Abstract
The development of virtual input is a long-standing hot topic in the human-computer interaction (HCI) community. In this work, we present a universal virtual keyboard that reuses a commodity 60GHz Wi-Fi radio as a radar. By leveraging the unique advantages of millimeter-wave (mmWave) signals, the proposed system can convert any flat surface into an effective typing media and support multiple keyboard layouts (e.g., computer keyboard and piano keyboard). We design a novel signal processing pipeline to detect, segment and separate, and finally recognize keystrokes. The proposed virtual keyboard system enables concurrent keystrokes and does not need any training except for a minimal one-time effort of only three key-presses for keyboard calibration upon the initial setup. Extensive experiments demonstrate an overall accuracy of >95% for single-key case and a recognition accuracy >90% for multi-key scenario.
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