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    Sample selection for secondary synchronization signal (SSS) detection
    1.
    发明授权
    Sample selection for secondary synchronization signal (SSS) detection 有权

    公开(公告)号：US09820245B2

    公开(公告)日：2017-11-14

    申请号：US14181953

    申请日：2014-02-17

    Applicant: QUALCOMM Incorporated

    Inventor： Tao Luo ,  Kapil Bhattad ,  Xiaoxia Zhang ,  Taesang Yoo ,  Xiliang Luo ,  Ke Liu

    IPC: H04W72/04 ,  H04W56/00 ,  H04J11/00 ,  H04W24/02

    CPC classification number: H04W56/001 ,  H04J11/005 ,  H04J11/0069 ,  H04J11/0093 ,  H04W24/02 ,  H04W72/042

    Abstract: Methods and apparatus for selecting samples for secondary synchronization signal (SSS) detection are described. Several alternatives are provided for efficient cell identifier detection. In a first alternative, multiple bursts of a signal received from a cell are sampled with non-uniform spacing between sampling intervals to determine a sequence for cell identification. In a second alternative, samples of a first and a second signal received from a stronger cell are cancelled, and a sequence for detecting a weaker cell is determined by reducing effects of the samples of a third signal received from the weaker cell which do not overlap with the primary synchronization signal (PSS) or SSS of the stronger cell. In a third alternative, a sequence for detecting a weaker cell is determined by reducing effects of any sampled bursts that correspond to a high transmission power portion of a signal from a stronger cell.

    Method and apparatus for selecting reference signal tones for decoding a channel
    5.
    发明授权
    Method and apparatus for selecting reference signal tones for decoding a channel 有权
    用于选择用于解码频道的参考信号音的方法和装置

    公开(公告)号：US09497645B2

    公开(公告)日：2016-11-15

    申请号：US13895215

    申请日：2013-05-15

    Applicant: QUALCOMM Incorporated

    Inventor： Kapil Bhattad ,  Ke Liu ,  Tao Luo ,  Yongbin Wei

    IPC: H03H7/30 ,  H04W4/00 ,  H04W24/02 ,  H04L27/26 ,  H04L5/00 ,  H03G1/02 ,  H04L25/02 ,  H04W84/04

    CPC classification number: H04W24/02 ,  H03G1/02 ,  H04L5/0053 ,  H04L25/0202 ,  H04L27/2601 ,  H04W84/045

    Abstract: Methods and apparatuses are provided that include selecting reference signal (RS) or other tones to utilize in estimating a channel for decoding one or more channels. Where the RS tones are interfered by other base stations, interference cancelation can be performed over the RS tones. Since interference can vary over the tones, interference cancelation can yield RS tones of varying quality. Thus, a quality of each of the RS tones can be determined, and at least a subset of the RS tones can be selected for estimating a channel. Additionally or alternatively, the RS tones can be weighted or otherwise classified for performing channel estimation using the RS tones.

    Abstract translation: 提供了包括选择参考信号（RS）或其他音调以用于估计用于解码一个或多个信道的信道的方法和装置。 在RS音调被其他基站干扰的情况下，可以通过RS音调进行干扰消除。 由于干扰可以在音调上变化，所以干扰消除可以产生质量不同的RS音调。 因此，可以确定每个RS音调的质量，并且可以选择RS音调的至少一个子集来估计频道。 附加地或替代地，可以对RS音调进行加权或分类，以便使用RS音调进行信道估计。

    Blind CRS detection
    6.
    发明授权
    Blind CRS detection 有权
    盲CRS检测

    公开(公告)号：US09240864B2

    公开(公告)日：2016-01-19

    申请号：US14191243

    申请日：2014-02-26

    Applicant: QUALCOMM Incorporated

    Inventor： Xiliang Luo ,  Wenshu Zhang ,  Keith William Saints ,  Ke Liu ,  Kapil Bhattad ,  Alexei Yurievitch Gorokhov

    IPC: H04L1/00 ,  H04L5/00 ,  H04L25/06 ,  H04L27/26 ,  H04L25/02

    CPC classification number: H04L1/0054 ,  H04L5/0023 ,  H04L5/005 ,  H04L25/0212 ,  H04L25/067 ,  H04L27/2656 ,  H04L27/2675

    Abstract: Certain aspects of the present disclosure relate to methods and apparatus for blind detection of cell-specific reference signals. Methods and apparatus are provided for detecting a cell-specific reference signal (CRS) in an orthogonal frequency division multiplexed (OFDM) symbol by a user equipment (UE). The method generally includes predicting a current channel response of a current OFDM symbol based on a channel response of at least one previous OFDM symbol, estimating a noise power level of the current OFDM symbol, forming a log likelihood ratio (LLR) of two detection hypotheses based on the predicted current channel response and the estimated noise power level, comparing the LLR to a pre-determined threshold, and determining that at least one CRS is present in the current OFDM symbol based on the comparison.

    Abstract translation: 本公开的某些方面涉及盲细胞特异性参考信号的盲检测方法和装置。 提供了用于由用户设备（UE）检测正交频分复用（OFDM）符号中的小区特定参考信号（CRS）的方法和装置。 该方法通常包括基于至少一个先前OFDM符号的信道响应来预测当前OFDM符号的当前信道响应，估计当前OFDM符号的噪声功率电平，形成两个检测假设的对数似然比（LLR） 基于预测的当前信道响应和估计的噪声功率电平，将LLR与预定阈值进行比较，并且基于该比较确定当前OFDM符号中存在至少一个CRS。

    PER-CELL TIMING AND/OR FREQUENCY ACQUISITION AND THEIR USE ON CHANNEL ESTIMATION IN WIRELESS NETWORKS
    7.
    发明申请
    PER-CELL TIMING AND/OR FREQUENCY ACQUISITION AND THEIR USE ON CHANNEL ESTIMATION IN WIRELESS NETWORKS 有权
    单元时间和/或频率采集及其在无线网络中的信道估计中的应用

    公开(公告)号：US20130231123A1

    公开(公告)日：2013-09-05

    申请号：US13865693

    申请日：2013-04-18

    Applicant: QUALCOMM INCORPORATED

    Inventor： Taesang Yoo ,  Tao Luo ,  Xiaoxia Zhang ,  Ke Liu

    IPC: H04W24/00

    CPC classification number: H04W24/00 ,  H04W56/00 ,  H04W56/0015 ,  H04W56/0035

    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in which a system timing is estimated, derived from timing of one or more cells, a timing offset is determined for a plurality of cells relative to the estimated system timing, and signals received form the plurality of cells are processed using the timing offsets. In addition, a method, an apparatus, and a computer program product for wireless communication are provided in which a carrier frequency is estimated, derived from a frequency of one or more cells, a frequency offset is determined for a plurality of cells relative to the estimated system timing, and signals received form the plurality of cells are processed using the frequency offsets.

    Abstract translation: 提供了一种用于无线通信的方法，装置和计算机程序产品，其中从一个或多个单元的定时导出系统定时，相对于估计的系统定时为多个单元确定定时偏移， 并且使用定时偏移来处理从多个单元接收的信号。 此外，提供了一种用于无线通信的方法，装置和计算机程序产品，其中从一个或多个单元的频率导出载波频率，相对于多个单元确定频率偏移 使用频率偏移来处理估计的系统定时和从多个小区接收的信号。

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