5results about How to "Increase security rate" patented technology

According to the robust beam forming method for the AN enhanced RIS assisted physical layer security communication, the transmitting power of a base station is minimized on the premise that the system service quality requirement and the security rate outage probability constraint are met. The method comprises the following steps: firstly, constructing a security rate interruption constraint based on a base station-RIS-eavesdropper cascade channel transmitting end imperfect CSI model, and then approaching a security rate interruption probability constraint by using a Bernstein inequality, thereby reexpressing an original problem as a processable convex constraint. Under an alternating iterative optimization framework, positive semi-definite relaxation is utilized to convert a sub-problem into a convex problem, a sub-optimization problem of a given beam forming vector optimization RIS phase shift matrix is rewritten, a slack variable is introduced to re-express an original feasibility verification problem, and finally a base station transmitting beam forming vector is iteratively optimized. The AN beam forming vector and the RIS reflection beam forming matrix improve the system safety rate and the system robustness.

The invention discloses a method and equipment for resisting perception and communication double eavesdropping, and a medium. The method for confronting double eavesdropping of perception and communication comprises the following steps: constructing a communication and sensing integrated system model; calculating channel gains between the unmanned aerial vehicle and the communication user and between the unmanned aerial vehicle and the eavesdropper; acquiring signal to interference and noise ratios of a communication user receiving end and an eavesdropper receiving end, which are respectively related to the waveform optimization variable and the unmanned aerial vehicle trajectory, and calculating a system physical layer safety rate sum; obtaining beam gains at the sensing target and the eavesdropper; the sum of the safety rates of the physical layers of the system is used as an objective function of an optimization problem, and constraint conditions such as maximum transmitting power, perception, perception safety and unmanned aerial vehicle tracks and a common inductance integrated system model are combined to construct an unmanned aerial vehicle track and resource scheduling joint optimization model and solve the unmanned aerial vehicle track and resource scheduling joint optimization model; and an unmanned aerial vehicle track and resource scheduling joint optimization scheme combining physical layer security and perception security based on communication and sensing integration is obtained.

The present invention belongs to the field of wireless communication technology, and specifically relates to an improved interference alignment secure transmission method for avoiding elimination of useful signals; the method comprises: a confidential transmitting end sends a confidential signal to a receiving end, and a non-confidential transmitting end sends a non-confidential signal to a receiving end; the receiving end comprises a confidential receiving end, a non-confidential receiving end and an eavesdropping user; an improved interference alignment algorithm for avoiding elimination of useful signals is used to process the transmitting signal and the receiving signal to obtain a transmitting scheme and a receiving scheme; a maximum security rate objective function is constructed according to the transmitting scheme and the receiving scheme; the maximum security rate objective function is solved to obtain an optimal power allocation scheme for a confidential transmitting end; and signal secure transmission is performed according to the transmitting scheme, the receiving scheme and the optimal power allocation scheme for a confidential transmitting end; the present invention avoids the problem that a traditional interference alignment algorithm may cause elimination of useful signals, and can guarantee the service quality of confidential users to the greatest extent on the basis of ensuring security performance.

The invention provides a dual unmanned aerial vehicle (UAV) trajectory optimization method and system applied to a multi-eavesdropper and no-fly zone coexistence scene. The method comprises the following steps: constructing a communication system model; constructing an optimized mathematical model with user scheduling, unmanned aerial vehicle beamforming and unmanned aerial vehicle flight path as constraints by taking maximization of the user safety rate as a target according to the communication system model; a block coordinate descent method is adopted to decouple the optimized mathematical model into sub-problems only about user scheduling, unmanned aerial vehicle beam forming and flight tracks of the unmanned aerial vehicle U and the unmanned aerial vehicle J; for each non-convex sub-problem, a convex approximation method is adopted to convert the non-convex sub-problem into a convex optimization form; an iterative algorithm is adopted to sequentially solve user scheduling, unmanned aerial vehicle wave beam occurrence and convex subproblems of flight paths of the user scheduling and the unmanned aerial vehicle wave beam occurrence, and finally successive approximation is carried out and a global optimal solution of an original overall optimization problem is obtained; according to the method, the waveform and the track are jointly optimized, and the eavesdropping capability of an eavesdropper is effectively interfered by using a radar signal, so that safe communication between the unmanned aerial vehicle and a ground user is ensured, and the method has obvious innovativeness and uniqueness in system design and application scenes.

An OTFS secure transmission method, system, device, and medium based on integrated induction and frequency domain power allocation; the method involves generating an OTFS transmission frame X with signal-guide fusion. DD After OTFS modulation and up-conversion processing, the transmitted OTFS signal s is obtained. RF (t); Receive user-received OTFS signal s RF (t) and reflect to generate an echo signal. The transmitting end performs OTFS reception and demodulation on the echo signal to obtain the DD domain echo frame estimate of the DD domain channel impulse response; derives the optimal power allocation scheme in the TF domain under secure transmission conditions; builds a channel physical layer security analysis model; the system, equipment and medium are used to implement the method; this invention uses an integrated inductive and communication system based on OTFS modulation to estimate the DD domain channel impulse response using the echo signal, and performs optimal power allocation in the frequency domain through the channel impulse response, thereby improving the signal-to-noise ratio of the received signal and enhancing the security of information transmission.