公开(公告)号：WO2011028978A3

公开(公告)日：2011-04-28

申请号：PCT/US2010047775

申请日：2010-09-03

Applicant: QUALCOMM INC ,  ABRISHAMKAR FARROKH ,  SIKRI DIVAYDEEP ,  CHALLA RAGHU N ,  CANPOLAT BAHADIR

Inventor： ABRISHAMKAR FARROKH ,  SIKRI DIVAYDEEP ,  CHALLA RAGHU N ,  CANPOLAT BAHADIR

IPC: H04L25/03 ,  H04L25/02

CPC classification number: H04L25/0328 ,  H04L25/0202 ,  H04L25/03286 ,  H04L25/03292 ,  H04L25/03299 ,  H04L2025/03726

Abstract: 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.

Abstract translation: 一种多级干扰抑制接收机，包括：短均衡器部分，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，被配置为对 第一均衡信号以产生第二均衡信号，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，被配置为对接收信号的第二部分进行操作以产生接收到的符号的第一估计 信号和信道的第二估计，以及干扰消除器部分，被配置为对接收信号中的符号的第一估计进行操作，以至少部分地基于第二估计来生成接收信号中的符号的第二估计 渠道。

公开(公告)号：WO2009108586A3

公开(公告)日：2009-12-03

申请号：PCT/US2009034794

申请日：2009-02-20

Applicant: QUALCOMM INC ,  ABRISHAMKAR FARROKH ,  SIKRI DIVAYDEEP

Inventor： ABRISHAMKAR FARROKH ,  SIKRI DIVAYDEEP

IPC: H04L7/04 ,  H04L25/02

CPC classification number: H04L7/042 ,  H04L7/048 ,  H04L25/0228

Abstract: 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.

Abstract translation: 一种中同步码估计方法，包括以下步骤：接收符号突发;选择包括第一中间码符号的符号突发的子集;针对该子集中的每个符号计算相应的中间码估计误差;以及确定计算出的最低 中间码估计错误以定位第一中间码符号。 接收机包括：天线，被配置为接收符号突发;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，被配置为针对该子集中的每个码元计算对应的中间码 估计误差;以及处理器，被配置为选择对应于最低计算的中间训练码估计误差的子集中的码元作为第一中间码符号。

公开(公告)号：WO2011028982A3

公开(公告)日：2011-04-28

申请号：PCT/US2010047781

申请日：2010-09-03

Applicant: QUALCOMM INC ,  CANPOLAT BAHADIR ,  ABRISHAMKAR FARROKH ,  SIKRI DIVAYDEEP

Inventor： CANPOLAT BAHADIR ,  ABRISHAMKAR FARROKH ,  SIKRI DIVAYDEEP

IPC: H04L25/03

CPC classification number: H04L25/03178 ,  H04L25/0328

Abstract: 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 pre-determined 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.

Abstract translation: 一种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符号。 信道估计值可以进一步改进。 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且使用信道估计来计算所接收的符号的精炼估计。 精化估计是通过用符号以外的符号对符号间干扰进行参数化来计算的，并且通过评估优化函数为正在精化的符号选择精确值。 符号估计在多次迭代中被完善，直到符合预先确定的迭代终止标准。 通过减少细化操作中的未知变量的总数，其他符号的ISI贡献的参数化导致减少的计算。

公开(公告)号：WO2008061123A3

公开(公告)日：2008-11-13

申请号：PCT/US2007084641

申请日：2007-11-14

Applicant: QUALCOMM INC ,  SHIM BYONGHYO ,  KANG INYUP ,  ABRISHAMKAR FARROKH ,  SAMBHWANI SHARAD DEEPAK

Inventor： SHIM BYONGHYO ,  KANG INYUP ,  ABRISHAMKAR FARROKH ,  SAMBHWANI SHARAD DEEPAK

IPC: H04B1/707 ,  H04L25/03

CPC classification number: H04L25/03006 ,  H04B1/71072 ,  H04L2025/03617

Abstract: Techniques for recovering a desired transmission in the presence of interfering transmissions are described. For successive equalization and cancellation (SEC), equalization is performed on a received signal to obtain an equalized signal for a first set of code channels. The first set may include all code channels for one sector, a subset of all code channels for one sector, multiple code channels for multiple sectors, etc. Data detection is then performed on the equalized signal to obtain a detected signal for the first set of code channels. A signal for the first set of code channels is reconstructed based on the detected signal. The reconstructed signal for the first set of code channels is then canceled from the received signal. Equalization, data detection, reconstruction, and cancellation are performed for at least one additional set of code channels in similar manner.

Abstract translation: 描述了在存在干扰传输的情况下恢复期望的传输的技术。 对于连续均衡和消除（SEC），对接收信号执行均衡以获得第一组码信道的均衡信号。 第一组可以包括用于一个扇区的所有码信道，用于一个扇区的所有码信道的子集，用于多个扇区的多个码信道等等。然后对均衡后的信号执行数据检测以获得用于第一组 代码通道。 基于检测到的信号重建第一组代码信道的信号。 然后从接收的信号中消除第一组代码信道的重构信号。 均衡，数据检测，重构和消除是以类似的方式对至少一个附加代码信道集合执行的。

公开(公告)号：WO2010127049A2

公开(公告)日：2010-11-04

申请号：PCT/US2010032858

申请日：2010-04-28

Applicant: QUALCOMM INC ,  SIKRI DIVAYDEEP ,  ABRISHAMKAR FARROKH ,  DE LAURENTIIS NICO

Inventor： SIKRI DIVAYDEEP ,  ABRISHAMKAR FARROKH ,  DE LAURENTIIS NICO

IPC: H04B1/10 ,  H04B15/00

CPC classification number: H04L25/03292 ,  H04L2025/03426

Abstract: 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.

Abstract translation: 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：WO02061453A3

公开(公告)日：2003-02-13

申请号：PCT/US0204991

申请日：2002-01-31

Applicant: QUALCOMM INC

Inventor： WILBORN THOMAS BRIAN ,  PATEL SHIMMAN ,  SIH GILBERT C ,  ABRISHAMKAR FARROKH

IPC: G01S11/02 ,  G01S19/25 ,  G01S19/26

CPC classification number: G01S11/02

Abstract: A velocityx estimate is determined from a recevied signal by counting the number of times a signal in one multipath crosses a predetermined threshold in a given amount of time. A signal is received and a single multipath is extracted from the received signal. Instantaneous envelope values of the extracted multipath are calculated. A plurality of the instantaneous envelope valures are used to calculate a running RMS value. A level crossing threshold is determined using the running RMS value. The number of times the instantaneous envelope value crosses the level crossing threshold is counted. The number of level crossings is mapped to a velocity estimate.

Abstract translation: 通过计算一个多径中的信号在给定的时间量内跨越预定阈值的次数，从接收信号确定速度估计。 接收信号并从接收信号中提取单个多路径。 计算提取的多路径的瞬时包络值。 多个瞬时包络线被用于计算正在运行的RMS值。 使用正在运行的RMS值来确定级别交叉阈值。 计算瞬时包络值跨越等级交叉阈值的次数。 级别交叉点的数量映射到速度估计。

公开(公告)号：WO2009140338A3

公开(公告)日：2010-05-06

申请号：PCT/US2009043718

申请日：2009-05-13

Applicant: QUALCOMM INC ,  SIKRI DIVAYDEEP ,  ABRISHAMKAR FARROKH ,  YAN MING ,  DE LAURENTIIS NICO

Inventor： SIKRI DIVAYDEEP ,  ABRISHAMKAR FARROKH ,  YAN MING ,  DE LAURENTIIS NICO

IPC: H04B7/01 ,  H04L7/00 ,  H04W56/00

CPC classification number: H04W56/00 ,  H04B7/02

Abstract: 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.

Abstract translation: 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：WO2008124766A2

公开(公告)日：2008-10-16

申请号：PCT/US2008059750

申请日：2008-04-09

Applicant: QUALCOMM INC ,  ABRISHAMKAR FARROKH ,  MOTAMED MARIAM ,  SUBRAHMANYA PARVATHANATHAN

Inventor： ABRISHAMKAR FARROKH ,  MOTAMED MARIAM ,  SUBRAHMANYA PARVATHANATHAN

IPC: H04L25/02

CPC classification number: H04L25/0228

Abstract: 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.

Abstract translation: 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，接收机基于接收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。

公开(公告)号：WO0154430A3

公开(公告)日：2001-12-20

申请号：PCT/US0101614

申请日：2001-01-17

Applicant: QUALCOMM INC ,  ABRISHAMKAR FARROKH

Inventor： ABRISHAMKAR FARROKH

IPC: H04B1/707 ,  H04B1/7075 ,  H04B1/7115 ,  H04W52/02 ,  H04W68/00 ,  H04W68/02

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

Abstract: An efficient system for determining if a primary paging channel should be received and processed via a wireless communications device based on a quick paging channel in a wireless communications system supporting a quick paging channel and a primary paging channel. The system includes a first mechanism for receiving an electromagnetic signal having both pilot signal and quick paging signal components. A second mechanism ascertains whether a second symbol of the quick paging channel signal should be immediately analyzed based on a first quality parameter, a second quality parameter, and a first decision metric associated with a first symbol of the quick paging signal, and provides a first indication in response thereto. The first quality parameter and the second quality parameter are indicative of a quality of a signal environment in which the electromagnetic signal is propagating. The first decision metric is representative of a value of the first symbol. A third mechanism determines, via the second symbol, whether the primary paging channel should be immediately processed based on a third quality parameter associated with the second symbol and a second decision metric incorporating the second symbol. The third mechanism provides a second indication in response thereto when the first indication indicates that the second symbol should be immediately analyzed. The third quality parameter is indicative of a quality of a signal environment in which the electromagnetic signal is propagating.

Abstract translation: 一种用于基于支持快速寻呼信道和主寻呼信道的无线通信系统中的快速寻呼信道来确定是否应该通过无线通信设备接收和处理主寻呼信道的有效系统。 该系统包括用于接收具有导频信号和快速寻呼信号分量的电磁信号的第一机构。 第二机制基于第一质量参数，第二质量参数和与快速寻呼信号的第一符号相关联的第一决策度量，确定是否应立即分析快速寻呼信道信号的第二符号，并且提供第一 对此的指示。 第一质量参数和第二质量参数表示电磁信号传播的信号环境的质量。 第一决策度量代表第一符号的值。 第三机制基于与第二符号相关联的第三质量参数和包含第二符号的第二决策度量，经由第二符号确定是否应立即处理主寻呼信道。 当第一指示指示应该立即分析第二符号时，第三机制响应于此提供第二指示。 第三质量参数表示电磁信号传播的信号环境的质量。

公开(公告)号：WO2011140396A1

公开(公告)日：2011-11-10

申请号：PCT/US2011035426

申请日：2011-05-05

Applicant: QUALCOMM INC ,  LI WENJUN ,  ABRISHAMKAR FARROKH ,  GUMMADI SRIKANTH

Inventor： LI WENJUN ,  ABRISHAMKAR FARROKH ,  GUMMADI SRIKANTH

IPC: H04L25/02 ,  H04L25/03

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

Abstract: 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.

Abstract translation: 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接收聚合接收信号。基于信道估计，针对每个信道化码来计算组合信道。 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。