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1. 发明授权

US10063396B2 Method and apparatus of topological pilot decontamination for massive MIMO systems 有权
公开(公告)号：US10063396B2
公开(公告)日：2018-08-28
申请号：US15016283
申请日：2016-02-05
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yaming Luo , Yuxian Zhang , Man Wai Kwan , Kong Chau Tsang
IPC分类号： H04L25/02 , H04B7/0456
CPC分类号： H04L25/0256 , H04B7/0413 , H04B7/0456 , H04L25/0204 , H04L25/0228 , H04L25/0242
摘要： The presently claimed invention relates generally to a method and an apparatus for pilot decontamination for massive MIMO system and, more particularly, to a massive MIMO communication system based on channel estimation with topological interference alignment.

2. 发明授权

US09401824B1 Method and apparatus of channel estimation in multi-user massive MIMO systems 有权
标题翻译：多用户大规模MIMO系统中信道估计的方法和装置
公开(公告)号：US09401824B1
公开(公告)日：2016-07-26
申请号：US14864847
申请日：2015-09-24
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
IPC分类号： H04L1/02 , H04L25/02 , H04B7/04 , H04L5/00
CPC分类号： H04L25/0204 , H04B7/0417 , H04B7/063 , H04B7/0695 , H04L5/0048 , H04L25/021 , H04L25/0226
摘要： The presently claimed invention provides a method of channel estimation in a multi-user massive Multiple-Input Multiple-Output system. Candidate pilots are selected for each user equipment based on their spatial correlation matrices. Through determining the similarity of spatial correlation matrices among different user equipments, shared pilots among them can be found, and a base station can transmit a union set of pilots for channel estimation. The present invention is able to provide high channel estimation accuracy and reduce training signal resource.
摘要翻译：本发明提供一种在多用户海量多输入多输出系统中的信道估计方法。基于其空间相关矩阵为每个用户设备选择候选导频。通过确定不同用户设备之间的空间相关矩阵的相似度，可以发现它们之间的共享导频，并且基站可以发送用于信道估计的导频组合。本发明能够提供高信道估计精度并减少训练信号资源。

3. 发明授权

US10044420B2 Closed-loop massive MIMO system architecture 有权
公开(公告)号：US10044420B2
公开(公告)日：2018-08-07
申请号：US15379635
申请日：2016-12-15
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
IPC分类号： H04B7/0417 , H04B7/0456 , H04W72/04 , H04B7/0452 , H04W72/08
CPC分类号： H04B7/0417 , H04B7/0452 , H04B7/0469 , H04B7/0473 , H04B7/0626 , H04B7/10 , H04W72/046 , H04W72/082
摘要： A method for transmitting payload data from a base station (BS) to a user equipment (UE) via a MIMO channel is provided. Channel estimation is performed first and the channel-estimation result is used for optimizing data transmission. Instead of reporting CQI, RI and PMI to the BS, the UE reports a first channel transfer function characterizing an end-to-end process of obtaining received CSI-RS symbols from originally-sent CSI-RS symbols. Computation burden at the UE is reduced as computation of the CQI, RI and PMI is eliminated. At the BS, an effect caused by the antenna port-to-transceiver unit (AP-to-TXRU) virtualization operation is removed from the first channel transfer function to yield a second channel transfer function. With the second channel transfer function closer to the MIMO channel transfer function than the first one, the “content” of the MIMO channel is better utilized in optimizing data-transmission performance.

4. 发明授权

US09722758B2 Channel-quality estimation for a wireless channel 有权
公开(公告)号：US09722758B2
公开(公告)日：2017-08-01
申请号：US14716887
申请日：2015-05-20
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Jiewei Ding , Man Wai Kwan , Jihui Zhang , Kong Chau Tsang
IPC分类号： H04B17/336 , H04W72/04 , H04W72/08 , H04L5/00
CPC分类号： H04L5/0057 , H04L5/0044
摘要： This invention provides a method for a first communication device, such as a base station, to estimate a channel-quality profile of a channel when a second communication device, e.g., a user equipment, returns only channel-quality indicators (CQIs) of selected subbands and a wideband CQI. The profile is obtained by including, for any two neighboring frequencies of the selected subbands, an estimated CQI of a middle frequency between the two neighboring frequencies. After translating the CQIs of the two neighboring frequencies into corresponding linear CQI values, a linear estimated-CQI value for the middle frequency is determined by subtracting an offset from an average of said corresponding linear CQI values. The offset is determined according to a frequency separation between the two neighboring frequencies. Preferably, the offset is linearly proportional to the frequency separation. Interpolation, preferably linear interpolation, is used to obtain linear CQI values of other frequencies.

5. 发明授权

US08831150B1 Method and apparatus for detecting a preamble in a received signal 有权
标题翻译：用于检测接收信号中的前导码的方法和装置
公开(公告)号：US08831150B1
公开(公告)日：2014-09-09
申请号：US13935568
申请日：2013-07-05
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Jun Xu , Man Wai Kwan , Honglei Zhang , Peng Li , Kong Chau Tsang
IPC分类号： H04L27/06 , H04B1/10 , H04L25/03 , H04L1/00
CPC分类号： H04L27/2663 , H04L27/2656
摘要： This invention discloses a method and an apparatus for reducing false alarm rate in preamble detection due to discontinuities between successive symbols in a received signal. The invention is usable in, e.g., a LTE compliant system. In one embodiment, the apparatus includes a filter for filtering the received signal to yield a filtered signal, and a correlator for correlating the filtered signal with a predetermined preamble. The apparatus further comprises a first multiplier for modifying the received signal before it is filtered, or a second multiplier for modifying the filtered signal before it is correlated, or both. The first multiplier multiplies the received signal with a first time-domain window function configured to substantially smooth discontinuities at symbol boundaries in the received signal. The second multiplier multiplies the filtered signal with a second time-domain window function configured to substantially suppress spikes present in the filtered signal around the symbol boundaries.
摘要翻译：本发明公开了一种在接收信号中由于连续符号之间的不连续性而减少前导码检测中的误报率的方法和装置。本发明可用于例如LTE兼容系统。在一个实施例中，该装置包括用于对接收到的信号进行滤波以产生经滤波的信号的滤波器，以及用于将经滤波的信号与预定前同步码进行相关的相关器。该装置还包括用于在接收信号被滤波之前修改接收信号的第一乘法器或用于在滤波信号相关之前修改滤波信号的第二乘法器，或两者。第一乘法器将接收到的信号与被配置为基本上平滑接收信号中符号边界处的不连续性的第一时域窗函数相乘。第二乘法器将经滤波的信号与被配置为基本上抑制存在于符号边界周围的滤波信号中的尖峰的第二时域窗函数相乘。

6. 发明授权

US11348277B2 Apparatus and method for estimating camera orientation relative to ground surface 有权
公开(公告)号：US11348277B2
公开(公告)日：2022-05-31
申请号：US16992088
申请日：2020-08-12
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Wang Kit Wilson Thong , Jihui Zhang , Man Wai Kwan , Yiu Man Lam , Cheng Hsiung Liu , Jiaxin Yan , Zhuobin Lin
IPC分类号： G06T7/73 , G06T1/00 , B60R1/00
摘要： A method for estimating camera orientation relative to a ground surface. Line segments are detected from an image captured by a camera. A first virtual cube having three orthogonal vanishing points with a random 3D orientation is superimposed on to the image. The line segments of the image are classified grouped into 3D-directional groups. A second virtual cube is superimposed on to the image with an initial 3D orientation. An optimal 3D orientation of the second virtual cube is computed by iteratively changing the 3D orientation of the second virtual cube and measuring perpendicular distances of the three orthogonal vanishing points to the three line segment groups in each iteration starting with the initial 3D orientation, wherein the optimal 3D orientation of the second virtual cube being one that provides shortest perpendicular distances. Co-variances of the orthogonal vanishing points of the second virtual cube at the optimal orientation are computed. Ground orientation is computed from the second virtual cube at the optimal orientation.

7. 发明授权

US11004212B1 Object tracking method and system using iterative template matching 有权
公开(公告)号：US11004212B1
公开(公告)日：2021-05-11
申请号：US16733063
申请日：2020-01-02
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Cheng Hsiung Liu , Wang Kit Wilson Thong , Man Wai Kwan , Zijian Xu , Yiu Man Lam , Jihui Zhang , Jiaxin Yan
IPC分类号： G06K9/00 , G06T7/207 , G06K9/62 , G06K9/36
摘要： A method and system for tracking a position and orientation of a target object that moves along a two-dimensional plane, a camera to generate video frames of the target object, and a processor configured to correct perspective scaling of a current one of the video frames; estimate a current location and angle of the target object using a motion model or its previous location/angle; cut out a region of interest from the current video frame around the estimated current location; resize the region of interest to shrink its size by a predetermined ratio M (width=width/M, height=height/M) or equivalently reducing the image resolution of the region of interest by the ratio M (resolution=resolution/M); track a new location of the target object by template matching the current region of interest with a previously stored template; and either conclude the tracked target object location and angle are accurate and updating the template if a stopping criterion is reached with indication of successful tracking, or proceed with a refinement method to refine the tracked location and angle until the stopping criterion is eventually reached.

8. 发明授权

US09648539B1 Base station selection in ultra dense network handover scenarios 有权
公开(公告)号：US09648539B1
公开(公告)日：2017-05-09
申请号：US15059319
申请日：2016-03-03
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yun Hou , Man Wai Kwan , Eddy Chiu , Kong Chau Tsang
IPC分类号： H04W36/00 , H04W36/30 , H04W36/08 , H04W72/04 , H04W36/04 , H04W36/32 , H04W84/04
CPC分类号： H04W36/30 , H04W36/0061 , H04W36/0083 , H04W36/04 , H04W36/08 , H04W36/32 , H04W84/042
摘要： For an ultra dense network (UDN) having small cells of highly overlapped coverages, a user equipment (UE) selects in a handover process a preferred base station (BS) from candidate BSs for minimizing occurrence of handover events. The UE computes finite differences consisting of a first-, a second-, and one or more higher-order differences, according to received signal strength (RSS) values obtained for each candidate BS. A preference level, which is a total number of finite differences having consecutive order numbers, including the first-order difference, and being positive or non-negative, is computed for each candidate BS. One or more favorable candidate BSs from the candidate BSs are identified such that the group of such favorable candidate BSs has the same preference level that is maximum among all the preference levels computed for the candidate BSs. The preferred BS is selected from the group of such favorable candidate BSs.

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