Abstract
In this paper, the power allocation (PA) for a cognitive radio (CR) system with a distributed antenna system (DAS) is investigated. In the DAS, remote antennas are separated and connected to a central unit (CU) via optical fibre. In this article, the problem of power allocation for CR with DAS is formulated as an optimisation problem. Based on the Karush-Kuhn-Tucker (KTT) conditions for this optimisation problem, a suboptimal PA scheme is developed. The proposed algorithm maximises energy-efficiency (EE) while maintaining proportional fairness. Finally, simulation examples are presented to verify the proposed method. It is shown that the proposed algorithm is effective in power allocation for a CR system with DAS implementation.
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