公开(公告)号：US20150180696A1

公开(公告)日：2015-06-25

申请号：US14553845

申请日：2014-11-25

Applicant: Huawei Technologies Co., Ltd.

Inventor： Fredrik RUSEK ,  Basuki Endah PRIYANTO

IPC: 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。

公开(公告)号：US20150131758A1

公开(公告)日：2015-05-14

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: H04B1/10 ,  H04B1/16 ,  H04B7/04

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。