Research Of Physical Layer Encryption Technology In The Next Generation Wireless Communication

With the rapid development of mobile communication technology,especially the fifth generation of mobile communication technology(5G)is about to be officially put into commercial use,the importance of communication security is becoming more and more prominent,and existing security technologies face enormous challenges.Massive multiple-input multiple-output(Massive MIMO)technology is adopted in 5G.The network scale is larger and the networking form is more flexible,which makes the communication network face from hardware to software to network management.With security challenges,eavesdropping and attack technologies for wireless communication networks are also developing rapidly,and the fragility and security of mobile communications are becoming increasingly prominent.At the same time,existing upper-layer security technologies are no longer able to meet the needs of communication networks.With the development of computer computing capabilities,traditional encryption methods that use computational complexity to enhance communication security through public or private key systems face challenges.Moreover,due to the broadcast characteristics of the wireless channel and the rapid development of the interception technology,the eavesdropper can obtain information that cannot be protected by traditional security policies such as the modulation mode and the channel coding type of the legitimate communication parties by using certain means,and then use the information to infer the communication intention,and even Speculate the plaintext information.Therefore,it is a hot research topic to construct a secure transmission mechanism from the physical layer.The physical layer security encryption technology aims to utilize the inherent characteristics of the wireless channel to achieve security protection of the modulated signal and the encoded information at the physical layer.The combination of physical layer security technology and upper layer security technology can protect the communication network in all aspects and greatly improve system security.The paper focuses on the Physical Layer Encryption(PLE)technology in next-generation mobile communications.The main work includes:First,it summarizes the next generation mobile communication,which is the 5G network architecture and key technologies,focuses on large-scale MIMO technology,and then analyzes the security requirements of next-generation mobile communications,including authenticity,confidentiality,integrity and availability.The security vulnerabilities in mobile communication,including security vulnerabilities and attack methods such as physical layer,MAC layer,network layer,transport layer and application layer,are analyzed,and the security threats faced by the next generation mobile communication are analyzed.The existing physical layer security technologies are summarized and analyzed.Then,for the Spatial Modulation(SM)technology in massive MIMO systems,a three-dimensional modulation physical layer secure transmission scheme based on chaotic antenna index is proposed.The scheme combines the transmit antennas of the massive MIMO system,combines the bit sequence three-dimensionally,and then introduces chaotic theory to generate a key set to protect the antenna combination and mapping mode and modulation mode.The scheme makes full use of the randomness,reciprocity and position sensitivity of the wireless channel phase response,and uses this feature to enhance the security of the physical layer signal.Theoretical analysis and simulation results show that the proposed scheme has strong security and reliability,and the spectrum efficiency is greatly improved compared with the traditional SM-MIMO system.Secondly,for the differential Chaos Shift Keying(DCSK)technology in massive MIMO,a differential chaotic keying physical layer secure transmission scheme based on antenna selection is proposed.In this scheme,two of the transmitting antennas are selected as reference antennas,and the remaining antennas are divided into two groups,and DCSK modulation is performed respectively with one of the reference antennas.Theoretical analysis and simulation results show that while ensuring the performance of bit error rate,the proposed scheme can not only improve the confidentiality of the system,but also has obvious advantages in spectrum efficiency.Finally,on the basis of summarizing the research work,the paper points out the areas to be improved,and looks forward to the follow-up research direction of wireless channel physical layer encryption technology.