35results about How to "Reduce self-interference" patented technology

The embodiment of the invention provides a transmission method and a device of energy and information in a wireless energy supply communication network. By using a full duplex communication mode and designing beam forming factors for a source node and a relay node, self-interference generated in the full duplex communication process is reduced and throughout of the network is increased. The source node obtains energy from signals sent by the relay node and from signals sent by itself, so energy efficiency sent by the source node can be increased.

The invention relates to an intelligent aerial signal receiving and transmitting method of CDMA high speed data base station, belonging to the mobile communication technical field. The method adopts intelligent aerial technology in base station uplink signal receiving and downlink high speed data transmitting circuit and transmits the signal for the downlink voice user continuously adopts common sector directive aerial technology in the CDMA2000. The invention also relates to a base station uplink signal receiving and transmitting circuit and a downlink high speed data base station signal transmitting circuit, wherein, the uplink signal receiving wave beam figuration circuit can adopt two kinds of wave beam figuration method, namely the baseband wave beam figuration method and the carrier wave beam figuration method; the wave beam figuration method of the downlink signal transmitting can only adopt the carrier wave figuration method. The downlink wave beam figuration weight value can be instantly and directly obtained by the table look-up operation, using the uplink wave reaching direction DOA estimation, without predicting estimation on the downlink independent carrier frequency.

This invention discloses a method for sending and receiving information and a device, in which, said device includes: a channel estimation unit, a channel correcting unit, a demodulation and information hard decision unit, a channel obtaining unit and a time slot delay unit, the method for sending information includes: designing an up power control unit including the pilot information of the first K time slots and the control information including power control order words of the latter time slots L and the K and L are positive integrals and the sending end sends the up power control information unit, the method for receiving information includes: the pilot information of the first K time slots of the receiving end carries out channel estimation, channel correction to the current time slot control information, demodulation and hard decision to get the actual control information and channel information of the current time slot then carrying out channel estimation based on the acquired channel information after delaying for a time slot.

The invention belongs to the technical field of marine electromagnetic detection, and discloses a marine electromagnetic field signal acquisition system, device and a marine environment observation system. The system comprises an electric field signal acquisition unit, a magnetic field signal acquisition unit, an azimuth attitude signal acquisition unit, a platform magnetic field signal measurement unit and a main control unit. The system can realize a detection mode of combining an electric field and a magnetic field; a magnetic field generated by movement of the mobile platform and a magnetic field generated by internal parts of the platform can be compensated; and various magnetic field measurement modes including independent magnetic field acquisition, tensor type magnetic field acquisition and zero magnetic tensor type magnetic field acquisition can be supported. The electric field signal acquisition unit, the magnetic field signal acquisition unit, the azimuth attitude signal acquisition unit, the platform magnetic field signal measurement unit and the main control unit all adopt low-noise design. Collection of weak low-frequency electric field and magnetic field signals in the marine environment can be achieved, and the system can be used for marine environment background electromagnetic field measurement and marine environment underwater target detection.

The invention discloses a self-interference eliminating method in a two way full-duplex MIMO relay communication system. The method aims at addressing the problem of neglecting system capacity property while taking into consideration of minimizing self-interference of prior art. The method includes the following steps: 1. estimating channel parameters; 2. designing the transmission of a first source node, receiving a beam forming matrix to eliminate the self-interference of the first source node; 3. designing the transmission of a second source node, receiving a beam forming matrix to eliminate the self-interference of the second source node; 4. and designing the transmission of a relay node, receiving a beam forming matrix to eliminate the self-interference of the relay node, and at the same time selecting the transmission that conform to conditions, and receiving a beam forming matrix and maximizing the system capacity. According to the invention, the method eliminates the self-interference of the relay node as well as the self-interference of the two source nodes, can maximize the system capacity while eliminating self-interference, and can be used in distributed cooperation transmission system of future fifth generation of wireless mobile communication.

The invention discloses a Massive MIMO FBMC beam space-time encoding downlink transmission method. The method comprises the following steps: performing OQAM modulation, Alamouti block encoding and FBMC modulation on the bit stream information sent to a user to obtain a to-be-sent signal, then performing linear weighting, arriving at different users at different moments by sending channels after different fading, performing FBMC modulation on the received signal by the user, calculating an equivalent channel, performing MMSE channel equalization, and finally performing OQAM demodulation to restore the bit stream information sent by a base station to the user. According to the Massive MIMO FBMC beam space-time encoding downlink transmission method disclosed by the invention, two high-quality techniques, namely Massive MIMO and the FBMC, are combined together, thereby greatly improving the capacity, the energy efficiency and the spectrum effectiveness of the system, eliminating the interference between users, reducing the operation amount, reducing the self interference in FBMC system and improving the bit error rate performance of the system.

The present invention relates to a high-isolation dual polarization station antenna unit facing 5G application. The unit comprises a dielectric slab, a coaxial feeder, a back panel and an SMA feeder arranged in order from top to bottom. The front and back surfaces of the dielectric slab are etched with a first bow-tie dipole antenna and a second bow-tie dipole antenna which are vertically arrangedat +-45 degrees, each bow-tie dipole antenna is formed by two symmetrically arranged dipole antenna arms, and each dipole antenna arm comprises one optimized fractional parasitic structure. The high-isolation dual polarization station antenna unit facing 5G application forms a station antenna unit with low loss and high isolation features and low loss and high loss and high isolation through theoptimized fractional parasitic structure so as to reduce the loss of the antenna itself and reduce the self interference between antennas.

An embodiment of the present application discloses an antenna array, comprising N antenna elements; the N antenna elements have the same wavefront direction and the transverse spacing between every two is equal. The feeding phases of the N antenna elements form a first arithmetic sequence, and the tolerance of the first arithmetic sequence is a preset phase difference; The distances of the N antenna elements to the vertical plane in the wavefront direction form a second arithmetic sequence, and the tolerance of the second arithmetic sequence is a preset distance difference; The spatial phase difference between the N antenna elements formed by the preset distance difference and the preset phase difference is cancelled out with respect to the vertical plane; N is an integer greater than or equal to 2. When the antenna array is applied to the transmitting and receiving channels of the radar system, the leakage signal can be canceled, the self-jamming is greatly reduced, the receiving channel of the radar system is protected, and the sensitivity of the radar system is improved. Embodiments of the present application also provide an antenna transceiver system and a radar system.

An antenna system is provided. The antenna system comprises a first antenna with a first operating frequency and a second antenna with a second operating frequency. The second antenna has a first near field with a first near region in which the first antenna is disposed and a second near region. The second antenna has a first gain in the first near region which is lower than a second gain in the second near region. The first gain and the second gain are both at a same one of the first operating frequency and the second operating frequency.

The invention discloses a backscatter communication method, which comprises the following steps of: acquiring a signal bandwidth of a radio frequency signal, and determining that an absolute value of a shift frequency delta f of a backscatter signal is less than 1 / 2 of the bandwidth of the radio frequency signal; using a periodic signal with the frequency of delta f as a reflection coefficient of the tag circuit, so that a radio frequency signal is subjected to frequency shift, and a backscattering signal is generated; and carrying out time synchronization deviation compensation and frequency offset compensation receiving on the backscattering signal, and decoding the backscattering signal. The invention further comprises a device and a system for implementing the method. According to the invention, the problem of serious self-interference of a radio frequency signal on a backscattering signal is solved.

The invention discloses a small-sized welding packaging high power simulation optical module. A simulation laser source inner core, the superfluous external circuit of which is stripped, is disposed in a TO case in a packaged manner, and an optical detector is disposed in another TO case, and the simulation laser and the optical detector are respectively connected with an input optical interface and an output optical interface. A functional circuit comprises a driving circuit and a pre-amplification and limiting-amplification circuit. A transmitting and receiving optoelectronic device, the functional circuit, and the optical interfaces are disposed on the same circuit board, and are disposed in an SFF2*10 for welding and packaging. Welding pins are connected with the corresponding functional pins of the optoelectronic device and the functional circuit. The simulation laser is connected with an automatic power control circuit, a pre-distortion compensation circuit, and an automatic temperature control circuit device. The simulation laser and the optical detector are connected with a digital diagnosis monitoring circuit, and the optical detector is also connected with a signal alarming circuit. The linearity, the spectral characteristic, the temperature stability performance, and the modulation characteristic of the small-sized welding packaging high power simulation optical module are better than that of a digital laser, and the small-sized welding packaging high power simulation optical module has advantages of high optical power, large dynamic range, small packaging, stable linear range, and high reliability.

The present invention discloses an alternate iterative beam forming detector for a full-duplex relay system. The detector utilizes beam forming reception based on a minimizing mean square error to suppress self-interference of a relay terminal. At the same time, the detector utilizes a transmission beam forming matrix based on the minimizing mean square error to reduce leakage of the relay transmission signal to the relay receiver. Then, an iterative structure is introduced to the above two, so that the beam forming matrix is further optimized to improve the performance of the sum data rate and the error rate.

The invention presents a improves device with CDMA and variable spread-spectrum factor (VSF) for CDMA-TDMA communication to overcome the defect that using VSF to realize data speed compatibility for multiuser in FDD broadband CDMA or CDMA2000 standard, which comprises: a base station transmitting device with same multiplex voice or data circuit (A) of low-speed data user, a high-speed data user circuit (B), a summitor (5), a complex interference code circuit (6), and a quadrature phase-shift keying circuit (7); and a terminal receiving device comprised a RF processor (14) with output port connected to serial interference-elimination and user data demodulator (16) by quadrature phase-shift keying coherent demodulator (15). This invention can save about half emission power while reducing interference greatly and increasing system capacity.

The invention discloses a method for sending information and a method and device for receiving information. The device includes: a channel estimation unit, a channel deviation correction unit, a demodulation and information hard judgment unit, a channel acquisition unit and a time slot delay unit. The method for sending information is as follows: the uplink power control information unit is set to include the pilot information of the first K time slots and the control information of the last L time slots including the power control command word, K and L are positive integers; the sending end sends the uplink Power Control Information Element. The method of receiving information is as follows: the receiving end performs channel estimation based on the pilot information of the previous K time slots, performs channel correction, demodulation and hard judgment processing on the control information of the current time slot, and obtains the actual control information of the current time slot and channel information; after a time slot is delayed, channel estimation is performed according to the obtained channel information. The invention can reduce the power of sending the uplink power control information unit, thereby reducing the self-interference of the system and improving the capacity of the system.

This invention relates to one method to realize code dividing multi-address and time dividing mobile communication by aid of interference eliminator, which comprises the following steps: The basic station making low speed input signals through basic signal processor, codes interference device, address code circuit, gains adjustor processor; making high speed data input signal are processed through basic band signal processor, time dividing merger, series conversion device, impulse range modulator, address codes circuit, time gap gains adjustor; then input them into adder and multi-interference circuit through modulation to send; setting receiving circuit composed of interference at user end.

The embodiment of the invention discloses a method for determining an antenna and a terminal device, relates to the field of communication technology, and can solve the problem of poor transmission performance of the terminal device. The method includes: when the terminal device performs dual connectivity, acquiring a first noise value set, the first noise value set includes noise values ​​between N receiving antennas and M transmitting antennas, and N and M are both positive integers; according to The first noise value set, at least one group of antennas corresponding to the target noise value satisfying the preset condition in the first noise value set is determined as a target antenna group, the preset condition is that the noise value is less than a preset threshold, and the target antenna group is Antennas for a terminal device to perform dual connections, and one set of antennas includes a receiving antenna and a transmitting antenna. The embodiment of the present invention is applied in the process of determining the dual connectivity antenna by the terminal device.

The invention belongs to the technical field of automatic identification, and particularly relates to a label harmonic wave obtaining method for harmonic wave radio frequency identification and a harmonic wave radio frequency identification label. Harmonic waves are generated through a nonlinear device or harmonic waves generated in a nonlinear circuit are extracted from a traditional radio frequency identification label chip and serve as carrier waves used for backscatter modulating. The harmonic waves generated in a prior nonlinear component serve as the carrier waves of a harmonic wave radio frequency identification up link so that the label harmonic wave obtaining method for the harmonic wave radio frequency identification has the advantages that self-infection is as small as that of common harmonic wave radio frequency identification and the harmonic waves are generated without consumption of external power by the label. Therefore, label sensitivity is maintained. According to the label harmonic wave obtaining method for the harmonic wave radio frequency identification and the harmonic wave radio frequency identification label, receiving sensitivity of a reader can be effectively improved and operating distance of a radio frequency identification system is improved.

Embodiments of the present invention provide a method and device for networking base stations in a common frequency band, which relate to the field of communication technologies and can improve the positioning accuracy of a ground base station network. The solution of the embodiment of the present invention includes: according to the communication power of the communication base station to transmit the communication signal and the spreading gain of the spreading code, determine the positioning power of the positioning base station to transmit the positioning signal; then according to the positioning power and the first transmission loss value, determine the cellular network The maximum side length of each honeycomb hexagon in . And according to the positioning power and the second transmission loss value, determine the minimum value of the side length of each cellular hexagon in the cellular network; the positioning base station in each module in the cellular network multiplexes a set of spreading code groups, each module is different The base stations correspond to different spreading codes, and the spreading codes corresponding to the base stations at the corresponding positions of each module are the same; then, from the range between the minimum side length and the maximum side length, a value is selected as the hexagonal value of each cell in the cellular network. The side length of the shape.

The embodiment of the invention provides a common-band base station networking method and device, relates to the technical field of communication, and can improve the positioning precision of a groundbase station network. According to the scheme of the embodiment of the invention, the method comprises the steps: determining the positioning power of a positioning base station for transmitting a positioning signal according to the communication power of a communication base station for transmitting a communication signal and the spread spectrum gain of a spread spectrum code; determining the maximum side length value of each honeycomb hexagon in the cellular network according to the positioning power and the first transmission loss value; determining the minimum value of the side length ofeach honeycomb hexagon in the honeycomb network according to the positioning power and the second transmission loss value, wherein a positioning base station in each module in the cellular network multiplexes a spread spectrum code group, different base stations in each module correspond to different spread spectrum codes, and the spread spectrum codes corresponding to the base stations at the corresponding positions of each module are the same; and selecting a numerical value as the side length of each honeycomb hexagon in the honeycomb network from the range between the minimum side length value and the maximum side length value.

The embodiment of the invention discloses an optimization method of an MIMO antenna and a mobile terminal. The optimization method of the MIMO antenna comprises the following steps: the MIMO antenna at least comprises a main antenna and a diversity antenna, the main antenna and the diversity antenna receive a plurality of signals and compare channel coefficients of the plurality of signals, the signals with the same channel coefficient are the same signals, distinguishing signals are demodulated, and the distinguishing signals and the same signals have different channel coefficients. Accordingto the scheme, the self-interference problem caused by the same spatial channel coefficient in the communication process of the MIMO communication system is reduced, the MIMO transmission capabilityis improved, and the MIMO throughput performance is improved.

This invention relates to one method to realize code dividing multi-address and time dividing mobile communication by aid of interference eliminator, which comprises the following steps: The basic station making low speed input signals through basic signal processor, codes interference device, address code circuit, gains adjustor processor; making high speed data input signal are processed through basic band signal processor, time dividing merger, series conversion device, impulse range modulator, address codes circuit, time gap gains adjustor; then input them into adder and multi-interference circuit through modulation to send; setting receiving circuit composed of interference at user end.

The invention discloses an uplink relay full duplex transmission mechanism model based on non-orthogonality, which specifically comprises the following steps of: allocating transmission power sum by an uplink user 1 and a user 2 by utilizing the self-generated channel condition to a relay station, it is assumed that two users cannot directly communicate with a base station, and therefore cooperative transmission of a relay station is needed; in addition, it is assumed that the distance between the user 1 and the relay station is closer than the distance between the user 2 and the relay station. The relay station is a full duplex antenna and can implement full duplex transmission. Compared with a traditional uplink relay half-duplex transmission mechanism, the uplink relay full-duplex transmission mechanism based on the non-orthogonal multiple access technology provided by the invention has the advantage that better traversal capacity communication performance is obtained.

The invention discloses a Massive MIMO FBMC beam space-time encoding downlink transmission method. The method comprises the following steps: performing OQAM modulation, Alamouti block encoding and FBMC modulation on the bit stream information sent to a user to obtain a to-be-sent signal, then performing linear weighting, arriving at different users at different moments by sending channels after different fading, performing FBMC modulation on the received signal by the user, calculating an equivalent channel, performing MMSE channel equalization, and finally performing OQAM demodulation to restore the bit stream information sent by a base station to the user. According to the Massive MIMO FBMC beam space-time encoding downlink transmission method disclosed by the invention, two high-quality techniques, namely Massive MIMO and the FBMC, are combined together, thereby greatly improving the capacity, the energy efficiency and the spectrum effectiveness of the system, eliminating the interference between users, reducing the operation amount, reducing the self interference in FBMC system and improving the bit error rate performance of the system.

The invention relates to a full duplex communication system and method based on a reconfigurable holographic metasurface, and the system comprises a base station, an uplink user group, a downlink user group, a control module, and a first reconfigurable holographic metasurface and a second reconfigurable holographic metasurface which are connected with the base station. Full-duplex communication between a base station and a user is completed by using the base station, the first reconfigurable holographic metasurface and the second reconfigurable holographic metasurface, an optimization model is constructed through a control module, and the optimization model is optimized by taking the maximum value of the total rate of a full-duplex communication system as a target to obtain optimal variable information. The base station, the first reconfigurable reflecting metasurface and the second reconfigurable transmitting metasurface are controlled according to the optimal variable information, so that self-interference between the first reconfigurable holographic metasurface and the second reconfigurable holographic metasurface is effectively weakened, and the total rate of a communication system is effectively increased.

Disclosed are an antenna determination method and a terminal device, which relate to the technical field of communications and can solve the problem of poor transmission performance of a terminal device. The method comprises: when the terminal device performs dual connection, acquiring a first noise value set, wherein the first noise value set comprises noise values between N receiving antennas and M transmitting antennas, and N and M are both positive integers; according to a first noise value set, determining at least one group of antennas corresponding to a target noise value satisfying a preset condition in the first noise value set as a target antenna group, the preset condition being that the noise value is less than a preset threshold, the target antenna group being an antenna for dual connection of the terminal device, and one group of antennas comprising a receiving antenna and a transmitting antenna. The embodiment of the invention is applied to the process of determining thedual-connection antenna by the terminal equipment.

The invention belongs to the technical field of wireless communication, and discloses an orthogonal frequency division multiplexing modulation system and a frequency domain extended non-orthogonal active interference cancellation method. The method comprises: converting serial sending data into parallel data; mapping the binary information into a multi-system communication constellation symbol; distributing the data symbols to proper subcarriers; modulating the symbol from the frequency domain to the time domain; converting the parallel signal into a serial signal; adding a time domain cyclic prefix; windowing and forming the time domain signal; using a frequency domain extended non-orthogonal active interference cancellation method to suppress frequency spectrum leakage of the sent signal; converting the signal from a baseband signal to a band signal. According to the invention, the frequency spectrum leakage of the orthogonal frequency division multiplexing signal is greatly reduced to be lower than -80dB; the interference of interference cancellation signals on data is reduced and is lower than -80dB; the energy of interference cancellation subcarriers is reduced, and the energy efficiency of the system is improved; and meanwhile, the symbol waveform is kept compatible with the CP-OFDM symbol format.