Design method of power domain NOMA secure communication system assisted by intelligent reflecting surface

Abstract

The invention provides a design method of a power domain NOMA secure communication system assisted by an intelligent reflecting surface, which comprises two scenes of external eavesdropping and internal eavesdropping, and comprises the following steps of: sending information to legal non-orthogonal users by a base station through the assistance of the intelligent reflecting surface; establishing an intelligent reflector-assisted NOMA secure communication system model, giving a received signal expression and a detection signal-to-noise ratio of a legal user and an eavesdropping user, converting continuous phase shift of a reflection unit into random phase shift by using a 1-bit coding mechanism, performing on-off control on the reflection unit through 1 and 0, maximizing the reception signal-to-interference-and-noise-ratio of the legal user, inhibiting the performance of an eavesdropper, deriving a theoretical expression of the security outage probability of the non-orthogonal user. Compared with an intelligent reflecting surface assisted OMA system, the method has the advantages that the safety outage probability performance is improved, and the good application value is achieved.

Description

technical field [0001] The invention relates to a design method of a power domain NOMA security communication system assisted by an intelligent reflection surface, which belongs to the technical field of wireless communication, and in particular relates to two eavesdropping models (external eavesdropping and internal eavesdropping) and a method for converting the continuous phase shift on the reflection unit 1-bit encoding method for random phase shift. Background technique [0002] With the commercial deployment of the 5G communication system, the multiple access technology of the 6G mobile communication network needs to realize the effective improvement of the total number of access users and the total throughput of the network under the given physical resource conditions from the perspective of the system and the network. The power domain NOMA technology transmits the information of multiple users on the same physical resource by means of the superposition coding mechanis...

AI Technical Summary

Problems solved by technology

In the NOMA network, since the sending end adopts superposition coding and the receiving end uses serial interference erasure decoding, there may be malicious interception and eavesdropping on user information (external eavesdropping) or cause non-orthogonal users to become passive eavesdroppers (internal eavesdropping) tapping)

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