公开(公告)号：US20130028354A1

公开(公告)日：2013-01-31

申请号：US13578123

申请日：2011-02-03

申请人： Bengt Lindoff ,  Bo Lincoln ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Bo Lincoln ,  Fredrik Nordström

IPC分类号： H04L27/28

CPC分类号： H04L27/2647 ,  H04B7/0845 ,  H04L25/0202 ,  H04L27/2666

摘要： A transmitted OFDM signal is detected in a receiver of a wireless communication system. The receiver has at least two receiver branches, each comprising an antenna, a front end receiver, a Discrete Fourier Transform unit, and a channel estimator. The receiver further comprises a detector for detecting received data symbols. The method comprises the steps of determining a system bandwidth associated with the transmitted signal; comparing the determined system bandwidth with a predetermined value; determining, if the system bandwidth is lower than the predetermined value, channel estimates separately for each branch, and detecting received data symbols from the received signals and corresponding channel estimates; and calculating, if the system bandwidth is higher than the predetermined value, a weighted sum of signals from each branch, determining a combined channel estimate, and detecting received data symbols from the weighted sum and the combined channel estimate.

摘要翻译： 在无线通信系统的接收机中检测到发送的OFDM信号。 接收器具有至少两个接收器分支，每个接收器分支包括天线，前端接收器，离散傅立叶变换单元和信道估计器。 接收机还包括用于检测接收到的数据符号的检测器。 该方法包括以下步骤：确定与发射信号相关联的系统带宽; 将所确定的系统带宽与预定值进行比较; 确定如果系统带宽低于预定值，则针对每个分支分别进行信道估计，并且从接收到的信号和对应的信道估计中检测接收到的数据符号; 并且如果系统带宽高于预定值，则计算来自每个分支的信号的加权和，确定组合的信道估计，以及从加权和和组合的信道估计中检测接收到的数据符号。

公开(公告)号：US08306012B2

公开(公告)日：2012-11-06

申请号：US12203649

申请日：2008-09-03

申请人： Bengt Lindoff ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Fredrik Nordström

IPC分类号： H04J3/06

CPC分类号： H04L5/0007 ,  H04J11/0086 ,  H04L25/0204 ,  H04L25/022

摘要： Channel estimation is performed by user equipment operating in a mobile communications system. Estimation involves receiving a signal and analyzing it to detect a signal component from a neighboring cell. Depending on outcome, one or both of the following are determined: whether a power level of the signal component from the neighboring cell exceeds a power threshold level; and whether a difference between timing parameters of the neighboring cell's signal component and that from a serving cell is less than a timing threshold level. If the power level of the neighboring cell's signal component exceeds the power threshold level and the difference between the timing parameters of the signal components from the neighboring cell and that of the serving cell is less than the timing threshold level, then a joint channel estimation process is performed. Otherwise, a single channel estimation process is performed.

摘要翻译： 信道估计由在移动通信系统中操作的用户设备执行。 估计涉及接收信号并对其进行分析以检测来自相邻小区的信号分量。 取决于结果，确定以下中的一个或两个：来自相邻小区的信号分量的功率电平是否超过功率阈值电平; 以及相邻小区的信号分量的定时参数与来自服务小区的定时参数之间的差是否小于定时阈值水平。 如果相邻小区的信号分量的功率电平超过功率阈值电平，并且来自相邻小区的信号分量和服务小区的信号分量的定时参数之间的差小于定时阈值电平，则联合信道估计过程 被执行。 否则，执行单个信道估计处理。

公开(公告)号：US08270509B2

公开(公告)日：2012-09-18

申请号：US12598613

申请日：2008-05-05

申请人： Bengt Lindoff ,  Leif Wilhelmsson ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Leif Wilhelmsson ,  Fredrik Nordström

IPC分类号： H04K1/10

CPC分类号： H04L27/2657 ,  H04L27/2613 ,  H04L27/2675

摘要： A frequency error of received signals in an OFDM receiver of a wireless communications system is determined. Symbols of a given duration are transmitted as cells on sub-carrier frequencies; and some of the cells are pilot cells modulated with reference information. The method comprises the steps of selecting at least three pilot cells (p0, p1, p2) from different symbols and different sub-carriers; determining the symbol and the sub-carrier on which each pilot cell is transmitted; determining for each pilot cell a phase difference between received and generated signals; calculating therefrom a change in phase difference (Φx) caused by the frequency error; and calculating the frequency error from the calculated change in phase difference (Φx). In this way a receiver capable of determining a frequency error also in situations where only a short data burst, such as a single resource block, is available for the estimation is provided.

摘要翻译： 确定无线通信系统的OFDM接收机中的接收信号的频率误差。 给定持续时间的符号作为小区在子载波频率上发送; 并且一些小区是用参考信息调制的导频小区。 该方法包括从不同符号和不同子载波中选择至少三个导频小区（p0，p1，p2）的步骤; 确定发送每个导频小区的符号和子载波; 为每个导频小区确定接收和产生的信号之间的相位差; 由此计算由频率误差引起的相位差（Φx）的变化; 并根据计算的相位差变化（Φx）计算频率误差。 以这种方式，能够在只有短数据突发（例如单个资源块）可用于估计的情况下也能够确定频率误差的接收机被提供。

公开(公告)号：US20120231790A1

公开(公告)日：2012-09-13

申请号：US13161133

申请日：2011-06-15

申请人： Bengt Lindoff ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Fredrik Nordström

IPC分类号： H04W48/16

CPC分类号： H04W48/16 ,  H04J11/004 ,  H04J11/0076 ,  H04W56/0015 ,  H04W56/0085 ,  H04W84/045 ,  H04W84/047 ,  Y02D70/1262

摘要： In a heterogeneous network, low power cells are detected by correlating a first and second signal originating from an unknown cell, such as synchronization signals, e.g., SSS received in a first and second time period (e.g., subframes 0 and 5 of a frame with corresponding sets of possible SSS signals. The cell identities for the candidate cells can be used to determine corresponding reference symbol sequences for the candidate cells. The final determination of the cell identity is then made by correlating a third signal originating from the unknown cell, such as a reference signal received in a third time period (e.g., an almost blank subframe or a broadcast subframe) with the set of reference signals for the candidate cells. The correct cell identity is determined to be the cell identity yielding the greatest correlation with its corresponding reference signal.

摘要翻译： 在异构网络中，通过将来自未知小区的第一和第二信号相互关联来检测低功率小区，例如同步信号，例如在第一和第二时间段（例如，帧的子帧0和5中的SSS 可能的SSS信号的相应集合，候选小区的小区标识可以用于确定候选小区的对应参考符号序列，然后通过将来自未知小区的第三信号相关联来进行小区标识的最终确定， 作为在第三时间段（例如，几乎空白的子帧或广播子帧）中接收的参考信号与候选小区的参考信号的集合，正确的小区标识被确定为与其相关的最大相关性的小区标识 相应的参考信号。

公开(公告)号：US20120219094A1

公开(公告)日：2012-08-30

申请号：US13033722

申请日：2011-02-24

申请人： Bengt Lindoff ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Fredrik Nordström

IPC分类号： H04L27/00 ,  H04B1/06

CPC分类号： H04L27/2657 ,  H04L5/005 ,  H04L5/0051 ,  H04L25/0204 ,  H04L25/0224 ,  H04L27/2662 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2695 ,  H04W56/001 ,  H04W56/0035

摘要： A receiver operates in a mobile communication system that comprises first node and second nodes, the first and second nodes transmitting common control signals and dedicated data signals, respectively. The receiver determines a first timing rotation and/or a first frequency rotation of the common control signals and a second timing rotation and/or a second frequency rotation of the dedicated data signals. The receiver determines a first and/or second difference, wherein the first difference is a difference between the first timing rotation of the common control signals and the second timing rotation of the dedicated data signals and the second difference is a difference between the first frequency rotation of the common control signals and the second frequency rotation of the dedicated data signals. An adapted timing of dedicated data signals is produced based on the first and/or second differences, and the adapted timing is used to receive dedicated data signals.

摘要翻译： 接收机在包括第一节点和第二节点的移动通信系统中操作，第一和第二节点分别发送公共控制信号和专用数据信号。 接收机确定公共控制信号的第一定时旋转和/或第一频率旋转以及专用数据信号的第二定时旋转和/或第二频率旋转。 接收机确定第一和/或第二差异，其中第一差是公共控制信号的第一定时旋转和专用数据信号的第二定时旋转之间的差，第二差是第一频率旋转 的公共控制信号和专用数据信号的第二频率旋转。 基于第一和/或第二差产生专用数据信号的适应定时，并且使用适配的定时来接收专用数据信号。

公开(公告)号：US20110300819A1

公开(公告)日：2011-12-08

申请号：US13140009

申请日：2009-12-14

申请人： Fredrik Nordström ,  Bengt Lindoff

发明人： Fredrik Nordström ,  Bengt Lindoff

IPC分类号： H04W88/02

CPC分类号： H04L5/0032 ,  H04B1/10 ,  H04L25/0204 ,  H04L25/0228 ,  H04L27/2665 ,  H04W56/001

摘要： In a method and a mobile communications receiver for processing signals from a first cell and a second cell a timing of the signal from the first cell and the second cell is obtained. A timing difference (δ) between the timings of signals from the first and the second cell is determined and based on that a timing (κ) for a window for discrete Fourier transform, DFT, processing is adjusted. DFT processing of the signals using the timing (κ) of the DFT window is then performed.

摘要翻译： 在用于处理来自第一小区和第二小区的信号的方法和移动通信接收机中，获得来自第一小区和第二小区的信号的定时。 确定来自第一和第二小区的信号的定时之间的定时差（δ），并且基于用于离散付里叶变换的窗口的DFT处理的定时（＆kgr）进行调整。 然后执行使用DFT窗口的定时（＆kgr）的信号的DFT处理。

公开(公告)号：US20100135423A1

公开(公告)日：2010-06-03

申请号：US12598613

申请日：2008-05-05

申请人： Bengt Lindoff ,  Leif Wilhelmsson ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Leif Wilhelmsson ,  Fredrik Nordström

IPC分类号： H04L27/28 ,  H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2613 ,  H04L27/2675

摘要： A frequency error of received signals in an OFDM receiver of a wireless communications system is determined. Symbols of a given duration are transmitted as cells on sub-carrier frequencies; and some of the cells are pilot cells modulated with reference information. The method comprises the steps of selecting at least three pilot cells (p0, p1, p2) from different symbols and different sub-carriers; determining the symbol and the sub-carrier on which each pilot cell is transmitted; determining for each pilot cell a phase difference between received and generated signals; calculating therefrom a change in phase difference (Φx) caused by the frequency error; and calculating the frequency error from the calculated change in phase difference (Φx). In this way a receiver capable of determining a frequency error also in situations where only a short data burst, such as a single resource block, is available for the estimation is provided.

摘要翻译： 确定无线通信系统的OFDM接收机中的接收信号的频率误差。 给定持续时间的符号作为小区在子载波频率上发送; 并且一些小区是用参考信息调制的导频小区。 该方法包括从不同符号和不同子载波中选择至少三个导频小区（p0，p1，p2）的步骤; 确定发送每个导频小区的符号和子载波; 为每个导频小区确定接收和产生的信号之间的相位差; 由此计算由频率误差引起的相位差（Φx）的变化; 并根据计算的相位差变化（Φx）计算频率误差。 以这种方式，能够在只有短数据突发（例如单个资源块）可用于估计的情况下也能够确定频率误差的接收机被提供。

公开(公告)号：US09363697B2

公开(公告)日：2016-06-07

申请号：US14238221

申请日：2012-07-05

申请人： Bengt Lindoff ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Fredrik Nordström

IPC分类号： H04B17/309 ,  H04B17/336 ,  H04W72/08 ,  H04L1/00 ,  H04W24/08 ,  H04L1/18 ,  H04L1/20 ,  H04B17/24 ,  H04B17/373

CPC分类号： H04L5/0057 ,  H04B17/24 ,  H04B17/309 ,  H04B17/373 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/1812 ,  H04L1/20 ,  H04L1/203 ,  H04W24/08 ,  H04W72/085

摘要： A method of a transceiver arranged to operate in a cellular communication system comprising cells is disclosed. The method comprises receiving a transmission from a first cell; determining an interfering signal and its occupation in time and/or frequency; determining reduced values in the received signal corresponding to the occupation in time and/or frequency of the interfering signal; and measuring a quotient between desired signal and non-desired signal of reference symbols of the received signal. A channel quality index, CQI, is formed taking into account reduction of values performed at the reducing, and the CQI is reported to the communication system. A transceiver and computer program for the same are also disclosed.

摘要翻译： 公开了一种布置成在包括小区的蜂窝通信系统中操作的收发机的方法。 该方法包括从第一小区接收传输; 确定干扰信号及其在时间和/或频率上的占用; 确定对应于干扰信号的时间和/或频率中的占用的接收信号中的减小值; 并测量接收信号的参考符号的期望信号和非期望信号之间的商。 考虑到减少执行的值的减少而形成信道质量指标CQI，并将CQI报告给通信系统。 还公开了一种用于其的收发器和计算机程序。

公开(公告)号：US09042336B2

公开(公告)日：2015-05-26

申请号：US13527224

申请日：2012-06-19

申请人： Fredrik Nordström ,  Bengt Lindoff

发明人： Fredrik Nordström ,  Bengt Lindoff

IPC分类号： H04W72/04 ,  H04L5/00

CPC分类号： H04W72/0446 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0222 ,  H04L25/03343 ,  H04L25/03949 ,  H04L27/261

摘要： In a system using spatial precoding, in the event that reliable channel state information is unavailable, a transmitting node uses an extended transmission mode, in which the precoders applied to data within each of several groups of time-frequency resources vary according to frequency. The extended transmission mode creates a frequency-selective variation in precoders, which may appear to be random, while using DMRS-based transmission. This variation is achieved by applying different precoders to the resource elements carrying data, using a pattern of precoder variation that is known to the receiving device. The precoding applied to DMRS within a given group of time-frequency resources is held constant—thus, the varying precoders within a given group of time-frequency resources are only applied to data elements, not to the DMRS resource elements.

摘要翻译： 在使用空间预编码的系统中，在可靠的信道状态信息不可用的情况下，发送节点使用扩展传输模式，其中应用于几组时频资源中的每一组中的数据的预编码器根据频率而变化。 在使用基于DMRS的传输时，扩展传输模式在预编码器中产生频率选择性变化，其可能看起来是随机的。 通过使用接收设备已知的预编码器变化的模式，将不同的预编码器应用于携带数据的资源元件来实现。 在给定的一组时间 - 频率资源内的DMRS应用的预编码保持不变，因此，给定的一组时间 - 频率资源内的变化的预编码器仅被应用于数据元素而不是DMRS资源元素。

公开(公告)号：US09014169B2

公开(公告)日：2015-04-21

申请号：US13161133

申请日：2011-06-15

申请人： Bengt Lindoff ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Fredrik Nordström

IPC分类号： H04J3/06 ,  H04W4/00 ,  H04W48/16 ,  H04W56/00 ,  H04J11/00 ,  H04W84/04

CPC分类号： H04W48/16 ,  H04J11/004 ,  H04J11/0076 ,  H04W56/0015 ,  H04W56/0085 ,  H04W84/045 ,  H04W84/047 ,  Y02D70/1262

摘要： In a heterogeneous network, low power cells are detected by correlating a first and second signal originating from an unknown cell, such as synchronization signals, e.g., SSS received in a first and second time period (e.g., subframes 0 and 5 of a frame with corresponding sets of possible SSS signals. The cell identities for the candidate cells can be used to determine corresponding reference symbol sequences for the candidate cells. The final determination of the cell identity is then made by correlating a third signal originating from the unknown cell, such as a reference signal received in a third time period (e.g., an almost blank subframe or a broadcast subframe) with the set of reference signals for the candidate cells. The correct cell identity is determined to be the cell identity yielding the greatest correlation with its corresponding reference signal.

摘要翻译： 在异构网络中，通过将来自未知小区的第一和第二信号相互关联来检测低功率小区，例如同步信号，例如在第一和第二时间段（例如，帧的子帧0和5中的SSS 可能的SSS信号的相应集合，候选小区的小区标识可以用于确定候选小区的对应参考符号序列，然后通过将来自未知小区的第三信号相关联来进行小区标识的最终确定， 作为在第三时间段（例如，几乎空白的子帧或广播子帧）中接收的参考信号与候选小区的参考信号的集合，正确的小区标识被确定为与其相关的最大相关性的小区标识 相应的参考信号。