Waterfilling-based Resource Allocation Techniques in Downlink Non-Orthogonal Multiple Access (NOMA) with Single-User MIMO

Marie-Josépha Youssef (1, 2, 3) , Joumana Farah (4) , Charbel Abdel Nour (3, 2) , Catherine Douillard (3, 2)

1 Virginia Polytechnic Institute and State University [Blacksburg]
2 IMT Atlantique - ELEC - Département Electronique
3 Lab-STICC_IMTA_CACS_IAS
4 ULFG2 - Faculté de Génie en électricité et électronique, Branche 2 (Université Libanaise)

Non-Orthogonal Multiple Access (NOMA) has proven itself as a serious candidate for multiple access schemes in the 5th generation of wireless communication systems. In this paper, we propose new resource allocation techniques that allow the coupling of NOMA with multiple-input-multiple-output (MIMO) systems. As in most of downlink NOMA systems, the proportional fairness (PF) scheduler is used. As for power allocation (PA), most previous works assume an equal PA between antennas and subbands, which is sub-optimal. In this paper, we first propose a technique to reduce the complexity of the PF scheduler, and then we introduce an iterative waterfilling-based power allocation to the Single-User MIMO (SU-MIMO) case. Extensive simulations show that the novel PA technique improves the quality of experience of users suffering from bad channel conditions, as well as the user fairness.

Mots clés: Downlink transmission; MIMO; Index Terms-downlink transmission; non-orthogonal multiple access; power allocation; scheduling; waterfilling

Domaines: Théorie de l'information [cs.IT]; Electronique; Traitement du signal et de l'image [eess.SP]

Marie-Josépha Youssef, Joumana Farah, Charbel Abdel Nour, Catherine Douillard. Waterfilling-based Resource Allocation Techniques in Downlink Non-Orthogonal Multiple Access (NOMA) with Single-User MIMO. ISCC 2017 : The 22nd IEEE Symposium on Computers and Communications, Jul 2017, Crete, Greece. pp.499 - 506, ⟨10.1109/ISCC.2017.8024578⟩. ⟨hal-01617336⟩