53results about How to "Cancel self-interference" patented technology

The invention discloses an information transceiving method in co-time co-frequency full duplex communication. In a vortex electromagnetic wave structure generating n (n>1) orbital angular momentum (OAM) modes, arbitrary k (0<k<n) modes of the n OAM modes are used for information sending and the remaining (n-k) OAM modes are used for information receiving by means of orthogonal property of the OAM modes, multiple signals which are independent to each other and do not interfere with each other can be simultaneously sent and received by the same frequency band in no need of extra self-interference elimination measure, high-rate and high-capacity co-time co-frequency full duplex communication is further achieved, the problems of existing wireless communication spectrum resource shortage, limited communication rate and the like are effectively solved, and a solution idea is provided for modern high-rate and high-capacity wireless communication.

The invention discloses a signal transmitting method and device, which are used to eliminate the interference of the transmitting signal of the transmitting antenna array on the signal received by the receiving antenna array in the same transceiver in a full-duplex wireless communication system with the millimeter wave band as the carrier frequency. Eliminates self-interference between the transmit and receive antenna arrays. The signal transmitting method includes: determining the position of the receiving antenna array; transmitting a signal through the transmitting antenna array using a beamforming technique, wherein when transmitting a signal using the beamforming technique, the position of the receiving antenna array is used as a null position, and The transmit antenna array is located in the same transceiver as the receive antenna array.

The invention discloses a self-interference elimination method of a full duplex system. Each full duplex node comprises a symbol modulator, a sending module, a receiving module and two antennae, wherein the data of the multiple continuous time slots are collected for algebraic operation so as to eliminate self-interference by virtue of the receiving module of the node, after a converted receiving signal is obtained, the signal is demodulated by virtue of a maximum likelihood method. The sending module can send a symbol by virtue of a method of a constellation point of a rotating symbol modulator, a demodulation mistake of an inherent mode during a process of demodulating the converted receiving signal is avoided. The self-interference elimination method not only can be used in a common full duplex system, but also can be used in an airspace modulation full duplex system, the self-interference is eliminated by virtue of the self-interference elimination method, and the estimation of a self-interference communication channel is not carried out; the signal-to-noise ratio is improved, the equipment cost is lowered, the communication efficiency is improved, and the self-interference elimination method has great economic value for a communication equipment manufacturer and a communication operator.

The invention discloses a full-duplex self-interference cancellation method in combined spatial domain and polarization domain, so that that invention belongs to the field of wireless commuication technology, includes using antenna isolation in space domain to cancel self-interference, converting multiplicative phase noise interference of self-interference signal into additive noise interference,using reconstructed self-interference signal to cancel self-interference through estimation compensation, and finally receiving and recovering desired signal through polarization matching. At the sametime, the invention considers the influence of the spatial characteristic and the polarization characteristic in the canceling method on the full-duplex self-interference, realizes the full-duplex self-interference canceling without being influenced by the phase noise, and can improve the self-interference canceling quantity performance and the system data rate performance.

The invention discloses a method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under the influence of power amplifier nonlinearity based on a polarized oblique projection, and belongs to the technical field of wireless communication. In the method, an oblique projection matrix is constructed at a receiving end according to polarization states of a self-interference signal and a desired signal through a polarization domain of signals, and self-interference is projected onto a null space of the projection matrix, so that the aim of eliminating self-interference is fulfilled, and the desired signal can be kept. Through adoption of the method, modeling of the power amplifier nonlinearity is not needed; no complicated pre-estimation algorithm is used; high real-time performance is achieved; and self-interference of a system can be eliminated effectively under the condition that system transmitting power increases continuously.

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 correlation rotation precoding method applied to a GFDM communication system. The problem of relatively low symbol error rate transmission performance of a generalized frequency division multiplexing GFDM communication system in the prior art is mainly solved. The related rotation precoding method comprises the following specific steps: (1) constructing an autocorrelation matrix; (2) constructing a zero forcing precoding matrix; (3) constructing a correlation rotation matrix; (4) eliminating a multiplicative channel fading factor; (5) constructing a correlation rotation precoding matrix; (6) precoding; and (7) transmitting a to-be-transmitted symbol. The correlation rotation precoding method disclosed by the invention has the advantages of high symbol error rate performance, adverse effects caused by self-interference and multi-path channel interference can be simultaneously eliminated, the interference is utilized to improve the symbol error rate transmission performance of the generalized frequency division multiplexing GFDM communication system, meanwhile the precoding processing method of signals is simple and feasible, and the signal transmission requirements of users in a real environment can be satisfied in a multi-path channel scene.

The invention discloses a nonlinear digital self-interference cancellation device and method applied to a full-duplex communication transceiver. The nonlinear digital self-interference cancellation device applied to the full-duplex communication transceiver comprises a pre-whitening module, adaptive filters A and B and an adder; the pre-whitening module is used for pre-whitening a baseband waveform signal x(n) of a transmitter end and a linear mirroring component, a nonlinear component and a mirroring nonlinear component thereof; the adaptive filters A and B are used for performing iterative operations using a pre-whitening enhanced two-channel nonlinear complex number least mean square error adaptive algorithm according to the real parts or imaginary parts of an output signal of pre-whitening module and an output signal at the last iteration, obtaining an estimation of each main interference component in an observation signal d(n) of a receiver end, and eliminating each main interference component from d(n) and outputting; and the adder is used for taking the output of the adaptive filter A as the real part and the output of the adaptive filter B as the imaginary part, and addingthe real part and the imaginary part as a digital self-interference removed signal e(n) to output. The invention has a lower complexity.

The invention provides a method and device for eliminating same frequency full duplex system self-interference. The method comprises steps of establishing a link with a terminal having a registration authority, negotiating a special purpose upstream extended code and a special purpose downstream extended code with the terminal having the registration authority, wherein the special purpose downstream extended code is different from the upstream extended code; using the special purpose upstream extended code and the special purpose downstream extended code to perform same frequency full duplex communication with the terminal having the registration authority. The method of the invention adopts an interference randomized method to perform extension on a signal of an emission link, enables the in-band modulation interference of the emission link to be white-noised and eliminates the self-interference during the same frequency full duplex communication.

The invention belongs to the field of 5G communication, and relates to a method for designing a robust hybrid transceiver of a point-to-point millimeter wave full duplex system. The method comprises the following steps: performing singular value decomposition on an estimated channel to obtain an analog transceiver; constructing an equivalent transmission channel for the analog transceiver, and partially initializing a digital transmitter through equivalent transmission channel estimation; acquiring a digital receiver by updating calculation of the digital transmitter; constructing a self-interference equivalent channel based on the updated digital transmitter, analog transmitter and analog receiver; taking a null space obtained by performing singular value decomposition on the self-interference equivalent channel as an SIC receiver; and calculating the product of the analog receiver, the digital receiver and the SIC receiver and the product of the analog transmitter and the digital transmitter, and designing to obtain the hybrid transceiver. The invention designs a system hybrid transmitter without considering self-interference, designs a self-interference elimination matrix and adds the self-interference elimination matrix into a receiver to finish the design of the hybrid transceiver;.

The invention provides a real-time adaptive optical self-interference elimination system and a real-time adaptive optical self-interference elimination method based on FPGA and STM32. The real-time adaptive optical self-interference elimination method comprises the following steps: a baseband real-time transceiving module completes real-time transmission of baseband OFDM signals; the up-down frequency conversion module completes conversion between the baseband of the signal and the working frequency band of the antenna to obtain a radio frequency signal of local communication information; a radio frequency signal of the local communication signal is copied into a reference signal, and is sent through a radio frequency antenna module; the radio frequency antenna module receives a radio frequency useful signal from another communication unit and a time-varying radio frequency self-interference signal of a transmitting antenna close to the receiving antenna; after the optical self-interference elimination module receives a useful signal and a self-interference signal, the amplitude and phase of a reference signal are adjusted through the self-adaptive control module, the reference signal and the self-interference signal are cancelled out through a balance photoelectric detector in the optical self-interference elimination module, and the useful signal after self-interference elimination is obtained; and the useful signal after elimination of the self-interference is converted to a baseband and then is sent to a receiving end.

The invention provides a physical signal transmission method and device and a physical signal resource allocation method and device. The physical signal transmission method for the IAB node comprises the following steps: acquiring a configuration parameter for sending a physical signal; when a terminal function entity uplink sending link, a terminal function entity downlink receiving link, a base station function entity downlink sending link and a base station function entity uplink receiving link of an IAB node carry out simultaneous and same-frequency full duplex transmission, sending an uplink physical signal sent by a terminal function entity of the IAB node and a downlink physical signal sent by a base station function entity of the IAB node on the same time domain resource according to the acquired configuration parameters.

The invention relates to the technical field of wireless channel simulation. The present invention provides a self-interference elimination method applied to the radio frequency port of a wireless channel simulator. Interference of self-interference signals on the port of the wireless channel simulator is eliminated, a calculation part which consumes relatively overlarge resources is achieved through software, a hardware part is only responsible for synthesizing reverse signals of the self-interference in real time, and software is reasonably controlled to realize time delay of an estimation part, so that new self-interference amplitude and phase are estimated before a self-interference signal changes in a large range, and self-interference elimination can be realized under the condition of extremely low hardware resource overhead. Meanwhile, key timing synchronization, amplitude estimation and phase estimation are all checked, and the error data size and the accidental error rate can be effectively reduced through comparison between historical threshold data and actually obtained real-time data.

Embodiments of the application disclose a self-interference elimination method, a terminal and a computer storage medium. The self-interference elimination method is applied to a terminal equipped with two transmitting antennas, wherein the terminal is also equipped with an inverter and a delay module. The self-interference elimination method comprises the steps of: transmitting a first signal X according to n time units through a first transmitting antenna, wherein the n is an integer greater than 1; controlling a second transmitting antenna to transmit a second signal Y according to n time units through the inverter and the delay module, wherein the X and the Y are the same in size and opposite in phase; and receiving an integral receiving signal P according to n+1 time units through a receiving antenna.

The present application relates to the field of wireless communication, in particular to the channel detection technology in the wireless communication system. In a full-duplex channel detection method, an access point AP (Access Point) generates channel detection information, wherein the channel detection information includes at least: the identification information of the first station STA (Station) and the link status of the first STA , and, the identification information of the second STA and the link state of the second STA; wherein, the link state of the first STA is an uplink sending state, and the link state of the second STA is a downlink receiving state; the AP sends channel detection information; The STA determines its own corresponding link state according to the channel detection information; further, the AP and the STA which knows its own link state respectively perform full-duplex channel detection and mutual interference channel detection. Through the solution provided in this application, full-duplex channel detection is realized, so as to eliminate self-interference and mutual interference, which is beneficial to improving system throughput and transmission efficiency.