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公开(公告)号：US10454741B2
公开(公告)日：2019-10-22
申请号：US15295349
申请日：2016-10-17
Applicant: PhasorLab, Inc.
Inventor： Paul McFarthing , Joshua C. Park , Jian Cui , Cuneyt Demirdag , Glen Wolverton , Devang Topiwala
Abstract: Methods and systems are described for frequency domain correction, time domain correction, and combinations thereof. Each Long Term Evolution (LTE) uplink residual frequency offset can be determined with less than 1 part per billion accuracy simultaneously and used for frequency offset correction. The disclosed method utilizes the same modulated signals for data and control as the 3GPP LTE wireless standard and can be embedded directly into the base station (downlink) PHY without additional hardware. The use of the disclosed methods provide multiple ways to simultaneously improve the uplink data throughput for every user in an LTE multiple access wireless system.
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公开(公告)号：US10243682B2
公开(公告)日：2019-03-26
申请号：US15683770
申请日：2017-08-22
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park , Paul McFarthing
Abstract: Systems and methods for canceling carrier frequency offset (CFO) and sampling frequency offset (SFO) in a radio receive chain are disclosed. In one embodiment, a method is disclosed, comprising: receiving a sub-frame via a radio receive chain in a time domain; performing per-user filtering on the sub-frame to obtain a signal for a particular user; obtaining a CFO correction signal; adding the CFO correction signal in the time domain to perform a CFO correction step on the signal for the particular user; performing an FFT on the output of the CFO correction step to obtain samples in a frequency domain; adding an SFO correction signal in the frequency domain to perform an SFO correction to the output of FFT step; and demodulating the output of SFO correction step, thereby performing CFO and SFO correction while reducing inter-carrier interference (ICI).
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公开(公告)号：US20240048412A1
公开(公告)日：2024-02-08
申请号：US18488927
申请日：2023-10-17
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Paul Christopher McFarthing , Jian Cui
CPC classification number: H04L25/0224 , H04L25/0242 , H04W4/029 , H04L5/0048
Abstract: A method of positioning using a shortest path based on a synthesized wideband channel estimate is described. In some embodiments, a method is disclosed, comprising: distributing an uplink schedule to a plurality of synchronized nodes; continuously capturing a reference signal across a plurality of carrier frequencies until frequency coverage for the synthetic wide band is achieved; removing frequency offset; calculating a plurality of channel estimates for the captured reference signal; aligning the plurality of channel estimates; combining the plurality of channel estimates to construct a single channel estimate of the synthetic wide band; deriving a shortest delay for the received reference signal; and using the derived shortest delay to estimate a time of arrival and thereby determine an estimated location.
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公开(公告)号：US20220294669A1
公开(公告)日：2022-09-15
申请号：US17695819
申请日：2022-03-15
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Paul Christopher McFarthing , Jian Cui
Abstract: A method of positioning using a shortest path based on a synthesized wideband channel estimate is described. In some embodiments, a method is disclosed, comprising: distributing an uplink schedule to a plurality of synchronized nodes; continuously capturing a reference signal across a plurality of carrier frequencies until frequency coverage for the synthetic wide band is achieved; removing frequency offset; calculating a plurality of channel estimates for the captured reference signal; aligning the plurality of channel estimates; combining the plurality of channel estimates to construct a single channel estimate of the synthetic wide band; deriving a shortest delay for the received reference signal; and using the derived shortest delay to estimate a time of arrival and thereby determine an estimated location.
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公开(公告)号：US11644314B2
公开(公告)日：2023-05-09
申请号：US16835298
申请日：2020-03-30
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park
Abstract: Systems and methods are disclosed herein for blind frequency synchronization. In one embodiment, a synthetic inertial measurement unit (IMU) is disclosed, comprising: a plurality of nodes wirelessly coupled to each other, each The method may further comprise: a wireless transceiver at a particular node for providing wireless communications with at least one other node of the plurality of nodes, configured to receive I and Q radio samples from the other node, and to determine a frequency offset of the other node based on the received I and Q radio samples, and to synchronize a clock at the particular node, a frequency offset synchronization module at the particular node coupled to the wireless transceiver, at the particular node, and an IMU sensor for determining rotation, acceleration, and speed of the particular node; and an IMU location estimation module for using time of arrival information assuming that the clock may be synchronized at the node, the determined distance, and the rotation, acceleration, and speed of the particular node received from the IMU sensor to determine the location of the nodes, thereby providing enhanced determination of location of the plurality of nodes.
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Patent Agency Ranking
公开(公告)号：US20220394588A1
公开(公告)日：2022-12-08
申请号：US17805451
申请日：2022-06-03
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Paul McFarthing , Jian Cui , Devang Topiwala , Pranay Kumar Eedara , Yongsoon Lee
IPC: H04W40/04 , H04L45/17 , H04L45/122 , H04L45/00
Abstract: A self-organizing mesh network system is disclosed, comprising: at least one master node generating a timing reference signal; a plurality of regular nodes deriving time synchronization from the timing reference signal; and a wireless medium for communicating location and timestamp information among the plurality of regular nodes, The plurality of regular nodes may be configured to each use communicated location and timestamp information of nearby nodes to independently generate a location map of the nearby nodes. The plurality of regular nodes may be configured to accept an additional regular node. The plurality of regular nodes may be configured to allow a node of the plurality of regular nodes to exit the plurality of regular nodes. The plurality of regular nodes may each use communicated location and timestamp information of the plurality of regular nodes to independently generate a location map of each of the plurality of regular nodes.
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公开(公告)号：US20200309531A1
公开(公告)日：2020-10-01
申请号：US16835298
申请日：2020-03-30
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park
Abstract: Systems and methods are disclosed herein for blind frequency synchronization. In one embodiment, a synthetic inertial measurement unit (IMU) is disclosed, comprising: a plurality of nodes wirelessly coupled to each other, each The method may further comprise: a wireless transceiver at a particular node for providing wireless communications with at least one other node of the plurality of nodes, configured to receive I and Q radio samples from the other node, and to determine a frequency offset of the other node based on the received I and Q radio samples, and to synchronize a clock at the particular node, a frequency offset synchronization module at the particular node coupled to the wireless transceiver, at the particular node, and an IMU sensor for determining rotation, acceleration, and speed of the particular node; and an IMU location estimation module for using time of arrival information assuming that the clock may be synchronized at the node, the determined distance, and the rotation, acceleration, and speed of the particular node received from the IMU sensor to determine the location of the nodes, thereby providing enhanced determination of location of the plurality of nodes.
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公开(公告)号：US10944496B2
公开(公告)日：2021-03-09
申请号：US16363467
申请日：2019-03-25
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park , Paul McFarthing
Abstract: Systems and methods for canceling carrier frequency offset (CFO) and sampling frequency offset (SFO) in a radio receive chain are disclosed. In one embodiment, a method is disclosed, comprising: receiving a sub-frame via a radio receive chain in a time domain; performing per-user filtering on the sub-frame to obtain a signal for a particular user; obtaining a CFO correction signal; adding the CFO correction signal in the time domain to perform a CFO correction step on the signal for the particular user; performing an FFT on the output of the CFO correction step to obtain samples in a frequency domain; adding an SFO correction signal in the frequency domain to perform an SFO correction to the output of FFT step; and demodulating the output of SFO correction step, thereby performing CFO and SFO correction while reducing inter-carrier interference (ICI).
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9.发明申请公开(公告)号：US20190222337A1
公开(公告)日：2019-07-18
申请号：US16363467
申请日：2019-03-25
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park , Paul McFarthing
CPC classification number: H04J11/0036 , H04J2011/0096 , H04J2211/006 , H04L25/03159 , H04L25/03821 , H04L27/2626 , H04L27/2636 , H04L27/265 , H04L27/2657 , H04L27/2676 , H04L27/36
Abstract: Systems and methods for canceling carrier frequency offset (CFO) and sampling frequency offset (SFO) in a radio receive chain are disclosed. In one embodiment, a method is disclosed, comprising: receiving a sub-frame via a radio receive chain in a time domain; performing per-user filtering on the sub-frame to obtain a signal for a particular user; obtaining a CFO correction signal; adding the CFO correction signal in the time domain to perform a CFO correction step on the signal for the particular user; performing an FFT on the output of the CFO correction step to obtain samples in a frequency domain; adding an SFO correction signal in the frequency domain to perform an SFO correction to the output of FFT step; and demodulating the output of SFO correction step, thereby performing CFO and SFO correction while reducing inter-carrier interference (ICI).
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公开(公告)号：US20170118060A1
公开(公告)日：2017-04-27
申请号：US15397689
申请日：2017-01-03
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park
CPC classification number: H04L27/2659 , H04J11/0036 , H04L5/0007 , H04L27/265 , H04L27/2657 , H04L27/2676 , H04L2025/0342
Abstract: A synchronizing radio receiver is disclosed, comprising: an analog baseband receive chain and a digital baseband receive chain. The digital baseband receive chain may comprise an analog to digital converter, a frame synchronization module, a frequency synchronization module, and an orthogonal frequency division multiplexing (OFDM) demodulator, wherein the frequency synchronization module is configured to cross-correlate a plurality of in-phase and quadrature samples to generate a synchronization signal and output the synchronization signal to a local oscillator in the analog baseband receive chain. The digital baseband receive chain may also further comprise a carrier frequency offset (CFO)/sampling frequency offset (SFO) correction module coupled to a frequency synchronization module configured to cross-correlate a plurality of in-phase and quadrature samples, with the CFO/SFO correction module configured to apply correction in a digital domain before outputting a corrected signal to the OFDM demodulator.
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