Max-Min Fair Precoder Design and Power Allocation for MU-MIMO NOMA

Yalcin, Ahmet Zahid
Cetin, Mustafa Kagan
Yüksel Turgut, Ayşe Melda
In this correspondence, transmit precoders and their power allocation coefficients are designed jointly for a downlink non-orthogonal multiple access (NOMA) wireless communication system. The objective is to provide max-min fairness (MMF) among the strongest users in each group, while maintaining minimum target rates for all the other users. The proposed solutions are respectively based on semi-definite relaxation (SDR) and successive convex approximation (SCA) and on the minimum mean square error (MMSE) approaches. For the latter approach, a simplification is also suggested to lower complexity. It is shown that while rate-splitting (RS) has the best MMF rates, the low-complexity MMSE approach has the least complexity. Moreover, the SDR/SCA approach offers an excellent tradeoff between the two.


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In this paper, hierarchical modulation is used in conjunction with maximum-weight scheduling to achieve lower transmission delays. Via hierarchical modulation, the scheduled user has the option to transmit to two users simultaneously. In order to reflect service differentiation schemes used in upper layers, a scenario in which each user generates packets with different priority levels is considered. It is assumed that as long as there are high priority packets waiting in the scheduled user's queue, lower pr...
Citation Formats
A. Z. Yalcin, M. K. Cetin, and A. M. Yüksel Turgut, “Max-Min Fair Precoder Design and Power Allocation for MU-MIMO NOMA,” IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, vol. 70, no. 6, pp. 6217–6221, 2021, Accessed: 00, 2022. [Online]. Available: