Performance analysis of covert communication in IRS-assisted NOMA networks
Covert communication is one of the key technologies to ensure the security of wireless communications.To enhance the communication security,covert communication of intelligent reflecting surface(IRS)-assisted non-orthogonal multiple access(NOMA)systems is proposed.Considering the channel estimation errors and imperfect successive interference cancellation(SIC),the exact expressions of the detection error probability(DEP)and the optimal detection threshold of the Willie are derived,and then the average minimum DEP(AMDEP)and outage probabilities(OP)for the two NOMA users are given.Finally,the reliability and covertness of the network are balanced to maximize the effective covert rate(ECR)of the system.Simulation results show that the proposed scheme can achieve covert communication,and there exists an upper bound for the ECR of the system.Furthermore,the non-ideal channel state information(CSI)and imperfect SIC have deleterious influence on the system performance.
covert communicationNOMAIRSeffective covert ratedetection error probability
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