Joint Optimization of Subchannel Reassignment and Power Adaptation for Multicarrier Cooperative Systems

An amplify-and-forward multicarrier cooperative system is proposed in this paper. The optimal resource-allocation problem has been investigated in terms of improving data rate. An effective resource-allocation algorithm is proposed based on three techniques, adaptive modulation, subchannel reassignment design and transmit power adaptation. The designed subchannel reassignment not only increases the average data rate, but also raises the threshold of "water-filling" in optimizing power allocation that can further increase data rate. Since the power allocation is based on the designed subchannel reassignment, the complexity of the proposed algorithm is least. Simulation results show that the proposed algorithm effectively increases the system's average data rate.