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.