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中文摘要：
以多跳中继网络中的资源分配为研究对象,提出了一种用于两跳中继系统下行传输的子载波与功率分配算法,目标是在总功率一定的条件下使得系统的吞吐量最大。该算法包括三个步骤：首先分配第二跳链路上的子载波,之后进行子载波配对,最后进行功率分配。在功率分配中基于运算复杂度不同提出了最优化功率分配（OPA）与平均功率分配（EPA）。仿真结果表明,最优化功率分配的性能要优于平均功率分配,并且当第一跳链路与第二跳链路的信道质量相差不多时进行子载波配对可以有效提高系统性能,此外该算法能够获得多用户分集增益。
英文摘要：
Radio resource allocation is a key issue in multihop relay（MR） network.A subcarrier and power allocation algorithm for the downlink of two-hop relay systems was proposed,and the goal is to maximize the system throughput under a joint sum power constraint.The heuristic algorithm is composed of three steps：subcarriers allocation on the second hop,subcarrier pairing and power allocation.In power allocation,optimal power allocation（OPA） and equal power allocation（EPA） were proposed according to different computing complexities.Simulation results show that OPA always outperforms EPA and subcarrier pairing can improve the system performance effectively when the channel qualities of the first hop link and the second hop link are similar,moreover the proposed algorithm can exploit multiuser diversity gain.
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