公开(公告)号：US08045600B2

公开(公告)日：2011-10-25

申请号：US12111526

申请日：2008-04-29

Applicant: Douglas A. Cairns ,  Stephen J. Grant ,  Andres Reial ,  Mathias Riback

Inventor： Douglas A. Cairns ,  Stephen J. Grant ,  Andres Reial ,  Mathias Riback

IPC: H04B1/00

CPC classification number: H04B1/712 ,  H04B1/7105 ,  H04B1/7117 ,  H04B2201/709727

Abstract: According to the teachings presented herein, a wireless communication apparatus compensates for timing misalignment in its received signal processing. In at least one embodiment, the apparatus estimates a set of path delays for a received signal and sets processing delays on the estimated path delays. The apparatus jointly hypothesizes combinations of fractional timing offsets for two or more paths, and computes a decision metric for each joint hypothesis that indicates the accuracy of the joint hypothesis. As non-limiting examples, the decision metric may be a signal quality metric, or a distance metric (such as between a measured net channel response and an effective net channel response reconstructed as a function of the combination of fractional timing offsets included in the joint hypothesis). The apparatus evaluates the decision metrics to identify a best estimate of timing misalignment, and correspondingly compensates coherent processing of the received signal.

Abstract translation: 根据本文提出的教导，无线通信装置补偿其接收信号处理中的定时未对准。 在至少一个实施例中，该装置估计接收信号的一组路径延迟并且对所估计的路径延迟设置处理延迟。 该装置共同假设两个或多个路径的分数定时偏移的组合，并且计算指示联合假设的准确性的每个联合假设的决策度量。 作为非限制性示例，决策度量可以是信号质量度量或距离度量（诸如在测量的净信道响应和作为包括在联合中的分数定时偏移的组合的函数中重建的有效网络信道响应之间） 假设）。 设备评估决策度量以识别定时未对准的最佳估计，并相应地补偿接收信号的相干处理。

公开(公告)号：US07929625B2

公开(公告)日：2011-04-19

申请号：US11858706

申请日：2007-09-20

Applicant: Leif Wilhelmsson ,  Andres Reial

Inventor： Leif Wilhelmsson ,  Andres Reial

IPC: H04K1/10

CPC classification number: H04L1/0006 ,  H04L1/0009 ,  H04L1/0018 ,  H04L1/0045 ,  H04L1/0084 ,  H04L1/06

Abstract: Methods and apparatus for use in a multiple-input multiple-output (MIMO) system transmitting a plurality of data substreams to a receiver employing ordered successive interference cancellation detection according to a predetermined sequence for decoding the data substreams. A quality of service (QoS) requirement is determined for each of two or more application-specific data streams, and the application-specific data streams are assigned to the data substreams according to the determined QoS requirements and the predetermined sequence, so that application-specific data streams having more stringent QoS requirements are decoded earlier than application-specific data streams having less stringent QoS requirements. In some embodiments, the determined QoS requirements comprise maximum delay requirements, and application-specific data streams requiring shorter maximum delays are assigned to earlier-decoded data substreams than application-specific data streams having less stringent maximum delay requirements. In other embodiments, the determined QoS requirements comprise an application-specific robustness.

Abstract translation: 在多输入多输出（MIMO）系统中使用的方法和装置，用于根据用于解码数据子流的预定序列，将多个数据子流发送到接收机，采用有序的连续干扰消除检测。 针对两个或多个应用专用数据流中的每一个确定服务质量（QoS）要求，并且根据所确定的QoS要求和预定顺序将特定于应用的数据流分配给数据子流， 具有更严格的QoS要求的特定数据流比具有较不严格的QoS要求的应用程序特定的数据流更早解码。 在一些实施例中，所确定的QoS要求包括最大延迟要求，并且需要较短最大延迟的应用专用数据流被分配给早期解码的数据子流，而不是具有较不严格的最大延迟要求的特定于应用的数据流。 在其他实施例中，确定的QoS要求包括特定于应用的鲁棒性。

公开(公告)号：US20110007793A1

公开(公告)日：2011-01-13

申请号：US12500891

申请日：2009-07-10

Applicant: Douglas A. Cairns ,  Andres Reial ,  Anders Wallen

Inventor： Douglas A. Cairns ,  Andres Reial ,  Anders Wallen

IPC: H04L27/01

CPC classification number: H04L25/03261 ,  H04L25/03235

Abstract: Channel estimation and/or equalization processing is performed in a wireless receiver in two stages. The first stage involves pre-filtering in the frequency domain to compact a grid-based representation of the net channel. The second stage involves implementing reduced-complexity time domain channel estimation and/or equalization. According to one embodiment, a received signal transmitted over a net channel is processed by pre-filtering the received signal in the frequency domain. The frequency domain pre-filtering compacts an N-tap effective grid-based representation of the net channel into a K-tap compacted grid-based representation of the net channel where K

Abstract translation: 信道估计和/或均衡处理在两个阶段中在无线接收机中执行。 第一阶段涉及在频域中进行预滤波以压缩网络通道的基于网格的表示。 第二阶段涉及实现降低复杂度的时域信道估计和/或均衡。 根据一个实施例，通过净频道发送的接收信号通过对频域中的接收信号进行预滤波来处理。 频域预滤波将网络通道的N抽头有效网格表示压缩为K

公开(公告)号：US07852902B2

公开(公告)日：2010-12-14

申请号：US11241680

申请日：2005-09-30

Applicant: Andres Reial ,  Peter Malm

Inventor： Andres Reial ,  Peter Malm

IPC: H04B1/00

CPC classification number: H04B1/712 ,  H04B1/7117 ,  H04B2201/70701 ,  H04B2201/709727

Abstract: A method for use in receiving a spread-spectrum signal includes receiving an input signal. The input signal includes a first plurality of multipath components. The method also includes despreading the first plurality of multipath components. The step of despreading includes computing a plurality of corresponding delays. The method also includes computing a plurality of combining weights based, at least in part, on interference correlation between at least two of the first plurality of multipath components, selecting, according to at least one criterion, a subset of the plurality of combining weights, and despreading and combining a second plurality of multipath components using at least one quantity related to the selected plurality of combining weights and a plurality of delays and multipath components corresponding to the plurality of selected combining weights. This Abstract is provided to comply with rules requiring an Abstract that allows a searcher or other reader to quickly ascertain subject matter of the technical disclosure. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract translation: 一种用于接收扩频信号的方法包括接收输入信号。 输入信号包括第一多个多径分量。 该方法还包括解扩第一多个多路径分量。 解扩的步骤包括计算多个对应的延迟。 该方法还包括至少部分地基于第一多个多径分量中的至少两个之间的干扰相关来计算多个组合加权，根据至少一个准则，选择多个组合权重的子集， 以及使用与所选择的多个组合权重相关的至少一个数量和对应于所述多个选择的组合权重的多个延迟和多径分量来解扩和组合第二多个多径分量。 提供本摘要以符合要求摘要的规则，允许搜索者或其他读者快速确定技术公开内容的主题。 提交本摘要的理解是，它不会用于解释或限制权利要求的范围或含义。

公开(公告)号：US07826515B2

公开(公告)日：2010-11-02

申请号：US10558613

申请日：2004-05-14

Applicant: Andres Reial

Inventor： Andres Reial

IPC: H04B1/00

CPC classification number: H04B1/7113 ,  H04B1/7117

Abstract: Multipath components of a signal transmitted through a time-varying digital radio channel are received with individual delays (τ) within a range (τ1 . . . τM) of possible delay values. The individual delays are estimated and a delay profile (g(τi)) calculated repetitively. The method comprises searching repetitively for new multipath components in a search window constituting a subset of the possible delays, and positioning the search window based on a previous delay profile (g(τi)). For each of a number of search window positions (k) a sum of power is determined for the multipath components located in the search window with that position, and the position of the search window is selected based on the determined sums of power. In this way the multipath detection is less influenced by the noise floor, and it is also effective for channels having a wide delay spread and/or significantly time-varying delay profiles.

Abstract translation: 通过时变数字无线电信道发送的信号的多路径分量在可能的延迟值的范围（τ1...τM）内以各自的延迟（τ）被接收。 估计各个延迟并重复计算延迟分布（g（τi））。 该方法包括在构成可能延迟的子集的搜索窗口中重复搜索新的多径分量，以及基于先前的延迟分布（g（τi））定位搜索窗口。 对于多个搜索窗口位置（k）中的每一个，针对位于具有该位置的搜索窗口中的多路径分量确定功率总和，并且基于确定的功率总和来选择搜索窗口的位置。 以这种方式，多路径检测较少受本底噪声的影响，并且对于具有宽延迟扩展和/或显着时变延迟分布的信道也是有效的。

公开(公告)号：US20100208847A1

公开(公告)日：2010-08-19

申请号：US12371971

申请日：2009-02-17

Applicant: Andres Reial ,  Bengt Lindoff

Inventor： Andres Reial ,  Bengt Lindoff

IPC: H04L27/06 ,  H04L25/08 ,  H04L27/28 ,  H04J11/00 ,  H04B1/10

CPC classification number: H04L27/265 ,  H04J11/0063 ,  H04L25/03159 ,  H04L27/2662

Abstract: A received OFDM signal is processed to determine a plurality of reference delays, which may include the path delays of a multipath channel. The effective channel estimates corresponding to each reference delay are determined, as is the covariance of the ISI and noise components observed at each delay. Combining weights resulting in maximum post-combining SINR are determined for all subcarriers. A corresponding plurality of FFTs is applied to the incoming sample stream, one at each of the reference delays. The individual subcarriers from each FFT output are then combined using the combining weights. This produces a single FFT output with suppressed ISI, which is used in further processing.

Abstract translation: 处理接收的OFDM信号以确定多个参考延迟，其可以包括多径信道的路径延迟。 确定对应于每个参考延迟的有效信道估计，以及在每个延迟时观察到的ISI和噪声分量的协方差。 为所有子载波确定导致最大后组合SINR的权重。 将相应的多个FFT应用于输入的采样流，每个参考延迟中的一个。 然后使用组合权重组合来自每个FFT输出的各个子载波。 这产生具有抑制ISI的单个FFT输出，用于进一步处理。

公开(公告)号：US20100098194A1

公开(公告)日：2010-04-22

申请号：US12252860

申请日：2008-10-16

Applicant: Andres Reial

Inventor： Andres Reial

IPC: H04L27/06 ,  H04B1/10

CPC classification number: H04L25/0328 ,  H04B1/71072 ,  H04L25/03292 ,  H04L25/03318 ,  H04L25/067

Abstract: A computationally-simplified approach to expected symbol value determination is based on classifying soft bit information corresponding to symbols in a received communication signal as being reliable or unreliable, and computing expected symbol values for the symbols based on the classified soft bit information. Classification can be carried out by “quantizing” the soft bit information to coarsely indicate whether individual symbol bits are known with high or low probability. Using quantized soft bit information greatly simplifies expected symbol value calculation, yet the calculated values still reflect a scaling corresponding to the underlying reliability of the soft bit information. Where the expected symbol values are computed for interfering symbols in a composite signal that also includes desired signals, preserving the underlying reliability knowledge in this manner effectively scales the amount interference cancellation applied to the composite signal in dependence on the reliability to which the interfering signal values are known.

Abstract translation: 预期符号值确定的计算简化方法是基于对应于接收到的通信信号中的符号的软比特信息进行分类为可靠或不可靠的，并且基于分类的软比特信息来计算符号的期望符号值。 可以通过“量化”软比特信息来粗略地指示单个符号比特是以高还是低概率已知的分类。 使用量化的软比特信息大大简化了预期的符号值计算，但是所计算的值仍然反映与软比特信息的潜在可靠性相对应的缩放。 在对包含期望信号的复合信号中的干扰符号进行计算的期望符号值的情况下，以这种方式保留潜在可靠性知识有效地根据干扰信号值的可靠性来有效地缩放施加到复合信号的干扰消除量 已知

公开(公告)号：US20090080557A1

公开(公告)日：2009-03-26

申请号：US11858706

申请日：2007-09-20

Applicant: Leif Wilhelmsson ,  Andres Reial

Inventor： Leif Wilhelmsson ,  Andres Reial

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04L1/0006 ,  H04L1/0009 ,  H04L1/0018 ,  H04L1/0045 ,  H04L1/0084 ,  H04L1/06

Abstract: The teachings presented herein provide methods and apparatus for use in a multiple-input multiple-output (MIMO) system transmitting a plurality of data substreams to a receiver employing ordered successive interference cancellation detection according to a predetermined sequence for decoding the data substreams. In an exemplary method, a quality of service (QoS) requirement is determined for each of two or more application-specific data streams, and the application-specific data streams are assigned to the data substreams according to the determined QoS requirements and the predetermined sequence, so that application-specific data streams having more stringent QoS requirements are decoded earlier than application-specific data streams having less stringent QoS requirements. In some embodiments, the determined QoS requirements comprise maximum delay requirements, and application-specific data streams requiring shorter maximum delays are assigned to earlier-decoded data substreams than application-specific data streams having less stringent maximum delay requirements. In other embodiments, the determined QoS requirements comprise an application-specific robustness, wherein application-specific data streams corresponding to less robust applications are assigned to earlier-decoded data substreams than application-specific data streams corresponding to more robust applications.

Abstract translation: 本文提出的教导提供了用于在多输入多输出（MIMO）系统中使用的方法和装置，该多输入多输出（MIMO）系统根据用于解码数据子流的预定顺序将有序的连续干扰消除检测发送到接收机。 在一个示例性方法中，针对两个或多个应用特定数据流中的每一个确定服务质量（QoS）要求，并且根据所确定的QoS要求和预定顺序将应用专用数据流分配给数据子流 ，使得具有更严格的QoS要求的特定于应用的数据流比具有较不严格的QoS要求的特定于应用的数据流更早地解码。 在一些实施例中，所确定的QoS要求包括最大延迟要求，并且需要较短最大延迟的应用专用数据流被分配给早期解码的数据子流，而不是具有较不严格的最大延迟要求的特定于应用的数据流。 在其他实施例中，所确定的QoS要求包括特定于应用的鲁棒性，其中对应于较不健壮的应用的特定应用的数据流被分配给比较强健应用的应用特定数据流更早解码的数据子流。

公开(公告)号：US20080310562A1

公开(公告)日：2008-12-18

申请号：US11762982

申请日：2007-06-14

Applicant: Andres Reial ,  Girum Alebachew ,  Elias Jonsson

Inventor： Andres Reial ,  Girum Alebachew ,  Elias Jonsson

IPC: H03K5/01

CPC classification number: H04B1/712 ,  H04B2201/709727

Abstract: The impairment processor described herein uses a look-up table operation to reduce the computational complexity associated with determining an impairment correlation between first and second sample streams for an interference rejection receiver. One exemplary impairment processor iteratively computes multiple partial impairment correlations based on values selected from look-up table(s), and combines the partial impairment correlations to obtain a final impairment correlation between the first and second sample streams. During each iteration, the impairment processor computes a pair of delay offsets corresponding to the respective processing and path delays of the first and second sample streams, computes an index value as a function of a difference between the pair of delay offsets, selects a pre-computed value from the look-up table based on the index value, determines a pulse correlation estimate based on the selected pre-computed value, and determines the partial impairment correlation for that iteration based on the pulse correlation estimate.

Abstract translation: 本文描述的损害处理器使用查找表操作来减少与确定用于干扰抑制接收机的第一和第二采样流之间的损害相关性相关联的计算复杂度。 一个示例性损伤处理器基于从查找表中选择的值迭代地计算多个部分损伤相关性，并组合部分损伤相关性以获得第一和第二样本流之间的最终损害相关性。 在每次迭代期间，损害处理器计算与第一和第二采样流的相应处理和路径延迟相对应的一对延迟偏移，计算作为一对延迟偏移之间的差的函数的索引值， 基于该索引值从查找表计算的值，基于所选择的预先计算的值确定脉冲相关估计，并且基于脉冲相关估计确定该迭代的部分损伤相关性。

公开(公告)号：US20080151969A1

公开(公告)日：2008-06-26

申请号：US11675214

申请日：2007-02-15

Applicant: Andres Reial

Inventor： Andres Reial

IPC: H04B7/02 ,  H04B7/08

CPC classification number: H04B1/7113 ,  H04B1/7117 ,  H04B7/0811 ,  H04B17/327 ,  H04B17/364

Abstract: An instantaneous power density profile (PDP) is generated by dynamically switching between signals from two or more antennae, each for a variable number of signal samples. A variable number NC of samples are correlated with a known chip code, the correlations phase-coherently accumulated, and a number NNC of such coherent accumulations is accumulated non-coherently for each of a plurality of delay values. The parameters considered in determining the dynamic switching pattern may include values of NC and NNC, how often and at which point in the PDP generation process to switch between antennae, and other factors, such as the velocity of a transmitter. The coherent accumulations from each antenna may be weighted in response to the signal quality of the respective antenna, and the weighted coherent accumulations accumulated non-coherently.

Abstract translation: 通过在两个或更多个天线的信号之间动态切换产生瞬时功率密度分布（PDP），每个天线的每一个用于可变数量的信号样本。 样本的可变数N C C与已知芯片码相关，相干累加的相关性和这种相干累积的数量N N N N非相干地累积 对于多个延迟值中的每一个。 在确定动态切换模式时考虑的参数可以包括N N C和N N NC的值，PDP生成过程中在天线和 其他因素，如发射机的速度。 来自每个天线的相干累加可以响应于相应天线的信号质量而加权，并且加权相干累加非相干地累积。