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A cross-layer power allocation scheme for distributed antenna systems is proposed in this paper. From a cross-layer perspective, system throughput coefficient and fairness coefficient are defined taking into consideration both queue state information in data-link layer and channel state information in physical layer. Particularly, an improved particle swarm based optimization algorithm is proposed to solve the proposed optimization problem. Simulation results show that improved particle swarm optimization algorithm can obtain lower queue delay. System throughput and fairness performance obtained by the proposed algorithm increase considerably compared with those by fixed power allocation algorithm.