Research On The SWIPT Modeling And Secure Transmission Based On Renewable Energy Harvesting

With the improvement of throughput and spectrum efficiency of wireless communication systems,the energy consumption and security of wireless communication systems are attracting more and more researchers' attention.As a kind of green energy,renewable energy can be used in wireless communication systems to solve the energy problem effectively.Therefore,the wireless communication system with capability of Energy Harvesting(EH)is the future direction of energy supply for wireless communication.However,the volatility of renewable energy is a difficult problem to be faced.Therefore,the optimization of energy supply for renewable energy-powered wireless communication systems has become a research hotspot.As a kind of energy harvesting technology,Simultaneous Wireless Information and Power Transfer(SWIPT)technology can realize the simultaneous transmission of energy and information,and provides a solution to the problem of power supply of wireless nodes.However,the open link feature of wireless channel makes the information transmitted by broadcasting method to face serious security problems.As a complementary method of traditional information security,physical layer security technology is becoming the hotspot of current research.Therefore,it is an effective way to solve the problem of energy consumption and secure transmission in wireless communication systems by studying the combination of green energy supply and physical layer security in wireless communication systems.In this paper,a three-node wireless communication model based on simultaneous transmission of information and energy is designed.The energy harvesting technology is used to obtain renewable energy,and the system is divided into multiple time slots.Renewable energy combined with grid energy provides hybrid energy for the transmit node.The limit filling-water algorithm is proposed to ensure that the grid energy consumption being minimized.In the transmission process,artificial noise is utilized to achieve secure transmission,and the effectiveness of the scheme is verified by MATLAB simulation.Then,the cooperative nodes are extended based on this model.A multi-slot and full-duplex SWIPT system model is proposed.In this model,jammer based on energy harvesting is designed and cooperative jamming(CJ)is constructed to reduce eavesdropping signal to noise ratio.The gradient adaptive principle is used to carry out parameter self-adaptive extremum search for the power proportion of jammer wirelessly transmitted by the source node and power collection coefficient.Combined with the feedback gain parameter,the total power sent by the source node per slot is determined.According to the proposed limit filling-water algorithm,the random arrival of renewable energy is dynamically optimized.The simulation results show that the scheme is feasible.Finally,a multi-hop link transmission model based on beamforming is proposed,and a system with power beacon(PB)is established.According to the Rayleigh distribution of wireless channels,statistical knowledge is used to derive the security outage probability(SOP)expressions in different scenarios.A two-stage beamforming scheme is proposed to achieve the purpose of directed coverage of power beacon and interference noises,which ensures the energy collection of relay nodes and the secure transmission of information.Simulation results confirm the validity of the proposed outage probability expression.