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OALib Journal期刊
ISSN: 2333-9721
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浅海信道下的时间反转mfsk水声通信
DOI: 10.13232/j.cnki.jnju.2015.06.014, PP. 1189-1194
Keywords: 多径,下变频,虚拟时间反转,多进制数字频率调制
Abstract:
mfsk(multiplefrequencyshiftkeying)水声通信具有实现简单方便、性能稳健等优点,但在浅海信道较为严重的信道多径条件下其性能受到很大影响.虚拟时间反转镜(virtualtimereversalmirror,vtrm)可通过空间时间聚焦有效抑制信道多径,已广泛应用于相干水声通信系统.提出将虚拟时间反转镜引入浅海信道mfsk水声通信中进行多通道时反处理抑制多径,并采用下变频处理有效降低了mfsk系统中时反处理的运算复杂度,同时通过对探针信号进行逐帧更新增强对信道时变的适应能力.浅海信道海试实验结果证实了本文方案的有效性.
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