Abstract
A game-theoretic framework was used to study the effect of modulation on the energy efficiency of cognitive CDMA (Code Division Multiple Access) communications for adaptive modulation. We designed an adaptive utility function which can link modulation, rate and power control. Since users are selfish and rational, a non-cooperative game was proposed, in which each user chose transmit power, transmit symbol rate as well as the modulation in order to maximize its own utility. Compared with a similar approach, our proposed algorithm can improve performance significantly.
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