BatComm: enabling inaudible acoustic communication with high-throughput for mobile devices
BatComm: enabling inaudible acoustic communication with high-throughput for mobile devices
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DOI：
10.1145/3384419.3430773
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Yang Bai;Jian Liu;Li Lu;Yilin Yang;Yingying Chen;Jiadi Yu
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文献类型：
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作者：
Yang Bai;Jian Liu;Li Lu;Yilin Yang;Yingying Chen;Jiadi Yu
声音通信是移动设备现有短距离无线通信技术（例如 NFC 和 QR 码）的日益流行的替代方案。与当前标准不同，它不需要额外的硬件、照明条件或互联网连接。然而，现有研究的可听性和有限的吞吐量阻碍了它们在广泛应用中的部署。在本文中，我们的目标是重新设计声学通信机制，以在保持听不见的同时突破潜在吞吐量的边界。具体来说，我们提出了 BatComm，一种用于移动设备的高吞吐量、听不见的声学通信系统，其吞吐率比当代最先进的移动设备声学通信高 12 倍。我们从理论上对麦克风的非线性进行建模，并使用正交频分复用 (OFDM) 通过超声波频率载波在多个正交通道上传输数据位。我们还设计了一系列技术来减轻信号不平衡频率响应、环境噪声以及通过 OFDM、调幅 (AM) 和相关过程产生的不相关残留信号等来源造成的干扰。在多种现实环境下的广泛评估表明，我们的无声声学通信系统可以在 10cm 通信范围内实现超过 47kbps 的速度。我们还展示了将通信范围扩大到房间规模（即 2m 左右），同时保持高吞吐量和听不见度的可能性。我们的研究结果为未来在新兴移动和物联网应用中追求的听不见的声学通信技术提供了新的方向。
Acoustic communication is an increasingly popular alternative to existing short-range wireless communication technologies for mobile devices, such as NFC and QR codes. Unlike the current standards, there are no requirements for extra hardware, lighting conditions, or Internet connection. However, the audibility and limited throughput of existing studies hinder their deployment on a wide range of applications. In this paper, we aim to redesign acoustic communication mechanism to push the boundary of potential throughput while keeping the inaudibility. Specifically, we propose BatComm, a high-throughput and inaudible acoustic communication system for mobile devices capable of throughput rates 12X higher than contemporary state-of-the-art acoustic communication for mobile devices. We theoretically model the non-linearity of microphone and use orthogonal frequency division multiplexing (OFDM) to transmit data bits over multiple orthogonal channels with an ultrasound frequency carrier. We also design a series of techniques to mitigate interference caused by sources such as the signal's unbalanced frequency response, ambient noise, and unrelated residual signals created through OFDM, amplitude modulation (AM), and related processes. Extensive evaluations under multiple realistic settings demonstrate that our inaudible acoustic communication system can achieve over 47kbps within a 10cm communication range. We also show the possibility of increasing the communication range to room scale (i.e., around 2m) while maintaining high-throughput and inaudibility. Our findings offer a new direction for future inaudible acoustic communication techniques to pursue in emerging mobile and IoT applications.