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Delay spread estimation in shallow water acoustic channels using masked channel subspaces

机译:浅水声信道中使用掩蔽信道子空间的时延扩展估计

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Tracking the shallow water acoustic channel in real time has been a long standing challenge, particularly over moderate to rough sea conditions due to unpredictable oceanic activity that are difficult to track dynamically using a single algorithm. We build upon prior work to propose a constrained non-convex mixed norm solution that tracks the rapidly fluctuating shallow water acoustic channel as a banded delay spread, wherein different bands correspond to different degrees of multipath reflection and bounce patterns. This enables us to exploit the non-convex solution landscape to track different channel activity independently through the banded constraints, which are implemented as masks on the initialization of the channel tracking algorithm. Promising improvements over the current art in channel prediction error and computing time were observed over experimental field data collected at 200 meters range and 15 meters depth.
机译:实时跟踪浅水声通道一直是一个长期的挑战,特别是在中等到波涛汹涌的海况下,由于不可预测的海洋活动难以使用单个算法动态跟踪。我们在先前工作的基础上提出了一种受约束的非凸混合范数解,该解以带状延迟扩展的形式跟踪迅速波动的浅水声通道,其中不同的频带对应于不同程度的多径反射和反弹模式。这使我们能够利用非凸解决方案格局来通过带状约束独立地跟踪不同的信道活动,这些约束被实现为信道跟踪算法初始化时的掩码。在200米范围和15米深度处收集的实验现场数据中,在信道预测误差和计算时间方面都比现有技术有希望的改进。

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