Interference-Dependent Opportunistic Power Control for Multicarrier Interference Channels

We propose an interference-dependent and distributed algorithm for opportunistic power control (OPC) in interference channels for delay-tolerant data services with a view to maximizing each user´s data rate while satisfying a given constraint on the total transmit power of all users. In doing so, we utilize a game-theoretic framework, in which the allocated power to each user on each subchannel depends on the subchannel´s interference. In our scheme, each user´s transmit power depends on transmit power levels of other users, which means that the game belongs to the so-called generalized Nash equilibrium (GNE) problems, which, in general, are hard to analyze. Nevertheless, we will show that the proposed game has at least one GNE and derive sufficient conditions for its uniqueness. Moreover, we derive sufficient conditions for the algorithm´s convergence. Simulations confirm that our proposed scheme yields higher throughput for each user and/or has significantly improved energy efficiency.