公开(公告)号：US06829485B2

公开(公告)日：2004-12-07

申请号：US09955521

申请日：2001-09-12

申请人： Farrokh Abrishamkar ,  Mark Roh

发明人： Farrokh Abrishamkar ,  Mark Roh

IPC分类号： H04Q720

CPC分类号： H04W68/00 ,  H04B1/7075 ,  H04B1/7115 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04W52/028 ,  H04W68/025 ,  Y02D70/40

摘要： A system determines if a primary paging channel should be received based on an examination of a quick paging channel. A first QPCH symbol is examined (102) and the normalized pilot energy is determined (104). If the normalized pilot energy is above a first threshold (106), the symbol is demodulated and the QPCH-symbol-to-pilot-energy ratio is determined (110) and compared against another threshold (112). If the normalized pilot energy is below the first threshold, the system proceeds to the second QPCH symbol immediately. Depending on the resulting values, a second QPCH signal is examined (108), the system sleeps (114), or the system decides (116) to process the primary paging channel directly (118). If the second signal is demodulated, and if its normalized pilot energy is high enough, it also is demodulated and the ratio of the sum-of-the-combined-QPCH-symbols to the sum-of-the-combined-pilot-energies is determined (122). If this ratio exceeds a threshold (124), the primary paging channel is processed (118); otherwise the system sleeps (114).

摘要翻译： 系统基于快速寻呼信道的检查来确定是否应该接收主寻呼信道。 检查第一QPCH符号（102）并且确定归一化导频能量（104）。 如果归一化的导频能量高于第一阈值（106），则对该符号进行解调并且确定QPCH符号到导频能量比（110）并与另一阈值（112）进行比较。 如果归一化的导频能量低于第一阈值，则系统立即进入第二QPCH符号。 根据得到的值，检查第二QPCH信号（108），系统休眠（114），或者系统决定（116）直接处理主寻呼信道（118）。 如果第二信号被解调，并且如果其归一化导频能量足够高，则其也被解调，并且组合QPCH符号之和与组合导频能量之和的比率 确定（122）。 如果该比率超过阈值（124），则处理主寻呼信道（118）; 否则系统睡眠（114）。

公开(公告)号：US06771616B2

公开(公告)日：2004-08-03

申请号：US09952722

申请日：2001-09-13

申请人： Farrokh Abrishamkar ,  Mark Roh

发明人： Farrokh Abrishamkar ,  Mark Roh

IPC分类号： H04Q100

CPC分类号： H04W68/00 ,  H04B1/7075 ,  H04B1/7115 ,  H04B2201/70701 ,  H04W52/0216 ,  H04W52/0219 ,  H04W52/0245 ,  Y02D70/40

摘要： A system determines if a primary paging channel should be received based on an examination of a quick paging channel. A first QPCH symbol is examined (102) and the normalized pilot energy is determined (104). If the normalized pilot energy is above a first threshold (106), the symbol is demodulated and the QPCH-symbol-to-pilot-energy ratio is determined (110) and compared against another threshold (114). If the normalized pilot energy is below the first threshold, the system proceeds to the second QPCH symbol immediately. Based on the two comparisons, a second QPCH signal is examined (108) or the system sleeps (116). If the second signal is examined, and if its normalized pilot energy is high enough, it also is demodulated and the ratio of the sum-of-the-combined-QPCH-symbols to the sum-of-the-combined-pilot-energies is determined (122). If this ratio exceeds a threshold (124), the primary paging channel is processed (120); otherwise the system sleeps (116).

摘要翻译： 系统基于快速寻呼信道的检查来确定是否应该接收主寻呼信道。 检查第一QPCH符号（102）并且确定归一化导频能量（104）。 如果归一化的导频能量高于第一阈值（106），则对该符号进行解调，并且确定QPCH符号到导频能量比（110）并与另一个阈值进行比较（114）。 如果归一化的导频能量低于第一阈值，则系统立即进入第二QPCH符号。 基于两个比较，检查第二QPCH信号（108）或系统睡眠（116）。 如果检测到第二信号，并且如果其归一化导频能量足够高，则其也被解调，并且组合QPCH符号之和与组合导频能量之和的比率 确定（122）。 如果该比率超过阈值（124），则处理主寻呼信道（120）; 否则系统睡眠（116）。

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。