Evaluation of Intra-Subband Power Allocation for a Downlink Non-Orthogonal Multiple Access (NOMA) System

Zeina Eddo (1) , Marie Rita Hojeij (2, 3, 1) , Charbel Abdel Nour (2, 3) , Joumana Farah (4) , Catherine Douillard (2, 3)

1 USEK - Université Saint-Esprit de Kaslik
2 Lab-STICC_TB_CACS_IAS
3 ELEC - Département Electronique
4 ULFG2 - Faculté de Génie en électricité et électronique, Branche 2 (Université Libanaise)

Non-Orthogonal Multiple Access (NOMA) schemes superpose multiple users in the power domain. It is commonly assumed that the achieved throughput in a downlink NOMA system increases with the channel gain difference between paired users. This paper investigates the accuracy of this claim when different intra-subband power allocation techniques are studied. Moreover, the Proportional Fairness (PF) scheduler is used as a resource allocation mechanism to highlight the importance of the choice of user pairing and of the intra-subband power allocation scheme. Results show that the achieved throughput does not always evolve in the same direction as the channel gain difference between paired users, owing to the choice of the intra-subband power allocation technique. In addition, it was found that the PF scheduler is not fully adapted to NOMA.

Mots clés: NOMA; Proportional Fairness; Intra-subband power allocation; Resource allocation

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

Zeina Eddo, Marie Rita Hojeij, Charbel Abdel Nour, Joumana Farah, Catherine Douillard. Evaluation of Intra-Subband Power Allocation for a Downlink Non-Orthogonal Multiple Access (NOMA) System. GLOBECOM 2016 : IEEE Global Communications Conference: 2nd International Workshop on 5G RAN Design, Dec 2016, Washington, United States. ⟨10.1109/GLOCOMW.2016.7848899⟩. ⟨hal-01439883⟩