Distributed Uplink Power Control Algorithm for Multi-cell OFDM Systems

The power allocation problem in multi-cell OFDM systems is studied in order to coordinate the co-channel interference(CCI) and improve the users performance in cell edge.Based on the non-cooperative game,a payoff function is defined,which would provide a minimum signal interference ratio(SIR) for each user and consider the CCI from other cells.A multi-cell distributed uplink power control algorithm(MDUPC) is derived by maximizing the payoff value.The MDUPC only needs the local information to coordinate inter-cell interference and achieves the best tradeoff between the fairness of users and the spectral efficiency.In the simulation,the parameter selection of the MDUPC is discussed,and the convergence of this algorithm is verified.Compared with the equal power allocation scheme,the simulation results show that the proposed algorithm improves the fairness by 1.7 times with a deceasing 17% throughput.