Opportunistic usage of television white space with respect to the long term evolution-advanced parameters.

Change of transmission from analogue to digital in television (TV) systems has resulted in the formation of considerable spectrum holes in various geographical locations. Cognitive radio (CR) is one of the best structures that can be opportunistically used for optimal exploitation of these spectral sources. In this study, the authors intend to investigate the use of multiple-input multiple-output orthogonal frequency division multiple access-based structure in the TV white spaces bands in the downlink path with respect to long term evolution advanced (LTE-A) parameters. For this purpose, while different spectrum holes in the TV frequency range have been introduced, their limitations in practical applications have fully been discussed. Besides, since the previous power allocation algorithms are not effective enough to be applied in the present scenario, a proper algorithm for maximising the total capacity of the CR system has been introduced. The performance efficiency of the proposed power allocation algorithm has been evaluated and justified through the consideration of the system parameters based on the LTE-A standard. [ABSTRACT FROM AUTHOR]