一种水下通信自适应接收机的降噪性能

J. Catipovic, M. Johnson, D. Adams
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引用次数: 15

摘要

自主水下航行器(auv)的声学通信由于其自身噪声而变得复杂,特别是在带有机载主动声学系统的auv上。幸运的是,AUV上产生的主动排放提供了表征自噪声的方便参考信号。本文讨论了使用这些参考信号来提高声学通信系统的性能。为此,从理论上和实验上对两种降噪方法进行了研究。第一种称为级联方法,利用传统的自适应噪声消除算法,然后是具有自适应均衡的接收器。第二种方法称为噪声消除方法,涉及最近提出的多通道自适应接收机算法。结果表明,多通道接收机可以在-3 dB或更低的信噪比下可靠地工作,对于所使用的编码和数据速率,比传统接收机增益约10 dB。然而,由于自适应噪声的存在,级联方法的性能不如多通道接收方法。
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Noise cancelling performance of an adaptive receiver for underwater communications
Acoustic communication with autonomous underwater vehicles (AUVs) is complicated by the vehicles self-noise, particularly on AUVs with on-board active acoustic systems. Fortunately, active emissions generated on-board the AUV provide a convenient reference signal characterizing the self-noise. This paper addresses the use of such reference signals to improve the performance of acoustic communication systems. To this end, two methods of noise cancellation are examined both theoretically and experimentally. The first, called the cascade method, makes use of a conventional adaptive noise cancellation algorithm followed by a receiver with adaptive equalization. The second, called the noise cancellation method, involves a recently-proposed multi-channel adaptive receiver algorithm. It is shown that the multi-channel receiver can operate reliably in a signal-to-noise ratio of -3 dB or worse, a gain of about 10 dB over a conventional receiver for the codes and data-rates used. The cascade method, however, has a performance inferior to that of the multi-channel receiver due to adaptation noise.
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