Publication: Intelligent reflecting surface enhanced millimeter-wave NOMA systems
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Zuo, Jiakuo
Liu, Yuanwei
Dobre, Octavia A.
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Abstract
In this letter, a downlink intelligent reflecting surface (IRS) enhanced millimeter-wave (mmWave) non-orthogonal multiple access (NOMA) system is considered. A joint optimization problem over active beamforming, passive beamforming and power allocation is formulated. Due to the highly coupled variables, the formulated optimization problem is non-convex. To solve this problem, an alternative optimization and successive convex approximation based iterative algorithm is proposed. Numerical results illustrate that: 1) the proposed scheme offers significant sum-rate gains, which confirms the effectiveness of introducing IRS for mmWave-NOMA systems; 2) the proposed algorithm with discrete phase shifts can achieve close performance to that of continuous phase shifts.
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Institute of Electrical and Electronics Engineers (IEEE)
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IEEE Communications Letters
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DOI
10.1109/LCOMM.2020.3009158