University of Oulu

G. Venkatraman, A. Toelli, M. Juntti and L. Tran, "Multi-Group Multicast Beamformer Design for MIMO-OFDM Transmission," European Wireless 2016; 22th European Wireless Conference, Oulu, Finland, 2016, pp. 1-6.

Multi-group multicast beamformer design for MIMO-OFDM transmission

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Author: Venkatraman, Ganesh1; Tölli, Antti1; Juntti, Markku1;
Organizations: 1Centre for Wireless Communications (CWC) - Radio Technologies, P.O. Box 4500, University of Oulu, Finland - FI-90014
2Department of Electronic Engineering, Maynooth University, Maynooth, Co Kildare, Ireland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2016
Publish Date: 2018-08-06


We study the problem of designing multicast precoders for multiple groups with the objective of minimizing total transmit power under certain guaranteed quality-of-service (QoS) requirements. To avail both spatial and frequency diversity, we consider a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. The problem of interest is in fact a nonconvex quadratically constrained quadratic program (QCQP) for which the prevailing semidefinite relaxation (SDR) technique is inefficient for at least two reasons. At first, the relaxed problem cannot be equivalently reformulated as a semidefinite programming (SDP). Secondly, even if the relaxed problem is solved, the so-called randomization procedure should be used to generate a high quality feasible solution to the original QCQP. However, such a randomization procedure is difficult in the considered system model. To overcome these shortcomings, we adopt successive convex approximation (SCA) framework in this paper to find beamformers directly. The proposed method not only avoids the randomization procedure mentioned above but also requires lower computational complexity compared to the SDR approach. Numerical experiments are carried out to demonstrate the effectiveness of the proposed algorithm.

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ISBN Print: 978-3-8007-4221-9
Pages: 355 - 360
Host publication: European Wireless 2016 : 22th European Wireless Conference 18-20 May 2016, University of Oulu, Finland
Conference: European Wireless Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work has been supported by the Academy of Finland. This work has been co-funded by the Irish Government nd the European Union under Irelands EU Structural and Investment Funds Programmes 2014-2020 through the SFI Research Centres Programme under Grant 13/RC/2077.
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