Multiuser downlink hybrid analog-digital beamforming with individual SINR constraints
Document typeConference report
Rights accessRestricted access - publisher's policy
European Commisision's projectSANSA - Shared Access Terrestrial-Satellite Backhaul Network enabled by Smart Antennas (EC-H2020-645047)
This paper deals with the problem of multiuser transmit hybrid analog-digital beamforming. Precisely, we tackle the problem of transmit power minimization under minimum signal-to-noise-plus-interference ratio (SINR) constraints. While the all-digital beamforming solution has been extensively studied in the recent years, little is known about the hybrid analog-digital optimization. This latter design is known to be a non-convex NP-hard problem as the analog part entails the optimization of a quadratically constraint quadratic program with several equality constraints. In order to solve this problem, we propose an alternating optimization with a successive convex approximation procedure. The conceived scheme is able to consider an arbitrary sub-array connectivity matrix (i.e. localized, interleaved, fully-connected,...). Through numerical simulations it is observed that the proposed framework yields to an efficient solution in few iterations providing a substantial gain compared to current heuristic approaches.
CitationVazquez, M., Blanco, L., Perez, A. Multiuser downlink hybrid analog-digital beamforming with individual SINR constraints. A: International ITG Workshop on Smart Antennas. "WSA 2017: 21th International ITG Workshop on Smart Antennas: March 15-17, 2017; Berlin, Germany". Berlin: VDE-Verlag, 2011, p. 84-89.