-
1.发明公开公开(公告)号：US20240259248A1
公开(公告)日：2024-08-01
申请号：US18102323
申请日：2023-01-27
Inventor： Zhonghui Zhang , Yuxian Zhang , Yibing Yao
CPC classification number: H04L27/2666 , H04L25/0224 , H04L27/0014 , H04L27/2675 , H04L2027/0026
Abstract: Described is a method of performing carrier frequency offset (CFO) estimation of physical channels in a mobile communications system. The method comprises the step of performing channel estimation of a received signal on a physical channel based on multiple orthogonal frequency division multiplex (OFDM) symbols in one or more reference signals (RSs). The method includes determining multiple phase rotation values Φ and corresponding time differences s between different OFDM symbols in the one or more RSs over a base phase rotation range comprising +/−π to obtain a first CFO estimation candidate f0. The base phase rotation range is extended to provide an extended phase rotation range of greater than +/−π to obtain additional CFO estimation candidates f1, f2 . . . fn within the extended phase rotation range.
-
公开(公告)号：US11575189B1
公开(公告)日：2023-02-07
申请号：US17482831
申请日：2021-09-23
Inventor： Xiaolong Huang , Yujiang Wu , Yuxian Zhang , Eric Kong Chau Tsang
Abstract: Described is a bandpass filter comprising a multi-layered body, a first resonator conductor formed on a first layer of the body and a second resonator conductor formed on a second, tower layer of the body. The first resonator conductor and the second resonator conductor comprise a first coupling area formed by only a partial overlap of the first resonator conductor and the second resonator conductor. A length of each said resonator conductor is in the range of λg/3 to λg/5, where λg. is a center wavelength of the bandpass filter passband.
-
公开(公告)号：US11197279B1
公开(公告)日：2021-12-07
申请号：US16922150
申请日：2020-07-07
Inventor： Kanghao Jia , Yuxian Zhang , Man Wai Kwan , Kong Chau Tsang
Abstract: Described is a method and apparatus for processing an uplink (UL) signal at a Physical Uplink Control Channel (PUCCH) in a wireless communication system to determine a discontinuous transmission (DTX) state. The method comprises receiving a UL channel signal at a PUCCH receiver apparatus and, after resource element (RE) demapping of said received UL channel signal in said PUCCH receiver apparatus, normalizing a signal power of at least one signal element or resource. The normalized power is compared to a selected, calculated or predetermined threshold and, based on said comparison, a determination is made on whether or not a DTX state has occurred.
-
4.发明申请公开(公告)号：US20200235864A1
公开(公告)日：2020-07-23
申请号：US16254964
申请日：2019-01-23
Inventor： Nan Li , Xiangyu Liu , Yuxian Zhang , Man Wai Kwan , Ho Yin Chan , Kong Chau Tsang
Abstract: Provided is a method for determining a Hybrid Automatic Repeat Request (HARQ) transmission signal. The method comprises receiving soft bits from a wireless communication physical channel uplink signal, said received soft bits being deemed to comprise HARQ LLRs and soft decoding said HARQ LLRs to output a hard ACK/NACK decision. The method includes processing said HARQ LLRs based on said hard ACK/NACK decision such that the processed HARQ LLRs map to a same or identical constellation point or points if the physical channel uplink signal contains an ACK or NACK transmission signal. The method also includes using said processed HARQ LLRs to determine if the physical channel uplink signal contains an ACK or NACK transmission signal or to determine if the physical channel uplink signal comprises discontinuous transmission (DTX).
-
公开(公告)号：US10348384B1
公开(公告)日：2019-07-09
申请号：US15904325
申请日：2018-02-24
Inventor： Jia Ni , Yuxian Zhang , Mai Wai Kwan , Kong Chau Tsang
IPC: H04B7/06 , H04B7/0456 , G06F17/14
Abstract: Provided is a method of determining Channel State Information (CSI) in a multiple input/multiple output (MIMO) wireless communication system. The CSI may comprise a Precoding Matrix Indicator (PMI) and/or a Rank Indicator (RI). The method comprises, for a matrix of channels comprising a link between a gNodeB (gNB) and a user equipment (UE), determining correlation values between all Discrete Fourier Transform (DFT) vectors and the observations from the channel matrix. The DFT vectors may include the horizontal vector direction and the vertical vector direction. The method includes selecting those DFT vectors in one or more selected vector directions having a correlation value greater than a predefined threshold to thereby identify a subset of all DFT vectors and determining said CSI from the selected subset of DFT vectors.
-
Patent Agency Ranking
6.发明申请公开(公告)号：US20180213515A1
公开(公告)日：2018-07-26
申请号：US15413662
申请日：2017-01-24
Inventor： Jia Ni , Yuxian Zhang , Man Wai Victor Kwan , Eric Kong Chau Tsang
CPC classification number: H04L5/0053 , H04L5/003 , H04L5/0035 , H04L5/005 , H04W72/042
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.
-
公开(公告)号：US11057159B2
公开(公告)日：2021-07-06
申请号：US16254964
申请日：2019-01-23
Inventor： Nan Li , Xiangyu Liu , Yuxian Zhang , Man Wai Kwan , Ho Yin Chan , Kong Chau Tsang
Abstract: Provided is a method for determining a Hybrid Automatic Repeat Request (HARQ) transmission signal. The method comprises receiving soft bits from a wireless communication physical channel uplink signal, said received soft bits being deemed to comprise HARQ LLRs and soft decoding said HARQ LLRs to output a hard ACK/NACK decision. The method includes processing said HARQ LLRs based on said hard ACK/NACK decision such that the processed HARQ LLRs map to a same or identical constellation point or points if the physical channel uplink signal contains an ACK or NACK transmission signal. The method also includes using said processed HARQ LLRs to determine if the physical channel uplink signal contains an ACK or NACK transmission signal or to determine if the physical channel uplink signal comprises discontinuous transmission (DTX).
-
8.发明申请公开(公告)号：US20180234149A1
公开(公告)日：2018-08-16
申请号：US15434115
申请日：2017-02-16
Inventor： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
IPC: H04B7/06 , H04L5/00 , H04B7/0413
CPC classification number: H04B7/0617 , H04B7/0413 , H04B7/0626 , H04B7/0632 , H04B7/0695 , H04L5/0048
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.
-
9.发明申请公开(公告)号：US20150365882A1
公开(公告)日：2015-12-17
申请号：US14304781
申请日：2014-06-13
Inventor： Yin Yang , Jiewei Ding , Yuxian Zhang , Honglei Zhang , Kong Chau Tsang
IPC: H04W48/16
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: 公开了一种用于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生成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。
-
公开(公告)号：US20250125832A1
公开(公告)日：2025-04-17
申请号：US18484809
申请日：2023-10-11
Inventor： Hong Hu , Jianping Zheng , Xiangyu Liu , Yuxian Zhang
Abstract: A method of estimating local oscillator leakage (LOL) for a radio frequency (RF) signal transmitter. The method comprises generating a transmitter wideband baseband signal (s(t)) with a direct current (DC) voltage element of the transmitter wideband baseband signal (s(t)) removed or blocked and an average of the transmitter wideband baseband signal (s(t)) set to zero. The method includes processing said transmitter wideband baseband signal (s(t)) to form a RF signal; processing the RF signal to obtain a receiver baseband signal (y(t)); and determining a magnitude of an average of the receiver baseband signal (y(t)) as comprising a magnitude of the transmitter DC offset.
-
-
-
-
-
-
-
-
-
Search Results
20
records
(took 0.021 seconds)
