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。

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。

公开(公告)号：US20130294551A1

公开(公告)日：2013-11-07

申请号：US13464695

申请日：2012-05-04

申请人： Divaydeep Sikri

发明人： Divaydeep Sikri

IPC分类号： H04L27/06 ,  G06F11/10 ,  H03M13/23 ,  H04W88/02 ,  H04W88/08

CPC分类号： H03M13/41 ,  H03M13/09 ,  H03M13/23 ,  H03M13/3707 ,  H03M13/3723 ,  H04L1/0054

摘要： Decoders and communications devices including such decoders can obtain a convolutional coded bit stream including a plurality of coded data bits. The convolutional coded bit stream may be coded according to one or more generator polynomials such that each information bit is related to two or more coded data bits in a manner to be determinable from a mathematical combination of the two or more coded data bits of the convolutional coded bit stream. A priori information associated with each information bit can be calculated based at least in part on the mathematical combination of the two or more coded data bits. Employing the a priori information, a binary value for each information bit can be calculated. Other aspects, embodiments, and features are also claimed and described.

摘要翻译： 包括这种解码器的解码器和通信设备可以获得包括多个编码数据位的卷积编码比特流。 卷积编码比特流可以根据一个或多个生成多项式进行编码，使得每个信息比特以两个或多个编码数据比特相关，可以从卷积的两个或更多个编码数据比特的数学组合来确定 编码比特流。 可以至少部分地基于两个或更多个编码数据位的数学组合来计算与每个信息位相关联的先验信息。 使用先验信息，可以计算每个信息位的二进制值。 还要求和描述其它方面，实施例和特征。

公开(公告)号：US08576743B2

公开(公告)日：2013-11-05

申请号：US13333550

申请日：2011-12-21

申请人： Divaydeep Sikri ,  Hassan Rafique ,  Cetin Altan

发明人： Divaydeep Sikri ,  Hassan Rafique ,  Cetin Altan

IPC分类号： G01R31/08

CPC分类号： H04L27/22 ,  H04L1/20 ,  H04L2027/0065 ,  H04L2027/0091 ,  H04L2027/0095

摘要： Estimating an unknown frequency error of a tone signal may comprise sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples, and repeatedly, for different frequency offsets: applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; and measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error. Other aspects, embodiments, and features are also claimed and discussed.

摘要翻译： 估计音调信号的未知频率误差可以包括在误差带宽内对包括占据误差带宽的音调信号的无线信号进行采样以产生信号采样，并且针对不同的频率偏移重复采样：对信号采样应用频率偏移 以产生表示占据偏移频带等于误差带宽偏移的偏移带宽的信号的偏移值; 在小于误差带宽的频率估计范围内，使用偏移值估计音调频率误差; 以及使用信号样本和估计的音频误差来测量音调信号的信噪比。 还要求和讨论其它方面，实施例和特征。

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）。

公开(公告)号：US20120327793A1

公开(公告)日：2012-12-27

申请号：US13333550

申请日：2011-12-21

申请人： Divaydeep Sikri ,  Hassan Rafique ,  Cetin Altan

发明人： Divaydeep Sikri ,  Hassan Rafique ,  Cetin Altan

IPC分类号： H04W24/00

CPC分类号： H04L27/22 ,  H04L1/20 ,  H04L2027/0065 ,  H04L2027/0091 ,  H04L2027/0095

摘要： Estimating an unknown frequency error of a tone signal may comprise sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples, and repeatedly, for different frequency offsets: applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; and measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error. Other aspects, embodiments, and features are also claimed and discussed.

摘要翻译： 估计音调信号的未知频率误差可以包括在误差带宽内对包括占据误差带宽的音调信号的无线信号进行采样以产生信号采样，并且针对不同的频率偏移重复采样：对信号采样应用频率偏移 以产生表示占据偏移频带等于误差带宽偏移的偏移带宽的信号的偏移值; 在小于误差带宽的频率估计范围内，使用偏移值估计音调频率误差; 以及使用信号样本和估计的音频误差来测量音调信号的信噪比。 还要求和讨论其它方面，实施例和特征。

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。

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。

公开(公告)号：US20100215128A1

公开(公告)日：2010-08-26

申请号：US12390337

申请日：2009-02-20

申请人： Nico De Laurentiis ,  Divaydeep Sikri ,  Hassan Rafique ,  Lukasz Bednarz ,  Philip Children

发明人： Nico De Laurentiis ,  Divaydeep Sikri ,  Hassan Rafique ,  Lukasz Bednarz ,  Philip Children

IPC分类号： H04L27/22 ,  H04L27/00

CPC分类号： H04L27/0012 ,  H04L1/20

摘要： An apparatus is provided for demodulating a block, the block including a plurality of bursts. The apparatus comprises a demodulator configured to demodulate the plurality of bursts and a modulation detector configured to detect a modulation scheme for a current burst in the plurality of bursts and to determine whether there is a high probability that the detected modulation scheme is correct. The modulation detector instructs the demodulator to demodulate each burst subsequent to the current burst in the plurality of bursts based on the detected modulation scheme when the modulation detector determines a high probability that the modulation scheme is correct.

摘要翻译： 提供了一种用于解调块的装置，该块包括多个突发。 该装置包括：解调器，被配置为解调多个突发;以及调制检测器，被配置为检测多个突发中的当前突发的调制方案，并且确定检测到的调制方案是否是正确的高概率。 当调制检测器确定调制方案是正确的高概率时，调制检测器指示解调器基于检测到的调制方案来解调多个突发中的当前突发之后的每个突发。

公开(公告)号：US08964615B2

公开(公告)日：2015-02-24

申请号：US13605380

申请日：2012-09-06

申请人： Divaydeep Sikri ,  Hassan Rafique ,  Mukund Agarwal

发明人： Divaydeep Sikri ,  Hassan Rafique ,  Mukund Agarwal

IPC分类号： G08C17/00 ,  H04W4/00

CPC分类号： H04W52/0209 ,  H04W52/0229 ,  Y02D70/1224 ,  Y02D70/1226

摘要： Communications devices are adapted to receive a plurality of RF bursts of a radio block, where the plurality of RF bursts includes a number of RF bursts less than a total number of RF bursts for the radio block. A header can be decoded from the received plurality of RF burst. From the decoded header, a determination may be made whether the radio block is intended for the communications device or for another device. According to at least some examples, if the radio block is determined to be intended for another device, at least a portion of a receiver circuit of the communications device can be powered down. Also, according to at least some examples, if the radio block is determined to be intended for the receiving communications device, a data payload of the radio block may be decoded. Other aspects, embodiments, and features are also claimed and described.

摘要翻译： 通信设备适于接收无线电块的多个RF突发，其中多个RF突发包括小于无线电块的RF突发的总数的多个RF突发。 可以从接收到的多个RF突发中解码报头。 从解码的报头，可以确定无线电块是针对通信设备还是针对另一设备。 根据至少一些示例，如果无线电块被确定为旨在用于另一设备，那么通信设备的接收机电路的至少一部分可以掉电。 此外，根据至少一些示例，如果无线电块被确定为旨在用于接收通信设备，则可以对无线电块的数据有效载荷进行解码。 还要求和描述其它方面，实施例和特征。