system and a signal sending method and apparatus as well as signal receiving method and apparatus thereof. The signal sending apparatus comprises a coding modulation unit, a first processing unit and an OFDM modulation unit, wherein the coding modulation unit is suitable for, based on channel information, carrying out channel coding and constellation mapping on each sub-data stream to be sent; the first processing unit is suitable for carrying out spreading spectrum and multiple input multiple output sending process; and the OFDM modulation unit is suitable for carrying out OFDM modulation and outputting OFDM symbol data stream obtained after the OFDM modulation to a transmitting antenna for transmitting. The signal receiving apparatus comprises an OFDM demodulation unit, a second processing unit and a demodulation decoding unit, wherein the OFDM demodulation unit is suitable for carrying out OFDM demodulation on baseband signals received by receiving antennas; the second processing unit is suitable for carrying out multiple input multiple output receiving process and de-spreading spectrum operation; and the demodulation decoding unit is suitable for carrying out constellation de-mapping and channel decoding, and thus target data is obtained. The technical scheme of the invention is capable of effectively resisting frequency selective fading and the interference of co-frequency neighbor cells, so that the communication system is allowed to have high stability, high throughput and co-frequency networking capability.

The embodiment of the invention provides a communication resource allocation method, a communication resource allocation system, a terminal and a network side apparatus. The communication resource allocation method comprises the following steps that: terminal equipment measures a current signal-to-leakage-and-noise ratio, a user packet to which the terminal equipment currently belongs can be determined through the current signal-to-leakage-and-noise ratio; when the user packet to which the terminal equipment currently belongs is a community center user packet, the terminal equipment receives information corresponding to a center user transmission band assigned by the network side apparatus, and is accessed to the center user transmission band, and performs uplink transmission on the center user transmission band through using transmitting power which is determined by a predetermined power control mode; and when the user packet to which the terminal equipment currently belongs is a community edge user packet, the terminal equipment receives information corresponding to an edge user transmission band assigned by the network side apparatus, and is accessed to the edge user transmission band, and performs uplink transmission on the edge user transmission band through using a transmitting power maximum allowable value. With the communication resource allocation method, the system, the terminal and the network side apparatus of the invention adopted, the suppression of co-channel interference can be realized in a heterogeneous network.

The invention discloses a multi-user D2D communication resource allocation method based on spectrum allocation and power control. The method comprises the following steps: 1) calculating a D2D user jand a cellular user i after sharing the same spectrum resource; 2) judging whether the D2D user j can reuse the spectrum resource of the cellular user i; 3) calculating an interference coefficient between the D2D user and the reusable cellular user; 4) enabling the D2D user to select the spectrum resources of the cellular user for multiplexing, so that the interference coefficient of the system isminimum; 5) solving the optimal transmitting power of the D2D user on the premise of meeting the lowest SINR of the D2D user and the cellular user; 6) calculating the throughput capacity of the system. According to the method, the frequency spectrum utilization rate of the system can be improved, same-frequency interference existing when the D2D user and the cellular user share the same frequencyspectrum resource is restrained, and the throughput of the system is increased while the lowest SINR of the cellular user and the D2D user is guaranteed.

The invention relates to a Beidou GPS dual-mode positioning method, positioning terminal and positioning system. The method comprises steps of receiving satellite positioning data information, and according to the satellite positioning data information, reading a second pseudo range between the Beidou GPS dual-mode positioning terminal and a positioning satellite; receiving a difference factor broadcast by a base station and correcting the second pseudo range according to the difference factor so as to obtain a second real range between the Beidou GPS dual-mode positioning terminal and the positioning satellite; and according to the second real range and the satellite positioning data information, calculating the precise coordinate of the Beidou GPS dual-mode positioning terminal, thereby finishing positioning. According to the invention, according to the difference between a measurement position and an actual position between the base station and the positioning satellite, the difference factor is generated, and according to the difference factor, the measurement position of the Beidou GPS dual-mode positioning terminal is acquired and corrected, so the precise position of the Beidou GPS dual-mode positioning terminal is obtained, and the high precision positioning of the position is achieved.

The invention discloses a multi-user MIMO test method between base stations, comprising: for any user in a district where each base station is located, a same-frequency user occupying same time-frequency resource with the user in the current district and the adjacent district are determined; the identification information of the same-frequency user is shared between the base station of the user and the base station of the district where the same-frequency user of the user is located; the identification information is used by the district base station to estimate the channel character of the same-frequency user of other district in the base station; each station combines the users in the district with the same-frequency user thereof to be tested so as to obtain the test results of the user and the same-frequency user thereof. If applied, the invention can realize multi-user MIMO combined testing for a plurality of districts, which can effectively inhibit same-frequency interference and improve system performance.

The invention provides a communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof. The signal sending method comprises: based on channel information, carrying out channel coding and constellation mapping on each sub-data stream to be sent, carrying out multiple input multiple output sending process on the sub-data stream which has been subjected to the channel coding and constellation mapping, and carrying out OFDM modulation on the sub-data stream which has been subjected to the multiple input multiple output sending process, and outputting OFDM symbol data stream obtained after the OFDM modulation to a transmitting antenna for transmitting. The OFDM modulation comprises the sub-data stream which has been subjected to the multiple input multiple output sending process is inserted with pilot symbols of corresponding antenna ports and is mapped to corresponding physical subcarriers; and subcarriers in element units corresponding to the sub-data streams are expanded to whole or partial system bandwidth to form mapping with the physical subcarriers based on the preset mapping relation. The technical scheme in the invention is capable of effectively resisting the influence of frequency selective fading.

The invention relates to a multi-cell and multi-user co-channel interference suppression method based on triangular decomposition and an SLNR (Signal Leakage Noise Ratio) algorithm, belonging to the technical field of wireless communication. The method comprises the following steps of: (1) calculating the Frobenius norm of a channel matrix in each cell, and regulating row vectors of joint channel matrixes according to the sizes of the norms; (2) carrying out triangular decomposition on the regulated joint channel matrixes, so as to obtain equivalent channel matrixes; (3) calculating interference suppression matrixes of users in each cell according to equivalent received signals; and (4) calculating an equivalent pre-coding matrix of each user by utilizing the SLNR algorithm based on the equivalent channel matrixes which are subjected to the triangular decomposition. According to the multi-cell and multi-user co-channel interference suppression method, equivalent channel matrix models are obtained by utilizing the triangular decomposition, half inter-cell interferences are suppressed without carrying out other complex interference processing, and the residual inter-cell interferences are suppressed by utilizing the SLNR algorithm; and compared with a block diagonalization algorithm, an interference alignment algorithm of a receiving terminal and the like, the method has the advantages that the number of the matrixes of the receiving terminal can be reduced, and the calculation complexity can be simplified.

The invention discloses an insulation test, grounding finding device and a method for evaluating insulation aging conditions and remaining lives of insulation of lines and electrical devices by adopting the principle of absorption by using the device. The insulated grounding test and grounding finding device comprises a host machine and a signal receiver. The signal receiver is used for receiving the detected signals and the host machine comprises a CPU, a power supply unit, a high voltage unit, an insulation / voltage test unit, a grounding test unit, a grounding finding unit, a reset unit, a storage unit, an input / output unit and a communication unit; the usage method of insulation, voltage, grounding test and grounding finding device; and a method for evaluating insulation aging conditions and remaining lives of insulation of lines and electrical devices by adopting the principle of absorption by using the device.

Embodiments of the invention provide a method and an apparatus for canceling co-channel interference. The method comprises the steps of selecting candidate co-channel interference cells from a plurality of potential co-channel interference cells according to business measurement implemented in time slot for carrying out downlink receiver; and determining a target candidate co-channel interference cell from the candidate co-channel interference cells based on measurement results directed to the candidate co-channel interference cells, so as to eliminate the co-channel interference from the target co-channel interference cell. The embodiments of the invention can rapidly and accurately determine the co-channel interference cells and efficiently realize elimination of the co-channel interference.

The invention provides an Internet of things physical signal setting method and device and a computer readable storage medium. The method includes the following steps: setting each RU in a signal-tonesignal as a set number of transmission durations; and determining a subcarrier frequency for transmitting the single-tone signal within each transmission duration in the EU by taking a preset range of a subcarrier frequency internal of the single-tone signal transmitted with the adjacent transmission durations in the RU within a range of the subcarrier transmitting the single-tone signal according to scheduling of the subcarriers in a NB-IoT. The Internet of things physical signal setting method and device can transmit the single-tone signal by frequency hopping, and so a NB-IoT base stationcan estimate time offset of an uplink service channel, the NB-IoT base station can be ensured to feed back uplink timing advance to user equipment in real time, the user equipment can be effectively ensured to continuously transmit data in a mobile scene, and the user equipment can be effectively prevented from initiating a novel round of random access. The single-tone signal transmitting by the frequency hopping effectively improves the ability of anti-multipath fading of uplink signal-tone signal transmission and suppresses co-frequency interference.

A receiving apparatus with enhanced isolation is provided. The receiving apparatus includes a wireless detection unit, a switch connector and a receiver. The wireless detection unit includes an internal antenna and an amplifier. When the receiving apparatus is coupled to an external antenna through the switch connector, the isolation is increased through disabling the amplifier between the external antenna and the internal antenna. Therefore, the effect of co-channel interference and multi-path interference on the receiver is effectively reduced.

The invention discloses a limited feedback method in a multi-point coordinated transmission scenario and a system. The method includes dividing districts in a coordinated region of a multi-point coordinated [CoMP (coordinated multi-point)] system into two categories; selecting one district and defining the district as a main district, calling other districts as auxiliary districts, and determining the main district in a polling manner; adopting different feedback mechanisms for users in the districts divided into the two categories; and realizing information feedback only for the users with normalized signal to interference plus noise ratios (SINR) higher than a feedback threshold in the main district, and realizing information feedback only for the users with grades of interference, to the feedback users in the main district, lower than a given value in the auxiliary districts. By the aid of the limited feedback method and the system in the technical scheme, the quantity of the feedback information to the users can be effectively reduced on the premise of guaranteeing fairness among the users and suppressing same-frequency interference.

The invention provides a decoupled single-antenna interference suppression system based on fractionally-spaced equalization. The decoupled single-antenna interference suppression system comprises a same-frequency filter and a fractionally-spaced DFSE equalizer; the same-frequency filter is used for processing single-fold sampling data and performing double filtering; and the fractionally-spaced DFSE equalizer is used for receiving double-filtered data, performing equalization processing of a passing signal by using a DFSE equalization algorithm based on fractional spacing, and outputting an estimation value of the signal. The invention further provides a decoupled single-antenna interference suppression method based on fractionally-spaced equalization. On the basis of the decoupled single-antenna interference suppression technology based on fractionally-spaced equalization, same-frequency interference and inter-symbol interference in a dynamic channel can be well suppressed.

The invention provides a Doppler frequency shift determination method and device. Specifically, the method comprises the steps: determining an interference suppression matrix of an RB level accordingto a channel estimation value of the RB level corresponding to a received signal and a noise covariance matrix of the RB level corresponding to the signal after preset processing; obtaining an equivalent channel of the RB-level interference suppression matrix after spatial domain combination; and calculating an estimated value of Doppler frequency shift of the port level and the UE level accordingto the equivalent channel. According to the method and the device, the problem that the estimation accuracy of the Doppler shift of the target cell is poor due to the interference of the neighbor cell is solved; in addition, the effects of effectively inhibiting the same-frequency interference of the neighbor cell and improving the estimation accuracy of the Doppler shift with relatively low calculation overhead can be achieved.

The method comprises: the orthogonal state between the main signals desired by radio receiving system and the preamble of interference signals in same frequency is used to calculated the same frequency signals power strength in order to discriminate those same frequency signals and further to receive the main signals. The radio receiving system can also figures out the relative bearing information and transmits it to the radio transmitting system; the radio transmitting system can enhance the main signal strength and makes the interference source to reduce the strength of interference signal strength.

Disclosed is a novel on-site equivalent darkroom measurement method. Fourier transforms are performed on signals received by two antennas firstly, a zero point occurs in a directional diagram on a frequency domain by utilizing weight values and through combination with the directional diagram of a binary antenna array, the zero point is aligned with a signal direction of arrival (DOA) of equipment under test (EUT), an array output S<0>(f) only contains an interference component, signals S<1>(f) and S<2>(f) received by single antennas comprise EUT signal components and also comprise interference components, and the interference components in the array output S<0>(f) and the signals S<1>(f) and S<2>(f) are highly relevant, so the interference components in the S<1>(f) and S<2>(f) can be removed by utilizing cancellation processing, and then a signal of the EUT is obtained. Based on an advanced signal processing technology, through adoption of a double-channel system, and through combination of spatial filtering and a signal correlation processing method, when a test is performed on site, an equivalent darkroom environment can be obtained, on-site environment interferences are filtered, and a real radiation characteristic of the EUT is obtained.

The invention discloses a dynamic soft frequency reusing method based on cognition. According to the dynamic soft frequency reusing method based on the cognition, frequency spectrum using state information is obtained by means of mutual cooperation of cognition base stations, so that an available resource set is determined and same frequency interference from a neighboring cell is evaluated, and then dynamic resource borrowing and flexible selection of service base stations are carried out on the edge of an over-loaded cell according to the communication quality of a resource block. According to the dynamic soft frequency reusing method based on the cognition, a relatively fixed resource distributing method used on edge users according to traditional soft frequency reuse is changed, and the resource utilization rate is improved and transmission rate of the edge users is increased remarkably on the premise that inter-cell interference is effectively suppressed.

The invention discloses a same-frequency interference suppression method and a corresponding communication terminal. The method is applied to a communication terminal. The communication terminal comprises a control end and at least two antennas. The method comprises the steps: S1, enabling a control end to obtain reference signal receiving power in the user communication process; S2, judging whether to select a corresponding antenna for switching or not according to the reference signal receiving power. According to the method, an existing network does not need to be changed, and only the structure of the communication terminal is changed, so that a user can perform data exchange with a serving cell through only one directional antenna and cannot perform data exchange with a non-serving cell, the spectrum utilization rate is ensured, and meanwhile, the same-frequency interference problem of a band-shaped coverage cell is effectively inhibited.

The invention discloses a spectrum multiplexing method of a D2D communication system in a cellular network, and belongs to the technical field of communication. The method comprises the following steps that in step 1, if the distance between a D2D user and a serving base station of a cellular user meets a certain condition, the D2D user can reuse uplink spectrum resources of the cellular user; instep 2, if the jth pair of D2D users Dj meeting the condition in the step 1 has uplink spectrum resources of a plurality of cellular users which can be multiplexed, the cellular users with the minimuminterference metric value are selected to multiplex the spectrum resources according to the interference metric value of the cellular users Ci; in step 3, if the distance between the kth pair of D2Dusers Dk and the jth pair of D2D users Dj meets the condition of a formula (5), the D2D users Dk and the D2D users Dj can share the spectrum resources of the same cellular user. The inter-layer interference between the cellular users and the D2D users and the intra-layer interference between the D2D users can be effectively suppressed, and the spectrum utilization rate and the system energy efficiency are improved.

The invention discloses a multi-user multi-mode D2D communication resource allocation method based on energy efficiency. The method comprises the following steps: 1) constructing a heterogeneous network model of a cellular network and a D2D communication shared spectrum; 2) calculating a D2D user signal-to-noise ratio and a cellular user signal-to-noise ratio in the heterogeneous network; 3) obtaining an energy efficiency expression; 4) selecting a transmission mode according to the distance between the D2D users and the signal-to-noise ratio; 5) searching an optimal relay node in the relay mode; 6) obtaining the transmitting power range of a signal transmitting end; 7) obtaining the optimal transmitting power and energy efficiency; 8) searching for an optimal cellular network link for a D2D user for multiplexing, so D2D communication can be better fused with cellular communication, the influence on the cellular communication is reduced, and the concept of green communication is better met.

The invention discloses a radio frequency power amplifier module in a train intelligent monitoring network node. The radio frequency power amplifier module in the train intelligent monitoring network node comprises a main chip, a power supply circuit, a radio frequency input circuit, a radio frequency output circuit, a driving control circuit and a pre-amplification circuit, wherein the main chip is respectively connected with the power supply circuit, the radio frequency input circuit, the radio frequency output circuit, the driving control circuit and the pre-amplification circuit. On the research background of the train wireless sensor network technology, in order to guarantee normal communication after a train enters the environment with weakened signals such as a tunnel or a mountainous area, the radio frequency power amplifier module guarantees large enough output power through amplification and guarantees normal transmitting and receiving of communication data. The radio frequency power amplifier module in the train intelligent monitoring network node guarantees that in the environment with weakened signals, a monitoring network carries out real-time and continuous monitoring on the operation state of vehicle-mounted equipment, and reduces safety risks when the train runs. The radio frequency power amplifier module in the train intelligent monitoring network node can restrain same-frequency signals of an output end, prolongs the communication distance, improves the reliability of data transmission, and well guarantees correct transmission of monitoring data.

The invention discloses a wireless medical equipment interference suppression method based on synchronous status monitoring. The wireless medical equipment interference suppression method based on synchronous status monitoring is characterized in that a plurality of medical equipments of the same household are used to form an independent Bluetooth piconet by using a Bluetooth technology, and a 10-bit stochastic sequence is allocated to the master equipment of the Bluetooth piconet, and is corresponding to length of a timer; after the timing of the timer is ended, the master equipment and the slave equipment of the Bluetooth piconet are switched from a connection status to a synchronous status in a time period Ts, and the master equipment and the salve equipment are used to monitor data packets in a preset frequency band in the above mentioned time period Ts; when the data packets are monitored by the master equipment and the slave equipment, the synchronous status is ended, and a local clock is updated, and then a new synchronous status is maintained; when the master equipment and the slave equipment cannot monitor the data packets, the own data packet is transmitted by the master equipment, after the monitoring time period Ts is up, and the synchronous status is disconnected, and the timer is reset. A problem of same frequency interferences between Bluetooth piconets is effectively suppressed, and the communication quality of the medical equipments in the various Bluetooth piconets is guaranteed.

The invention discloses a communication method and system of the Internet of Things, the communication method is applied to a base station, the base station is connected with a terminal device, the communication method comprises the following steps: counting the number of symbols of a radio frame and generating a random bit sequence, and the number of bits in the random bit sequence is the same asthe number of symbols of the radio frame; modulating each bit of the random bit sequence to generate a random phase to obtain a random phase sequence; multiplying each random phase in the random phase sequence by each symbol of the radio frame in sequence to obtain a scrambled radio frame, all sample points in the same symbol being multiplied by the same random phase; and communicating with the terminal equipment according to the scrambled radio frame. By implementing the method, the same-frequency interference can be resisted on the premise of not increasing the complexity of the receiver.

The invention discloses a dynamic soft frequency reusing method based on cognition. According to the dynamic soft frequency reusing method based on the cognition, frequency spectrum using state information is obtained by means of mutual cooperation of cognition base stations, so that an available resource set is determined and same frequency interference from a neighboring cell is evaluated, and then dynamic resource borrowing and flexible selection of service base stations are carried out on the edge of an over-loaded cell according to the communication quality of a resource block. According to the dynamic soft frequency reusing method based on the cognition, a relatively fixed resource distributing method used on edge users according to traditional soft frequency reuse is changed, and the resource utilization rate is improved and transmission rate of the edge users is increased remarkably on the premise that inter-cell interference is effectively suppressed.