Presence detection calibration

Abstract

A system may use Wi-Fi channel state information (CSI) to configure ultrasonic presence detection (USPD) in a user device. Minor motion events in the vicinity of the user device may occur close to the noise floor of USPD such that noise transients can trigger false presence readings. In contrast, CSI can be highly sensitive to minor movements but may detect motion outside the area of interest; for example, in another room. Accordingly, the system may use CSI to confirm vacancy for purposes of tuning USPD. A first implementation of the system may use CSI to configure conditions for USPD-based state transitions in an adaptive state machine. A second implementation may use statistical methods to calculate parameters for detecting minor motion in USPD data. A third implementation may knowledge distillation techniques to transfer an embedding space from a network that processes CSI to a network that processes ultrasound data.