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11.发明公开公开(公告)号：US20240121747A1
公开(公告)日：2024-04-11
申请号：US17960271
申请日：2022-10-05
Inventor： Zhen Chen , Haiming Zhang , Ho Yin Chan , Yuxian Zhang
IPC: H04W64/00
CPC classification number: H04W64/00
Abstract: Described is a method of determining a position of a mobile wireless device in a wireless communication network. The method comprises, for a plurality of clusters of transmission reception points (TRPs) associated with said mobile wireless device, measuring a parameter of first reference signals transmitted between said mobile wireless device and a single TRP from each cluster of TRPs. The method includes, based on the respective measured parameter of the first reference signals, selecting one cluster of TRPs from said plurality of clusters of TRPs. Position estimation information is determined from second reference signals transmitted between said mobile wireless device and a plurality of the TRPs comprising the selected cluster of TRPs. The determined position estimation information is used to determine a position for said mobile wireless device.
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公开(公告)号：US10367594B2
公开(公告)日：2019-07-30
申请号：US15616002
申请日：2017-06-07
Inventor： Ho Yin Chan , Chang Li , Man Wai Kwan , Yuxian Zhang , Kong Chau Tsang
Abstract: Provided is a method of determining timing of arrival of a signal on a path to a receiver in a mobile wireless communications system. The method comprises obtaining a channel impulse response (CIR) of a signal received at the receiver and deriving a power characteristic of the CIR. The method includes producing a first derivative of the power characteristic with respect to time, selecting some or all extrema from the first derivative of the power characteristic as indicative of candidate signal paths, and selecting one or more of said candidate signal paths. The method preferably includes determining timing of arrival of a signal on a first path of arrival at the receiver by assessing an energy value of each of said candidate signal paths against a threshold value.
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13.发明申请公开(公告)号：US20160226696A1
公开(公告)日：2016-08-04
申请号：US14614157
申请日：2015-02-04
Inventor： Yuxian Zhang , Honglei Zhang , Victor Kwan , Eric Tsang
IPC: H04L27/26
CPC classification number: H04L27/2663 , H04L27/2659 , H04L27/2675 , H04L27/2685
Abstract: A method for performing high speed mode detection of a carrier frequency offset (CFO) includes receiving a Zadoff-Chu signal at a wireless device, and determining a plurality of correlation peaks based on a correlation of the signal with one or more known Zadoff-Chu sequences. The method includes determining a carrier frequency offset (CFO) associated with the signal based on a phases associated with the plurality of correlation peaks and a coarse CFO estimate. The coarse CFO estimate may be determined based on a squared power ratio of particular pairs of the plurality of correlation peaks and the phases may be used to remove ambiguity associated with the coarse CFO estimate.
Abstract translation: 用于执行载波频率偏移（CFO）的高速模式检测的方法包括在无线设备处接收Zadoff-Chu信号，并且基于所述信号与一个或多个已知的Zadoff-Chu的相关性来确定多个相关峰值 序列。 该方法包括基于与多个相关峰值相关联的相位和粗略的CFO估计来确定与该信号相关联的载波频率偏移（CFO）。 可以基于多个相关峰的特定对的平方功率比来确定粗略的CFO估计，并且可以使用相位来消除与粗略CFO估计相关联的模糊度。
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14.发明授权公开(公告)号：US09237513B2
公开(公告)日：2016-01-12
申请号：US14304781
申请日：2014-06-13
Inventor： Yin Yang , Jiewei Ding , Yuxian Zhang , Honglei Zhang , Kong Chau Tsang
CPC classification number: H04W48/16 , G06F17/14 , H04B7/0626 , H04B7/0842 , H04J11/005 , H04J11/0069 , H04W24/02 , H04W24/10
Abstract: A methods for performing a cell search in multiple antenna wireless systems using a plurality of spatial filters is disclosed, and includes applying a plurality of spatial filters to a plurality of received signal streams to generate a plurality of filtered signal streams. The plurality of received signal streams correspond to signals received at a plurality of receive antennas from a plurality of signal sources (e.g., neighboring cells). In an aspect, the plurality of spatial filters may be predefined spatial filters and may be weighted using a set of predefined filter weights. In an additional or alternative aspect, the plurality of spatial filters may be adaptive spatial filters and may be weighted using a set of dynamically determined filter weights. The method includes detecting physical network identities based on the plurality of filtered signal streams.
Abstract translation: 公开了一种使用多个空间滤波器在多个天线无线系统中执行小区搜索的方法，并且包括将多个空间滤波器应用于多个接收信号流以产生多个经滤波的信号流。 多个接收信号流对应于从多个信号源（例如，相邻小区）在多个接收天线处接收的信号。 在一个方面，多个空间滤波器可以是预定义的空间滤波器，并且可以使用一组预定义的滤波器权重进行加权。 在附加或替代方面，多个空间滤波器可以是自适应空间滤波器，并且可以使用一组动态确定的滤波器权重来加权。 该方法包括基于多个经滤波的信号流检测物理网络身份。
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15.发明授权公开(公告)号：US10484158B2
公开(公告)日：2019-11-19
申请号：US15413662
申请日：2017-01-24
Inventor： Jia Ni , Yuxian Zhang , Man Wai Victor Kwan , Eric Kong Chau Tsang
Abstract: Provided is a method and an apparatus for signaling allocation of resources in a joint transmission communication system. The method includes determining one of a plurality of resource allocation schemes to be implemented by two or more of a plurality of transmission points (TPs) comprising a set of coordinated TPs for enabling said two or more of said TPs to transmit data to a scheduled user equipment (UE). The method may comprise determining a bit length of a resource allocation field for a resource allocation signal message based on a number N of resource blocks groups (RBGs) related to a bandwidth of the joint transmission communication system and a number M of TPs comprising said set of coordinated TPs and further include formatting the resource allocation signal message to provide the resource allocation field based on said determined bit length. The resource allocation signal message is transmitted from only one of said set of coordinated TPs to said scheduled UE.
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Patent Agency Ranking
公开(公告)号：US10448432B1
公开(公告)日：2019-10-15
申请号：US16005306
申请日：2018-06-11
Inventor： Yijing Chu , Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
Abstract: Systems and methods which provide for detection of a signal using resource elements in the frequency domain where the signal for which detection is provided is multiplexed with other signals having subcarrier spacing that is different than the signal for which detection is provided are disclosed. Embodiments may provide for detection of a physical random access channel (PRACH) signal in a cellular radio communication system using resource elements in the frequency domain, wherein the PRACH signal is multiplexed with signals of other channels (e.g., data and/or control channel signals) of the cellular radio communication system. A frequency domain filter, such as implementing inverse discrete Fourier transform (IDFT) with down-sampling using indices for PRACH recovery, may be utilized to extract PRACH samples from frequency domain resource elements provided in a resource grid corresponding to a different subcarrier spacing than that of the PRACH.
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公开(公告)号：US10334516B1
公开(公告)日：2019-06-25
申请号：US15920026
申请日：2018-03-13
Inventor： Zhonghui Zhang , Xiangyu Liu , Yuxian Zhang , Man Wai Kwan , Kong Chau Tsang
IPC: H04W48/16 , H04B17/318 , H04W56/00
Abstract: The present disclosure relates to methods, devices, and systems for cell identification. For example, the systems, devices, and methods described herein may be used to detecting a secondary synchronization signal (SSS) index. In an aspect of the present disclosure, a method includes detecting, at an electronic device, a first SSS index based on a comparison between a first power value and a first threshold. The first power value is associated with a correlation power result between a received signal from a base station and a local SSS. The method also include determining, at the electronic device, a second threshold based on the first power value, and performing a comparison between a second power value and the second threshold. The second power value is determined based on the received signal.
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18.发明授权公开(公告)号：US10277296B2
公开(公告)日：2019-04-30
申请号：US15434115
申请日：2017-02-16
Inventor： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
Abstract: Provided is a method of base station (BS) for channel state information (CSI) acquisition in a massive multiple input/multiple output (MIMO) communication system. The method comprises the steps at the BS of sending a set of beamformed reference signals (RSs) to a user equipment (UE) and receiving from said UE an indication of a subset of said set of beamformed RSs and CSI acquired by said UE for only said subset of said set of beamformed RSs. Also provided is a further method and a user equipment (UE) for CSI acquisition. The further method comprises the steps at the UE of receiving from the BS the set of beamformed RSs; estimating a channel of each RS comprising said set of beamformed RSs; selecting a subset of said set of beamformed RSs; acquiring CSI for only said selected subset of said set of beamformed RSs; and communicating to said BS an indication of said selected subset of said set of beamformed RSs and reporting the CSI acquired for said selected subset of said set of beamformed RSs.
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公开(公告)号：US20180359043A1
公开(公告)日：2018-12-13
申请号：US15616002
申请日：2017-06-07
Inventor： Ho Yin Chan , Chang Li , Man Wai Kwan , Yuxian Zhang , Kong Chau Tsang
CPC classification number: H04J11/0036 , H04L25/0204 , H04L25/0212
Abstract: Provided is a method of determining timing of arrival of a signal on a path to a receiver in a mobile wireless communications system. The method comprises obtaining a channel impulse response (CIR) of a signal received at the receiver and deriving a power characteristic of the CIR. The method includes producing a first derivative of the power characteristic with respect to time, selecting some or all extrema from the first derivative of the power characteristic as indicative of candidate signal paths, and selecting one or more of said candidate signal paths. The method preferably includes determining timing of arrival of a signal on a first path of arrival at the receiver by assessing an energy value of each of said candidate signal paths against a threshold value.
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公开(公告)号：US09491024B2
公开(公告)日：2016-11-08
申请号：US14614157
申请日：2015-02-04
Inventor： Yuxian Zhang , Honglei Zhang , Victor Kwan , Eric Tsang
IPC: H04L27/26
CPC classification number: H04L27/2663 , H04L27/2659 , H04L27/2675 , H04L27/2685
Abstract: A method for performing high speed mode detection of a carrier frequency offset (CFO) includes receiving a Zadoff-Chu signal at a wireless device, and determining a plurality of correlation peaks based on a correlation of the signal with one or more known Zadoff-Chu sequences. The method includes determining a carrier frequency offset (CFO) associated with the signal based on a phases associated with the plurality of correlation peaks and a coarse CFO estimate. The coarse CFO estimate may be determined based on a squared power ratio of particular pairs of the plurality of correlation peaks and the phases may be used to remove ambiguity associated with the coarse CFO estimate.
Abstract translation: 用于执行载波频率偏移（CFO）的高速模式检测的方法包括在无线设备处接收Zadoff-Chu信号，并且基于所述信号与一个或多个已知的Zadoff-Chu的相关性来确定多个相关峰值 序列。 该方法包括基于与多个相关峰值相关联的相位和粗略的CFO估计来确定与该信号相关联的载波频率偏移（CFO）。 可以基于多个相关峰的特定对的平方功率比来确定粗略的CFO估计，并且可以使用相位来消除与粗略CFO估计相关联的模糊度。
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