高速水声通信中正交频分复用技术试验研究

Research on orthogonal frequency division multiplexing for high speed underwater acoustic communication

设计了基于正交频分复用的高速水声通信系统,并进行了湖上和海上试验研究。湖试中,在6 000 m距离下,传输速率达到7.6 kbps,误码率低于10-4;海试中,在12 km距离下,传输速率达到8.3 kbps,误码率低于10-3。试验结果表明,正交频分复用技术可以较好地克服码间干扰,有效地利用水声信道带宽,达到高速水声通信的目的。

A high-speed underwater acoustic communication system is designed. It was tested in a lake and in a sea respectively. In the lake, the bite rote reached 7.6 kbps within 6 km with the bit error rate （BER） lower than 10^-4; in the sea, the bite rate reached 8.3 kbps within 12 km with the BER lower than 10^-3. The experiments have shown that Orthogonal Frequency Division Multiplexing （OFDM） systems can effectively overcome the ISI （Inter-Symbol Interference） and improve the spectrum utilization to achieve high-speed underwater acoustic commu- nication,