Research On Energy-efficient And Secure Transmission Technology Based On Storage Assistance

With the advancement of communication and computing technology,the mobile Internet has achieved unprecedented tremendous development.The rapid development of the mobile Internet makes wireless communication technology face critical challenges.On the one hand,how to design a secure and efficient wireless transmission technology to increase the wireless communication transmission bandwidth and improve the spectral efficiency and energy efficiency of the wireless communication transmission link has been the core issue of wireless communication network design.On the other hand,with the rapid development of wireless communication technology,a large amount of privacy information is transmitted along with wireless networks.Due to the broadcast characteristics of wireless media,these privacy information are easily overheard by illegal users.In a wireless network,how to achieve secure and efficient wireless transmission without increasing the transmission power and degrading the spectrum efficiency has become an urgent problem.In this thesis,we focus on the physical layer security in wireless communication network.In particular,we will study how to realize the physical layer security by using the gaming theory and reinforcement learning,how the buffer-aided transmission strategy enhance the secure transmission performance,and how to devise effective secure transmission in mobile relay scenarios to attain reasonable secure transmission performance.And the physical layer security issue in wireless communication networks will be investigated in-depth from three perspectives,namely,the system model,transmission mechanism design and the achievable security performance of the system.Firstly,the energy-efficient and secure Multi-Input and Multi-Output(MIMO)transmission network in the presence of smart attackers is studied.On the one hand,in order to make the MIMO transmitter not only resist malicious attacker,but also realize reasonable energy efficiency.To this end,new game between MIMO transmitter and malicious attacker is formulated to take into account the energy efficiency of the MIMO transmitter.On the other hand,because the energy efficiencyrequirement tends to reduce the transmission power by the MIMO transmitter,which may degrade the realized security performance in adverse environment,the probabilistic transmission strategy was employed to further enhance the secure transmission.The analysis results unveil that,the proposed energy efficient secure MIMO transmission design can not only ensure reasonable security performance,but also noticeably improve energy efficiency performance.Secondly,the buffer-aided wireless energy harvesting two-way secure relay network is studied,in which two users exchange information with the assistance of one buffer-aided relay that harvests energy from two users.In order to realize the confidential message exchange between two users in the presence of malicious eavesdropper,a time division broadcast(TDBC)based secure bidirectional relaying scheme is proposed,in which one user sends artificial noise to suppress the eavesdropper when another user transmits data to the relay.The secure sum rate maximization problem is formulated subject to the average and peak transmit power constraints,the data buffer and energy storage causality,and the transmission mode constraints.By employing Lyapunov optimization framework,a security-aware adaptive transmission(SAAT)scheme is proposed to jointly adapt the transmission mode selection,power allocation and secure rate allocation according to the channel/buffer/energy state information(CSI/BSI/ESI).Our analysis unveils that the average achievable secrecy rate region can be significantly improved,and there exists an inherent tradeoff among the transmission delay,the required transmit power consumption,and the realized secure achievable sum rate.Finally,the buffer-aided UAV secure communication network with joint trajectory optimization is studied.the secure transmission technique in a buffer-aided UAV based relay communication network in the presence of a fixed eavesdropper node was studied.The achievable secrecy rate maximization problem was formulated subject to the average transmit power constraints,peak transit power constraints,and the UAV flight trajectory constraints.Our analysis explicitly explicate the effects of data buffer provisioned at the UAV relay on the average achievable secrecy rate and the optimized UAV flight trajectory.It is shown that,the average achievable secrecyrate can be significantly improved by introducing the data buffer at the UAV relay.Moreover,the relationship between the average data queue size and the optimized UAV flight trajectory is analyzed to show that,the flight trajectory of UAV changes with the size of the data queue and the trends are similar.In summary,this article has conducted in-depth research on the physical layer security transmission technology,explored the trade-off relationship between secrecy capacity and energy efficiency,and explored data buffer and energy storage for user scheduling,power allocation,secrecy rate allocation,energy transmission,and The influence of UAV flight trajectory,and revealed the trade-off relationship between secure transmission rate,energy consumption and transmission delay.