专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US08594210B2 Method and apparatus for positioning an FFT-window in an OFDM-receiver 有权
标题翻译：用于在OFDM接收机中定位FFT窗口的方法和装置
公开(公告)号：US08594210B2
公开(公告)日：2013-11-26
申请号：US12746518
申请日：2008-12-08
申请人： Leif Wilhelmsson , Lars Björkman , Fredrik Nordström
发明人： Leif Wilhelmsson , Lars Björkman , Fredrik Nordström
IPC分类号： H04L27/28
CPC分类号： H04L27/2662 , H04L5/0007 , H04L25/0216 , H04L25/022 , H04L25/0232 , H04L27/2657 , H04L27/2665
摘要： Methods for positioning an FFT-window in an OFDM-receiver are disclosed as well as electronic apparatuses and computer program products for performing the methods. The method comprises determining a position of the FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal, using the position of the FFT-window to obtain a first OFDM-symbol from the received OFDM-signal, and applying an FFT to the first OFDM-symbol to produce an FFT-output signal. The method also comprises determining a frequency dependent phase rotation component of the FFT-output signal, and removing the determined frequency dependent phase rotation component from the FFT-output signal to obtain a compensated FFT-output signal. A delay spread estimate is calculated based on at least one of the FFT-output signal and the compensated FFT-output signal, and the position of the FFT-window is adjusted based on at least the determined frequency dependent phase rotation component and the calculated delay spread estimate.
摘要翻译：公开了在OFDM接收机中定位FFT窗口的方法以及用于执行方法的电子设备和计算机程序产品。该方法包括使用FFT窗口的位置从接收的OFDM信号中获得第一OFDM符号来确定FFT窗口相对于接收的OFDM信号的一个或多个OFDM符号的位置，以及对第一OFDM符号应用FFT以产生FFT输出信号。该方法还包括确定FFT输出信号的频率相关相位旋转分量，以及从FFT输出信号中去除所确定的频率相关相位旋转分量以获得经补偿的FFT输出信号。基于FFT输出信号和经补偿的FFT输出信号中的至少一个来计算延迟扩展估计，并且至少基于所确定的频率相关相位旋转分量和所计算的延迟来调整FFT窗口的位置传播估计。

2. 发明申请

US20100135423A1 Determining a Frequency Error in a Receiver of a Wireless Communications System 有权
标题翻译：确定无线通信系统的接收机中的频率误差
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。

3. 发明授权

US08270509B2 Determining a frequency error in a receiver of a wireless communications system 有权
标题翻译：确定无线通信系统的接收机中的频率误差
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。

4. 发明申请

US20120219041A1 Operation of user equipment when control and data information are supplied by different radio units 有权
标题翻译：控制和数据信息由不同的无线电单元提供时，用户设备的操作
公开(公告)号：US20120219041A1
公开(公告)日：2012-08-30
申请号：US13036523
申请日：2011-02-28
申请人： Bengt Lindoff , Fredrik Nordström , Leif Wilhelmsson
发明人： Bengt Lindoff , Fredrik Nordström , Leif Wilhelmsson
IPC分类号： H04B1/38
CPC分类号： H04L25/03343 , H04L27/2646 , H04W56/0015 , H04W56/0045
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmission from a non-reference transceiver to a user equipment (UE) in a mobile communication system is generated by ascertaining a general timing for transmission of OFDM symbols, wherein the general timing is associated with a reference transceiver. A UE timing relative to the general timing is ascertained. An initial resource element (RE) value is adjusted by a pre-compensating amount to obtain a pre-compensated RE value, wherein the pre-compensating amount is based on the UE timing relative to the general timing. The pre-compensated resource element value is supplied as one of a plurality of values to be transmitted. An IFFT is performed on the plurality of values to be transmitted to obtain pre-compensated initial signal information. A cyclic prefix is appended to the pre-compensated initial signal information to form an OFDM symbol for transmission from the non-reference transceiver to the UE.
摘要翻译：通过确定用于OFDM符号的传输的一般定时来生成用于在移动通信系统中从非参考收发器到用户设备（UE）的传输的正交频分复用（OFDM）符号，其中，一般定时与参考收发器。确定相对于一般定时的UE定时。通过预补偿量来调整初始资源元素（RE）值以获得预补偿RE值，其中预补偿量基于相对于一般定时的UE定时。预补偿资源元素值被提供为要发送的多个值之一。对要发送的多个值执行IFFT以获得预补偿的初始信号信息。将循环前缀附加到预补偿的初始信号信息以形成用于从非参考收发器到UE的传输的OFDM符号。

5. 发明授权

US08023600B2 Method and apparatus for interference rejection combining and detection 有权
标题翻译：用于干扰抑制组合和检测的方法和装置
公开(公告)号：US08023600B2
公开(公告)日：2011-09-20
申请号：US12138743
申请日：2008-06-13
申请人： Bengt Lindoff , Johan Nilsson , Fredrik Nordström , Leif Wilhelmsson
发明人： Bengt Lindoff , Johan Nilsson , Fredrik Nordström , Leif Wilhelmsson
IPC分类号： H04L1/02 , H03D1/04 , H04B15/00
CPC分类号： H04B7/086 , H04B17/345 , H04J11/005 , H04J11/0093 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/0242
摘要： A multi-branch OFDM receiver combines diversity signals received over different receiver branches using interference rejection combining. The receiver generates first channel estimates associated with a serving base station, second channel estimates associated with at least one non-serving base station, and a time offset between the serving base station and non-serving base station. The receiver computes a noise covariance matrix based on the second channel estimates and the time offset, and then combines the diversity signals received over different branches using the first channel estimates and the noise covariance matrix.
摘要翻译：多分支OFDM接收机使用干扰抑制组合来组合在不同接收机分支上接收的分集信号。接收机产生与服务基站相关联的第一信道估计，与至少一个非服务基站相关联的第二信道估计，以及服务基站与非服务基站之间的时间偏移。接收机基于第二信道估计和时间偏移来计算噪声协方差矩阵，然后使用第一信道估计和噪声协方差矩阵组合在不同分支上接收的分集信号。

6. 发明授权

US08744020B2 Frequency offset estimation 有权
标题翻译：频偏估计
公开(公告)号：US08744020B2
公开(公告)日：2014-06-03
申请号：US13127044
申请日：2009-10-30
申请人： Niklas Andgart , Fredrik Nordström
发明人： Niklas Andgart , Fredrik Nordström
IPC分类号： H04L27/06
CPC分类号： H04L27/2659 , H04L5/0007 , H04L25/023
摘要： A frequency offset of a received signal comprising a number of subsequently received data symbols is estimated. A first estimate is determined from a calculated change in phase of the received signal between two received symbols having a first time distance between them. At least one further estimate is determined from a calculated change in phase of the received signal between two received symbols having a different time distance. A frequency periodicity is determined for each estimate from the distance between the two received symbols from which the estimate was determined. A set of integer values is determined for each estimate so that frequency values calculated for each estimate as the frequency periodicity multiplied by the integer value added to the estimate are at least approximately equal to each other, and a corrected estimate of the frequency offset is determined from the integer values.
摘要翻译：估计包括多个随后接收的数据符号的接收信号的频率偏移。从在它们之间具有第一时间距离的两个接收符号之间的接收信号的计算的相位变化确定第一估计。从具有不同时间距离的两个接收符号之间的接收信号的计算的相位变化确定至少一个另外的估计。根据确定估计的两个接收符号之间的距离为每个估计确定频率周期。为每个估计确定一组整数值，使得为每个估计计算的频率值作为频率周期乘以加到估计的整数值至少近似相等，并且确定频率偏移的校正估计从整数值。

7. 发明申请

US20120219094A1 Operation of User Equipment When Control and Data Information are Supplied by Different Radio Units 有权
标题翻译：控制和数据信息由不同的无线电单元提供时，用户设备的操作
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。

8. 发明申请

US20110300819A1 Receiver and a Method for Mobile Communications 有权
标题翻译：接收机和移动通信方法
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。

9. 发明授权

US08768258B2 Receiver and a method for mobile communications 有权
标题翻译：接收机和移动通信方法
公开(公告)号：US08768258B2
公开(公告)日：2014-07-01
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： H04B1/00 , H04B1/16 , H04J3/06
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。

10. 发明授权

US08687745B2 Method and apparatus for blind decoding 有权
标题翻译：用于盲解码的方法和装置
公开(公告)号：US08687745B2
公开(公告)日：2014-04-01
申请号：US12134243
申请日：2008-06-06
申请人： Bengt Lindoff , Matthias Kamuf , Fredrik Nordström
发明人： Bengt Lindoff , Matthias Kamuf , Fredrik Nordström
IPC分类号： H03D1/00 , H04L27/06
CPC分类号： H04L1/0091 , H04L1/0038 , H04L1/0046
摘要： According to the teachings presented herein, a method and apparatus provide a reduced search space for blindly decoding a message included in a signal received at a communication receiver, where the message has an unknown format. Improving blind detection efficiency in this manner offers numerous advantages, including but not limited to lower power consumption through reduced processing overhead, and lower power consumption through expanded sleep opportunities. As a non-limiting example, the communication receiver comprises a mobile station configured for operation according to Long Term Evolution (LTE) standards, as promulgated by the 3GPP for E-UTRA systems, where the mobile station is configured to reduce a search space of DCI message decoding by determining message format likelihoods and blindly decoding a received DCI message based on the message format likelihoods.
摘要翻译：根据本文呈现的教导，一种方法和装置提供减少的搜索空间，用于盲目地解码包括在通信接收器处接收的信号中的消息，其中消息具有未知格式。以这种方式提高盲目检测效率提供了许多优点，包括但不限于通过减少处理开销降低功耗，并通过扩展的睡眠机会降低功耗。作为非限制性示例，通信接收机包括被配置用于根据长期演进（LTE）标准进行操作的移动台，如3GPP针对E-UTRA系统所公布的，其中移动台被配置为减少搜索空间通过确定消息格式似然性并基于消息格式可能性对接收的DCI消息进行盲解码来进行DCI消息解码。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式