公开(公告)号：US20050180364A1

公开(公告)日：2005-08-18

申请号：US11100935

申请日：2005-04-07

申请人： Vijay Nagarajan ,  Louis Scharf ,  John Thomas

发明人： Vijay Nagarajan ,  Louis Scharf ,  John Thomas

IPC分类号： H04B7/216 ,  H04K1/00

CPC分类号： H04B1/7107 ,  H04B7/0678 ,  H04B7/086 ,  H04B2001/71077 ,  H04K3/228

摘要： Interference cancellation is performed in a CDMA receiver by projecting a received signal onto a subspace that is orthogonal to a signal selected for removal. An interference matrix or a combined interference vector is used to construct an interference-canceling projection operator. Confidence weights may be provided to components of the interference matrix or the interference vector based on estimation errors or relative strengths of interfering signals. Complexity reduction of the orthogonal projection operator may be achieved by providing for simplifying approximations that remove terms and operations. A linear transformation operator may be applied to the rows and/or columns of the interference matrix or the interference vector prior to construction of the orthogonal projection. Interference cancellation techniques may be configured for processing signals in a transmit-diversity system or a receive-diversity system using time and/or frequency-domain implementations and space and/or wave-number implementations of the transceiver.

摘要翻译： 通过将接收的信号投影到与选择去除的信号正交的子空间上，在CDMA接收机中进行干扰消除。 干扰矩阵或组合干扰矢量用于构建干扰消除投影算子。 可以基于干扰信号的估计误差或相对强度将置信度提供给干扰矩阵的分量或干扰矢量。 正交投影算子的复杂度降低可以通过提供简化的除去术语和操作的近似来实现。 在构造正交投影之前，可以将线性变换算子应用于干涉矩阵或干涉矢量的行和/或列。 干扰消除技术可以被配置用于在发射分集系统或接收分集系统中使用时间和/或频域实现以及收发器的空间和/或波数实现来处理信号。

公开(公告)号：US20070263704A1

公开(公告)日：2007-11-15

申请号：US11432580

申请日：2006-05-11

申请人： Vijay Nagarajan ,  Louis Scharf ,  Anand Narayan

发明人： Vijay Nagarajan ,  Louis Scharf ,  Anand Narayan

IPC分类号： H04B1/00

CPC分类号： H04B1/7107 ,  H04B1/712 ,  H04B2201/70703 ,  H04B2201/709727

摘要： A receiver employs low-rate processing to synthesize the effect of high-rate interference in a received multi-rate signal. Each high-rate subchannel is analyzed on its low-rate descendents to produce symbol estimates for each low-rate symbol interval. The symbol estimates are applied to low-rate descendent subchannels, which are then combined to synthesize the effects of the high-rate interference. An interference canceller processes the synthesized interference with the received signal for producing an interference-cancelled signal. Alternatively, analogous steps may be applied at high-rate to analyze, synthesize, and cancel the effects of low-rate interference in a multi-rate signal.

摘要翻译： 接收机采用低速率处理来合成接收的多速率信号中的高速率干扰的影响。 在其低速率后代分析每个高速率子信道，以对每个低速率符号间隔产生符号估计。 符号估计适用于低速率后代子信道，然后将其合并，以合成高速率干扰的影响。 干扰消除器处理与接收信号的合成干扰以产生干扰消除信号。 或者，可以以高速率应用类似的步骤来分析，合成和消除多速率信号中的低速率干扰的影响。

公开(公告)号：US20100238981A1

公开(公告)日：2010-09-23

申请号：US12727880

申请日：2010-03-19

申请人： Vijay Nagarajan ,  Louis Scharf ,  Anami P. Narayan

发明人： Vijay Nagarajan ,  Louis Scharf ,  Anami P. Narayan

IPC分类号： H04B1/00

CPC分类号： H04B1/7107 ,  H04B1/712 ,  H04B2201/70703 ,  H04B2201/709727

摘要： A receiver employs low-rate processing to synthesize the effect of high-rate interference in a received multi-rate signal. Each high-rate subchannel is analyzed on its low-rate descendents to produce symbol estimates for each low-rate symbol interval. The symbol estimates are applied to low-rate descendent subchannels, which are then combined to synthesize the effects of the high-rate interference. An interference canceller processes the synthesized interference with the received signal for producing an interference-cancelled signal. Alternatively, analogous steps may be applied at high-rate to analyze, synthesize, and cancel the effects of low-rate interference in a multi-rate signal.

摘要翻译： 接收机采用低速率处理来合成接收的多速率信号中的高速率干扰的影响。 在其低速率后代分析每个高速率子信道，以对每个低速率符号间隔产生符号估计。 符号估计适用于低速率后代子信道，然后将其合并，以合成高速率干扰的影响。 干扰消除器处理与接收信号的合成干扰以产生干扰消除信号。 或者，可以以高速率应用类似的步骤来分析，合成和消除多速率信号中的低速率干扰的影响。

公开(公告)号：US20070025299A1

公开(公告)日：2007-02-01

申请号：US11192763

申请日：2005-07-29

申请人： Louis Scharf ,  Vijay Nagarajan

发明人： Louis Scharf ,  Vijay Nagarajan

IPC分类号： H04B7/216

CPC分类号： H04B1/7107

摘要： The receiver includes a Rake receiver for separating a received signal into multipath components, an interference selector for selecting interference symbols corresponding to interfering paths and subchannels, a synthesizer for synthesizing an interference signal from selected paths and estimated subchannel symbols, and a canceller for constructing a projection operator or a scale-invariant subtraction operator to cancel selected interference in multipath components of the received signal, or from the received signal itself. The interference canceller may use a sequence of symbol estimates to simultaneously cancel inter-channel interference and inter-symbol interference. Interference cancellers may be placed at one or more locations within the receiver chain.

摘要翻译： 接收机包括用于将接收到的信号分离为多路径分量的Rake接收机，用于选择对应于干扰路径和子信道的干扰符号的干扰选择器，用于合成来自所选路径的干扰信号的合成器和估计的子信道符号，以及用于构建 投影运算符或缩放不变减法运算符，以消除接收信号的多路径分量中的选定干扰，或从接收信号本身。 干扰消除器可以使用符号估计序列来同时消除信道间干扰和符号间干扰。 干扰消除器可以放置在接收器链中的一个或多个位置处。

公开(公告)号：US20060227908A1

公开(公告)日：2006-10-12

申请号：US11204606

申请日：2005-08-15

申请人： Louis Scharf ,  Vijay Nagarajan

发明人： Louis Scharf ,  Vijay Nagarajan

IPC分类号： H04B1/10

CPC分类号： H04B1/126 ,  H04B1/1027 ,  H04B1/1081 ,  H04B1/7105 ,  H04B1/7107 ,  H04B1/7117 ,  H04B1/712 ,  H04B7/0678 ,  H04B7/0891 ,  H04B2001/1045 ,  H04B2201/70719 ,  H04B2201/70979 ,  H04J13/0022 ,  H04J13/20

摘要： A multi-mode receiver includes a channel decomposition module (e.g., a Rake receiver) for separating a received signal into multipath components, an interference selector for selecting interfering paths and subchannels, a synthesizer for synthesizing interference signals from selected subchannel symbol estimates, and an interference canceller for cancelling selected interference in the received signal. At least one of the channel decomposition module, the synthesizer, and the interference canceller are configurable for processing multi-mode signals.

摘要翻译： 多模式接收机包括用于将接收到的信号分离为多路径分量的信道分解模块（例如，Rake接收机），用于选择干扰路径和子信道的干扰选择器，用于合成来自所选子信道符号估计的干扰信号的合成器，以及 干扰消除器，用于消除所接收信号中的选定干扰。 信道分解模块，合成器和干扰消除器中的至少一个可配置用于处理多模信号。

公开(公告)号：US20160156652A1

公开(公告)日：2016-06-02

申请号：US13564335

申请日：2012-08-01

申请人： RANDY PAFFENROTH ,  Philip Du Toit ,  Louis Scharf

发明人： RANDY PAFFENROTH ,  Philip Du Toit ,  Louis Scharf

IPC分类号： H04L29/06

CPC分类号： H04L63/1425

摘要： A method of detecting an anomaly in a sensor network for diagnosing a network attack may include receiving a data set comprising a plurality of vector-valued measurements from a plurality of sensors, and decomposing the data set into a low-rank component L and a sparse component S using an Augmented Lagrange Multiplier (ALM) method. In one embodiment, at least one of L or S can be determined using an exact minimizer of a Lagrangian in the ALM method, L can represent patterns that occur in a relatively large number of the plurality of sensors, and S can represent patterns that occur in a relatively small number of the plurality of sensors. The method may also include ascertaining, using the computer system, the anomaly in the data set based on the patterns in the sparse component S.

摘要翻译： 一种检测传感器网络中用于诊断网络攻击的异常的方法可以包括从多个传感器接收包括多个向量值测量的数据集，并且将数据集分解为低等级分量L和稀疏 使用增强拉格朗日乘数（ALM）方法的分量S。 在一个实施例中，可以使用ALM方法中的拉格朗日精确最小值来确定L或S中的至少一个，L可以表示在相对大量的多个传感器中发生的模式，并且S可以表示出现的模式 在相对较少数量的多个传感器中。 该方法还可以包括基于稀疏分量S中的模式来确定使用计算机系统数据集中的异常。

公开(公告)号：US20070036202A1

公开(公告)日：2007-02-15

申请号：US11374485

申请日：2006-03-13

申请人： Hongya Ge ,  Louis Scharf

发明人： Hongya Ge ,  Louis Scharf

IPC分类号： H04B1/00

CPC分类号： H04B1/71052 ,  H04B1/71055 ,  H04B2201/70703 ,  H04B2201/709709

摘要： A system and method are disclosed that substantially reduce the complexity of receivers in digitally modulated wireless communication systems such as systems that use CDMA and similar multi-access coding. Transmitted signals are designed to use orthogonal or non-orthogonal codes with specific amplitudes that reduce the number of distinct eigenvalues in a code correlation matrix or in a code-plus-interference-plus-noise correlation matrix, so that a few steps of a conjugate direction calculation will compute a reduced rank Wiener filter that can be used to provide approximate de-correlation type receivers in a substantially reduced number of steps when compared to inverse correlation matrix calculations, or when compared to conjugate direction computations run on correlation matrices with un-shaped eigenvalues. These techniques can also be applied to active or passive imaging systems such as sonar, ultrasound and radar imaging systems and phased array systems that use beam forming. Cancellation of interference and noise can also be accomplished by exploiting eigenvalue shape or by designing the codes and amplitudes of the transmitted signal and using the reduced rank Wiener filter to filter interference and noise from the receive signal. The techniques enable the use of code design and power control for the control of system complexity and bandwidth.

摘要翻译： 公开了一种系统和方法，其显着地降低了数字调制的无线通信系统中的接收机的复杂性，例如使用CDMA和类似的多址编码的系统。 传输信号被设计为使用具有特定幅度的正交或非正交码，其减少码相关矩阵中的不同特征值的数量，或者在码加上干扰加噪声相关矩阵中，使得偶数个步骤 方向计算将计算一个降级维纳滤波器，当与反相关矩阵计算相比时，可以用于以基本上减少的步数提供近似去相关类型的接收机，或者当与在相关矩阵上运行的共轭方向计算进行比较时， 形特征值。 这些技术也可以应用于主动或被动成像系统，例如声纳，超声波和雷达成像系统以及使用波束成形的相控阵列系统。 干扰和噪声的消除也可以通过利用特征值形状或通过设计发射信号的码和幅度并使用降级维纳滤波器来滤除来自接收信号的干扰和噪声来实现。 这些技术使得能够使用代码设计和功率控制来控制系统的复杂性和带宽。

公开(公告)号：US20060153283A1

公开(公告)日：2006-07-13

申请号：US11035141

申请日：2005-01-13

申请人： Louis Scharf ,  Steve Shattil

发明人： Louis Scharf ,  Steve Shattil

IPC分类号： H04B1/707 ,  H04B1/713

CPC分类号： H04B1/7107 ,  H04L2025/03414

摘要： A receiver in a wireless communication system comprises a reverse transform configured to produce a vector of baseband signal values, and a projection canceller configured to project the vector of baseband signal values onto at least one subspace that is substantially orthogonal to an interference subspace. The reverse transform may be adjoint to a forward transform employed by at least one transmitter in the wireless communication system. The combination of interference cancellation with one or more receiver operations may be a substantially adjoint operation relative to one or more transmitter operators and channel-propagation effects. The reverse transform may include a Fourier transform, a wavelet transform, or any other well known invertible transforms. Reverse transforms may include spread-spectrum multiple-access coding and may be implemented in systems configured to perform single-input, multiple output or multiple-input, multiple-output operations. Interference components may be selected in a projection canceller relative to predetermined ratios of interference in the received signal.

摘要翻译： 无线通信系统中的接收机包括被配置为产生基带信号值的向量的反向变换，以及投影消除器，被配置为将基带信号值的向量投影到基本上与干扰子空间正交的至少一个子空间。 反向变换可以与无线通信系统中的至少一个发射机所采用的正向变换相连。 干扰消除与一个或多个接收机操作的组合可以是相对于一个或多个发射机操作员和信道传播效应的基本上伴随的操作。 反向变换可以包括傅里叶变换，小波变换或任何其他公知的可逆变换。 反向变换可以包括扩频多址编码，并且可以在被配置为执行单输入，多输出或多输入多输出操作的系统中实现。 可以在投影消除器中相对于接收信号中的预定干扰比率来选择干扰分量。

公开(公告)号：US20070110135A1

公开(公告)日：2007-05-17

申请号：US11475458

申请日：2006-08-28

申请人： Tommy Guess ,  Michael McCloud ,  Louis Scharf

发明人： Tommy Guess ,  Michael McCloud ,  Louis Scharf

IPC分类号： H04B1/00 ,  H04L1/02 ,  H04B1/10

CPC分类号： H04L1/0631 ,  H04L1/0048 ,  H04L1/005 ,  H04L5/023 ,  H04L25/0328 ,  H04L27/2647

摘要： An OFDMA-MIMO receiver performs a recursive interference cancellation across several correlated subbands and several receive antenna elements to demodulate complex source symbols for several users that have been coded across several subbands and transmit antennas. The iterative parallel interference canceller (PIC) is configured to work in the presence of both spatial and frequency structure introduced by the transmitter space-frequency mapping and the actual frequency selective wireless channel. The interference canceller uses mixed decisions, confidence weights, and stabilizing step sizes in a PIC receiver, which may be used with a successive decoding architecture in a receiver that employs a combination of modulation level interference cancellation with successive decoding.

摘要翻译： OFDMA-MIMO接收机在几个相关子带和若干接收天线元件之间执行递归干扰消除，以解调多个已经在多个子带和发射天线上编码的用户的复数源符号。 迭代并行干扰消除器（PIC）被配置为在存在由发射机空间频率映射和实际频率选择性无线信道引入的空间和频率结构的情况下工作。 干扰消除器在PIC接收机中使用混合决策，置信权重和稳定步长，其可以与采用调制级干扰消除与连续解码的组合的接收机中的连续解码架构一起使用。