Abstract:

The power allocation strategy based on the game theory for the cognitive radio system is studied. The best utility function for the gametheoretic strategy is analyzed. A distributed power allocation strategy is proposed, where the limit power for each cognitive user is based on its proportional interference to the primary user and satisfying the constraint of the total power interference to the primary user. The comparent performances of the different proportional schemes are investigated. Simulations show that the best power limit for each cognitive user is to produce the same interference to the primary user.

Key words: cognitive radio, game theory, power allocation