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21.发明授权Determining a frequency error in a receiver of a wireless communications system 有权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
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。
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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。
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23.发明授权公开(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。
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24.发明授权公开(公告)号：US09179396B2
公开(公告)日：2015-11-03
申请号：US13384440
申请日：2011-11-09
申请人： Jianfeng Wang , Matthias Kamuf , Shaohua Li , Fredrik Nordström
发明人： Jianfeng Wang , Matthias Kamuf , Shaohua Li , Fredrik Nordström
IPC分类号： H04W48/16 , H04L5/00 , H04L27/26 , H04W84/04 , H04J11/00 , H04W24/08 , H04B7/04 , H04W52/00 , H04W72/00
CPC分类号： H04W48/16 , H04B7/022 , H04B7/04 , H04B7/0413 , H04B17/318 , H04J11/005 , H04L5/0023 , H04L5/0035 , H04L5/005 , H04L25/022 , H04L25/0224 , H04L27/2602 , H04L27/2656 , H04L27/2666 , H04W24/08 , H04W52/00 , H04W72/00 , H04W84/045
摘要： A method for detecting an Almost-Blank Subframe (ABS) configuration for an interfering macro cell of a heterogeneous network is implemented in a wireless terminal. For one or more resource blocks in a received signal, a first power metric is calculated as a function of channel response estimates determined for predicted cell-specific (or common) reference signal (CRS) resource element locations in a plurality of symbols. For the one or more resource blocks in the received signal, a second power metric is calculated as a function of channel response estimates determined for the predicted CRS resource element locations in a single one of the plurality of symbols. A difference between the first and second power metrics is compared to a threshold, and responsive to the comparison a determination is made as to whether the macro cell is operating in a Multicast and Broadcast Single Frequency Network (MBSFN) mode or a non-MBSFN mode.
摘要翻译： 在无线终端中实现用于检测异构网络的干扰宏小区的几乎空白子帧（ABS）配置的方法。 对于接收信号中的一个或多个资源块，根据为多个符号中的预测小区特定（或公共）参考信号（CRS）资源元素位置确定的信道响应估计值来计算第一功率量度。 对于接收信号中的一个或多个资源块，计算第二功率量度作为对于多个符号中的单个符号中的预测CRS资源元素位置确定的信道响应估计的函数。 将第一和第二功率度量之间的差异与阈值进行比较，并且响应于比较，确定宏小区是否以组播和广播单频网络（MBSFN）模式或非MBSFN模式操作 。
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公开(公告)号：US20110026415A1
公开(公告)日：2011-02-03
申请号：US12642027
申请日：2009-12-18
CPC分类号： H04W72/0453 , H04W72/082
摘要： Methods and apparatus in a frequency division duplex, orthogonal frequency division multiplex communication system assign resources, including the number, frequency position, and coding, in a subframe of a downlink to a user equipment (UE) based on parameters that influence the robustness against UE self-induced interference when the UE is scheduled for uplink transmission in that subframe.
摘要翻译： 频分双工中的方法和装置，正交频分多路复用通信系统基于影响对UE的鲁棒性的参数，将下行链路的子帧中的数量，频率位置和编码分配给用户设备（UE） 当UE被调度用于该子帧中的上行链路传输时，自感应干扰。
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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。
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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
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。
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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
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。
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29.发明授权Detecting a transmitted OFDM signal in a receiver having at least two receiver branches 有权在具有至少两个接收器分支的接收机中检测发送的OFDM信号公开(公告)号：US08953698B2
公开(公告)日：2015-02-10
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
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; 以及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，确定组合信道估计，以及从加权和和组合信道估计检测接收到的数据符号。
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公开(公告)号：US20140200020A1
公开(公告)日：2014-07-17
申请号：US14238221
申请日：2012-07-05
申请人： Bengt Lindoff , Fredrik Nordström
发明人： Bengt Lindoff , Fredrik Nordström
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。
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