公开(公告)号：US10746844B2

公开(公告)日：2020-08-18

申请号：US16654547

申请日：2019-10-16

Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN

Inventor： Li-Xuan Chuo ,  Hun-Seok Kim ,  David T. Blaauw ,  Dennis Sylvester ,  Mingyu Yang

IPC: H04W24/00 ,  G01S5/02 ,  H04L27/26 ,  G01S11/08 ,  H04L5/14 ,  H04W64/00

Abstract: A system is presented for non-line-of-sight localization between RF enabled devices. A transmitting node is configured to transmit an RF ranging signal at a first carrier frequency, where the RF ranging signal is modulated with a symbol. The reflecting node is configured to receive the RF ranging signal and further operates to convert the RF ranging signal to a second carrier frequency and retransmit the converted ranging signal while simultaneously receiving the RF ranging signal. The localizing node is configured to receive the converted ranging signal from the reflecting node. The localizing node operates to identify, in frequency domain, the symbol in the converted ranging signal and compute a distance between the reflecting node and the localizing node based in part on the identified symbol in the converted ranging signal. The transmitting node and the localizing node may be on the same or different devices.

公开(公告)号：US10447318B2

公开(公告)日：2019-10-15

申请号：US15887212

申请日：2018-02-02

Applicant: The Regents of The University of Michigan

Inventor： David T. Blaauw ,  David D. Wentzloff ,  Li-Xuan Chuo ,  Hun-Seok Kim

IPC: H04B1/04 ,  H01Q7/00 ,  H03B5/12 ,  H04B1/40

Abstract: A wireless communication device is presented for use with a sensor. The wireless communication device includes: an antenna, a driver circuit and a bias circuit. The driver circuit is electrically coupled to the antenna and includes at least one pair of cross-coupled transistors. The bias circuit is electrically coupled to the driver circuit. In a transmit mode, the bias circuit biases the driver circuit with a first bias current. In response to the first bias current, the driver circuit oscillates the antenna. In a receive mode, the bias circuit biases the driver circuit with a second bias current, such that the first bias current differs from the second bias current. In response to the second bias current, the bias circuit amplifies a signal received by the antenna.

公开(公告)号：US20180227002A1

公开(公告)日：2018-08-09

申请号：US15887212

申请日：2018-02-02

Applicant: The Regents of The University of Michigan

Inventor： David T. Blaauw ,  David D. Wentzloff ,  Li-Xuan Chuo ,  Hun-Seok Kim

IPC: H04B1/04 ,  H01Q7/00 ,  H03B5/12

CPC classification number: H04B1/04 ,  H01Q7/00 ,  H03B5/1212 ,  H03B5/1215 ,  H03B5/1228 ,  H03B2200/0008 ,  H03B2200/0082 ,  H03D1/22 ,  H03D2200/006 ,  H04B1/40

Abstract: A wireless communication device is presented for use with a sensor. The wireless communication device includes: an antenna, a driver circuit and a bias circuit. The driver circuit is electrically coupled to the antenna and includes at least one pair of cross-coupled transistors. The bias circuit is electrically coupled to the driver circuit. In a transmit mode, the bias circuit biases the driver circuit with a first bias current. In response to the first bias current, the driver circuit oscillates the antenna. In a receive mode, the bias circuit biases the driver circuit with a second bias current, such that the first bias current differs from the second bias current. In response to the second bias current, the bias circuit amplifies a signal received by the antenna.