NDLI: Multicast multigroup beamforming for per-antenna power constrained large-scale arrays

Content Provider	IEEE Xplore Digital Library
Author	Christopoulos, D. Chatzinotas, S. Ottersten, B.
Copyright Year	2015
Description	Author affiliation: SnT, Univ. of Luxembourg, Luxembourg, Luxembourg (Christopoulos, D.; Chatzinotas, S.; Ottersten, B.)
Abstract	Large in the number of transmit elements, multi-antenna arrays with per-element limitations are in the focus of the present work. In this context, physical layer multigroup multicasting under per-antenna power constrains, is investigated herein. To address this complex optimization problem low-complexity alternatives to semi-definite relaxation are proposed. The goal is to optimize the per-antenna power constrained transmitter in a maximum fairness sense, which is formulated as a non-convex quadratically constrained quadratic problem. Therefore, the recently developed tool of feasible point pursuit and successive convex approximation is extended to account for practical per-antenna power constraints. Interestingly, the novel iterative method exhibits not only superior performance in terms of approaching the relaxed upper bound but also a significant complexity reduction, as the dimensions of the optimization variables increase. Consequently, multicast multigroup beamforming for large-scale array transmitters with per-antenna dedicated amplifiers is rendered computationally efficient and accurate. A preliminary performance evaluation in large-scale systems for which the semi-definite relaxation constantly yields non rank-1 solutions is presented.
Starting Page	271
Ending Page	275
File Size	378081
Page Count	5
File Format	PDF
e-ISBN	9781479919314
DOI	10.1109/SPAWC.2015.7227042
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-28
Publisher Place	Sweden
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Approximation methods Complexity theory Antenna arrays Multicast communication Transmitting antennas Interference Successive Convex Approximation Large-scale Multicasting
Content Type	Text
Resource Type	Article

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