42results about How to "Increase confidentiality capacity" patented technology

The invention provides a CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization. The CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization comprises the steps of: establishing a system model; initializing a quantum population and system parameters, so that mapping modes of quantum individuals are obtainedthrough a mapping rule; calculating adaptive values of the quantum individuals, and taking the quantum individual, the adaptive value of which is the maximum in the quantum population, as the globallyoptimal solution; generating new quantum individuals through evolution and crossover strategies; obtaining mapping modes of the new quantum individuals according to the mapping rule, calculating adaptive values, and updating the quantum population and the globally optimal solution through greedy selection; if the iteration time is less than the pre-set maximum iteration time, returning to the fourth step; and otherwise, ending iteration, and outputting the globally optimal solution, so that an optimal power distribution scheme is obtained. According to the CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization provided by the invention, the spectrum utilization rate is effectively increased; self-interference and mutual interference of base stations and users are sufficiently considered; the secrecy capacity of a system is increased to a great extent; and a new solution is provided for the power distribution problem of a complex system.

The invention discloses a method, system and device for detecting a wiretapping pilot signal sent by an illegal user. The method comprises the following steps: receiving pilot signals sent by a legaluser and an auxiliary user in a first time slot, receiving a pilot signal sent by the legal user in a second time slot, and receiving a pilot signal sent by the auxiliary user in a third time slot; respectively calculating reverse channel estimation results according to the pilot signals received in the first, the second and the third time slots; and according to the calculated reverse channel estimation results, determining a channel of the legal user and whether the illegal user sends the wiretapping pilot signal or not. The method, system and device provided by the invention has the advantages that the deceitful pilot signal and the illegal user can be detected, so that wiretapping of the illegal user can be prevented, and high information security of the legal user can be guaranteed.

A physical layer security method and system based on resource allocation in V2V communication, which can improve system security performance, and belongs to the technical field of wireless communication. The present invention includes: S1. When an eavesdropper eavesdrops on the confidential information of all vehicle user equipment VUEs in the cellular network, so as to maximize the sum and confidentiality capacity of all vehicle user equipment VUEs, allocate and multiplex the vehicle user equipment VUE and cellular user equipment CUE subcarriers, VUE and CUE have the same priority; when the eavesdropper only eavesdrops on the secret information of some VUEs in the cellular network, in order to maximize the sum of the secret capacity of the eavesdropped VUE and the channel capacity of the uneavesdropped VUE, Assign multiplexed subcarriers to VUE and CUE, and VUE and CUE have the same priority; S2. According to the subcarrier allocation result of S1, solve the transmission power of VUE and CUE that multiplex corresponding subcarriers.

The invention discloses a multi-relay physical layer safety method based on known eavesdropping end channel information to achieve safety communication of a physical layer. Based on known eavesdropping end channel information, a relay group is divided into a relay forwarding group part and a relay interference group part, effectiveness and safe transmission of information are guaranteed for a first information transmission time slot by means of the beam forming technology and the artificial interference technology, and information is effectively prevented from being received by an eavesdropping end in a second time slot by means of the known eavesdropping end channel information and the beam forming technology. On the premise that relay power distribution is considered, the beam forming vector of the relay forwarding group part and the beam forming vector of the relay interference group part are optimized, and the maximum safe capacity of a system is obtained finally.

The invention provides a mobile device position control method and a device based on single bit feedback. The method comprises steps: useful signals sent by a source-end device and artificial noise signals sent by a target-end device are received at the same time; the useful signals and the artificial noise signals are processed to acquire processed signals, and the processed signals are sent to the target-end device; feedback information returned for the processed signals by the target-end device is received, wherein the feedback information is used to indicate whether the secrecy capacity of the communication system is promoted simultaneously with the eavesdropping capacity of the mobile device; and according to the feedback information, a moving position is determined, and the current position of the mobile device is moved to the moving position. The embodiment of the invention can control the moving position of the mobile device, the secrecy capacity of the communication system is further optimized, and safety communication is ensured to be lasted.

The invention discloses a method, system and device for detecting a wiretapping pilot signal sent by an illegal user. The method comprises the following steps: receiving pilot signals sent by a legaluser and an auxiliary user in a first time slot, receiving a pilot signal sent by the legal user in a second time slot, and receiving a pilot signal sent by the auxiliary user in a third time slot; respectively calculating reverse channel estimation results according to the pilot signals received in the first, the second and the third time slots; and according to the calculated reverse channel estimation results, determining a channel of the legal user and whether the illegal user sends the wiretapping pilot signal or not. The method, system and device provided by the invention has the advantages that the deceitful pilot signal and the illegal user can be detected, so that wiretapping of the illegal user can be prevented, and high information security of the legal user can be guaranteed.

The invention provides a secure communication method based on feedback under a MIMO eavesdropping channel. The secure communication between a target user possessing N transmitting antennas and a source end is realized, and the eavesdropping of an eavesdropper is prevented. The secure communication method is characterized in that the feedback performance gain of the source end as the receiving end is optimized, so that the receiving signal-to-noise ratio of the source end is higher than the eavesdropper. The secure capacity of the MIMO eavesdropping channel is improved, not only can be the receiving signal-to-noise ratio of the legal receiving end improved, but also can be the feedback performance gain of the MIMO eavesdropping channel enlarged. A theoretical simulation experiment shows that the feedback performance gain is in a linear increasing relation along the increasing of the signal-to-noise ratio; and meanwhile, the theoretical simulation shows that the security gap between the legal receiving end using the protocol and the eavesdropping end is increased along the increasing of the transmitting antenna number and / or signal-to-noise ratio.

The invention provides a CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization. The CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization comprises the steps of: establishing a system model; initializing a quantum population and system parameters, so that mapping modes of quantum individuals are obtainedthrough a mapping rule; calculating adaptive values of the quantum individuals, and taking the quantum individual, the adaptive value of which is the maximum in the quantum population, as the globallyoptimal solution; generating new quantum individuals through evolution and crossover strategies; obtaining mapping modes of the new quantum individuals according to the mapping rule, calculating adaptive values, and updating the quantum population and the globally optimal solution through greedy selection; if the iteration time is less than the pre-set maximum iteration time, returning to the fourth step; and otherwise, ending iteration, and outputting the globally optimal solution, so that an optimal power distribution scheme is obtained. According to the CCFD-Massive MIMO system power distribution method based on quantum backtracking search optimization provided by the invention, the spectrum utilization rate is effectively increased; self-interference and mutual interference of base stations and users are sufficiently considered; the secrecy capacity of a system is increased to a great extent; and a new solution is provided for the power distribution problem of a complex system.

The invention discloses a design method and a device of a hybrid beamforming filter based on the safe communication of a millimeter wave MIMO system. The method includes: whether there is an eavesdropping channel is judged, if yes, analog beamforming filters are constructed according to the MIMO channel information corresponding to the eavesdropping end, otherwise the MIMO channel information ofthe legal channel is directly set as the initial matrix of iterative solution, and the analog beamforming filters are constructed. The digital beamforming filters obtained are all based on the SVD method. Based on the sparsity of millimeter wave channel and the limitations of analog filter design in millimeter wave system, considering the awareness of eavesdropping channel information, analog beamforming filter based on code-local joint selection of sender and receiver can improve the security capacity of MIMO system easily and efficiently, and make the mature physical layer security technology in traditional MIMO system, namely beamforming technology, be better transplanted to millimeter wave MIMO system.