摘要
研究了一种基于多进制频移键控(MFSK)调制的水声远程信息传输技术,给出了通过谱分析进行频域解调的方法.即对于单个码元周期内的接收信号,计算其四阶累积量对角切片的傅立叶谱,将谱峰处的频率值作为载频的估计,根据载频与传输信息的对应关系进行解调.初步的海上试验结果表明,该技术可以实现80km距离、4bit/s数据率的信息可靠传输.
A kind of long-range underwater acoustic information transmission technique based on M-ary Frequency Shift Keying (MFSK) modulation is studied, and the demodulation method based on spectrum estimation is proposed. For each received symbol, we calculate the Fourier spectrum of its fourth-order cumulant's diagonal slices. Then we take the location of the spectrum peak as carrier frequency and conduct demodulation according to the relationship between carrier frequency and transmitted information. The ocean experiment results indicate that transmission of 4 bit/s over 80 km distance was achieved.
出处
《应用基础与工程科学学报》
EI
CSCD
2004年第4期370-375,共6页
Journal of Basic Science and Engineering
