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公开(公告)号：US20210092698A1
公开(公告)日：2021-03-25
申请号：US17109132
申请日：2020-12-01
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Glen Wolverton
Abstract: Systems and methods for wireless synchronization are disclosed. In one embodiment, a method is disclosed for synchronizing a slave device to a master device, comprising: receiving, at a local device, a master device reference signal in the form of a modulated radio frequency (RF) signal from a master device; receiving, at the local device, a master device time stamp from the master device; computing a time offset of the master device reference signal relative to a local reference oscillator signal of a local oscillator, using the master device time stamp; computing a frequency offset of the master device reference signal relative to the local reference oscillator signal; generating a local reference oscillator control signal based on the computed time offset and the computer frequency offset; and adjusting the local reference oscillator to maintain a frequency and time lock with the master device reference signal at the local device.
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公开(公告)号：US10326632B2
公开(公告)日：2019-06-18
申请号：US15397689
申请日：2017-01-03
Applicant: PhasorLab, Inc.
Inventor： Jian Cui , Joshua C. Park
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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23.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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25.发明授权Blind carrier synchronization method for OFDM wireless communication systems 有权用于OFDM无线通信系统的盲载波同步方法公开(公告)号：US09538537B1
公开(公告)日：2017-01-03
申请号：US15235052
申请日：2016-08-11
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: Systems and methods are disclosed herein for blind frequency synchronization. In one embodiment, a method is disclosed, comprising: downconverting a received orthogonal frequency division multiplexed (OFDM) signal to baseband; identifying, from the downconverted received signal, a series of OFDM symbols in the time domain; performing a fast Fourier transform (FFT) on a block of several time domain samples to turn the time domain OFDM symbols into frequency domain OFDM symbols, one sample per subcarrier in the received OFDM signal; computing a cross-correlation between in-phase and quadrature samples in each subcarrier and for each frequency domain OFDM symbol, wherein the cross-correlation may be computed as a sum of products of either squares or absolute values of the in-phase and quadrature samples; and summing the computed cross-correlation across the series of symbols and across all subcarriers to determine a frequency offset for the received OFDM signal.
Abstract translation: 本文公开了用于盲频同步的系统和方法。 在一个实施例中，公开了一种方法，包括：将接收到的正交频分复用（OFDM）信号下变频到基带; 从下变频的接收信号中识别时域中的一系列OFDM符号; 在几个时域样本的块上执行快速傅里叶变换（FFT），以将时域OFDM符号转换成频域OFDM符号，在接收的OFDM信号中每子载波一个采样; 计算每个子载波和每个频域OFDM符号的同相和正交样本之间的互相关，其中可以将互相关计算为同相和正交样本的平方或绝对值的乘积之和 ; 并且对所述一系列符号和所有子载波之间的所计算的互相关求和，以确定所接收的OFDM信号的频率偏移。
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Patent Agency Ranking
公开(公告)号：US20150295704A1
公开(公告)日：2015-10-15
申请号：US14727861
申请日：2015-06-01
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park
CPC classification number: H04W56/006 , G01S3/18 , H04B7/0413 , H04L7/0016 , H04L25/02 , H04L27/0014 , H04L27/364 , H04L2027/003 , H04L2027/0046 , H04L2027/0053 , H04L2027/0067 , H04W56/0035 , H04W64/006
Abstract: A method comprising generating a baseband information signal by mixing a received modulated carrier signal with a local oscillator (LO) signal having an LO frequency; obtaining baseband signal samples of the baseband information signal having a baseband signal magnitude and a baseband signal phase; determining a cumulative phase measurement associated with baseband signal samples having a baseband signal magnitude greater than a threshold; and, applying a correction signal to compensate for an LO frequency offset of the LO frequency based on the cumulative phase.
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公开(公告)号：US20230413198A1
公开(公告)日：2023-12-21
申请号：US18458092
申请日：2023-08-29
Applicant: Parallel Wireless, Inc. , PhasorLab, Inc.
Inventor： Ramesh Annavajjala , Efi Dror , Steven Paul Papa , Joshua C. Park , Soumendra Nanda , Prashanth Rao
CPC classification number: H04W56/001 , H04W88/16 , H04W48/16 , H04L5/0048 , H04W16/32
Abstract: Systems and methods are disclosed for providing base station localization. In one embodiment the system includes a network including a base station such as a 5G gNodeB (gNB); a Hetnet Gateway (HNG) in communication with the gNB, wherein the HNG includes a location server and wherein the HNG virtualizes and abstracts a collection of base stations and provides a complex network under its purview as a simple base station to a mobile packet core network; a plurality of Hyper Sync Network (HSN) nodes in communication with the gNB and the HNG, wherein the plurality of HSN nodes listen to User Equipments (UEs) to locate the UEs and to synchronize clocks on the gNB with the collection of HSN nodes or other gNBs; and an Evolved Serving Mobile Location Center (E-SMLC) server in communication with the HNG and for reporting the location of a UE.
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公开(公告)号：US11743846B2
公开(公告)日：2023-08-29
申请号：US17323772
申请日：2021-05-18
Applicant: Parallel Wireless, Inc. , PhasorLab, Inc.
Inventor： Ramesh Annavajjala , Efi Dror , Steven Paul Papa , Joshua C. Park , Soumendra Nanda , Prashanth Rao
CPC classification number: H04W56/001 , H04L5/0048 , H04W16/32 , H04W48/16 , H04W88/16
Abstract: Systems and methods are disclosed for providing base station localization. In one embodiment the system includes a network including a base station such as a 5G gNodeB (gNB); a Hetnet Gateway (HNG) in communication with the gNB, wherein the HNG includes a location server and wherein the HNG virtualizes and abstracts a collection of base stations and provides a complex network under its purview as a simple base station to a mobile packet core network; a plurality of Hyper Sync Network (HSN) nodes in communication with the gNB and the HNG, wherein the plurality of HSN nodes listen to User Equipments (UEs) to locate the UEs and to synchronize clocks on the gNB with the collection of HSN nodes or other gNBs; and an Evolved Serving Mobile Location Center (E-SMLC) server in communication with the HNG and for reporting the location of a UE.
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29.发明申请公开(公告)号：US20220400454A1
公开(公告)日：2022-12-15
申请号：US17806943
申请日：2022-06-14
Applicant: PhasorLab, Inc.
Inventor： Joshua C. Park , Devang Topiwala
Abstract: A self-organizing mesh network and protocol, herein identified as the HSN Mesh or Self-Expanding Mesh (SEM), enables dynamic addition and subtraction of mesh nodes by allowing nodes to claim a conflict-free slot for transmission. Slot allocation will not be fixed or predetermined and will be performed in a decentralized manner that suits the existing SEM mesh structure which does not have any strict hierarchy or central coordinator nodes. The dynamic slot allocation strategy will allow the seamless expansion of the mesh. The disclosed self-organizing mesh is: a distributed self organizing mobile mesh network; highly reliable and resilient mesh through redundant connections and built in self-discovery; and a peer to peer network with flat hierarchy, meaning no need for central hub or coordinator node. Distributed slot reusability ensures efficient slot allocation. synchronized mesh allows to deploy time critical applications
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30.发明授权公开(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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