Research On The Mechanism Of Power Line Carrier Communication Firewall Based On Physical Layer Security

Powerline carrier communication transmits information over the already existing powerline medium and is widely used in many fields such as smart home and Io T with a series of advantages such as low cost,high yield ratio and wide coverage area.However,the broadcast characteristics of power line channels also provide conditions for attackers to perform interference or eavesdropping,making power line communication face serious communication security issues.Therefore,the design of power line communication system needs to consider the physical layer security to ensure secure transmission.Physical layer security is a communication security technology that uses the basic physical characteristics of the communication channel itself to maximize the performance advantage of the legitimate channel over the illegal eavesdropping channel,which can fundamentally solve the communication security problem of PLC.In this paper,we consider setting up a firewall for the vulnerable power line communication through physical layer security technology,and the main work and innovation points are summarized as follows.(1)Clarify the root role of full-duplex communication in the physical layer security firewall,design an in-band full-duplex self-interference cancellation method applicable to power line carrier communication system,improve the analog domain circuit structure to solve the problem of impedance mismatch between ports,and propose a phase-locking method to synchronize the signal at the receiving end for the signal distortion problem caused by time delay,and finally propose a non-negative adaptive with inequality constraint Finally,a non-negative adaptive algorithm with inequality constraint is proposed to suppress the bad effect of impulse noise on the communication effect and to lay the foundation for the subsequent implementation of other functions of the firewall.(2)A physical layer security scheme for powerline firewall with adaptive band filtering is proposed in the in-band full-duplex communication mode of powerline.Firstly,we analyze the frequency selection characteristics of power line multipath channels,then model the power line channels based on graph theory,design the structural block diagram of the band filtering matching system,set up the band filtering rules,and finally perform adaptive optimization of the weights of the matching algorithm.(3)To address the possible eavesdropping problem when power line communication is applied in the home and other scenarios,we propose a solution of artificial noise assisted firewall physical layer security,establish a model of power line firewall eavesdropping channel injected with artificial noise assistance,derive the secrecy capacity of power line firewall eavesdropping channel with the help of the mathematical properties of the mother function of the momenta,verify the firewall’s security performance on power line communication through theoretical analysis and simulation Theoretical analysis is performed to simulate and verify the improvement of firewall on the security performance of power line communication.