Dynamic resource allocation method for enhancing NOMA visible light communication network security

Abstract

The invention discloses a dynamic resource allocation method for enhancing NOMA visible light communication network security, and the method comprises the steps: obtaining the CSI of a legal mobile user and an eavesdropper through channel estimation, and carrying out the channel gain sorting; obtaining a receiving signal to interference plus noise ratio of the legal mobile user and an instantaneous signal to interference plus noise ratio of an Eve eavesdropping the user by using a serial interference elimination technology of NOMA, and representing the network and security capacity of the NOMAvisible light communication network; proposing a joint optimization problem of security communication and power allocation under the condition of user movement, and maximizing the network and security capacity under the constraint condition that the power of each optical access point and the power allocated to the associated user by the optical access point based on NOMA; and solving the joint optimization problem by using a hierarchical power allocation algorithm. According to the method, a theoretical basis is supplied for enhancing the physical layer security of NOMA visible light communication of mobile users, and the method promotes the application of NOMA visible light security communication in densely populated places, and promotes the practical process of NOMA visible light security communication in the fields of karst cave tourism, ubiquitous wireless access services and the like.

Description

technical field [0001] The invention relates to the technical fields of optical wireless communication and mobile communication, in particular to a dynamic resource allocation method for enhancing the security of NOMA visible light communication network. Background technique [0002] With the unprecedented development of the Internet of Things and the advent of the cyber-physical system (Industry 4.0) era, it is increasingly difficult for the spectrum resources of radio frequency wireless communication to meet the data transmission requirements of large-scale interconnection, high speed, and low latency. In order to break through this bottleneck, researchers and the industry consider developing and utilizing new frequency bands and improving the utilization rate of existing spectrum resources. Visible light communication uses the currently unplanned 400-790THz frequency band for data transmission, which can alleviate the increasingly fierce "spectrum crisis" to a certain ext...

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Problems solved by technology

[0006] It can be seen that up to now, the physical layer security of NOMA visible light communication is mainly aimed at the secure communication of stationary users, while the research on secure communication of mobile users is less

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