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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
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.
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公开(公告)号：US10200232B1
公开(公告)日：2019-02-05
申请号：US15800634
申请日：2017-11-01
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： David D. Wentzloff , Hun-Seok Kim , Avish Kosari
Abstract: A digital quadrature architecture is presented that employs switched current digital power amplifiers and uses a digital class-B input code profile in combination with non-overlapping LO signals to overcome the low efficiency problems of conventional quadrature architectures. By employing digital class-B signals, the number of I/Q cells is reduced to half and the need for extra processing of the sign bits is eliminated in the transmitters, thereby improving the efficiency.
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公开(公告)号：US10515455B2
公开(公告)日：2019-12-24
申请号：US15279581
申请日：2016-09-29
Applicant: The Regents of the University of Michigan
Inventor： Ziyun Li , Hun-Seok Kim
Abstract: Optical flow is measured between a first image and a second image by evaluating a match quantifying parameter in respect of a set of candidate flow vectors. The set of candidate flow vectors includes one or more flow vectors selected in dependence upon one or more neighbor flow vectors associated with one or more neighboring pixels to the given pixel which have previously calculated respective match quantifying parameters indicative of closest matches for the one or more neighboring pixels. The set of candidate flow vectors also includes adjacent flow vectors corresponding to target pixels surrounding the target pixels identified by the neighbor flow vectors. One or more randomly selected random flow vectors is also added to the set of candidate flow vectors. The calculated match quantifying parameters are weighted in dependence upon whether the corresponding candidate flow vector is similar to any other candidate flow vector.
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Patent Agency Ranking
公开(公告)号：US10541843B2
公开(公告)日：2020-01-21
申请号：US15919510
申请日：2018-03-13
Applicant: The Regents of The University of Michigan
Inventor： David D. Wentzloff , Hun-Seok Kim , Jaeho Im
IPC: H04L27/152 , H04B1/00 , H04B1/403 , H04L5/00
Abstract: An ultra-low power back-channel receiver is presented that demodulates binary a FSK back-channel signal embedded in 5.8 GHz IEEE 802.11a Wi-Fi OFDM packets. The architecture of the back-channel receiver employs a two-step down-conversion where the first mixing stage downconverts using the third harmonic of the local oscillator for power efficiency. The LP-65 nm CMOS receiver consumes 335 μW with a sensitivity of −72 dBm at a BER of 10−3 and data-rate of 31.25 kb/s. The radio uses a balun and a 250 kHz reference crystal as external components. The receiver uses a 1V supply voltage for analog blocks, and 0.85V for digital blocks including the local oscillator and the frequency-locked loop circuits.
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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
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.
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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
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.
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公开(公告)号：US11911128B2
公开(公告)日：2024-02-27
申请号：US17173976
申请日：2021-02-11
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： David T. Blaauw , Jamie Phillips , Cynthia Anne Chestek , Taekwang Jang , Hun-Seok Kim , Dennis Sylvester , Jongyup Lim , Eunseong Moon , Michael Barrow , Samuel Nason , Julianna Richie , Paras Patel
IPC: A61B5/00 , H04B10/80 , H04B10/114 , A61B5/37 , A61B5/384
CPC classification number: A61B5/0017 , A61B5/0006 , A61B5/0031 , A61B5/37 , A61B5/384 , H04B10/114 , H04B10/80 , A61B2560/0219
Abstract: A mote includes an optical receiver that wirelessly receives a power and data signal in form of NIR light energy within a patient and converts the NIR light energy to an electrical signal having a supply voltage. A control module supplies the supply voltage to power devices of the mote. A clock generation circuit locks onto a target clock frequency based on the power and data signal and generates clock signals. A data recovery circuit sets parameters of one of the devices based on the power and data signal and a first clock signal. An amplifier amplifies a neuron signal detected via an electrode inserted in tissue of the patient. A chip identifier module, based on a second clock signal, generates a recorded data signal based on a mote chip identifier and the neuron signal. A driver transmits the recorded data signal via a LED or a RF transmitter.
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8.发明授权公开(公告)号：US11496174B1
公开(公告)日：2022-11-08
申请号：US17162056
申请日：2021-01-29
Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Inventor： Hun-Seok Kim , Chin-Wei Hsu , David T. Blaauw , Benjamin Kempke
Abstract: When the ultra-low power mm-scale sensor node does not have a crystal oscillator and phase-lock loop, it inevitably exhibits significant carrier frequency offset (CFO) and sampling frequency offset (SFO) with respect to the reference frequencies in the gateway. This disclosure enables efficient real-time calculation of accurate SFO and CFO at the gateway, thus the ultra-low power mm-scale sensor node can be realized without a costly and bulky clock reference crystal and also power-hungry phase lock loop. In the proposed system, the crystal-less sensor starts transmission with repetitive RF pulses with a constant interval, followed by the data payload using pulse-position modulation (PPM). A proposed algorithm uses a two-dimensional (2D) fast Fourier transform (FFT) based process that identifies the SFO and CFO at the same time to establish successful wireless communication between the gateway and crystal-less sensor nodes.
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