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    Method and receiver in a wireless communication system
    11.
    发明授权
    Method and receiver in a wireless communication system 有权
    无线通信系统中的方法和接收机

    公开(公告)号：US09083597B1

    公开(公告)日：2015-07-14

    申请号：US14553845

    申请日：2014-11-25

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Fredrik Rusek ,  Basuki Endah Priyanto

    IPC: H04L27/06 ,  H04L27/26 ,  H04L27/16

    CPC classification number: H04L27/2672 ,  H04L27/16 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2682 ,  H04L27/2684

    Abstract: Receiver and method in a receiver, for estimating a normalised frequency offset between a transmitter and the receiver in a wireless communication system, based on Orthogonal Frequency Division Multiplexing, OFDM. The method comprises receiving a first pilot signal (yr1) and a second pilot signal (yr2) from the transmitter; computing a Karhunen-Loeve approximation λK(φ), up to any finite order K of a log-likelihood function λ(φ), based on the received pilot signals (yr1, yr2); and estimating the frequency offset by calculating a maximum value of the computed Karhunen-Loeve approximation λK(φ).

    Abstract translation: 接收机中的接收机和方法，用于基于正交频分复用OFDM估计无线通信系统中的发射机与接收机之间的归一化频率偏移。 该方法包括从发射机接收第一导频信号（yr1）和第二导频信号（yr2）; 基于接收到的导频信号（yr1，yr2），计算到对数似然函数λ（＆phgr;）的任何有限阶K的Karhunen-Loeve近似λK（＆phgr） 并且通过计算所计算的Karhunen-Loeve近似值λK（＆phgr）的最大值来估计频率偏移。

    Method for detection of symbols in communication signals
    12.
    发明授权
    Method for detection of symbols in communication signals 有权
    通信信号中符号检测方法

    公开(公告)号：US09071316B2

    公开(公告)日：2015-06-30

    申请号：US14045832

    申请日：2013-10-04

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Fredrik Rusek

    IPC: H04B1/10 ,  H04L25/03

    CPC classification number: H04B1/1027 ,  H04L25/03171 ,  H04L25/067

    Abstract: The present invention relates to method for detection of symbols, comprising: receiving at least one communication signal y transmitted over a radio channel H, and receiving a priori LLRs of said channel inputs x; computing soft symbol estimates μ and variance D of said channel inputs x based on LLRs of said channel inputs x; filtering and interference cancelling said received signal y by using a first filter and filtered soft symbol estimates μ so as to obtain a filtered and interference cancelled received signal; estimating MSE matrix B of said filtered and interference cancelled received signal; computing an optimal matrix Gopt for a BCJR algorithm based on said MSE estimate B; further filtering said filtered and interference cancelled received signal by using a second filter so as to obtain an input signal r to the BCJR algorithm; and feeding said input signal r into the BCJR algorithm.

    Abstract translation: 本发明涉及用于检测符号的方法，包括：接收通过无线电信道H发送的至少一个通信信号y，以及接收所述信道输入x的先验LLR; 基于所述信道输入x的LLR计算所述信道输入x的软符号估计μ和方差D; 通过使用第一滤波器和滤波的软符号估计μ来滤波和干扰所述接收信号y，从而获得滤波和干扰消除的接收信号; 估计所述滤波和干扰消除的接收信号的MSE矩阵B; 基于所述MSE估计B计算BCJR算法的最优矩阵Gopt; 通过使用第二滤波器进一步滤波所述经滤波和干扰消除的接收信号，以便获得到BCJR算法的输入信号r; 并将所述输入信号r馈送到BCJR算法中。

    Method for Detection of Symbols in Communication Signals
    13.
    发明申请
    Method for Detection of Symbols in Communication Signals 有权
    通信信号符号检测方法

    公开(公告)号：US20150098533A1

    公开(公告)日：2015-04-09

    申请号：US14045832

    申请日：2013-10-04

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Fredrik Rusek

    IPC: H04B1/10 ,  H04L25/03

    CPC classification number: H04B1/1027 ,  H04L25/03171 ,  H04L25/067

    Abstract: The present invention relates to method for detection of symbols, comprising: receiving at least one communication signal y transmitted over a radio channel H, and receiving a priori LLRs of said channel inputs x; computing soft symbol estimates μ and variance D of said channel inputs x based on LLRs of said channel inputs x; filtering and interference cancelling said received signal y by using a first filter and filtered soft symbol estimates μ so as to obtain a filtered and interference cancelled received signal; estimating MSE matrix B of said filtered and interference cancelled received signal; computing an optimal matrix Gopt for a BCJR algorithm based on said MSE estimate B; further filtering said filtered and interference cancelled received signal by using a second filter so as to obtain an input signal r to the BCJR algorithm; and feeding said input signal r into the BCJR algorithm.

    Abstract translation: 本发明涉及用于检测符号的方法，包括：接收通过无线电信道H发送的至少一个通信信号y，以及接收所述信道输入x的先验LLR; 基于所述信道输入x的LLR计算所述信道输入x的软符号估计μ和方差D; 通过使用第一滤波器和滤波的软符号估计μ来滤波和干扰消除所述接收信号y，以获得滤波和干扰消除的接收信号; 估计所述滤波和干扰消除的接收信号的MSE矩阵B; 基于所述MSE估计B计算BCJR算法的最优矩阵Gopt; 通过使用第二滤波器进一步滤波所述经滤波和干扰消除的接收信号，以便获得到BCJR算法的输入信号r; 并将所述输入信号r馈送到BCJR算法中。

    Method for detecting eavesdroppers in a wireless communication system
    18.
    发明授权
    Method for detecting eavesdroppers in a wireless communication system 有权
    一种用于在无线通信系统中检测窃听者的方法

    公开(公告)号：US09380458B2

    公开(公告)日：2016-06-28

    申请号：US13956009

    申请日：2013-07-31

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Fredrik Rusek

    IPC: H04W12/02 ,  H04W24/08 ,  H04W12/12

    CPC classification number: H04W12/02 ,  H04K3/22 ,  H04K3/224 ,  H04K3/65 ,  H04K3/822 ,  H04K2203/16 ,  H04K2203/36 ,  H04W12/12

    Abstract: The present invention relates to a method in a wireless communication system for determining whether an active eavesdropper is interfering in transmissions on a radio channel from a transmitter to a receiver, the method comprising the steps of: estimating, by said transmitter, a first effective channel gain of said radio channel at said receiver; estimating, by said receiver, a second effective channel gain of said radio channel at said receiver; and determining whether an active eavesdropper is interfering in the transmissions by comparing said first and second effective channel gains. Furthermore, the invention also relates to a method in a receiver, a receiver device, a computer program, and a computer program product thereof.

    Abstract translation: 本发明涉及无线通信系统中的方法，用于确定主动窃听者是否正在干扰从发射机到接收机的无线电信道上的传输，所述方法包括以下步骤：由所述发射机估计第一有效信道 在所述接收机处的所述无线电信道的增益; 由所述接收机估计所述接收机处的所述无线电信道的第二有效信道增益; 以及通过比较所述第一和第二有效信道增益来确定主动窃听者是否干扰所述传输。 此外，本发明还涉及接收机，接收机设备，计算机程序及其计算机程序产品中的方法。

    Method for estimating covariance matrices and use thereof
    19.
    发明授权
    Method for estimating covariance matrices and use thereof 有权
    估计协方差矩阵的方法及其用途

    公开(公告)号：US09160383B2

    公开(公告)日：2015-10-13

    申请号：US14077968

    申请日：2013-11-12

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Jianjun Chen ,  Fredrik Rusek ,  Sha Hu ,  Gengshi Wu ,  Basuki Endah Priyanto ,  Shashi Kant

    IPC: H04L27/06 ,  H04L27/01 ,  H03D1/04 ,  H04B1/10 ,  H04B7/04 ,  H04B1/16

    CPC classification number: H04B1/1027 ,  H04B1/16 ,  H04B7/0413 ,  H04B7/0456 ,  H04B7/0891 ,  H04L25/03305 ,  H04L2025/03426

    Abstract: The present disclosure relates to an iterative method for estimating covariance matrices of communication signals comprising a) computing a reference symbol covariance matrix estimate (k,l); b) inputting said reference symbol covariance matrix estimate (k,l) to a detector or a decoder in a first iteration, and thereafter inputting the covariance matrix estimate output from e) to the detector or the decoder in subsequent iterations to obtain an updated demodulated or decoded communication signal for each iteration; c) inputting the demodulated or decoded communication signal to a symbol generator; d) computing an updated data covariance matrix estimate (k,l) for each iteration based on data symbols of said regenerated communication signal; e) combining said reference symbol covariance matrix estimate (k,l) and said updated data covariance matrix estimate (k,l); and f) forwarding said covariance matrix estimate output to the detector or decoder in b) to obtain the updated demodulated or decoded communication signal for each iteration.

    Abstract translation: 本公开涉及一种用于估计通信信号的协方差矩阵的迭代方法，包括：a）计算参考符号协方差矩阵估计（k，l）; b）在第一次迭代中将所述参考符号协方差矩阵估计（k，l）输入到检测器或解码器，然后在随后的迭代中将从e）输出的协方差矩阵估计输入到检测器或解码器，以获得更新的解调 或每个迭代的解码通信信号; c）将解调或解码的通信信号输入到符号发生器; d）基于所述再生通信信号的数据符号计算每次迭代的更新数据协方差矩阵估计（k，l）; e）组合所述参考符号协方差矩阵估计（k，l）和所述更新的数据协方差矩阵估计（k，l）; 以及f）在b）中将所述协方差矩阵估计输出转发到检测器或解码器，以获得每次迭代的经更新的解调或解码的通信信号。

    Methods and user equipment in a wireless communication network
    20.
    发明授权
    Methods and user equipment in a wireless communication network 有权
    无线通信网络中的方法和用户设备

    公开(公告)号：US09118446B2

    公开(公告)日：2015-08-25

    申请号：US14031805

    申请日：2013-09-19

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Sha Hu ,  Fredrik Rusek ,  Gengshi Wu ,  Shashi Kant ,  Basuki Endah Priyanto ,  Jianjun Chen

    IPC: H04L1/00 ,  H04W24/02 ,  H04B7/04

    CPC classification number: H04L1/0054 ,  H04B7/0413 ,  H04L25/0328 ,  H04L25/03318 ,  H04L25/03891 ,  H04W24/02

    Abstract: A user equipment (UE) and a method are presented. The UE comprises a receiver unit and a processing circuit, and is configured for receiving wireless signals. The processing circuit is arranged for performing pre-detection of the received signals providing an initial estimation of transmitted signals. The processing circuit is also arranged for splitting the transmitted signal into disjoint subgroups, each one covering a subgroup of all layers used for the transmitted signal such that the subgroups together cover all the layers. The processing circuit is also arranged for interference cancellation performed on the subgroups of transmitted signals based on the initial estimation of the transmitted signals. The processing circuit is also arranged for detection of the subgroups of transmitted signals by utilization of an MLD algorithm, wherein the subgroup of layers within each one of the subgroups of transmitted signals is detected simultaneously.

    Abstract translation: 提出了一种用户设备（UE）和方法。 UE包括接收器单元和处理电路，并且被配置为用于接收无线信号。 该处理电路用于执行提供传输信号的初始估计的接收信号的预检测。 处理电路还被布置为将发送的信号分离成不相交的子组，每个子组覆盖用于发送信号的所有层的子组，使得子组一起覆盖所有层。 处理电路还被布置成基于发射信号的初始估计对发射信号的子组执行干扰消除。 该处理电路还用于利用MLD算法来检测发送信号的子组，其中同时检测发送信号的每个子组内的每个子组的子组。

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