Physical layer safety communication method for multi-input and single-output wireless energy-carrying communication system

Abstract

The invention discloses a physical layer safety communication method for a multi-input and single-output wireless energy-carrying communication system. The method has the advantages that a transmitting end carries out the optimal beam forming on artificial noises through channel status information of wiretap channels, so that the artificial noises in a specific direction can be generated in a space, targeted interference effects for wiretap terminals can be improved, and the system safety capacity can be remarkably increased; a continuous convex approximation method in a CVX tool kit is used to calculate the optimal value, second-order Taylor expansion and approximation is carried out on an optimization function at each iteration starting point of the optimization function, and the local close approximation of the optimization function is calculated under strictly convex restrictions of restriction conditions, so that a high algorithm convergence speed is achieved; and in considerationof the nonlinearity of an actual energy receiver internal circuit structure, a nonlinear energy receiver model is adopted, which is more practical and avoids mismatching in resource allocation and system performance declines caused by the mismatching.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a physical layer security communication method suitable for a multi-input single-output wireless energy-carrying communication system. Background technique [0002] Wireless energy-carrying communication technology can use radio frequency signals to realize simultaneous transmission of wireless information and energy, which is an important way to solve the problem of limited energy in wireless networks and realize green communication. Compared with traditional wireless communication systems, the security issues of wireless portable energy communication systems are more prominent. In a wireless energy carrying communication system, the energy receiver has higher power sensitivity than the information receiver, and the confidential information sent by the sender to the information receiver is very easy to be eavesdropped by the energy receiver. As a solution to the ...

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Problems solved by technology

The publication number is CN107896125A, and the publication date is April 10, 2018. The invention patent "A physical layer secure transmission method for a full-dimensional multi-antenna SWIPT system" proposes a three-dimensional beamforming with the goal of maximizing the safe transmission rate algorithm, but this method uses the Lagrangian relaxation optimization algorithm to solve the optimal value, which has high computational complexity and slow convergence speed; and ignores the influence of the nonlinear characteristics of the energy receiver on the performance of the algorithm

The publication number is CN108337675A, and the publication date is July 27, 2018. The invention patent "A Physical Layer Security Communication Method Based on Waveform Design Suitable for Single-Antenna Systems" proposes to minimize the signal-to-interference-noise ratio of the signal received by the eavesdropper It is a method for self-adaptive optimization of the spread spectrum communication waveform at the sending end according to the eavesdropping channel information, but the invention uses the dichotomy method to solve the optimal value, the convergence speed is slow, and the calculation time is long; the artificial noise signal is in the zero channel space of the legal channel Isotropic on the surface, the pertinence to the interference of the eavesdropping terminal is not strong; the influence of the nonlinear characteristics of the energy receiver on the performance of the algorithm is ignored, and it is easy to cause a mismatch of resource allocation, resulting in a decrease in system performance

[0004] To sum up, in the existing physical layer security communication methods of wireless energy-carrying communication systems, the method of beamforming the transmitted signal is complex in calculation and slow in convergence speed; The space is evenly distributed, and the pertinence to the eavesdropping interference is not strong; and the ideal linear energy receiver model is considered, and the influence of the nonlinear characteristics of the actual energy receiver circuit on the performance of the algorithm is ignored

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