公开(公告)号：US09160577B2

公开(公告)日：2015-10-13

申请号：US12433200

申请日：2009-04-30

申请人： Divaydeep Sikri ,  Farrokh Abrishamkar ,  Nico De Laurentiis

发明人： Divaydeep Sikri ,  Farrokh Abrishamkar ,  Nico De Laurentiis

IPC分类号： H03H7/30 ,  H04L25/03

CPC分类号： H04L25/03292 ,  H04L2025/03426

摘要： Systems and methods of receiving data in a communication system are disclosed. The methods include equalizing a plurality of samples to suppress intersymbol interference and provide a first set of detected bits based on a first set of reference bits comprising a training sequence on a first iteration. The methods further include suppressing co-channel interference in the plurality of input samples and provide a set of suppressed samples based on a second set of reference bits comprising the first set of detected bits on a second iteration. The methods further include equalizing the set of suppressed samples to suppress intersymbol interference and provide a second set of detected bits based on the second set of reference bits on the second iteration.

摘要翻译： 公开了在通信系统中接收数据的系统和方法。 所述方法包括均衡多个采样以抑制符号间干扰，并且基于在第一次迭代中包括训练序列的第一组参考比特来提供第一组检测到的比特。 所述方法还包括抑制多个输入样本中的同信道干扰，并且在第二次迭代中基于包括第一组检测到的比特的第二组参考比特提供一组抑制样本。 所述方法还包括均衡所述抑制样本集合以抑制符号间干扰，并且基于所述第二迭代上的第二组参考比特提供第二组检测到的比特。

公开(公告)号：US08599677B2

公开(公告)日：2013-12-03

申请号：US12435114

申请日：2009-05-04

申请人： Wenjun Li ,  Yingqun Yu ,  Farrokh Abrishamkar ,  Divaydeep Sikri ,  Insung Kang

发明人： Wenjun Li ,  Yingqun Yu ,  Farrokh Abrishamkar ,  Divaydeep Sikri ,  Insung Kang

IPC分类号： H04J11/00

CPC分类号： H04B1/71052

摘要： Systems and methods for multi-user detection in a multiple access system are provided. In one aspect, an apparatus is provided. The apparatus comprises a processing unit configured to process received chips into received symbols for a plurality of users and a computation unit configured to compute a multi-user matrix using a Hadamard matrix, wherein the multi-user matrix relates user symbols for the plurality of users to the received symbols. The apparatus further comprises a detection unit configured to detect the user symbols for the plurality of users using the received symbols and the computed multi-user matrix.

摘要翻译： 提供了一种用于多访问系统中多用户检测的系统和方法。 一方面，提供了一种装置。 该装置包括：处理单元，被配置为将接收到的码片处理为多个用户的接收符号;以及计算单元，被配置为使用哈达玛矩阵来计算多用户矩阵，其中多用户矩阵涉及多个用户的用户符号 到收到的符号。 所述装置还包括检测单元，被配置为使用所接收的符号和所计算的多用户矩阵来检测所述多个用户的用户符号。

公开(公告)号：US08509293B2

公开(公告)日：2013-08-13

申请号：US12193925

申请日：2008-08-19

申请人： Divaydeep Sikri ,  Erdogan Dede ,  Farrokh Abrishamkar ,  Philip J. C. Children ,  Nico De Laurentiis

发明人： Divaydeep Sikri ,  Erdogan Dede ,  Farrokh Abrishamkar ,  Philip J. C. Children ,  Nico De Laurentiis

IPC分类号： H04B3/46

CPC分类号： H04W56/00 ,  H04L7/041 ,  H04L25/0228 ,  H04L25/0328

摘要： A method for estimating timing in a wireless communication comprises the steps of receiving a plurality of symbol bursts corresponding to a plurality of time slots and selecting a subset of symbols from a first symbol burst of the plurality of symbol bursts. The subset comprises a first midamble symbol. The method further comprises the steps of calculating, for each symbol in the subset, a corresponding midamble estimation error, and determining the lowest calculated midamble estimation error to determine a timing for the first symbol burst. The method further comprises the steps of processing the first symbol burst utilizing the timing determined for the first symbol burst, and processing a second symbol burst of the plurality of symbol bursts utilizing the timing determined for the first symbol burst.

摘要翻译： 一种用于估计无线通信定时的方法包括以下步骤：接收与多个时隙相对应的多个符号突发，并从所述多个符号突发的第一符号突发中选择符号子集。 子集包括第一中间码符号。 所述方法还包括以下步骤：针对所述子集中的每个符号计算相应的中间码估计误差，以及确定所计算出的最低中值码估计误差以确定所述第一符号突发的定时。 该方法还包括以下步骤：利用为第一符号突发确定的定时来处理第一符号突发，以及利用为第一符号突发确定的定时来处理多个符号突发的第二符号突发。

公开(公告)号：US08503591B2

公开(公告)日：2013-08-06

申请号：US12193995

申请日：2008-08-19

申请人： Divaydeep Sikri ,  Farrokh Abrishamkar ,  Michael McCloud

发明人： Divaydeep Sikri ,  Farrokh Abrishamkar ,  Michael McCloud

IPC分类号： H04B1/10

CPC分类号： H04W56/00

摘要： A method for suppressing interference in a wireless communication is provided. The method comprises receiving a burst of symbols, generating a plurality of timing hypotheses for the burst of symbols, and calculating, for each timing hypothesis, a plurality of weights for an interference suppression filter based upon a subset of the burst of symbols. The method further comprises, for each timing hypothesis, filtering the subset of the burst of symbols using the interference suppression filter with the corresponding plurality of weights, and selecting one of the plurality of timing hypotheses corresponding to a selection criteria. The method further comprises equalizing and decoding the filtered burst of symbols based upon the selected one of the plurality of timing hypotheses.

摘要翻译： 提供了一种用于抑制无线通信中的干扰的方法。 该方法包括：接收符号脉冲串，产生符号脉冲串的多个定时假设，以及基于符号脉冲串的子集，针对每个时序假设计算干扰抑制滤波器的多个权重。 该方法还包括对于每个时序假设，使用具有对应的多个权重的干扰抑制滤波器对符号突发的子集进行滤波，并且选择与选择标准相对应的多个定时假设之一。 该方法还包括基于所选择的多个定时假设之一来均衡和解码经过滤波的符号突发。

公开(公告)号：US20130148711A1

公开(公告)日：2013-06-13

申请号：US13493203

申请日：2012-06-11

申请人： Farrokh Abrishamkar ,  Divaydeep Sikri ,  Ken Delgado

发明人： Farrokh Abrishamkar ,  Divaydeep Sikri ,  Ken Delgado

IPC分类号： H04L27/01

CPC分类号： H04L27/01 ,  H04L25/0202 ,  H04L25/03012

摘要： A two stage interference cancellation (IC) process includes a linear IC stage that suppresses co-channel interference (CCI) and adjacent channel interference (ACI). The linear IC stage disambiguates otherwise super-trellis data for non-linear cancellation. Soft linear IC processing is driven by a-posteriori probability (Apop) information. A second stage performs expectation maximization/Baum Welch (EM-BW) processing that reduces residual ISI left over from the first stage and also generates the Apop which drives the soft linear IC in an iterative manner.

摘要翻译： 两级干扰消除（IC）处理包括抑制同信道干扰（CCI）和相邻信道干扰（ACI）的线性IC级。 线性IC阶段消除了非线性消除的超网格数据。 软线性IC处理由后验概率（Apop）信息驱动。 第二级执行预期最大化/ Baum Welch（EM-BW）处理，其减少从第一级剩余的剩余ISI，并且还产生以迭代方式驱动软线性IC的Apop。

公开(公告)号：US20110319045A1

公开(公告)日：2011-12-29

申请号：US13100987

申请日：2011-05-04

申请人： Wenjun Li ,  Farrokh Abrishamkar ,  Srikanth Gummadi

发明人： Wenjun Li ,  Farrokh Abrishamkar ,  Srikanth Gummadi

IPC分类号： H04B1/10

CPC分类号： H04L25/0204 ,  H04L1/1832 ,  H04L5/0007 ,  H04L5/0051 ,  H04L25/0224 ,  H04L25/0242 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03624

摘要： Interference cancellation at a user equipment includes performing channel estimation for each component of an aggregate received signal using at least one received midamble of at least one time slot. The aggregate received signal is received from at least one Node B. A combined channel is computed for each channelization code based on the channel estimation. A linear transfer function is obtained for all user equipment within a cell. This linear transfer function includes a combined channel for each channelization code. An equalization matrix is derived from the linear transfer function and then applied to the aggregate received signal to obtain the component intended for the user equipment.

摘要翻译： 在用户设备处的干扰消除包括使用至少一个接收到的至少一个时隙的中间码来对聚合接收信号的每个分量进行信道估计。 从至少一个节点B接收聚合的接收信号。基于信道估计为每个信道化码计算组合信道。 为单元内的所有用户设备获得线性传递函数。 该线性传递函数包括用于每个信道化码的组合信道。 均衡矩阵从线性传递函数导出，然后应用于聚合接收信号，以获得用于用户设备的组件。

公开(公告)号：US20110305303A1

公开(公告)日：2011-12-15

申请号：US13215984

申请日：2011-08-23

申请人： Divaydeep Sikri ,  Farrokh Abrishamkar ,  Ming Yan ,  Nico De Laurentiis

发明人： Divaydeep Sikri ,  Farrokh Abrishamkar ,  Ming Yan ,  Nico De Laurentiis

IPC分类号： H04B1/10 ,  H04L27/06

CPC分类号： H04W56/00 ,  H04B7/02

摘要： A method for timing and frequency synchronization in a wireless system is provided. The method comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols, iteratively adjusting the subset of the burst of symbols by a plurality of timing offsets and calculating, for each timing offset, a first performance metric corresponding to the adjusted subset. The method further comprises the steps of determining one of the plurality of timing offsets to be a preferred timing offset based upon the first performance metric thereof, iteratively rotating the subset of the burst of symbols by a plurality of frequency offsets and calculating, for each frequency offset, a second performance metric corresponding to the rotated subset, and determining one of the plurality of frequency offsets to be a preferred frequency offset based upon the second performance metric thereof.

摘要翻译： 提供了一种用于无线系统中的定时和频率同步的方法。 该方法包括以下步骤：接收符号脉冲串，选择符号脉冲串的子集，通过多个定时偏移迭代地调整符号脉冲串的子集，并且针对每个定时偏移量，计算对应于 调整后的子集。 该方法还包括以下步骤：基于其第一性能度量，将多个定时偏移中的一个定时偏移确定为优选的定时偏移，将符号突发的子集迭代地旋转多个频率偏移，并且针对每个频率 偏移量，对应于旋转的子集的第二性能量度，以及基于其第二性能度量，将所述多个频率偏移中的一个确定为优选频率偏移。

公开(公告)号：US20110286507A1

公开(公告)日：2011-11-24

申请号：US12950435

申请日：2010-11-19

申请人： Yingqun Yu ,  Farrokh Abrishamkar ,  Ni-Chun Wang ,  Ori Shental

发明人： Yingqun Yu ,  Farrokh Abrishamkar ,  Ni-Chun Wang ,  Ori Shental

IPC分类号： H04W24/00

CPC分类号： H04L25/0234 ,  H04L5/0048 ,  H04L25/0242 ,  H04L27/2607

摘要： An apparatus and method for channel estimation comprising determining a channel impulse response using a Taylor series expansion with a plurality of Taylor series coefficients; determining a channel frequency response based on the channel impulse response; collecting the channel frequency response over a plurality of symbols to obtain a composite channel frequency response; generating a sensing matrix based on the Taylor series expansion; and determining the plurality of Taylor series coefficients based on the composite channel frequency response and the sensing matrix using compressive sensing channel estimation.

摘要翻译： 一种用于信道估计的装置和方法，包括使用具有多个泰勒级数系数的泰勒级数展开来确定信道脉冲响应; 基于信道脉冲响应确定信道频率响应; 在多个符号上收集信道频率响应以获得复合信道频率响应; 基于泰勒级数展开产生感测矩阵; 以及基于所述复合信道频率响应和所述感测矩阵使用压缩感测信道估计来确定所述多个泰勒级数系数。

公开(公告)号：US07933256B2

公开(公告)日：2011-04-26

申请号：US12038724

申请日：2008-02-27

申请人： Farrokh Abrishamkar ,  Divaydeep Sikri

发明人： Farrokh Abrishamkar ,  Divaydeep Sikri

IPC分类号： H04J3/06

CPC分类号： H04L7/042 ,  H04L7/048 ,  H04L25/0228

摘要： A method for midamble estimation comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols that comprises a first midamble symbol, calculating, for each symbol in the subset, a corresponding midamble estimation error, and determining the lowest calculated midamble estimation error to locate the first midamble symbol. A receiver comprises an antenna configured to receive a burst of symbols, a timing estimator configured to select a subset of the burst of symbols that comprises a first midamble symbol, a midamble estimator configured to calculate, for each symbol in the subset, a corresponding midamble estimation error, and a processor configured to select the symbol in the subset corresponding to a lowest calculated midamble estimation error as the first midamble symbol.

摘要翻译： 一种用于中间码估计的方法包括以下步骤：接收符号脉冲串，选择包括第一中间码符号的符号突发的子集，为该子集中的每个符号计算相应的中间码估计误差，以及确定最低计算 中间码估计误差来定位第一个midamble符号。 接收机包括被配置为接收符号突发的天线，定时估计器，被配置为选择包括第一中间码符号的符号突发的子集，中间码估计器，被配置为针对子集中的每个符号计算相应的中间码 估计误差，以及被配置为选择对应于最低计算的中间码估计误差的子集中的符号作为第一中间码符号的处理器。

公开(公告)号：US07929652B2

公开(公告)日：2011-04-19

申请号：US11733646

申请日：2007-04-10

申请人： Farrokh Abrishamkar ,  Mariam Motamed ,  Parvathanathan Subrahmanya

发明人： Farrokh Abrishamkar ,  Mariam Motamed ,  Parvathanathan Subrahmanya

IPC分类号： H03D1/04 ,  H03K9/00

CPC分类号： H04L25/0228

摘要： Techniques for performing adaptive channel estimation are described. A receiver derives channel estimates for a wireless channel based on received pilot symbols and at least one estimation parameter. The receiver updates the at least one estimation parameter based on the received pilot symbols. The at least one estimation parameter may be for an innovations representation model of the wireless channel and may be updated based on a cost function with costs defined by prediction errors. In one design, the receiver derives predicted pilot symbols based on the received pilot symbols and the at least one estimation parameter, determines prediction errors based on the received pilot symbols and the predicted pilot symbols, and further derives error gradients based on the prediction errors. The receiver then updates the at least one estimation parameter based on the error gradients and the prediction errors, e.g., if a stability test is satisfied.

摘要翻译： 描述用于执行自适应信道估计的技术。 接收机基于接收的导频符号和至少一个估计参数导出无线信道的信道估计。 接收机基于接收的导频符号来更新至少一个估计参数。 所述至少一个估计参数可以是针对无线信道的创新表示模型，并且可以基于具有由预测误差定义的成本的成本函数来更新。 在一种设计中，接收器基于接收到的导频符号和至少一个估计参数导出预测的导频符号，基于接收到的导频符号和预测的导频符号来确定预测误差，并且还基于预测误差导出误差梯度。 然后，接收器基于误差梯度和预测误差来更新至少一个估计参数，例如，如果满足稳定性测试。