Power Control for Cognitive Radios: A Mixed-Strategy Game-Theoretic Framework
Chungang Yang, Jiandong Li · InTech eBooks · 2012
Motivated by the spectrum drought and explosive growth of increasing quality of service requirements, cognitive radio as a promising technique has attracted a significant attention in wireless community.In this chapter, we investigate and summarize the following contents:• After a simple introduction of cognitive radio development in recent years, we focus on the issue of how to implement interference mitigation by power control techniques amongst multiple cognitive radios.An overview of concurrent power control schemes is provided first, then we point out the existing problems and new challenges of power control in cognitive radio networks, which leads us to concentrate on a novel mathematical model-game theory.• Game theory, which captures the dynamic decision-making behavior of selfish and rational players have attracted a wide attention from cognitive radio community, specifically for the game theory-based power control in cognitive radio networks.Several specific game models which suit cognitive radios well are explored and introduced, and these models are with typical good properties, for instance, they can well guarantee the existence and uniqueness of the celebrated Nash equilibrium solution.• There are many impractical assumptions in these existing literature, for example, complete information and rationality and so on.In cognitive radio networks/systems, the complexities of mobility and traffic models, coupled with the dynamic topology and the unpredictability of link quality make these convectional game models meet with limited success.So that we employ mixed-based power control game (MPCG) to deal with the discrete power control issue.MPCG provides a novel point of view to investigate other resource management problems in the uncertain environment including cognitive radio context.• We also discuss several related open problems, such as the lack of proper models for dynamic and incomplete information games.We use the application prospect of game theory to conclude this chapter.We will relax the full nature of the information requirements, and investigate the effective power control from a very creative perspective termed as mix-strategy based matrix power control game (MPCG) model.The typical max-min fairness criteria is chosen as the fair and Power Control for Cognitive Radios: A Mixed-Strategy Game-Theoretic Framework