改进的被动时间反转阵处理水下通信

时间反转技术由于不受环境制约,能自适应实现信道多途压缩和对指定点的空间聚焦,降低多用户通信过程中的码间干扰和同道干扰,广泛应用在水声通信领域。利用垂直阵加权处理的方法,在被动时间反转的基础上增加了一抵消项,抑制其中一个用户在接收阵的接收幅度以达到对另一用户指定通信的目的。模拟仿真显示该方法比单独只用被动时间反转处理,误码率能降低一半。海上试验数据处理结果与模拟仿真基本一致。

Improved passive time reversal array processing in underwater communication

Irrespective of environmental condition,time reversal approach can self-adaptively compress multi-path and selectively focus on a target,reduce inter-symbol interference（ISI） and co-channel interference（CI） of multi-user com-munications,so it is widely used in underwater acoustic communications.Based on the passive time reversal approach,an offset term is added to vertical receiving array processing,which can restrain one user’s receiving signal amplitude to achieve communication with another pointed one.The computer simulation shows that this method can reduce half of bit error rate（BER） as compared with only using time reversal processing.The sea-trial data analysis is generally con-sistent with the simulation.