Passive Phase Conjugation is a method for coherent underwater acoustic communication that uses multiple receive-only hydrophones. The technique is essentially a space-time matched filter. Previous results from a field experiment demonstrating the method were reported by Rouseff et al. [IEEE J. Oceanic Eng. 26, pp. 821-831, 2001]. In this paper, performance results are presented for Decision-Directed Passive Phase Conjugation, an adaptive extension to the basic technique. Using decision directed estimates for the channel impulse response, the method requires training overhead of less than 2% for the 10000-symbol packets used in the experiment. Mean-Square-Error and Bit-Error-Rates are reported for various array configurations including a three-element horizontal array.
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机译：被动相位缀合是一种用于相干水下声学通信的方法，其使用多个接收的Hydophers。该技术基本上是空时匹配的滤波器。通过Roseff等人报道了现场实验的先前结果。 [IEEE J. Oceanic Eng。 26，pp。821-831,2001]。在本文中，提出了用于决策被动相位缀合的性能结果，是基本技术的自适应扩展。使用决策指向频道脉冲响应的估计，该方法需要在实验中使用的10000符号分组的训练开销的培训开销。报告了包括三元水平阵列的各种阵列配置的平均误差和比特率速率。
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