文章摘要
韦周芳,黄建国,何成兵.MFSK浅海远程通信多径抑制的频率分组编码方法[J].,2006,25(6):346-351
MFSK浅海远程通信多径抑制的频率分组编码方法
Frequency group coding method to restrain the multipaths in MFSK long-range acoustic communications
  
中文摘要:
      多频移键控调制技术(MFSK)对信道衰落有良好的适应性,是远程水声通信的重要技术。但是,用于浅海远程水声通信时,由于多径传播的影响,导致严重的码间干扰(ISI),使得远程微弱信号的频率估计产生较大偏差,误码率显著增加。本文针对远程水下信道和MFSK调制的特点,提出了一种新的频率分组编码(FGC)方法。该方法改变了传统MFSK的数据帧格式,相邻符号采用不同组的频率进行编码映射,有效抑制了多径干扰。在深入研究新方法统计特性的基础上进行了湖试验证,结果表明,采用FGC新方法的通信系统,多径抑制有效,性能稳健,更适合于80-100km水声远程通信。
英文摘要:
      Multi-frequency shift keying (MFSK) modulation, which is suitable to fading channels, is an important technique in long-range acoustic communications. But in the case of long-range acoustic communications in shallow water it is disturbed by severe multipaths whid produce increased inter-symbol interference (ISI). So the error of frequency estimation for the week signals is bigger and the BER becomes larger. Based on the characters of long rang underwater acoustic channels and MFSK modulation, a new Frequency Group Coding (FGC) method is proposed in this paper. This method is different from the traditional MFSK frame in that its neighboring MFSK symbols are mapped to different frequency group to restrain the severe multipaths effectively. After the statistical characteristics study by simulation in experiments on the new method in a lake were carried out. The results show the effectiveness and robustness of the new method in eliminating the multipath interference in long range shallow water acoustic communication up to the range of 80~100km.
DOI:10.11684/j.issn.1000-310X.2006.06.006
中文关键词: 远程水声通信  MFSK  多径抑制  频率分组编码
英文关键词: Long-range acoustic communications  MFSK  Multipaths restraint  Frequency group coding
基金项目:
作者单位
韦周芳 西北工业大学航海学院 西安 710072 
黄建国 西北工业大学航海学院 西安 710072 
何成兵 西北工业大学航海学院 西安 710072 
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