公开(公告)号：US20120051464A1

公开(公告)日：2012-03-01

申请号：US12869816

申请日：2010-08-27

申请人： Matthias Kamuf ,  Bengt Lindoff ,  Sven Mattisson ,  Fredrik Nordström

发明人： Matthias Kamuf ,  Bengt Lindoff ,  Sven Mattisson ,  Fredrik Nordström

IPC分类号： H04L27/06 ,  H04L25/08

CPC分类号： H04L27/2647 ,  H04L25/03292 ,  H04L25/03318 ,  H04L2025/03414

摘要： Decoding a received Orthogonal Frequency Division Multiplex (OFDM) signal that occupies a first set of subcarriers in a radio frequency spectrum includes ascertaining an interference model that represents interference occurring in the first set of subcarriers caused by a transmitted OFDM signal that occupies a second set of subcarriers in the radio frequency spectrum. A set of scaled soft values is produced that represents information conveyed by the received OFDM signal over the first set of subcarriers, wherein each scaled soft value in the set of scaled soft values corresponds to a respective one of the subcarriers in the first set of subcarriers, and wherein a scaling amount applied to each of the scaled soft values is based on a corresponding level of interference in said respective one of the subcarriers as indicated by the interference model. A decoding process is performed that generates detected data from the scaled soft values.

摘要翻译： 解码在无线电频谱中占用第一组子载波的接收的正交频分多路复用（OFDM）信号包括确定干扰模型，其表示由发送的OFDM信号引起的第一组子载波中所发生的干扰，所述OFDM信号占用第二组 无线电频谱中的子载波。 产生一组缩放的软值，其表示在第一组子载波上由接收的OFDM信号传送的信息，其中该缩放的软值集合中的每个缩放的软值对应于第一组子载波中的相应的一个子载波 ，并且其中应用于每个所述缩放的软值的缩放量基于由所述干扰模型指示的所述相应一个子载波中的相应的干扰电平。 执行从缩放的软值生成检测数据的解码处理。

公开(公告)号：US08050343B2

公开(公告)日：2011-11-01

申请号：US12324523

申请日：2008-11-26

申请人： Fredrik Nordström ,  Niklas Andgart ,  Bengt Lindoff

发明人： Fredrik Nordström ,  Niklas Andgart ,  Bengt Lindoff

IPC分类号： H04L27/28

CPC分类号： H04L5/0007 ,  H04L5/0042 ,  H04L27/2634 ,  H04L27/2647

摘要： A wireless communication system receiver receives and processes a signal comprising at least two component carriers carrying data scheduled to the receiver and having center frequencies spaced apart by at least one component carrier frequency difference. Each component carrier comprises a number of subcarriers spaced apart by a system subcarrier frequency spacing. A common divisor is obtained for the at least one component carrier frequency difference and the system subcarrier frequency spacing. A symbol is received on the subcarriers of the component carriers and downconverted to baseband to produce a baseband symbol. A block of padding values is inserted in the baseband symbol to produce a padded symbol. The length of the block of padding values is such that intermediate subcarriers are inserted to yield a subcarrier frequency spacing for the padded symbol equal to the common divisor. Finally the padded symbol is Fast Fourier Transform, FFT, processed.

摘要翻译： 无线通信系统接收机接收并处理包括至少两个分量载波的信号，所述至少两个分量载波携带调度到接收机的数据，并具有间隔至少一个分量载波频率差的中心频率。 每个分量载波包括通过系统子载波频率间隔间隔开的多个子载波。 获得至少一个分量载波频率差和系统子载波频率间隔的公约数。 在分量载波的子载波上接收符号并且下变频到基带以产生基带符号。 在基带符号中插入填充值块以产生填充符号。 填充值块的长度使得插入中间子载波以产生等于公约数的填充符号的子载波频率间隔。 最后，填充符号是快速傅里叶变换，FFT处理。

公开(公告)号：US09300373B2

公开(公告)日：2016-03-29

申请号：US13527197

申请日：2012-06-19

申请人： Bengt Lindoff ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Fredrik Nordström

IPC分类号： G01R31/08 ,  H04B7/04 ,  H04B7/06 ,  H04L5/00 ,  H04L25/03 ,  H04L25/02

CPC分类号： H04B7/0417 ,  H04B7/0656 ,  H04L5/0023 ,  H04L5/0051 ,  H04L25/0222 ,  H04L25/03343 ,  H04L25/03949

摘要： In a system using spatial precoding, in the event that reliable channel state information is unavailable, a transmitting node artificially creates a randomization of the precoders applied to the transmitted signal. Different precoding vectors are applied to both transmitted data and demodulation reference signals for each of several groups of time-frequency resources, where the precoding vectors vary randomly or pseudo-randomly from each group of time-frequency resources to the next frequency-adjacent group or groups, or to the next time-adjacent group or groups, or both. In an LTE system in particular, this randomization of precoders can be applied at the resource-block level or, at the level of the Precoding Resource block Group (PRG), for example. Thus, the precoders applied to the transmitted signal vary from one PRG to the next, in a random or pseudo-random fashion.

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，发送节点人为地创建应用于发送信号的预编码器的随机化。 不同的预编码矢量被应用于几组时频资源中的每一个的发射数据和解调参考信号，其中预编码矢量随时间或伪随​​机地从每组时频资源变化到下一个频率相邻组，或者 组或下一个与时间相邻的组或组，或两者。 特别地，在LTE系统中，例如，可以在资源块级或预编码资源块组（PRG）的级别应用预编码器的这种随机化。 因此，应用于发射信号的预编码器以随机或伪随机方式从一个PRG到下一个不同。

公开(公告)号：US08520777B2

公开(公告)日：2013-08-27

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

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：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：US08050369B2

公开(公告)日：2011-11-01

申请号：US12324381

申请日：2008-11-26

申请人： Bengt Lindoff ,  Niklas Andgart ,  Fredrik Nordström

发明人： Bengt Lindoff ,  Niklas Andgart ,  Fredrik Nordström

IPC分类号： H04B7/10

CPC分类号： H04L5/0007 ,  H04L5/0041 ,  H04L27/2657 ,  H04L27/2662 ,  H04W56/0035 ,  H04W56/0045

摘要： A receiver receives and front-end processes a plurality of component carrier signals, each carrier spaced apart in frequency. The digitized, baseband component carrier signals are inspected to determine estimates of timing offsets between the carriers. A control unit selects a first component carrier signal having data scheduled to the receiver. If data is scheduled to the receiver on other component carrier signals, the control unit generates timing and frequency offset adjustment control signals to time- and frequency-align each other component carrier signal having relevant data, to the first component carrier signal. All the relevant component carrier signals are then combined, and a single OFDM symbol, spanning all the relevant component carriers, is presented to an FFT for symbol detection.

摘要翻译： 接收机接收和前端处理多个分量载波信号，每个载波频率间隔开。 检查数字化的基带分量载波信号以确定载波之间的定时偏移的估计。 控制单元选择具有被调度给接收机的数据的第一分量载波信号。 如果在其他分量载波信号上将数据调度给接收机，则控制单元产生定时和频率偏移调整控制信号，以将具有相关数据的每个其它分量载波信号时间和频率对齐到第一分量载波信号。 然后组合所有相关的分量载波信号，将跨越所有相关分量载波的单个OFDM符号呈现给用于符号检测的FFT。

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。