Digital Self-Interference Cancellation for Asynchronous In-Band Full-Duplex Underwater Acoustic Communication.

Digital Self-Interference Cancellation for Asynchronous In-Band Full-Duplex Underwater Acoustic Communication.
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异步带内全双工水声通信的数字自干扰消除

DOI:
10.3390/s18061700
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发表时间:
2018-05-24
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Sun Z
Sun Z
中科院分区:
其他
文献类型:
--
作者:
Qiao G;Gan S;Liu S;Ma L;Sun Z

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为了提高水声网络的吞吐量,带内全双工通信是水声网络研究的重要内容之一。IBFD-UWA通信的主要缺点是自干扰(SI)。提出了一种适用于异步IBFD-UWA通信系统的数字SI消除算法。我们关注两个问题:一种是不同于IBFD无线通信的异步通信,另一种是由功率放大器(PA)引起的非线性失真。首先,我们讨论了非线性失真的异步IBFD-UWA信号模型。然后,我们设计了一种异步IBFD-UWA通信方案,利用SI和预期信号之间的非重叠区域来估计非线性SI信道。为了消除PA引起的非线性失真,我们提出了一种基于过参数化的递归最小二乘(RLS)算法(OPRLS)来估计非线性SI信道。此外,我们提出了一个稀疏约束的OPRLS估计SI信道,这降低了非重叠区域的长度的要求。最后,我们通过仿真和水池实验验证了我们的概念。结果表明,所提出的数字SI消除方案可以有效地消除SI。
To improve the throughput of underwater acoustic (UWA) networking, the In-band full-duplex (IBFD) communication is one of the most vital pieces of research. The major drawback of IBFD-UWA communication is Self-Interference (SI). This paper presents a digital SI cancellation algorithm for asynchronous IBFD-UWA communication system. We focus on two issues: one is asynchronous communication dissimilar to IBFD radio communication, the other is nonlinear distortion caused by power amplifier (PA). First, we discuss asynchronous IBFD-UWA signal model with the nonlinear distortion of PA. Then, we design a scheme for asynchronous IBFD-UWA communication utilizing the non-overlapping region between SI and intended signal to estimate the nonlinear SI channel. To cancel the nonlinear distortion caused by PA, we propose an Over-Parameterization based Recursive Least Squares (RLS) algorithm (OPRLS) to estimate the nonlinear SI channel. Furthermore, we present the OPRLS with a sparse constraint to estimate the SI channel, which reduces the requirement of the length of the non-overlapping region. Finally, we verify our concept through simulation and the pool experiment. Results demonstrate that the proposed digital SI cancellation scheme can cancel SI efficiently.
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