中文摘要：

针对水声通信中继系统中系统容量和中继选择问题，本文提出了一种基于中继选择的资源分配算法。首先将每条中继链路的信道增益等效为虚拟直传链路的信道增益，然后在等功率分配的前提下，根据信道信息最佳原则，提出了一种中继选择及资源分配的多用户迭代算法，以实现对每个用户的传输链路进行选择和子载波分配，最后通过线性迭代注水算法进行功率分配。仿真结果表明，所提算法在保证目标速率的前提下，提升了系统容量。

英文摘要：

Focusing on the relay selection and the capacity for underwater acoustic relay communication system, a resource allocation algorithm based on relay selection is proposed in this paper. First, each of the relay-link channel gain is equivalent to virtual direct-link channel gain, then under the equal power allocation assumption, a multi-user iterative algorithm is proposed for relay selection and resource allocation according to the principle of the best channel gain, which can achieve the transmission link selection and subcarrier allocation. Finally, power on each subcarrier is allocated by water-filling algorithm. Simulation results show that the proposed algorithm can increase the system capacity under the constraint of target rate.