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Covert Communication of STAR-RIS Aided NOMA Networks
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  • Xingwang Li ,
  • Zhifa Tian ,
  • Wenjing He ,
  • Gaojie Chen ,
  • M. Cenk Gursoy ,
  • Shahid Mumtaz ,
  • Arumugam Nallanathan
Xingwang Li
Henan Polytechnic University

Corresponding Author:[email protected]

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Zhifa Tian
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Wenjing He
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Gaojie Chen
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M. Cenk Gursoy
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Shahid Mumtaz
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Arumugam Nallanathan
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Abstract

This paper investigates covert communication in simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted non-orthogonal multiple access (NOMA) systems, assuming for the sake of being more practical that the successive interference cancellation (SIC) is defective. To assess the covertness performance of the considered system, we first derive closed-form expressions for the detection error probability, the optimal detection threshold and the average minimum detection error probability of the warden, as well as the outage probability of the NOMA user pair. Then an optimization problem to maximize the effective covert rate (ECR) is proposed. According to the results of the simulation, it is possible to increase the maximum ECR of the considered system by varying the amount of components of the STAR-RIS.