An efficient subcarrier arrangement for airborne OFDM communication using parametric loudspeaker
An efficient subcarrier arrangement for airborne OFDM communication using parametric loudspeaker
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DOI：
10.35848/1347-4065/abf3d6
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发表时间：
2021-03
影响因子：
1.5
通讯作者：
Kazuma Tajima;N. Wakatsuki;T. Ebihara;K. Mizutani
中科院分区：
文献类型：
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作者：
Kazuma Tajima;N. Wakatsuki;T. Ebihara;K. Mizutani
空中水声通信作为一种可供选择的近场通信介质，已经引起了人们的广泛关注。参数扬声器具有在个人区域内实现声学通信的潜力。然而，空气中自解调产生的通信信号中的二次非线性分量成为水声通信的障碍。尽管希望使用正交频分多路复用(Ofdm)，但由于其即使在多径衰落环境中也在接收器实现低计算成本均衡，具有二次分量的载波间干扰(ICI)降低了通信质量。在这篇文章中，我们提出了一种有效的子载波安排，用于使用参数扬声器的OFDM通信。我们考虑了两种子载波方案：奇数梳OFDM和窄带OFMD。前者有一个奇数索引的有源子载波，后者有一个有限的频带以避免ICI。我们还在实验中对提出的方案进行了测试。实验结果表明，该方案与原方案相比，通信质量有了较大的提高。
Acoustic communication in air has attracted attention as an alternative near-field communication medium. A parametric loudspeaker has the potential to achieve acoustic communication within a personal area. However, secondary nonlinear components of communication signals generated by self-demodulation in air become barriers to acoustic communication. Although the use of orthogonal frequency division multiplexing (OFDM) would be desirable, since it achieves low-calculation-cost equalization at the receiver even in a multipath fading environment, inter-carrier interference (ICI) with secondary components degrades communication quality. In this paper, we propose an efficient subcarrier arrangement for OFDM communication using parametric loudspeakers. We consider two subcarrier arrangements: odd-comb OFDM and narrow-band OFMD. The former has an active subcarrier at odd indexes, and the latter has a restricted frequency band to avoid ICI. We also test the proposed schemes in experiments. The experimental results suggest that the proposed OFDM successfully improves communication quality compared to the original OFDM.