Cross-Technology Communication (CTC) is an emerging technique that enables direct communication across different wireless technologies. The state-of-the-art works in this area propose physical-level CTC, in which the transmitters emulate signals that follow the receiver’s standard. Physical-level CTC means considerable processing complexity at the transmitter, which does not apply to the communication from a low-end transmitter to a high-end receiver. This article proposes LEGO-Fi, which supports the CTC from ZigBee to WiFi and Bluetooth to WiFi. LEGO-Fi is a transmitter-transparent CTC technique, which leaves the processing complexity solely at the receiver side and therefore, makes a critical advance toward bidirectional high-throughput CTC. The key technique inside is cross-demapping, which stems from two key technical insights: 1) a ZigBee/Bluetooth packet leaves distinguishable features when passing the WiFi modules and 2) compared to ZigBee’s/Bluetooth’s simple encoding and modulation schemes, the rich processing capacity of WiFi offers extra flexibility to process a ZigBee/Bluetooth packet. The evaluation results show that LEGO-Fi achieves a throughput of 213.6 Kb/s in practice, which is, respectively, $13000\times $ , $1200\times $ , and $7.5\times $ faster than FreeBee, ZigFi, and SymBee, the three existing ZigBee-to-WiFi CTC approaches. For the CTC from Bluetooth to WiFi, LEGO-Fi achieves a throughput of 904.1 Kb/s.

中文翻译：

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LEGO-Fi：具有交叉重叠功能的发射器透明CTC

跨技术通信（CTC）是一种新兴技术，可实现跨不同无线技术的直接通信。该领域的最新技术提出了物理级别的CTC，其中，发射机模拟遵循接收机标准的信号。物理级CTC意味着发射机处相当大的处理复杂性，不适用于从低端发射机到高端接收机的通信。本文提出了LEGO-Fi，它支持从ZigBee到WiFi以及从蓝牙到WiFi的CTC。LEGO-Fi是一种透明的发射器CTC技术，其处理复杂性完全留在接收器一侧，因此，在向双向高通量CTC方面取得了重要进展。内部的关键技术是交叉解映射，它来自两个关键的技术见解：1）ZigBee / Bluetooth数据包通过WiFi模块时具有明显的功能； 2）与ZigBee / Bluetooth的简单编码和调制方案相比，WiFi的丰富处理能力为处理ZigBee / Bluetooth数据包提供了额外的灵活性。评估结果表明，LEGO-Fi在实践中实现了213.6 Kb / s的吞吐量，分别是 $ 13000 \次$ ， $ 1200 \次$ ， 和 $ 7.5 \次$ 现有的三种ZigBee-to-WiFi CTC方法比FreeBee，ZigFi和SymBee更快。对于从蓝牙到WiFi的CTC，LEGO-Fi的吞吐量达到904.1 Kb / s。