Subcarrier Pair Selection and Power Allocation in OFDM Relaying System
OFDM中继系统的中继子载波对选择和功率分配

Relayed transmission is an efficient method to improve the power efficiency and system capacity. In this paper, subcarrier pair selection and power allocation in broadband OFDM relaying system is addressed. Firstly, an equivalent channel gain model for subcarrier pairs is developed for amplify-and-forward and decode-and-forward relaying modes, respectively. Based on this, a subcarrier pair selection method is given by applying the Hungarian algorithm. Finally, the overall transmit power is allocated to the selected subcarrier pairs using the water-filling approach. Simulation results show that the proposed algorithm achieves a higher system capacity than both the random subcarrier pair selection and uniform power allocation scheme.