Two-Stage Self-Interference Cancellation for Full-Duplex Underwater Acoustic Systems

Lu Shen, B. Henson, Y. Zakharov, P. Mitchell
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引用次数: 8

Abstract

Underwater acoustic (UWA) communication suffers from the limited available bandwidth of acoustic links. We consider in-band full-duplex (FD) communication in UWA channels, which has the potential of doubling the channel capacity. The key challenge of FD operation is the strong self-interference (SI) introduced by the near-end transmission. For a time-invariant UWA channel, the SI can be efficiently cancelled using an adaptive filter. In practice, the time-varying reflections particularly introduced by the moving sea surface limit the cancellation performance. In this paper, we propose a two-stage SI cancellation scheme with a transceiver structure comprising one projector and two hydrophones. In the first stage, the stable SI path from each hydrophone is cancelled using a digital canceller based on the recursive least-squares (RLS) algorithm with dichotomous coordinate descent (DCD) iterations. In the second stage, the scheme tries to cancel the residual SI using an RLS-DCD-based adaptive beamformer. The beamformer combines the residual signals at the hydrophones in such a way to minimize the final residual SI. The cancellation performance of the proposed scheme is investigated using the Waymark simulator and with lake experiments. As demonstrated by the simulation results, the SI can be efficiently cancelled with the proposed two-stage SI cancellation scheme. The experimental results also demonstrate the capability of the adaptive beamformer in reducing the residual SI after digital cancellation.
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全双工水声系统的两级自干扰消除
水声通信受到水声链路可用带宽有限的限制。我们考虑了UWA信道中带内全双工(FD)通信,它具有使信道容量翻倍的潜力。FD操作的主要挑战是近端传输带来的强自干扰(SI)。对于时不变UWA信道,可以使用自适应滤波器有效地抵消SI。在实际应用中,时变反射特别是海面移动引起的时变反射限制了对消性能。在本文中,我们提出了一个由一个投影仪和两个水听器组成的收发器结构的两阶段SI抵消方案。在第一阶段,使用基于递归最小二乘(RLS)算法和二分类坐标下降(DCD)迭代的数字消去器对每个水听器的稳定SI路径进行消去。在第二阶段,该方案尝试使用基于rls - dcd的自适应波束形成器来消除残余SI。波束形成器以这样一种方式将水听器处的残余信号组合在一起,以最小化最终的残余SI。利用Waymark模拟器和湖泊实验对该方案的消去性能进行了研究。仿真结果表明,所提出的两阶段干扰抵消方案能够有效地消除干扰。实验结果还证明了自适应波束形成器在减少数字对消后的残余SI方面的能力。
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