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1. 发明授权

US08831149B2 Symbol estimation methods and apparatuses 有权
标题翻译：符号估计方法和装置
公开(公告)号：US08831149B2
公开(公告)日：2014-09-09
申请号：US12553855
申请日：2009-09-03
申请人： Bahadir Canpolat , Farrokh Abrishamkar , Divaydeep Sikri
发明人： Bahadir Canpolat , Farrokh Abrishamkar , Divaydeep Sikri
IPC分类号： H04L27/06 , H04L25/03
CPC分类号： H04L25/03178 , H04L25/0328
摘要： A novel symbol estimation method produces intersymbol interference free symbols by detecting interfering symbols in an interfering channel. A channel estimate is refined for additional improvements. The method can lends itself as a serial or parallel algorithm implementation. The symbol estimation method includes using an initial estimate of received symbols and calculating a refined estimate of the received symbols using a channel estimate. The refined estimate is calculated by performing parameterization of intersymbol interference by symbols other than the symbol being refined and selecting a refined value for the symbol being refined by evaluating an optimization function. Symbol estimates are refined in multiple iterations, until a predetermined iteration termination criterion is met. Parameterization of ISI contribution of other symbols results in reduced computation by reducing total number of unknown variables in the refinement operation.
摘要翻译：新颖的符号估计方法通过检测干扰信道中的干扰符号来产生符号间无干扰码元。改进渠道估算值以进行其他改进。该方法可以作为串行或并行算法实现。符号估计方法包括使用接收到的符号的初始估计并使用信道估计来计算接收到的符号的精细估计。精确估计是通过对符号进行改进的符号进行符号间干扰的参数化来计算的，并通过评估优化函数来选择要精炼的符号的精细值。符号估计在多个迭代中被精炼，直到满足预定的迭代终止标准。其他符号的ISI贡献的参数化导致通过减少细化操作中未知变量的总数来减少计算。

2. 发明授权

US08396440B2 Signal reception method and apparatus for non-stationary channels 有权
标题翻译：用于非固定信道的信号接收方法和装置
公开(公告)号：US08396440B2
公开(公告)日：2013-03-12
申请号：US12820958
申请日：2010-06-22
申请人： Bahadir Canpolat , Ming Yan , Farrokh Abrishamkar , Divaydeep Sikri
发明人： Bahadir Canpolat , Ming Yan , Farrokh Abrishamkar , Divaydeep Sikri
IPC分类号： H04B1/10
CPC分类号： H04L25/0328 , H04L25/0242 , H04L25/03292 , H04L2025/03726
摘要： A signal reception method includes receiving a signal over a channel, producing a first equalized signal, a first interference suppression filter and a first estimate of the channel using a portion of a the received signal, dividing the received signal into a plurality of signal blocks, and for each one of the plurality of signal blocks, producing a second equalized signal using a portion of the first equalized signal by selecting from one of a linear estimator or a non-linear estimator and estimating symbols received in the one of the plurality of signal blocks based on the second equalized signal.
摘要翻译：信号接收方法包括通过信道接收信号，使用接收信号的一部分产生第一均衡信号，第一干扰抑制滤波器和信道的第一估计，将接收信号分成多个信号块，并且对于所述多个信号块中的每一个，使用所述第一均衡信号的一部分，通过从线性估计器或非线性估计器之一中选择并估计在所述多个信号中的一个信号中接收的符号来产生第二均衡信号基于第二均衡信号的块。

3. 发明授权

US08331504B2 Method and system for multi-user interference cancellation 失效
标题翻译：多用户干扰消除的方法和系统
公开(公告)号：US08331504B2
公开(公告)日：2012-12-11
申请号：US12435076
申请日：2009-05-04
申请人： Yingqun Yu , Farrokh Abrishamkar , Divaydeep Sikri , Michael McCloud
发明人： Yingqun Yu , Farrokh Abrishamkar , Divaydeep Sikri , Michael McCloud
IPC分类号： H03D1/04
CPC分类号： H04B1/7107 , H04B1/71052 , H04B2201/70701
摘要： Systems and methods for multi-user interference cancellation are provided. In one aspect of the disclosure, 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 detection unit configured to detect user symbols from the received symbols. The apparatus also comprises an interference cancellation unit configured to compute multi-user interference using the detected user symbols and to remove the computed multi-user interference from the received symbols. The apparatus further comprises a redetection unit configured to redetect user symbols from the received symbols with the computed multi-user interference removed.
摘要翻译：提供了多用户干扰消除的系统和方法。在本公开的一个方面，提供一种装置。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;以及检测单元，被配置为从接收的符号检测用户符号。该装置还包括被配置为使用检测到的用户符号来计算多用户干扰并从所接收的符号中去除所计算的多用户干扰的干扰消除单元。所述设备还包括重新检测单元，其被配置为从所接收的符号中重新检测用户符号，同时移除所计算的多用户干扰。

4. 发明申请

US20110051864A1 MULTI-STAGE INTERFERENCE SUPPRESSION 失效
标题翻译：多级干扰抑制
公开(公告)号：US20110051864A1
公开(公告)日：2011-03-03
申请号：US12553848
申请日：2009-09-03
申请人： Raghu N. Chalia , Bahadir Canpolat , Farrokh Abrishamkar , Divaydeep Sikri
发明人： Raghu N. Chalia , Bahadir Canpolat , Farrokh Abrishamkar , Divaydeep Sikri
IPC分类号： H04B1/10
CPC分类号： H04L25/0328 , H04L25/0202 , H04L25/03286 , H04L25/03292 , H04L25/03299 , H04L2025/03726
摘要： A multi-stage interference suppression receiver includes a short equalizer section configured to operate on a first portion of a received signal received over a channel to produce a first equalized signal and a first estimate of the channel, a channel estimator section configured to operate on the first equalized signal to produce a second equalized signal, the channel estimator section comprising a linear estimator and a non-linear estimator, a long equalizer section configured to operate on a second portion of the received signal to produce a first estimate of symbols in the received signal and a second estimate of the channel and an interference canceller section configured to operate on the first estimate of symbols in the received signal to generate a second estimate of symbols in the received signal based on, at least in part, the second estimate of the channel.
摘要翻译：多级干扰抑制接收机包括短均衡器部分，其被配置为对通过信道接收的接收信号的第一部分进行操作以产生第一均衡信号和信道的第一估计，信道估计器部分被配置为在第一均衡信号以产生第二均衡信号，所述信道估计器部分包括线性估计器和非线性估计器，长均衡器部分，被配置为在所接收信号的第二部分上操作以产生所接收的符号的第一估计值信号和信道的第二估计以及干扰消除器部分，被配置为在接收信号中对符号的第一估计进行操作，以至少部分地基于接收信号的第二估计来生成接收信号中的符号的第二估计渠道。

5. 发明申请

US20100046595A1 SEMI-COHERENT TIMING PROPAGATION FOR GERAN MULTISLOT CONFIGURATIONS 失效
标题翻译：用于GERAN MULTISLOT配置的半密钥时序传播
公开(公告)号：US20100046595A1
公开(公告)日：2010-02-25
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： H04B17/00
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。

6. 发明授权

US08675796B2 Interference cancellation under non-stationary conditions 失效
标题翻译：非平稳条件下的干扰消除
公开(公告)号：US08675796B2
公开(公告)日：2014-03-18
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 , H04L27/00
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。

7. 发明申请

US20130128942A1 ADVANCED INTERFERENCE CANCELLATION FOR PRECODED GSM EDGE RADIO ACCESS NETWORK (GERAN) 有权
标题翻译：高级干扰消除用于预付费GSM边缘无线接入网络（GERAN）
公开(公告)号：US20130128942A1
公开(公告)日：2013-05-23
申请号：US13477288
申请日：2012-05-22
申请人： Divaydeep Sikri , Farrokh Abrishamkar , Bahadir Canpolat
发明人： Divaydeep Sikri , Farrokh Abrishamkar , Bahadir Canpolat
IPC分类号： H04B7/005
CPC分类号： H04B7/005 , H04L25/022 , H04L25/03012 , H04L25/03159 , H04L25/03821
摘要： An interference cancellation receiver for a pre-coded orthogonal frequency division multiplexed (OFDM) based system combines temporal interference cancellation within the OFDM framework. Multi-path equalization and inter-symbol interference (ISI) cancellation are performed on a time domain channel estimate of a received signal. An output from the multi-path equalization is transformed to the frequency domain. Inter-channel interference (ICI) is performed in the frequency domain on an equalized signal from the multi-path equalization after transforming the equalized signal from the time domain to the frequency domain.
摘要翻译：用于基于预编码的正交频分复用（OFDM））系统的干扰消除接收机在OFDM框架内组合时间干扰消除。对接收信号的时域信道估计执行多径均衡和码间干扰（ISI）消除。来自多路径均衡的输出被转换到频域。在将均衡信号从时域变换到频域之后，在来自多路径均衡的均衡信号的频域中执行信道间干扰（ICI）。

8. 发明申请

US20110051859A1 SYMBOL ESTIMATION METHODS AND APPARATUSES 有权
标题翻译：符号估计方法和装置
公开(公告)号：US20110051859A1
公开(公告)日：2011-03-03
申请号：US12553855
申请日：2009-09-03
申请人： Bahadir Canpolat , Farrokh Abrishamkar , Divaydeep Sikri
发明人： Bahadir Canpolat , Farrokh Abrishamkar , Divaydeep Sikri
IPC分类号： H04L27/06
CPC分类号： H04L25/03178 , H04L25/0328
摘要： A novel symbol estimation method produces intersymbol interference free symbols by detecting interfering symbols in an interfering channel. A channel estimate is refined for additional improvements. The method can lends itself as a serial or parallel algorithm implementation. The symbol estimation method includes using an initial estimate of received symbols and calculating a refined estimate of the received symbols using a channel estimate. The refined estimate is calculated by performing parameterization of intersymbol interference by symbols other than the symbol being refined and selecting a refined value for the symbol being refined by evaluating an optimization function. Symbol estimates are refined in multiple iterations, until a predetermined iteration termination criterion is met. Parameterization of ISI contribution of other symbols results in reduced computation by reducing total number of unknown variables in the refinement operation.
摘要翻译：新颖的符号估计方法通过检测干扰信道中的干扰符号来产生符号间无干扰码元。改进渠道估算值以进行其他改进。该方法可以作为串行或并行算法实现。符号估计方法包括使用接收到的符号的初始估计并使用信道估计来计算接收到的符号的精细估计。精确估计是通过对符号进行改进的符号进行符号间干扰的参数化来计算的，并通过评估优化函数来选择要精炼的符号的精细值。符号估计在多个迭代中被精炼，直到满足预定的迭代终止标准。其他符号的ISI贡献的参数化导致通过减少细化操作中未知变量的总数来减少计算。

9. 发明申请

US20100278218A1 METHOD AND SYSTEM FOR MULTI-USER INTERFERENCE CANCELLATION 失效
标题翻译：用于多用户干扰消除的方法和系统
公开(公告)号：US20100278218A1
公开(公告)日：2010-11-04
申请号：US12435076
申请日：2009-05-04
申请人： Yingqun Yu , Farrokh Abrishamkar , Divaydeep Sikri , Michael McCloud
发明人： Yingqun Yu , Farrokh Abrishamkar , Divaydeep Sikri , Michael McCloud
IPC分类号： H04B1/707 , H04B1/10
CPC分类号： H04B1/7107 , H04B1/71052 , H04B2201/70701
摘要： Systems and methods for multi-user interference cancellation are provided. In one aspect of the disclosure, 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 detection unit configured to detect user symbols from the received symbols. The apparatus also comprises an interference cancellation unit configured to compute multi-user interference using the detected user symbols and to remove the computed multi-user interference from the received symbols. The apparatus further comprises a redetection unit configured to redetect user symbols from the received symbols with the computed multi-user interference removed.
摘要翻译：提供了多用户干扰消除的系统和方法。在本公开的一个方面，提供一种装置。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;以及检测单元，被配置为从接收的符号检测用户符号。该装置还包括被配置为使用检测到的用户符号来计算多用户干扰并从所接收的符号中去除所计算的多用户干扰的干扰消除单元。所述设备还包括重新检测单元，其被配置为从所接收的符号中重新检测用户符号，同时移除所计算的多用户干扰。

10. 发明授权

US08774261B2 Soft linear and non-linear interference cancellation 失效
标题翻译：软线性和非线性干扰消除
公开(公告)号：US08774261B2
公开(公告)日：2014-07-08
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： H03H7/30
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。

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