Power Control in Multiuser Mulicarrier Wireless Data Networks
A game-theoretic model is presented to study the management of transmission power in a wireless data network. The authors propose a power game for a multiuser multicarrier setting where all the users are assumed to transmit at equal rate. At equilibrium, each user is shown to transmit over a single carrier. They derive the necessary conditions on the path gains when the Nash equilibrium point exists. They further prove the existence of the Nash equilibrium point using the concept of locally gross direction preserving map. A greedy algorithm is proposed and its correctness is established, where each user acts selfishly to achieve the Nash equilibrium point.