中文摘要：

水声信道的频带极其有限和多径干扰严重是目前制约水声通信数据率提高的主要瓶颈。正交频分复用（OFDM）技术因具有抗多径干扰和频谱利用率高等特性而被大量通信标准采用。同时，软件无线电技术可简化系统的硬件结构、节省成本且便于升级。结合两种技术的优势，设计了一种基于软件无线电技术的高速水声通信系统。论文详细描述了系统框架、软硬件设计和信号处理流程。最后通过水声实验，验证了该系统具有可靠的传输性能。

英文摘要：

Severely restricted bandwidth and multi-path interference are the main bottleneck for improving the data rate of current underwater acoustic communication systems. The Orthogonal Frequency Division Multiplexing （OFDM） technology is adopted by a large number of communication standards for its ability of resistance to multi-path interference and high spectrum utilization. In addition, software radio technology simplifies the hardware structure of the system, reduces the costs and is easy to upgrade. Considering the advantages of these two technologies, a high-speed underwater acoustic communication system based on software radio technology is designed. The system framework, hardware and software design and signal processing are respectively described in a detailed manner. Finally, the reliable transmission performance of the system is verified through acoustic experiments in lake.