Samsung Electronics Co., Ltd.

Bilal Sadiq

Jianzhong Zhang

Boon Loong Ng

Hao Chen

Vishnu Vardhan Ratnam

Abhishek Sehgal

A method includes obtaining Wi-Fi channel state information (CSI) parameters measured at an anchor and a target device from Wi-Fi frames transmitted between the anchor and the target device, the CSI parameters comprising, for each of the anchor and the target device, frame transmission and reception times, a carrier phase of the CSI, a crystal offset factor, and a packet detection time error. The method also includes determining a round trip time (RTT) estimate or a relative change in the RTT estimate as a function of the CSI parameters. The method further includes estimating a range between the anchor and the target device as a function of the RTT estimate, or estimating a change in the range between the anchor and the target device as a function of the relative change in the RTT estimate.

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Plano, TX, United States of America

Bilal Sadiq