RIS-assisted cognitive radio wireless safety communication transmission method using part of CSI (Channel State Information)

Abstract

The invention provides an RIS-assisted cognitive radio wireless safety communication transmission method using part of CSI (Channel State Information), which is used for enabling a secondary transmitter and a secondary user to communicate with a main transmitter and a main user in the same frequency band in an RIS-assisted large-scale MIMO cognitive radio wireless safety communication system. Ensuring that the interference of the secondary transmitter on the primary user is within a certain threshold value, setting an initial value of an RIS reflection coefficient matrix, and designing a beam forming matrix by using part of CSI; designing an RIS reflection coefficient matrix by using the partial CSI according to the beam forming matrix; and repeating the operation until the system security rate converges. According to the method, the spectrum efficiency can be effectively improved on the premise that part of CSI is known, the problem of spectrum scarcity is relieved in an actual communication scene, and the safety rate of a system is improved.

Description

technical field [0001] The invention belongs to the field of the Internet of Things (IoT), in particular to a reconfigurable intelligent reflective surface (Reconfigurable Intelligent Surface, RIS) assisted cognitive radio utilizing partial channel state information (Channel State Information, CSI) of legal users Secure communication transport method. Background technique [0002] At present, IoT has been gradually applied in various fields, such as: industry, agriculture, medicine, etc., billions of IoT devices are distributed in various places, so many IoT users, a large amount of valuable data and IoT devices with limited energy, give the current Communication networks present enormous challenges. On the one hand, due to the broadcast nature of the wireless medium, IoT networks are easily eavesdropped, and physical layer security has become a very valuable technique to ensure secure communication, as RIS has shown in improving IoT secure communication performance by cont...

AI Technical Summary

Problems solved by technology

[0002] At present, IoT has been gradually applied in various fields, such as: industry, agriculture, medicine, etc., billions of IoT devices are distributed in various places, so many IoT users, a large amount of valuable data and IoT devices with limited energy, give the current Communication networks present enormous challenges

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