中文摘要：

水声通信系统中多径扩展对水声信号传输有不利影响，而传统自适应均衡器不能实时补偿信道时变多径效应，因此利用时间反转技术的空时聚焦性，将时间反转技术与T／2分数间隔判决反馈均衡器相联合，构建了基于时间反转的水声信道判决反馈算法。仿真实验说明该算法可抑制码间干扰，降低误码率，验证了新算法的正确性和有效性。

英文摘要：

The multipath expansion of underwater acoustic communication system has impacts on water acoustic signal transmission and of traditional adaptive equalizer can not compensate the multipath effect for the channel in real time. The time reversal focusing technology of space-time is used, combining time reversal with T/2 fractional- ly-spaced decision-feedback equalizer, to construct the underwater acoustic channel decision feedback algorithm based on time reversal. The simulation results show that which verity the new algorithm, it can reach inter symbol interference suppression, and reduce the error rate purposes, colidity and correctness.