Abstract

In this paper the problem that how to improve the users' performance at downlink in OFDMA system and adjust the femtocell transmit power based on game theory to achieve the target of improving the femtocell users' throughput and satisfying the macro cell user's interference limit requirement is discussed. We propose a new utility function based on game theory with introducing the factor about the macro cell use's interference limit. The new utility function represents not only the performance of the femtocell user but also the macro cell user's performance. It is found that the new power control algorithm is better by simulation.

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