Energy-efficient coordinated beamforming for multi-cell multicast networks under statistical CSI

Juwendo Denis (1, 2, 3) , Sinda Smirani (1, 2, 3) , Bakarime Diomande (1, 2, 3) , Takoua Ghariani (1, 2, 3) , Badii Jouaber (4, 1, 2, 3)

1 TSP - RS2M - Département Réseaux et Services Multimédia Mobiles
2 SAMOVAR - Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux
3 CNRS - Centre National de la Recherche Scientifique
4 R3S-SAMOVAR - Réseaux, Systèmes, Services, Sécurité

In this paper, we investigate the problem of energy-efficiency for physical layer multicasting in multi-cell network under the assumption that only downlink channel distribution information (CDI) is available at the base station. Each BS, equipped with multiple antennas, uses a single beamformer to convey a common information to a group of single antenna users. The problem is formulated as the global energy-efficiency maximization under each active user' outage constraints. To circumvent the high computational complexity incurred by investigating the NP-hard problem, we leverage the concept of successive convex approximation to tackle the original non-convex problem. We provide an analytical solution for the beamformer design that allows solving the original centralized problem in a distributed manner with limited signaling exchanges. Furthermore, extensive simulation analyses are provided to corroborate the validity of the theoretical findings and demonstrate the efficiency of our proposed algorithm

Domaines: Réseaux et télécommunications [cs.NI]

Juwendo Denis, Sinda Smirani, Bakarime Diomande, Takoua Ghariani, Badii Jouaber. Energy-efficient coordinated beamforming for multi-cell multicast networks under statistical CSI. SPAWC 2017 : IEEE 18th International Workshop on Signal Processing Advances in Wireless Communications, Jul 2017, Sapporo, Japan. pp.1 - 5, ⟨10.1109/SPAWC.2017.8227795⟩. ⟨hal-01681414⟩