Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 71, Issue 9, Pages 9490-9500Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2022.3177132
Keywords
Optimization; Array signal processing; NOMA; Uplink; Resource management; Quality of service; Iterative methods; IRS; MIMO; NOMA; resource allocation; uplink
Categories
Funding
- National Key R&D Program of China [2018YFB1801104]
- State Key Laboratory of Rail Transit Engineering Informatization (FSDI) [SKLKZ19-04]
- China Scholarship Council (CSC) Program
- Natural Sciences and Engineering Research Council of Canada
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This paper investigates the application of intelligent reflecting surface (IRS) in an uplink multiple-input multiple-output non-orthogonal multiple access system to enhance energy efficiency. A joint optimization of active beamforming at the base station, passive beamforming at the IRS, and power allocation is proposed, which is solved using an iterative method. A low-complexity user ordering method is also provided. Numerical results demonstrate the convergence of the optimization scheme and the effectiveness of the user ordering.
In future wireless communication systems, intelligent reflecting surface (IRS) plays an important role since it is capable of dynamically reconfiguring the channel conditions. In this paper, we apply IRS to facilitate the communication of an uplink multiple-input multiple-output non-orthogonal multiple access system. The objective is to maximize the system energy-efficiency (EE), requiring a joint optimization of the active beamforming at the base station, passive beamforming at the IRS, and power allocation. An iterative method is proposed to solve the formulated multi-variable non-convex optimization problem. Moreover, a low-complexity user ordering method is provided. Numerical results verify the rapid convergence of the iterative optimization scheme and the effectiveness of the user ordering. In addition, a substantial gain can be obtained by employing the proposed scheme over the benchmark schemes without IRS and with orthogonal multiple access.
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