User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems
In this paper, we study user grouping, precoding design, and power allocation for multiple-input multiple-output (MIMO) nonorthogonal multiple access (NOMA) systems. An optimization problem is formulated to the maximize the sum rate under a transmit power constraint at a base station and rate constr...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Mathematics |
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| Online Access: | https://www.mdpi.com/2227-7390/11/4/995 |
| _version_ | 1797619433858924544 |
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| author | Byungjo Kim Jae-Mo Kang |
| author_facet | Byungjo Kim Jae-Mo Kang |
| author_sort | Byungjo Kim |
| collection | DOAJ |
| description | In this paper, we study user grouping, precoding design, and power allocation for multiple-input multiple-output (MIMO) nonorthogonal multiple access (NOMA) systems. An optimization problem is formulated to the maximize the sum rate under a transmit power constraint at a base station and rate constraints on users, which are nonconvex and combinatorial and thus very challenging to solve. To tackle this problem, we carry out the optimization in two steps. In the first step, exploiting the machine learning technique, we develop an efficient iterative algorithm for user grouping and precoding design. In the second step, we develop a power-allocation scheme in closed form by recasting the original problem into a useful and tractable convex form. The numerical results demonstrate that the proposed joint scheme, including user grouping, precoding design, and power allocation, considerably outperforms the existing schemes in terms of sum rate maximization, which increases the sum-rate up to 8–18%. In addition, the results show the larger the number of antennas or users, the bigger the performance gap, at the cost of less computational complexity. |
| first_indexed | 2024-03-11T08:28:07Z |
| format | Article |
| id | doaj.art-2e6f188c2b6446f191d27ed472c4355b |
| institution | Directory Open Access Journal |
| issn | 2227-7390 |
| language | English |
| last_indexed | 2024-03-11T08:28:07Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Mathematics |
| spelling | doaj.art-2e6f188c2b6446f191d27ed472c4355b2023-11-16T21:56:54ZengMDPI AGMathematics2227-73902023-02-0111499510.3390/math11040995User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA SystemsByungjo Kim0Jae-Mo Kang1Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of KoreaDepartment of Artificial Intelligence, Kyungpook National University, Daegu 41566, Republic of KoreaIn this paper, we study user grouping, precoding design, and power allocation for multiple-input multiple-output (MIMO) nonorthogonal multiple access (NOMA) systems. An optimization problem is formulated to the maximize the sum rate under a transmit power constraint at a base station and rate constraints on users, which are nonconvex and combinatorial and thus very challenging to solve. To tackle this problem, we carry out the optimization in two steps. In the first step, exploiting the machine learning technique, we develop an efficient iterative algorithm for user grouping and precoding design. In the second step, we develop a power-allocation scheme in closed form by recasting the original problem into a useful and tractable convex form. The numerical results demonstrate that the proposed joint scheme, including user grouping, precoding design, and power allocation, considerably outperforms the existing schemes in terms of sum rate maximization, which increases the sum-rate up to 8–18%. In addition, the results show the larger the number of antennas or users, the bigger the performance gap, at the cost of less computational complexity.https://www.mdpi.com/2227-7390/11/4/995MIMOmachine learningNOMApower allocationprecoding designuser clustering |
| spellingShingle | Byungjo Kim Jae-Mo Kang User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems Mathematics MIMO machine learning NOMA power allocation precoding design user clustering |
| title | User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems |
| title_full | User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems |
| title_fullStr | User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems |
| title_full_unstemmed | User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems |
| title_short | User Grouping, Precoding Design, and Power Allocation for MIMO-NOMA Systems |
| title_sort | user grouping precoding design and power allocation for mimo noma systems |
| topic | MIMO machine learning NOMA power allocation precoding design user clustering |
| url | https://www.mdpi.com/2227-7390/11/4/995 |
| work_keys_str_mv | AT byungjokim usergroupingprecodingdesignandpowerallocationformimonomasystems AT jaemokang usergroupingprecodingdesignandpowerallocationformimonomasystems |