威斯康星州的研究人员用安装在脚后跟的无线发射机取代了需要塞进鞋子里的数据线。

Rather than plugging a cable into a shoe, the Wisconsin researchers suggest installing a wireless transmitter in the heel.

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整个GPS系统，包括电池和供下载数据的无线发射机，比硬币还小。

Entire GPS systems, including batteries and wireless transmitters for downloading data, are now no bigger than a coin.

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射频指纹的唯一性是基于射频指纹识别无线发射机的基础问题。

Uniqueness of radio frequency fingerprint is the foundation of transmitter recognition based on RF fingerprint.

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