公开(公告)号：US11531087B2

公开(公告)日：2022-12-20

申请号：US17180762

申请日：2021-02-20

申请人： Yuqian Hu ,  Feng Zhang ,  Beibei Wang ,  Chenshu Wu ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

发明人： Yuqian Hu ,  Feng Zhang ,  Beibei Wang ,  Chenshu Wu ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

IPC分类号： G01S7/41 ,  G08B21/04 ,  G01S13/00 ,  G06N20/00

摘要： Methods, apparatus and systems for periodic or transient motion detection, e.g. fall event detection, based on wireless signals are described. In one example, a described system comprises: a transmitter configured for transmitting a first wireless signal through a wireless multipath channel of a venue; a receiver configured for receiving a second wireless signal through the wireless multipath channel; and a processor. The second wireless signal differs from the first wireless signal due to the wireless multipath channel that is impacted by a target motion of an object in the venue. The processor is configured for: obtaining a time series of channel information (TSCI) of the wireless multipath channel based on the second wireless signal, computing a time series of spatial-temporal information (STI) of the object based on the TSCI, and detecting the target motion of the object based on the time series of STI (TSSTI).

公开(公告)号：US11500056B2

公开(公告)日：2022-11-15

申请号：US16871000

申请日：2020-05-10

申请人： Chenshu Wu ,  Feng Zhang ,  Beibei Wang ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

发明人： Chenshu Wu ,  Feng Zhang ,  Beibei Wang ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

IPC分类号： G01S5/06 ,  G01S5/02

摘要： Methods, apparatus and systems for wireless tracking with graph-based particle filtering are described. A described wireless monitoring system comprises a transmitter transmitting a series of probe signals, a receiver, and a processor. The receiver is configured for: receiving the series of probe signals modulated by the wireless multipath channel and an object moving in a venue, and obtaining a time series of channel information (TSCI) of the wireless multipath channel from the series of probe signals. The processor is configured for: monitoring a motion of the object relative to a map based on the TSCI, determining an incremental distance travelled by the object in an incremental time period based on the TSCI, and computing a next location of the object at a next time in the map based on at least one of: a current location of the object at a current time, the incremental distance, and a direction of the motion during the incremental time period.

公开(公告)号：US20220291328A1

公开(公告)日：2022-09-15

申请号：US17827902

申请日：2022-05-30

申请人： Muhammed Zahid Ozturk ,  Chenshu Wu ,  Beibei Wang ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

发明人： Muhammed Zahid Ozturk ,  Chenshu Wu ,  Beibei Wang ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

IPC分类号： G01S5/06 ,  G01S5/02

摘要： Methods, apparatus and systems for radio-assisted signal estimation are described. In one example, a described system comprises: a sensor configured to obtain a baseband mixture signal in a venue; a transmitter configured to transmit a first radio signal through a wireless channel of the venue; a receiver configured to receive a second radio signal through the wireless channel; and a processor. The baseband mixture signal comprises a mixture of a first source signal and an additional signal. The first source signal is generated by a first motion of a first object in the venue. The second radio signal differs from the first radio signal due to the wireless channel and at least the first motion of the first object in the venue. The processor is configured for: obtaining a radio feature of the second radio signal, constructing a first adaptive filter for the baseband mixture signal based on the radio feature, filtering the baseband mixture signal using the first adaptive filter to obtain a first output signal, and generating an estimation of the first source signal based on the first output signal.

公开(公告)号：US11444710B2

公开(公告)日：2022-09-13

申请号：US16945827

申请日：2020-08-01

申请人： Dan Bugos ,  Feng Zhang ,  Chun-Chia Jack Shih ,  Beibei Wang ,  Oscar Chi-Lim Au ,  K. J. Ray Liu

发明人： Dan Bugos ,  Feng Zhang ,  Chun-Chia Jack Shih ,  Beibei Wang ,  Oscar Chi-Lim Au ,  K. J. Ray Liu

IPC分类号： H04B17/309 ,  H04B17/24 ,  G01S11/02 ,  H04B7/08 ,  H04B17/391 ,  H04B17/21

摘要： Methods, apparatus and systems for wireless sensing are described. In one embodiment, a described presentation system comprises: a presentation device with a user-interface; a processor communicatively coupled to the presentation device; a memory communicatively coupled to the processor; and a set of instructions stored in the memory. The set of instructions, when executed by the processor, causes the processor to perform: determining a plurality of time series of analytics (TSA) associated with a lifelog of a living object, determining a common time axis for the plurality of TSA, and generating a presentation that presents the plurality of TSA synchronously and jointly in a hybrid manner based on the common time axis. The presentation is presented on the user-interface of the presentation device.

公开(公告)号：USD956070S1

公开(公告)日：2022-06-28

申请号：US29764229

申请日：2020-12-29

申请人： Chao-Lun Mai ,  Dan Bugos ,  Beibei Wang ,  Oscar Chi-Lim Au ,  K. J. Ray Liu

设计人： Chao-Lun Mai ,  Dan Bugos ,  Beibei Wang ,  Oscar Chi-Lim Au ,  K. J. Ray Liu

公开(公告)号：US11340328B2

公开(公告)日：2022-05-24

申请号：US17214838

申请日：2021-03-27

申请人： Fengyu Wang ,  Beibei Wang ,  Xiaolu Zeng ,  Chenshu Wu ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

发明人： Fengyu Wang ,  Beibei Wang ,  Xiaolu Zeng ,  Chenshu Wu ,  K. J. Ray Liu ,  Oscar Chi-Lim Au

IPC分类号： G01S7/00 ,  G01S13/00 ,  G01S13/56 ,  G01S7/41 ,  H04W84/18

摘要： Methods, apparatus and systems for wireless vital monitoring are described. In one example, a described system comprises: a transmitter configured for transmitting a first wireless signal through a wireless channel of a venue; a receiver configured for receiving a second wireless signal through the wireless channel; and a processor. The second wireless signal comprises a reflection of the first wireless signal by at least one living being having at least one repetitive motion in the venue. The processor is configured for: obtaining a time series of channel information (TSCI) of the wireless channel based on the second wireless signal; generating, for each living being of the at least one living being, a vital signal representing all repetitive motions of the living being based on the TSCI; extracting, from the vital signal of each living being, a heartbeat signal; and monitoring, for each living being in the venue, a heart rate variability based on the heartbeat signal.

公开(公告)号：US20210190702A1

公开(公告)日：2021-06-24

申请号：US17180760

申请日：2021-02-20

申请人： Chenshu Wu ,  Beibei Wang ,  Oscar Chi-Lim Au ,  Feng Zhang ,  K. J. Ray Liu

发明人： Chenshu Wu ,  Beibei Wang ,  Oscar Chi-Lim Au ,  Feng Zhang ,  K. J. Ray Liu

IPC分类号： G01N22/00

摘要： Methods, apparatus and systems for wireless material sensing are described. In one example, a described system comprises: a transmitter configured for transmitting, using transmit antennas, a first wireless signal through a wireless multipath channel of a venue; a receiver configured for receiving, using receive antennas, a second wireless signal through the wireless multipath channel; and a processor. The second wireless signal comprises a reflection or a refraction of the first wireless signal at a surface of a target material of an object in the venue. The processor is configured for: obtaining a plurality of channel information (CI) of the wireless multipath channel based on the second wireless signal, wherein each CI is associated with a respective transmit antenna and a respective receive antenna; computing a material analytics based on the plurality of CI; and determining a type of the target material of the object based on the material analytics.

公开(公告)号：US07848443B2

公开(公告)日：2010-12-07

申请号：US11471521

申请日：2006-06-21

申请人： Chaiyod Pirak ,  Z. Jane Wang ,  K. J. Ray Liu

发明人： Chaiyod Pirak ,  Z. Jane Wang ,  K. J. Ray Liu

IPC分类号： H04B7/02 ,  H04B7/10 ,  H04L27/00

CPC分类号： H04W52/367 ,  H04L25/0226 ,  H04W52/16 ,  H04W52/325 ,  H04W52/346 ,  H04W52/42

摘要： Pilot data and data-bearer data are formed to be mutually orthogonal and in each other's null-space. Data to be transmitted is first modulated with the data-bearer matrix and then pilot data is added thereto. The pilot data may be added to each modulated symbol, thereby increasing significantly the density of pilot information available at the receiver for channel state estimation. When pilot data is added across an entire transmitted block of data, data detection performance is improved for even fast fading Rayleigh fading channels.

摘要翻译： 导频数据和数据载体数据被形成为彼此相互正交并且彼此的零空间。 要发送的数据首先用数据承载矩阵调制，然后将导频数据加到其上。 可以将导频数据添加到每个调制符号，从而显着增加在接收机处可用于信道状态估计的导频信息的密度。 当在整个发送的数据块上添加导频数据时，即使快速衰落的瑞利衰落信道也能提高数据检测性能。

公开(公告)号：US06377812B1

公开(公告)日：2002-04-23

申请号：US09196226

申请日：1998-11-20

申请人： Farrokh Rashid-Farrokhi ,  K. J. Ray Liu ,  Leandros Tassiulas

发明人： Farrokh Rashid-Farrokhi ,  K. J. Ray Liu ,  Leandros Tassiulas

IPC分类号： H04Q720

CPC分类号： H04W52/42 ,  H04B7/086 ,  H04W52/24

摘要： In a mobile cellular communications system power control and space-time diversity are applied in combination to the uplink and downlink. In the uplink, mobile powers and equalization/diversity combining vectors at base stations are, calculated jointly, with the result that the mobile transmitted power is minimized, while the Signal to Noise Ratio (SNR) at each link is maintained above a threshold. In the downlink, a multitap transmit diversity strategy adjusts the transmit weight vectors with the result that the SNR at each mobile is set to a specified value. The combination of power control and space-time diversity apply to networks with fading channels, including networks in which the number of cochannels and multipaths are larger than the number of antenna elements. The invention achieves the optimal solution for the uplink that minimizes the mobile power, and achieves a feasible solution for the downlink if there exists any.

摘要翻译： 在移动蜂窝通信系统中，功率控制和时空分集组合应用于上行链路和下行链路。 在上行链路中，在基站处的移动功率和均衡/分集组合向量被联合计算，结果是移动发射功率被最小化，而每个链路上的信噪比（SNR）被保持在阈值以上。 在下行链路中，多重发射分集策略调整发射权重向量，结果是将每个移动台处的SNR设置为指定值。 功率控制和时空分集的组合适用于具有衰落信道的网络，包括其中多个同步信道和多路径数量大于天线单元数量的网络。 本发明实现了使移动电力最小化的上行链路的最优解，并且如果存在任何一个，则为下行链路实现可行的解决方案。

公开(公告)号：US5953388A

公开(公告)日：1999-09-14

申请号：US912838

申请日：1997-08-18

申请人： David Francis Walnut ,  Carlos Alberto Berenstein ,  K. J. Ray Liu ,  Farrokh Rashid-Farrokhi

发明人： David Francis Walnut ,  Carlos Alberto Berenstein ,  K. J. Ray Liu ,  Farrokh Rashid-Farrokhi

IPC分类号： G06T11/00 ,  A61B6/03

CPC分类号： G06T11/006 ,  G06T2211/421 ,  Y10S378/901

摘要： An algorithm is created and applied to reconstruct the wavelet coefficients of an image from the Radon transform data for use in computed tomography, with a disclosed method that uses the properties of wavelets to localize the Radon transform such that a local region of the cross section of a body can be reconstructed using almost completely local data to significantly reduce the amount of exposure and computations in X-ray tomography. The described algorithm is based on the observation that for some wavelet bases with sufficiently many vanishing moments, the ramp-filtered version of the scaling function as well as the wavelet function has extremely rapid decay, with the variance of the elements of the nullspace is being negligible in the locally reconstructed image.

摘要翻译： 一种算法被创建并应用于从用于计算机断层摄影的Radon变换数据重建图像的小波系数，利用所公开的方法，使用小波的属性来定位Radon变换，使得横截面的局部区域 可以使用几乎完全的局部数据重建身体，以显着减少X射线层析成像中的暴露量和计算量。 所描述的算法基于对于具有足够多消失矩的一些小波基的观察，缩放函数的斜坡滤波版本以及小波函数具有非常快的衰减，空值空间的元素的方差正在 在本地重建的图像中可忽略不计。