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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：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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4.发明申请公开(公告)号：US20170227623A1
公开(公告)日：2017-08-10
申请号：US15495972
申请日：2017-04-24
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Cuneyt Demirdag , Glen Wolverton , Devang Topiwala , Paul McFarthing
CPC classification number: G01S3/48 , G01S3/18 , G01S3/46 , H04B7/0413 , H04B7/0617 , H04B7/0802 , H04B7/086 , H04B7/10 , H04L7/0016 , H04L25/02 , H04L27/0014 , H04L2027/003 , H04L2027/0046 , H04L2027/0053 , H04L2027/0067 , H04W56/0035
Abstract: A method for determining an angle of arrival (AOA) of a received signal is disclosed, comprising: generating a baseband information signal by mixing a received signal with a local oscillator (LO) signal, the received signal being an in-phase signal and quadrature signal uncorrelated with each other and derived from different input data sets; obtaining baseband signal samples of the baseband information signal having an in-phase signal sample and a quadrature signal sample; determining a transmitter phase offset based on an estimated correlation between the in-phase signal samples and the quadrature signal samples; performing a plurality of phase measurements using a plurality of antennas to obtain a plurality of phase measurements; correcting the plurality of phase measurements based on the transmitter phase offset to produce a plurality of corrected phase measurement; and calculating an AOA of the received signal based on the difference between the plurality of corrected phase measurements.
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Patent Agency Ranking
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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6.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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7.发明授权公开(公告)号：US11085990B2
公开(公告)日：2021-08-10
申请号：US15929279
申请日：2020-04-21
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Cuneyt Demirdag , Glen Wolverton , Devang Topiwala , Paul McFarthing
IPC: G01S3/48 , H04L7/00 , H04B7/06 , G01S3/18 , H04L25/02 , H04W56/00 , H04B7/08 , G01S3/46 , H04B7/0413 , H04L27/00 , H04B7/10
Abstract: A method for determining an angle of arrival (AOA) of a received signal is disclosed, comprising: generating a baseband information signal by mixing a received signal with a local oscillator (LO) signal, the received signal being an in-phase signal and quadrature signal uncorrelated with each other and derived from different input data sets; obtaining baseband signal samples of the baseband information signal having an in-phase signal sample and a quadrature signal sample; determining a transmitter phase offset based on an estimated correlation between the in-phase signal samples and the quadrature signal samples; performing a plurality of phase measurements using a plurality of antennas to obtain a plurality of phase measurements; correcting the plurality of phase measurements based on the transmitter phase offset to produce a plurality of corrected phase measurement; and calculating an AOA of the received signal based on the difference between the plurality of corrected phase measurements.
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8.发明申请公开(公告)号：US20180054269A1
公开(公告)日：2018-02-22
申请号：US15683770
申请日：2017-08-22
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park , Paul McFarthing
CPC classification number: H04J11/0036 , H04J2011/0096 , H04J2211/006 , 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：US20170111197A1
公开(公告)日：2017-04-20
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
CPC classification number: H04L27/265 , H04J11/00 , H04L27/2636 , H04L27/266 , H04L27/2671 , H04L27/2676 , H04L27/2682 , H04W56/002
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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