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    Wireless reception system and method for estimating channel effect thereof
    31.
    发明授权
    Wireless reception system and method for estimating channel effect thereof 有权
    无线接收系统及其信道效果估计方法

    公开(公告)号：US09054932B2

    公开(公告)日：2015-06-09

    申请号：US14140838

    申请日：2013-12-26

    申请人： MStar Semiconductor, Inc.

    发明人： Fong-Shih Wei ,  Yi-Ying Liao

    IPC分类号： H04K1/10 ,  H04L27/26 ,  H04L25/02

    CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/0232 ,  H04L27/2663 ,  H04L27/2695

    摘要： A wireless reception system includes a reception module, a preliminary estimation module, an equalization module and a selection module. The reception module receives a reference signal and at least one input signal transmitted via a multipath environment. The reference signal is associated with a known signal unaffected by the multipath environment. The preliminary estimation module generates a plurality of candidate channel effects according to the at least one input signal. The equalization module performs equalization on the reference signal according to the candidate channel effects to generate a plurality of equalization results. From the equalization results, the selection module selects an optimal equalization result that is most similar to the known signal, and selects the candidate channel effect corresponding to the optimal equalization result to represent the multipath environment.

    摘要翻译： 无线接收系统包括接收模块，初步估计模块，均衡模块和选择模块。 接收模块接收经由多路径环境发送的参考信号和至少一个输入信号。 参考信号与不受多路径环境影响的已知信号相关联。 初步估计模块根据至少一个输入信号产生多个候选信道效应。 均衡模块根据候选信道效应对参考信号执行均衡以产生多个均衡结果。 从均衡结果中，选择模块选择与已知信号最相似的最优均衡结果，并且选择与最佳均衡结果对应的候选信道效应来表示多路径环境。

    Method and systems for OFDM using code division multiplexing
    35.
    发明授权
    Method and systems for OFDM using code division multiplexing 有权
    使用码分复用的OFDM方法和系统

    公开(公告)号：US08976843B2

    公开(公告)日：2015-03-10

    申请号：US14079131

    申请日：2013-11-13

    申请人： Apple Inc.

    发明人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Zhu ,  Hang Zhang ,  Mo-Han Fong

    IPC分类号： H04B1/707 ,  H04J13/00 ,  H04B7/06 ,  H04L5/00 ,  H04L25/02 ,  H04L27/26 ,  H04J13/16 ,  H04L25/03

    CPC分类号： H04J13/0003 ,  H04B1/707 ,  H04B7/0404 ,  H04B7/0678 ,  H04J13/00 ,  H04J13/16 ,  H04L5/0016 ,  H04L5/0026 ,  H04L5/0048 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2627 ,  H04W72/044

    摘要： In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

    摘要翻译： 在本发明的一些实施例中，OFDM符号作为多个簇发送。 在多个OFDM符号持续时间内，群集包括频率上的多个OFDM子载波。 每个簇包括数据以及作为信道估计的参考信号的导频信息。 在一些实施例中，多个集群共同地占用用于传输的频域中的可用子载波集合。 在本发明的一些实施例中，使用码分多路复用（CDM）在每个簇内扩展数据和/或导频。 在一些实施例中，通过在OFDM码元持续时间的其余部分上分配关于多个OFDM符号持续时间的特定数目和导频上的数据来分离导频和数据。 可以在时间和/或频率方向上执行CDM扩展。

    User equipment and method for radio link monitoring
    37.
    发明授权
    User equipment and method for radio link monitoring 有权
    用于无线电链路监控的用户设备和方法

    公开(公告)号：US08934365B2

    公开(公告)日：2015-01-13

    申请号：US13542050

    申请日：2012-07-05

    申请人： Abdelkader Medles ,  Cyril Valadon

    发明人： Abdelkader Medles ,  Cyril Valadon

    IPC分类号： H04J1/16 ,  H04J3/14 ,  H04L1/00 ,  H04L12/56

    CPC分类号： H04L25/0232 ,  H04B17/309 ,  H04B17/327 ,  H04B17/336 ,  H04B17/345 ,  H04L5/0005

    摘要： Techniques are provided for a radio link quality monitoring method and apparatus wherein a given user equipment device receives a plurality of Orthogonal Frequency Division Multiplex symbols that comprise a plurality of resource elements distributed in time and frequency, and which include reference symbols. The objective of the radio link quality monitoring is to predict the user equipment detection probability of control messages transmitted by the base station. The radio link quality estimation process calculates two average signal to noise ratio values over the complete frequency bandwidth for two assumed control channel formats corresponding to in-sync and out-of-sync conditions. The results of the calculations are then used to deduce the average error probabilities that are compared with predefined thresholds to provide the in-sync/out-of-sync indications.

    摘要翻译： 提供了一种用于无线电链路质量监测方法和装置的技术，其中给定的用户设备设备接收包括在时间和频率上分布的并且包括参考符号的多个资源元素的多个正交频分复用符号。 无线电链路质量监测的目的是预测由基站发送的控制消息的用户设备检测概率。 无线链路质量估计过程针对对应于同步和不同步条件的两个假设的控制信道格式，在完整频率带宽上计算两个平均信噪比值。 然后使用计算结果推导出与预定义阈值进行比较以提供同步/失步指示的平均误差概率。

    Method and apparatus for channel estimation
    38.
    发明授权
    Method and apparatus for channel estimation 有权
    用于信道估计的方法和装置

    公开(公告)号：US08934330B2

    公开(公告)日：2015-01-13

    申请号：US13519577

    申请日：2009-12-29

    申请人： Ben Niu ,  Gang Liu ,  Li Zou

    发明人： Ben Niu ,  Gang Liu ,  Li Zou

    IPC分类号： H04J11/00 ,  H04L25/02 ,  H04L27/26

    CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0232

    摘要： The present invention provides a method for channel estimation used in a receiver of a multi-carrier communication system, including: receiving a multi-carrier symbols from a transmitter of the multi-carrier communication system; and obtaining channel information of sub-carriers carrying data of the multi-carrier symbols, using selectively time direction interpolation and frequency direction interpolation for channel information of a plurality of scatter pilots of the multi-carrier symbols.

    摘要翻译： 本发明提供一种用于多载波通信系统的接收机中的信道估计方法，包括：从多载波通信系统的发射机接收多载波符号; 以及使用多载波符号的多个散射导频的信道信息选择性地进行时间内插和频率方向插值来获得承载多载波符号数据的子载波的信道信息。

    Wireless communication apparatus using an estimate of the amount-of-phase rotation using pilot signals
    39.
    发明授权
    Wireless communication apparatus using an estimate of the amount-of-phase rotation using pilot signals 有权
    使用导频信号使用相位旋转量的估计的无线通信装置

    公开(公告)号：US08923227B2

    公开(公告)日：2014-12-30

    申请号：US13501804

    申请日：2010-10-26

    申请人： Eiji Mochida

    发明人： Eiji Mochida

    IPC分类号： H04W4/00 ,  H04L27/26 ,  H04B7/08 ,  H04L25/02 ,  H04W72/04 ,  H04L25/03

    CPC分类号： H04B7/0842 ,  H04B7/0854 ,  H04L25/0232 ,  H04L25/03019 ,  H04L27/265 ,  H04L27/2663 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03598 ,  H04W72/04

    摘要： A decrease in weight calculation accuracy in MMSE combining caused by a shift in the discrete Fourier transform timing of received signals is prevented. A wireless communication apparatus BS1 includes an MMSE combining processing unit 31 that performs MMSE combining based on frequency domain received signals obtained by performing a discrete Fourier transform on received signals. The wireless communication apparatus BS1 includes an amount-of-phase-rotation estimating unit 32 that estimates an amount of phase rotation occurring in the frequency domain received signals due to a shift in discrete Fourier transform timing of the received signals; and reverse rotation units 33a and 33b that apply a reverse rotation of an amount of rotation corresponding to the amount of phase rotation estimated by the amount-of-phase-rotation estimating unit 32, to the frequency domain received signals. The MMSE combining processing unit 31 computes an MMSE weight based on the frequency domain received signals to which the reverse rotation has been applied by the reverse rotation units 33a and 33b, and performs MMSE combining.

    摘要翻译： 防止由接收信号的离散傅里叶变换定时的移位导致的MMSE组合中的权重计算精度的降低。 无线通信装置BS1包括MMSE组合处理单元31，MMSE组合处理单元31基于通过对接收到的信号执行离散付里叶变换获得的频域接收信号进行MMSE组合。 无线通信装置BS1包括：相位旋转估计部32，估计由于接收信号的离散傅里叶变换定时的移位而产生的频域接收信号中的相位旋转量; 以及将与由相位旋转估计单元32估计的相位旋转相对应的旋转量的反转的反转单元33a和33b用于频域接收信号。 MMSE组合处理单元31基于由反转单元33a和33b施加了反向旋转的频域接收信号来计算MMSE权重，并执行MMSE组合。

    Technique for channel estimation in the presence of a signal phase discontinuity
    40.
    发明授权
    Technique for channel estimation in the presence of a signal phase discontinuity 有权
    在存在信号相位不连续的情况下进行信道估计的技术

    公开(公告)号：US08908555B2

    公开(公告)日：2014-12-09

    申请号：US13823501

    申请日：2010-09-27

    申请人： Rainer Bachl ,  Stefan Mueller-Weinfurtner

    发明人： Rainer Bachl ,  Stefan Mueller-Weinfurtner

    IPC分类号： H04B1/06 ,  H04W52/02 ,  H04L25/02 ,  H04L27/26

    CPC分类号： H04W52/0209 ,  H04L25/0202 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2647 ,  H04W52/0229 ,  Y02D70/1262

    摘要： A technique for performing channel estimation based on a received signal comprising a first signal part and a second signal part in the presence of an unknown phase discontinuity between the first signal part and the second signal part is presented. A method implementation of this technique comprises providing a first channel parameter that is based on the first signal part, determining a second channel parameter based on the second signal part, estimating the phase discontinuity from the first channel parameter and the second channel parameter, updating the first channel parameter based on the estimated phase discontinuity, and determining a channel estimate based on the second signal part including performing channel estimation filtering using the updated first channel parameter as filter state information.

    摘要翻译： 提出了一种在第一信号部分和第二信号部分之间存在未知相位不连续的情况下，基于包括第一信号部分和第二信号部分的接收信号执行信道估计的技术。 该技术的方法实现包括提供基于第一信号部分的第一信道参数，基于第二信号部分确定第二信道参数，从第一信道参数和第二信道参数估计相位不连续性，更新 基于估计的相位不连续性的第一信道参数，以及基于包括使用更新的第一信道参数进行信道估计滤波的第二信号部分来确定信道估计作为过滤状态信息。