中文摘要：

MFSK（Multiple frequency shift keying）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（Virtual time reversal mirror,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。

英文摘要：

Multiple Frequency Shift Keying（MFSK）underwater acoustic communication has the advantages of simple, convenient and stable performance,but its performance is greatly affected by the channel multipath conditions in the shallow water channel.Virtual time reversal mirror（VTRM）can effectively suppress the channel multipath through space time focusing,which has been widely used in the coherent underwater acoustic communication system.In this paper,we introduced the virtual time reversal mirror in the shallow water channel MFSK underwater acoustic com-munication,and suppressed the multipath in multi channels.And the lower frequency conversion processing effectly reduced the computational complexity of the MFSK-VTRM system,and the adaptation ability of the probe signal was enhanced by the frame update.The sea trial experiment results in the shallow sea channel confirmed the validity of this scheme.