文章摘要
黄远芳,冯海泓,李记龙.FBMC/OQAM水声通信系统的适应性成型脉冲设计[J].声学技术,2019,38(1):32~38
FBMC/OQAM水声通信系统的适应性成型脉冲设计
Adaptive pulse shaping design for FBMC/OQAM system in underwater acoustic communication
投稿时间:2018-01-26  修订日期:2018-03-08
DOI:10.16300/j.cnki.1000-3630.2019.01.005
中文关键词: 水声通信  FBMC/OQAM系统  时变信道  成型脉冲滤波器  扩展高斯函数
英文关键词: underwater acoustic communication  FBMC/OQAM system  time-varying channel  pulse shaping filter  extended Gaussian function
基金项目:国家自然科学基金重点项目(61531018)
作者单位E-mail
黄远芳 中国科学院声学研究所东海研究站, 上海 201815
中国科学院大学, 北京 100049 
 
冯海泓 中国科学院声学研究所东海研究站, 上海 201815 fhh@mail.ioa.ac.cn 
李记龙 中国科学院声学研究所东海研究站, 上海 201815  
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中文摘要:
      水声信道是一个时变的双扩散信道,不仅会引起传输信号的时频扩展,而且会造成严重的信息损失。由于滤波器组多载波/交错正交幅度调制(Filter Bank Based Multicarrier/Offset Quadrature Amplitude Modulation,FBMC/OQAM)系统可通过改变发送信号的成型脉冲来减小时频扩展带来的符号干扰和子载波干扰,因此更适合快速时变的水下声信道。为了降低现有成型脉冲设计算法的优化难度,提出了一种快速且易于实现的成型脉冲设计方法,该方法根据信道时频统计特性对扩展高斯函数(Extend Gaussian Function,EGF)进行了优化,实现了期望信号能量最大化,并在时域符号间加入适当的保护间隔,进一步增强了抗多途干扰的能力。仿真结果表明,无论在高频散信道还是在低频信道下,相比于其它成型脉冲算法,该算法在降低计算量的同时,改进了的FBMC/OQAM系统的传输性能,误码率降低了2~3 dB。
英文摘要:
      Underwater acoustic channel is a time-varying doubly dispersive channel, which will not only cause the time-frequency spread of transmission signal, but also cause serious loss of information. Pulse shaping design of the FBMC/OQAM systems can reduce the inter-symbol interference (ISI) and inter-channel interference (ICI) in time-varying channels, therefore is more suitable for highly time-varying underwater acoustic channel. To avoid the difficulty of optimizing the existing methods, a fast and reliable pulse shaping design method is introduced, which takes advantage of the statistic characteristics of time-varying channels to optimize the Extended Gaussian Function (EGF) for maximizing the energy of the desired signal and adds appropriate protection intervals between symbols to further combat time dispersion. Simulation results show that the performance of the proposed adaptive pulse shaping design method is superior to some other methods, whether in algorithm's speed or in system communication performance, and whether in frequency mildly dispersive channel or in frequency highly dispersive channel. The error rate of FBMC/OQAM systems is reduced by 2~3 dB.
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