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

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 signal emission method and device. The method and device are applied to a full-duplex wireless communication system in the carrier frequency of millimeter waveband to eliminate interference of an emission signal of an emission antenna array in a reception signal of a reception antenna array of the same transceiver as well as self interference between the emission antenna array and the reception antenna array. The signal emission method comprises that the position of the reception antenna array is determined; and the emission antenna array emits signals by using a wave beam shaping technology. When the signal is emitted in the wave beam shaping technology, the position of the reception antenna array is null position, and the emission antenna array and the reception antenna array are placed in the same transceiver.

A shared device of CDMA and TDMA single frequency point is prepared as series-connecting output end of base band signal processor in data circuit of each path voice, scrambler, address code circuit, gain regulator, adder, the first multiplexing scramble code circuit, etc in sequence; series-connecting high speed data user signal D via 1xEV-Do base band processor, series / parallel converter, pulse amplitude modulation converter, etc in sequence; connecting output of orthogonal amplitude modulation circuit to antennal and connecting output end of radio frequency processor to disturbance set- off and user data demodulator.

The invention belongs to the technical field of radio transmission and discloses a full duplex relay transmission method based on loop interference reconstruction cancellation. The full duplex relay transmission method comprises the steps of estimating channel parameters; enabling a source node to modulate an information source signal; enabling a relay node to forward an emission signal of the source node; and enabling a destination node to decode the received emission signal of the relay node. According to the full duplex relay transmission method, the shortage that the complexity of the relay node is increased due to the fact that residual loop interference of the relay node is processed in the prior art is overcome, the full duplex relay transmission method has the advantage of simplifying a processing process of the relay node, and the complexity of the relay node is reduced; the signal transmission is performed by using OFDM (Orthogonal Frequency Division Multiplexing) without a cyclic prefix and the reconstruction cancellation is performed on the loop interference, so the consumption of a system spectrum resource by the cyclic prefix is reduced, and the spectrum utilization rate of a full duplex relay cooperative communication system is further improved; the signal to interference and noise ratio of a receiving end of the destination node is maximized under a condition inwhich the residual loop interference does not need to be further cancelled, and the reliability of the full duplex relay cooperative communication system is improved.

The invention provides a self-interference suppression multi-stream diversity BD precoding method and device. The method comprises the steps that a base station acquires all user channel matrixes; the interference matrix of each user receiving antenna is determined to construct the zero space orthogonal basis of all receiving antennas of users; the self-interference suppression equivalent channel matrix of each user is constructed, and then the multi-stream diversity BD precoding and receiving decoding matrix of each user is constructed; multi-stream diversity BD precoding is carried out on original signals sent by a base station to each user, and added signals are transmitted from the base station; users process the received signals through a corresponding received decoding matrix; and data streams received by each user are merged, and original transmission data of the user are estimated. According to the invention, the technical problem of self-interference between receiving end antennas in a MU-MIMO system is solved; multi-user interference is eliminated; self-interference of an equivalent channel is suppressed; multiple data streams are merged to increase the spatial diversity gain; the reliability is improved; and the method and device are used for anti-interference in the field of wireless communication.

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 precoding method, a multi-carrier transmission method, a transmitter, a receiver and a communication system. The multi-carrier transmission method includes: S1, performing QAM modulation processing and first serial-to-parallel conversion on the transmission data, and performing precoding processing; S2, performing GFDM modulation; S3, performing space-time coding processing to obtain the first transmission data and the second transmission data ; S4, remove the cyclic prefix, and perform frequency domain equalization processing; S5, perform matched filter demodulation processing on the frequency domain equalized data; S6, perform deprecoding processing; S7, perform interference equalization processing sequentially after deprecoding processing, the second Serial-to-parallel conversion processing and QAM demodulation processing to obtain transmission data. Utilization GFDM self-interference matrix after matched filter demodulation is a block cyclic matrix, which can be decomposed to obtain a precoding matrix, and the corresponding de-precoding operation and residual interference removal can be performed at the receiving end, which can completely eliminate the self-interference of the system. Improve the bit error rate performance of the system.

The invention belongs to the field of 5G communication, and relates to a design method of a robust hybrid transceiver for a point-to-point millimeter-wave full-duplex system; the design method includes performing singular value decomposition on an estimated channel to obtain an analog transceiver; The equivalent transmission channel is created, and the digital transmitter is partially initialized through the equivalent transmission channel estimation; the digital receiver is calculated by updating the digital transmitter; the construction based on the updated digital transmitter, analog transmitter and analog receiver is derived from The interference equivalent channel; the null space obtained by carrying out singular value decomposition from the interference equivalent channel as the SIC receiver; 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 , the design gets a hybrid transceiver. The present invention firstly does not consider self-interference, designs a system hybrid transmitter, designs a self-interference elimination matrix and adds it to a receiver, and completes the design of a hybrid transceiver.