Self-interference Characterization for In-Band Full Duplex Underwater Acoustic Communications
Self-interference Characterization for In-Band Full Duplex Underwater Acoustic Communications
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DOI：
10.1145/3366486.3366510
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Zheng Guo;A. Song;Mohammad Towliat;L. Cimini;X. Xia;Chien-Chung Shen
中科院分区：
文献类型：
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作者：
Zheng Guo;A. Song;Mohammad Towliat;L. Cimini;X. Xia;Chien-Chung Shen
带内全双工（IBFD）通信由于其提高频谱效率的潜力而在水声通信领域受到越来越多的关注。自干扰的抑制一直是实现海洋IBFD的主要障碍。有限的工作，在文献中已经做了水下声学的自干扰的特点。在这里，我们分析的自干扰的特性的基础上的现场工作，其中自干扰测量已被收集的多个声波频率范围从20到180 kHz。干扰抵消增益作为数字自干扰抑制的性能指标，随着声载波频率的增加而减小。我们建议使用信道变化率（CVR）来表征信道的可变性。实验结果表明，在较高的声学频率下，CVR较大，高CVR导致自干扰抑制性能下降。还进行了计算机模拟来解释实验观察结果。
In-band full duplex (IBFD) communications attracts increasing attention in the underwater acoustic communication community due to its potential to increase spectral efficiency. The suppression of the self-interference remains the main obstacle to achieve IBFD in the ocean. Limited work in the literature has been done to characterize the self-interference in underwater acoustics. Here we analyze the characteristics of the self-interference based on the fieldwork, where self-interference measurements have been collected for multiple acoustic frequencies ranging from 20 to 180 kHz. The interference cancellation (IC) gain, as the performance metric of the digital self-interference suppression, is found to decrease when the acoustic carrier frequency increases. We propose to use the channel variation ratio (CVR) to characterize channel variability. Experimental results show that the CVR is larger at higher acoustic frequencies and high CVRs lead to the performance degradation in the self-interference suppression. Computer simulations have also been conducted to explain the experimental observations.