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Semiorthogonal User Scheduling for Millimeter Wave Using Low-Resolution ADCs

Hung Pham 1, Bac Dang Hoai 2, Quy Vu Khanh 3, and Ban Nguyen Tien 2
1. Faculty of Information Technology, National Academy of Education Management (NAEM), Hanoi, Vietnam
2. Posts and Telecommunications Institute of Technology (PTIT), Hanoi, Vietnam
3. Faculty of Information Technology, Hung Yen University Technology and Education (UTEHY), Hungyen, Vietnam

Abstract—Low-resolution Analogue-to-Digital Converters (ADCs) is a promising solution to reduce power consumption for millimeter wave (mmWave) systems in which the number of antennas at base stations is very large. In this paper, we develop downlink user scheduling for mmWave systems using low-resolution ADCs. Although the sum-rate of Maximum Rate algorithm is very impressive in mmWave systems, it is difficult to use in practice, especially for a large number of users due to exhaustive search. Therefore, we proposed a novel scheduling, termed as NOUS, which selects users who are semi-orthogonal to each other in the beamspace. A closed-form expression for the scheduling criteria in the downlink channel over a mmWave system with low-resolution ADCs and Zero-forcing precoder is derived. The numerical results show that the NOUS algorithm almost achieves the performance of Maximum Rate with lower complexity and outperforms the performance of Proportional Fair in terms of the sum rate.
Index Terms—mmWave MIMO, downlink semi-orthogonal scheduling, low-resolution ADCs

Cite: Hung Pham, Bac Dang Hoai, Quy Vu Khanh, and Ban Nguyen Tien, "Semiorthogonal User Scheduling for Millimeter Wave Using Low-Resolution ADCs," Journal of Communications vol. 16, no. 1, 30-35, January 2021. Doi: 10.12720/jcm.16.1.30-35

Copyright © 2021 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.