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Multi-group multicast beamformer design for MIMO-OFDM transmission
Date Issued
2016-05-20
Date Available
2021-05-20T12:05:09Z
Abstract
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.
Other Sponsorship
Academy of Finland
Type of Material
Conference Publication
Publisher
VDE Verlag
Copyright (Published Version)
2016 VDE Verlag
Language
English
Status of Item
Peer reviewed
Part of
European Wireless 2016; 22th European Wireless Conference: 18-20 May 2016
Conference Details
The 22nd European Wireless Conference, Oulu, Finland, 18-20 May 2016
ISBN
9783800742219
This item is made available under a Creative Commons License
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