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：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：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：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：US20060227909A1

公开(公告)日：2006-10-12

申请号：US11233636

申请日：2005-09-23

申请人： John Thomas ,  Michael McCloud ,  Vijay Nagarajan

发明人： John Thomas ,  Michael McCloud ,  Vijay Nagarajan

IPC分类号： H03D1/04 ,  H04B1/10

CPC分类号： H04B1/7107

摘要： A receiver produces optimal weights for cancelling multipath interference. An SINR measurement module generates SINR measurements corresponding to soft symbol estimates produced by a baseband receiver from a received multipath signal. Each soft symbol estimate is replaced with either a hard estimate or a weighted soft estimate based on how each corresponding SINR measurement compares to a predetermined threshold. The received multipath signal and estimated interference signals generated from the hard symbol estimates and/or the weighted soft symbol estimates are combined to produce interference cancelled signals that may be combined via maximum ratio combining to produce an interference-cancelled MRC signal.

摘要翻译： 接收机产生用于消除多路径干扰的最优权重。 SINR测量模块从接收的多路径信号产生对应于由基带接收机产生的软符号估计的SINR测量。 基于每个对应的SINR测量与预定阈值相比较，每个软符号估计被硬估计或加权软估计替代。 将从硬符号估计和/或加权软符号估计产生的所接收的多路径信号和估计干扰信号组合以产生干扰消除的信号，该干扰消除信号可以经由最大比合并来组合以产生干扰消除的MRC信号。

公开(公告)号：US08446975B2

公开(公告)日：2013-05-21

申请号：US13372483

申请日：2012-02-13

申请人： Tommy Guess ,  Michael L McCloud ,  Vijay Nagarajan ,  Gagandeep Singh Lamba

发明人： Tommy Guess ,  Michael L McCloud ,  Vijay Nagarajan ,  Gagandeep Singh Lamba

IPC分类号： H04L1/02

CPC分类号： H04B1/7115 ,  H04B1/71075 ,  H04B1/712 ,  H04B7/0845 ,  H04B7/0894 ,  H04B2201/70702 ,  H04J11/0063

摘要： This invention teaches to the details of an interference suppressing receiver for suppressing intra-cell and inter-cell interference in coded, multiple-access, spread spectrum transmissions that propagate through frequency selective communication channels to a multiplicity of receive antennas. The receiver is designed or adapted through the repeated use of symbol-estimate weighting, subtractive suppression with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be designed, adapted, and implemented explicitly in software or programmed hardware, or implicitly in standard RAKE-based hardware either within the RAKE (i.e., at the finger level) or outside the RAKE (i.e., at the user or subchannel symbol level). Embodiments may be employed in user equipment on the forward link or in a base station on the reverse link. It may be adapted to general signal processing applications where a signal is to be extracted from interference.

公开(公告)号：US08300745B2

公开(公告)日：2012-10-30

申请号：US12731915

申请日：2010-03-25

申请人： Tommy Guess ,  Michael L McCloud ,  Vijay Nagarajan ,  Gagandeep Singh Lamba

发明人： Tommy Guess ,  Michael L McCloud ,  Vijay Nagarajan ,  Gagandeep Singh Lamba

IPC分类号： H03D1/04

CPC分类号： H04B1/7097 ,  H04B1/71075 ,  H04B1/712 ,  H04B2201/70702

摘要： A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimate. Receiver embodiments may be implemented explicitly in software of programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i.e., at the finger level) or outside the Rake (i.e., at the user of subchannel symbol level).

摘要翻译： 接收机被配置为消除通过频率选择性通信信道传播的编码，多址，扩频传输中的小区内和小区间干扰。 接收机采用迭代符号估计加权，具有稳定步长的减法消除和混合判决符号估计。 接收机实施例可以在编程硬件的软件中明确地实现，或者隐含地在Rake（即，在手指级别）处或在Rake外部（即，在子信道符号级别的用户处）的基于标准Rake的硬件中。

公开(公告)号：US20120027138A1

公开(公告)日：2012-02-02

申请号：US13253075

申请日：2011-10-05

申请人： Vijay Nagarajan ,  Louis L. Scharf ,  Anand P. Narayan

发明人： Vijay Nagarajan ,  Louis L. Scharf ,  Anand P. Narayan

IPC分类号： H04L25/08

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：US07991088B2

公开(公告)日：2011-08-02

申请号：US11451685

申请日：2006-06-13

申请人： Tommy Guess ,  Michael L. McCloud ,  Vijay Nagarajan ,  Gagandeep Singh Lamba

发明人： Tommy Guess ,  Michael L. McCloud ,  Vijay Nagarajan ,  Gagandeep Singh Lamba

IPC分类号： H03D1/04

CPC分类号： H04B1/715 ,  H04B1/7107 ,  H04B1/71072 ,  H04B1/71075 ,  H04B1/7115 ,  H04L25/03006 ,  H04L2025/03375

摘要： A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i.e., at the finger level) or outside the Rake (i.e., at the user or subchannel symbol level).

摘要翻译： 接收机被配置为消除通过频率选择性通信信道传播的编码，多址，扩频传输中的小区内和小区间干扰。 接收机采用迭代符号估计加权，具有稳定步长的减法消除和混合判决符号估计。 接收机实施例可以在软件或编程硬件中明确实现，或者隐含地在Rake（即，在手指级）处或Rake外部（即，在用户或子信道符号级别）处于标准Rake的硬件中。