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International Journal of Digital Multimedia Broadcasting
Volume 2012, Article ID 585267, 11 pages
http://dx.doi.org/10.1155/2012/585267
Research Article

A Low-Complexity Resource Allocation Algorithm for MIMO-OFDMA Multicast Systems with Spectrum-Guarantee Provisioning

Wireless Telecommunications Laboratory (WTL), Department of Electrical and Computer Engineering, University of Patras, 26500 Rio, Greece

Received 24 July 2011; Revised 4 November 2011; Accepted 27 November 2011

Academic Editor: Floriano De Rango

Copyright © 2012 Ioannis G. Fraimis and Stavros A. Kotsopoulos. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We study the important problem of resource allocation for the downlink of Multiple-Input Multiple output (MIMO) Multicast Wireless Systems operating over frequency-selective channels and we propose a low-complexity but efficient resource allocation algorithm for MIMO-enabled OFDMA systems. The proposed solution guarantees a minimum spectrum share for each user while also takes advantage of the multicast transmission mode. The presence of multiple antennas in both transmitter and receiver offers spatial diversity to the system along with the frequency diversity added by the OFDMA access scheme. The computational complexity is reduced from exponential to linear and validation of the proposed solution is achieved through various simulation scenarios in comparison with other multicast and unicast reference schemes used in MIMO-OFDMA systems. Numerical results and complexity analysis demonstrate the feasibility of the proposed algorithm.