Abstract
A cognitive radio is an intelligent radio that can be programmed and configured dynamically. Its transceiver is designed to use the best wireless channels in its vicinity. Such a radio automatically detects available channels in the wireless spectrum, then accordingly changes its transmission or reception parameters to allow more concurrent wireless communications in a given spectrum band at one location. This process is a form of dynamic spectrum management. In recent years, the development of intelligent, adaptive wireless devices called cognitive radios, together with the introduction of secondary spectrum licensing, has led to a new paradigm in communications: cognitive networks. Cognitive networks are wireless networks that consist of several types of users: often a primary user and secondary users. These cognitive users employ their cognitive abilities to communicate without harming the primary users. The study of cognitive networks is relatively new and many questions are yet to be answered. This chapter furthers the study.
TopNon-Cooperative Spectrum Sharing Games
In this section, we discuss non-cooperative spectrum sharing games such as repeated game, potential game, supermodular game, and so on. In a non-cooperative game with rational network users, each user only cares about his own benefit and chooses the optimal strategy that can maximize his payoff function (Figure 1). Such an outcome of the non-cooperative game is termed as Nash equilibrium, which is the most commonly used solution concept in game theory (Wang, Wu, & Liu, 2010).
Figure 1.
Non-cooperative spectrum sharing game