Zhang, Y;
Zhu, Y;
Wang, D;
Xia, W;
Lu, W;
Tan, B;
(2025)
A Comparison Between RSMA, NOMA, and SDMA in Cell-Free Massive MIMO Systems: From Secrecy Perspective.
IEEE Transactions on Communications
10.1109/TCOMM.2025.3610223.
(In press).
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Abstract
This paper investigates secure transmission in the uplink of a cell-free massive multiple-input multiple-output (MIMO) system employing three distinct multiple access strategies: rate-splitting multiple access (RSMA), non-orthogonal multiple access (NOMA), and space-division multiple access (SDMA). RSMA, functioning as a unifying paradigm, merges the merits of both NOMA and SDMA, and holds substantial promise for enhancing system secrecy. We derive closed-form expressions for secrecy spectral efficiency (SE) under Rician fading channels and imperfect channel knowledge assumptions. The secrecy SE is subsequently evaluated across a range of system configurations, encompassing varying access point (AP) and user numbers, AP and eavesdropper antenna dimensions, line-of-sight probabilities, successive interference cancellation conditions, and multiple access protocols. Harnessing these expressions, we establish an optimization framework for the users’ power control coefficients and APs’ receiving weights to maximize the sum secrecy SE while ensuring quality-of-service secrecy requirements for users. Additionally, an alternative optimization algorithm is proposed to ascertain a high-quality solution. Comprehensive simulations substantiate our theoretical propositions and evaluate the efficacy of the proposed sum secrecy SE maximization algorithm.
| Type: | Article |
|---|---|
| Title: | A Comparison Between RSMA, NOMA, and SDMA in Cell-Free Massive MIMO Systems: From Secrecy Perspective |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TCOMM.2025.3610223 |
| Publisher version: | https://doi.org/10.1109/tcomm.2025.3610223 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Cell-free massive multiple-input multiple-output (MIMO), rate-splitting multiple access (RSMA), secrecy spectral efficiency optimization, performance analysis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10215176 |
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