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OFDM技术可以对抗水声信道中的多径传播并能实现高的频谱效率,空时编码技术则能够获得空间增益并对抗信道衰落。文中在分析OFDM同步误差和空时分组编码原理的基础上,将这两种无线新技术应用于高速水声通信中,设计实现了一个基于MIMO-OFDM技术的高速水声通信系统,并着重讨论了系统同步的实现方法。湖上实验证明了方案的有效性。
OFDM technology can combat multipath propagation in underwater acoustic channels and achieve high spectral efficiency, space-time coding techniques can gain spatial gain and combat channel fading. Based on the analysis of OFDM synchronization error and space-time block coding principle, the two wireless technologies are applied to high-speed underwater acoustic communication. A high-speed underwater acoustic communication system based on MIMO-OFDM is designed and discussed. The realization of the system synchronization. Experiments on the lake proved the effectiveness of the program.