基于正交频分复用的高速水声通信技术  

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

作　　者：朱彤[1] 桑恩方[1] 

机构地区：[1]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2005年第1期71-74,共4页Journal of Harbin Engineering University

摘　　要：信号的多途传输引起的码间干扰是影响高速水声通信的主要障碍之一.为了克服码间干扰,设计了一种改进的基于正交频分复用(OFDM)技术的水声通信方法,直接将发射数据的实部调制到高载频进行传输,结构简单.湖试中,在7 000m距离内,传输速率达到8. 3KB/s,误码率10-2∶10-5.试验证明该方法可以有效降低码间干扰的影响,达到较高的传输速率和较低的误码率.Intersymbol interference (ISI) caused by multipath propagation is one of the main challenges in high speed underwater acoustic communication. In order to overcome ISI, an improved method based on orthogonal frequency division multiplexing (OFDM) is proposed, which directly modulated the real part of the transmitting data on the proper carrier. The structure of the system was simple. When tested in a lake, the bit rate reached 8.3 KB/s within 7000 m with the bit error rate (BER) between 10-2: 10-5. Experiments have shown that by this method the effect of ISI can be reduced and the system can reach high data rates with low BER.

关 键 词：正交频分复用 IFFT/FFT 循环前缀 水声通信 码间干扰 

分 类 号：TB567[交通运输工程—水声工程]