Joint User Grouping and Power Optimization for Secure mmWave-NOMA Systems

Yang Cao, Shuai Wang, Minglu Jin, Nan Zhao, Yunfei Chen, Zhiguo Ding, Xianbin Wang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Due to the proliferation of mobile devices, provisioning of massive connectivity has become a major challenge for future networks. The combination of millimeter wave (mmWave) with non-orthogonal multiple access (NOMA) provides a promising solution to massive connectivity. However, the security issue therein cannot be ignored due to the openness of wireless channels. To overcome the security challenge in mmWave-NOMA based networks, the nonorthogonal interference can be exploited to improve the security. In this paper, we propose a novel mmWave-NOMA framework where the users are classified as secure users (SUs) and common users (CUs), to satisfy their heterogeneous security service needs with the presence of randomly located eavesdroppers. According to their channel disparity, the NOMA users with stronger channel gains are deemed as SUs for better secrecy performance, while the remaining ones are served as CUs. To further enhance the security, hybrid precoding for SUs is designed to strengthen the desired signal and reduce interference. In addition, to reduce the complexity and satisfy the diverse demands, user grouping and power allocation are jointly optimized to maximize the sum rate of CUs subject to the SUs' requirements. To solve the intractable non-convex problem, we decompose it into two subproblems, i.e., user grouping and power optimization, and a hybrid SU-CU grouping algorithm and a successive convex approximation based algorithm are proposed to solve them, respectively. Finally, simulation results are provided to show the advantages of the proposed scheme.

Original languageBritish English
Pages (from-to)3307-3320
Number of pages14
JournalIEEE Transactions on Wireless Communications
Volume21
Issue number5
DOIs
StatePublished - 1 May 2022

Keywords

  • mmWave communications
  • Non-orthogonal multiple access
  • Power optimization
  • Secrecy transmission
  • User grouping

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