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Journal of Electrical and Computer Engineering
Volume 2012 (2012), Article ID 909540, 7 pages
Research Article

On the Reusage of Primary Radio Resources through the Exploitation of the Spatiotemporal Robustness of the MIMO Transmissions

Signal Theory and Communications Department, Technical University of Catalonia, Barcelona Tech, Building D4 Campus Nord, Jordi Girona 31, 08034 Barcelona, Spain

Received 8 June 2012; Accepted 14 August 2012

Academic Editor: Ghazanfar Ali Safdar

Copyright © 2012 G. A. Medina-Acosta and José A. Delgado-Penín. 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.


The spatiotemporal robustness of the MIMO transmissions is exploited aiming at inducing opportunistic secondary communications on the primary radio resources. The proposed model makes use of the smallest singular values and the Extreme Value Theory for characterizing the robustness of the MIMO systems, having always the premise of preventing significant degradations in the performance of the primary communications, while at the same time an attractive number of potential opportunities for secondary are intended to be offered. So, the idea behind the suggested scheme consists in reusing the information that is already available within the primary MIMO networks aiming at cotransmitting opportunistically in a clever manner, which at the end will allow us to make a much more efficient use of both the natural and technical resources.