Research On Resource Allocation Based On Improved Simulated Annealing Algorithm In Physical Layer Security Communication

With the popularity of wireless technology,the information security problem brought by the openness of wireless channel is attracting more and more attention.Physical layer security technology is a secrecy mechanism that encrypts information in the physical layer.It can better solve the problem of information security in wireless communication,compared to the traditional encryption algorithm,which encrypts sensitive information with the key in the network layer.Physical layer security technology has become a hot spot in the field of information security.Although there are some achievements in the research of physical layer security communication at present,most of the research focuses on simple communication systems.In view of the complex M-MIMO system,there is less in-depth research on the existing physical layer security research.Compared with the traditional MIMO system,M-MIMO system can send the target signal more effectively,prevent the signal from leaking,and effectively enhance the system security performance.In the M-MIMO system,due to the increase of the number of antennas,the rational allocation of limited resources on transmitting antennas becomes particularly important.Considering the M-MIMO system,this paper studies the security performance of the MIMOME wiretap channel based on the more general Nakagami-channel.In order to solve the problem that it is difficult to allocate resources by traditional mathematical analytic method in MIMOME wiretap channel,an improved simulated annealing algorithm is proposed in this paper,which will avoid complicated theoretical analysis and calculation,effectively improve the efficiency of resource allocation and enhance the security performance of massive MIMOME system.The main work of this paper is summarized as follows:1.Security performance analysis is the foundation of the research on physical layer security.This paper analyzes the security performance of SISOSE wiretap channel based on the Nakagami-channel and simulates the effective secrecy throughput under the SISOSE wiretap channel model.The numerical results show that,the effective signal transmission rate,the channel parameters and the power allocation have great influence on the effective secrecy throughput.2.In order to solve the optimization problem of complex resource allocation in mmM-MIMO system,an improved simulated annealing algorithm is introduced,for which an adaptive perturbation method is used.That method can automatically adjust strategies to generate new solutions according to the change of real-time temperature.Performance test shows that,the improved simulated annealing algorithm has the better convergence performance,compared to the classical simulated annealing algorithm.3.Based on the performance analysis of SISOSE eavesdropper channel model,this paper researches on the security performance and resource allocation algorithm of massive MIMOME wiretap channel,and proposes a resource allocation scheme of massive MIMOME system based on the improved simulated annealing algorithm.This scheme uses the improved simulated annealing algorithm proposed in this paper to optimize the effective signal transmission rate and transmission power allocation(power allocation among antennas,power allocation between the transmission signal and the artificial noise on each antenna)of the massive MIMOME system.Numerical results show that,the resource allocation scheme based on the improved simulated annealing algorithm not only can get the approximate optimal solution of resource allocation without the complex mathematical analysis,but also has the advantages of strong convergence and high stability.In general,the improved simulated annealing algorithm can efficiently and reasonably allocate resources for massive MIMOME system.