2results about How to "Increase security rate" patented technology

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.